Richard Wackerbarth
11 years ago
parent
7592bb1f2f
commit
363d7c505f
@ -0,0 +1,303 @@
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/*
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TwoWire.cpp - TWI/I2C library for Wiring & Arduino
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Copyright (c) 2006 Nicholas Zambetti. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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||||
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
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*/
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extern "C" {
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include "twi.h"
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}
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#include "Wire.h"
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// Initialize Class Variables //////////////////////////////////////////////////
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uint8_t TwoWire::rxBuffer[BUFFER_LENGTH];
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uint8_t TwoWire::rxBufferIndex = 0;
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uint8_t TwoWire::rxBufferLength = 0;
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uint8_t TwoWire::txAddress = 0;
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uint8_t TwoWire::txBuffer[BUFFER_LENGTH];
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uint8_t TwoWire::txBufferIndex = 0;
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uint8_t TwoWire::txBufferLength = 0;
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uint8_t TwoWire::transmitting = 0;
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void (*TwoWire::user_onRequest)(void);
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void (*TwoWire::user_onReceive)(int);
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// Constructors ////////////////////////////////////////////////////////////////
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TwoWire::TwoWire()
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{
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}
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// Public Methods //////////////////////////////////////////////////////////////
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void TwoWire::begin(void)
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{
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rxBufferIndex = 0;
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rxBufferLength = 0;
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txBufferIndex = 0;
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txBufferLength = 0;
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twi_init();
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}
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void TwoWire::begin(uint8_t address)
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{
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twi_setAddress(address);
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twi_attachSlaveTxEvent(onRequestService);
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twi_attachSlaveRxEvent(onReceiveService);
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begin();
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}
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void TwoWire::begin(int address)
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{
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begin((uint8_t)address);
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}
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void TwoWire::setClock(uint32_t frequency)
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{
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TWBR = ((F_CPU / frequency) - 16) / 2;
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}
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uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop)
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{
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// clamp to buffer length
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if(quantity > BUFFER_LENGTH){
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quantity = BUFFER_LENGTH;
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}
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// perform blocking read into buffer
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uint8_t read = twi_readFrom(address, rxBuffer, quantity, sendStop);
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// set rx buffer iterator vars
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rxBufferIndex = 0;
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rxBufferLength = read;
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return read;
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}
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uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity)
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{
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return requestFrom((uint8_t)address, (uint8_t)quantity, (uint8_t)true);
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}
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uint8_t TwoWire::requestFrom(int address, int quantity)
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{
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return requestFrom((uint8_t)address, (uint8_t)quantity, (uint8_t)true);
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}
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uint8_t TwoWire::requestFrom(int address, int quantity, int sendStop)
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{
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return requestFrom((uint8_t)address, (uint8_t)quantity, (uint8_t)sendStop);
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}
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void TwoWire::beginTransmission(uint8_t address)
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{
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// indicate that we are transmitting
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transmitting = 1;
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// set address of targeted slave
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txAddress = address;
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// reset tx buffer iterator vars
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txBufferIndex = 0;
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txBufferLength = 0;
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}
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void TwoWire::beginTransmission(int address)
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{
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beginTransmission((uint8_t)address);
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}
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//
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// Originally, 'endTransmission' was an f(void) function.
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// It has been modified to take one parameter indicating
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// whether or not a STOP should be performed on the bus.
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// Calling endTransmission(false) allows a sketch to
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// perform a repeated start.
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//
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// WARNING: Nothing in the library keeps track of whether
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// the bus tenure has been properly ended with a STOP. It
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// is very possible to leave the bus in a hung state if
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// no call to endTransmission(true) is made. Some I2C
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// devices will behave oddly if they do not see a STOP.
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//
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uint8_t TwoWire::endTransmission(uint8_t sendStop)
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{
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// transmit buffer (blocking)
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int8_t ret = twi_writeTo(txAddress, txBuffer, txBufferLength, 1, sendStop);
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// reset tx buffer iterator vars
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txBufferIndex = 0;
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txBufferLength = 0;
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// indicate that we are done transmitting
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transmitting = 0;
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return ret;
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}
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// This provides backwards compatibility with the original
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// definition, and expected behaviour, of endTransmission
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//
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uint8_t TwoWire::endTransmission(void)
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{
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return endTransmission(true);
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}
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// must be called in:
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// slave tx event callback
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// or after beginTransmission(address)
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size_t TwoWire::write(uint8_t data)
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{
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if(transmitting){
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// in master transmitter mode
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// don't bother if buffer is full
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if(txBufferLength >= BUFFER_LENGTH){
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setWriteError();
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return 0;
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}
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// put byte in tx buffer
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txBuffer[txBufferIndex] = data;
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++txBufferIndex;
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// update amount in buffer
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txBufferLength = txBufferIndex;
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}else{
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// in slave send mode
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// reply to master
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twi_transmit(&data, 1);
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}
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return 1;
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}
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// must be called in:
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// slave tx event callback
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// or after beginTransmission(address)
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size_t TwoWire::write(const uint8_t *data, size_t quantity)
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{
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if(transmitting){
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// in master transmitter mode
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for(size_t i = 0; i < quantity; ++i){
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write(data[i]);
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}
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}else{
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// in slave send mode
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// reply to master
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twi_transmit(data, quantity);
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}
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return quantity;
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}
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// must be called in:
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// slave rx event callback
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// or after requestFrom(address, numBytes)
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int TwoWire::available(void)
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{
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return rxBufferLength - rxBufferIndex;
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}
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// must be called in:
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// slave rx event callback
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// or after requestFrom(address, numBytes)
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int TwoWire::read(void)
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{
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int value = -1;
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// get each successive byte on each call
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if(rxBufferIndex < rxBufferLength){
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value = rxBuffer[rxBufferIndex];
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++rxBufferIndex;
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}
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return value;
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}
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// must be called in:
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// slave rx event callback
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// or after requestFrom(address, numBytes)
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int TwoWire::peek(void)
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{
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int value = -1;
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if(rxBufferIndex < rxBufferLength){
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value = rxBuffer[rxBufferIndex];
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}
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return value;
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}
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void TwoWire::flush(void)
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{
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// XXX: to be implemented.
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}
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// behind the scenes function that is called when data is received
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void TwoWire::onReceiveService(uint8_t* inBytes, int numBytes)
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{
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// don't bother if user hasn't registered a callback
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if(!user_onReceive){
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return;
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}
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// don't bother if rx buffer is in use by a master requestFrom() op
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// i know this drops data, but it allows for slight stupidity
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// meaning, they may not have read all the master requestFrom() data yet
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if(rxBufferIndex < rxBufferLength){
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return;
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}
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// copy twi rx buffer into local read buffer
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// this enables new reads to happen in parallel
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for(uint8_t i = 0; i < numBytes; ++i){
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rxBuffer[i] = inBytes[i];
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}
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// set rx iterator vars
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rxBufferIndex = 0;
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rxBufferLength = numBytes;
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// alert user program
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user_onReceive(numBytes);
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}
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// behind the scenes function that is called when data is requested
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void TwoWire::onRequestService(void)
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{
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// don't bother if user hasn't registered a callback
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if(!user_onRequest){
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return;
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}
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// reset tx buffer iterator vars
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// !!! this will kill any pending pre-master sendTo() activity
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txBufferIndex = 0;
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txBufferLength = 0;
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// alert user program
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user_onRequest();
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}
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// sets function called on slave write
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void TwoWire::onReceive( void (*function)(int) )
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{
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user_onReceive = function;
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}
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// sets function called on slave read
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void TwoWire::onRequest( void (*function)(void) )
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{
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user_onRequest = function;
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}
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// Preinstantiate Objects //////////////////////////////////////////////////////
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TwoWire Wire = TwoWire();
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@ -0,0 +1,80 @@
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/*
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TwoWire.h - TWI/I2C library for Arduino & Wiring
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Copyright (c) 2006 Nicholas Zambetti. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
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*/
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#ifndef TwoWire_h
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#define TwoWire_h
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#include <inttypes.h>
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#include "Stream.h"
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#define BUFFER_LENGTH 32
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class TwoWire : public Stream
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{
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private:
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static uint8_t rxBuffer[];
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static uint8_t rxBufferIndex;
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static uint8_t rxBufferLength;
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static uint8_t txAddress;
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static uint8_t txBuffer[];
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static uint8_t txBufferIndex;
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static uint8_t txBufferLength;
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static uint8_t transmitting;
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static void (*user_onRequest)(void);
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static void (*user_onReceive)(int);
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static void onRequestService(void);
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static void onReceiveService(uint8_t*, int);
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public:
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TwoWire();
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void begin();
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void begin(uint8_t);
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void begin(int);
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void setClock(uint32_t);
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void beginTransmission(uint8_t);
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void beginTransmission(int);
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uint8_t endTransmission(void);
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uint8_t endTransmission(uint8_t);
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uint8_t requestFrom(uint8_t, uint8_t);
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uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
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uint8_t requestFrom(int, int);
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uint8_t requestFrom(int, int, int);
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virtual size_t write(uint8_t);
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virtual size_t write(const uint8_t *, size_t);
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virtual int available(void);
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virtual int read(void);
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virtual int peek(void);
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virtual void flush(void);
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void onReceive( void (*)(int) );
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void onRequest( void (*)(void) );
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inline size_t write(unsigned long n) { return write((uint8_t)n); }
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inline size_t write(long n) { return write((uint8_t)n); }
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inline size_t write(unsigned int n) { return write((uint8_t)n); }
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inline size_t write(int n) { return write((uint8_t)n); }
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using Print::write;
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};
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extern TwoWire Wire;
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#endif
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@ -0,0 +1,87 @@
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// I2C SRF10 or SRF08 Devantech Ultrasonic Ranger Finder
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// by Nicholas Zambetti <http://www.zambetti.com>
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// and James Tichenor <http://www.jamestichenor.net>
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// Demonstrates use of the Wire library reading data from the
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// Devantech Utrasonic Rangers SFR08 and SFR10
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// Created 29 April 2006
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// This example code is in the public domain.
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#include <Wire.h>
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void setup()
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{
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Wire.begin(); // join i2c bus (address optional for master)
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Serial.begin(9600); // start serial communication at 9600bps
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}
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int reading = 0;
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void loop()
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{
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// step 1: instruct sensor to read echoes
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Wire.beginTransmission(112); // transmit to device #112 (0x70)
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// the address specified in the datasheet is 224 (0xE0)
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// but i2c adressing uses the high 7 bits so it's 112
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Wire.write(byte(0x00)); // sets register pointer to the command register (0x00)
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Wire.write(byte(0x50)); // command sensor to measure in "inches" (0x50)
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// use 0x51 for centimeters
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// use 0x52 for ping microseconds
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Wire.endTransmission(); // stop transmitting
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// step 2: wait for readings to happen
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delay(70); // datasheet suggests at least 65 milliseconds
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// step 3: instruct sensor to return a particular echo reading
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Wire.beginTransmission(112); // transmit to device #112
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Wire.write(byte(0x02)); // sets register pointer to echo #1 register (0x02)
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Wire.endTransmission(); // stop transmitting
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// step 4: request reading from sensor
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Wire.requestFrom(112, 2); // request 2 bytes from slave device #112
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// step 5: receive reading from sensor
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if (2 <= Wire.available()) // if two bytes were received
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{
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reading = Wire.read(); // receive high byte (overwrites previous reading)
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reading = reading << 8; // shift high byte to be high 8 bits
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reading |= Wire.read(); // receive low byte as lower 8 bits
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Serial.println(reading); // print the reading
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}
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delay(250); // wait a bit since people have to read the output :)
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}
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/*
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// The following code changes the address of a Devantech Ultrasonic Range Finder (SRF10 or SRF08)
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// usage: changeAddress(0x70, 0xE6);
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void changeAddress(byte oldAddress, byte newAddress)
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{
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Wire.beginTransmission(oldAddress);
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Wire.write(byte(0x00));
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Wire.write(byte(0xA0));
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Wire.endTransmission();
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Wire.beginTransmission(oldAddress);
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Wire.write(byte(0x00));
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Wire.write(byte(0xAA));
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Wire.endTransmission();
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Wire.beginTransmission(oldAddress);
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Wire.write(byte(0x00));
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Wire.write(byte(0xA5));
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Wire.endTransmission();
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Wire.beginTransmission(oldAddress);
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Wire.write(byte(0x00));
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Wire.write(newAddress);
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Wire.endTransmission();
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}
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*/
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@ -0,0 +1,39 @@
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// I2C Digital Potentiometer
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// by Nicholas Zambetti <http://www.zambetti.com>
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// and Shawn Bonkowski <http://people.interaction-ivrea.it/s.bonkowski/>
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// Demonstrates use of the Wire library
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// Controls AD5171 digital potentiometer via I2C/TWI
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// Created 31 March 2006
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// This example code is in the public domain.
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// This example code is in the public domain.
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#include <Wire.h>
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void setup()
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{
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Wire.begin(); // join i2c bus (address optional for master)
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}
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byte val = 0;
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void loop()
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{
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Wire.beginTransmission(44); // transmit to device #44 (0x2c)
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// device address is specified in datasheet
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Wire.write(byte(0x00)); // sends instruction byte
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Wire.write(val); // sends potentiometer value byte
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Wire.endTransmission(); // stop transmitting
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val++; // increment value
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if (val == 64) // if reached 64th position (max)
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{
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val = 0; // start over from lowest value
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}
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delay(500);
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}
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@ -0,0 +1,32 @@
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// Wire Master Reader
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// by Nicholas Zambetti <http://www.zambetti.com>
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// Demonstrates use of the Wire library
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// Reads data from an I2C/TWI slave device
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// Refer to the "Wire Slave Sender" example for use with this
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// Created 29 March 2006
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// This example code is in the public domain.
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|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(); // join i2c bus (address optional for master)
|
||||
Serial.begin(9600); // start serial for output
|
||||
}
|
||||
|
||||
void loop()
|
||||
{
|
||||
Wire.requestFrom(2, 6); // request 6 bytes from slave device #2
|
||||
|
||||
while (Wire.available()) // slave may send less than requested
|
||||
{
|
||||
char c = Wire.read(); // receive a byte as character
|
||||
Serial.print(c); // print the character
|
||||
}
|
||||
|
||||
delay(500);
|
||||
}
|
||||
@ -0,0 +1,31 @@
|
||||
// Wire Master Writer
|
||||
// by Nicholas Zambetti <http://www.zambetti.com>
|
||||
|
||||
// Demonstrates use of the Wire library
|
||||
// Writes data to an I2C/TWI slave device
|
||||
// Refer to the "Wire Slave Receiver" example for use with this
|
||||
|
||||
// Created 29 March 2006
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(); // join i2c bus (address optional for master)
|
||||
}
|
||||
|
||||
byte x = 0;
|
||||
|
||||
void loop()
|
||||
{
|
||||
Wire.beginTransmission(4); // transmit to device #4
|
||||
Wire.write("x is "); // sends five bytes
|
||||
Wire.write(x); // sends one byte
|
||||
Wire.endTransmission(); // stop transmitting
|
||||
|
||||
x++;
|
||||
delay(500);
|
||||
}
|
||||
@ -0,0 +1,38 @@
|
||||
// Wire Slave Receiver
|
||||
// by Nicholas Zambetti <http://www.zambetti.com>
|
||||
|
||||
// Demonstrates use of the Wire library
|
||||
// Receives data as an I2C/TWI slave device
|
||||
// Refer to the "Wire Master Writer" example for use with this
|
||||
|
||||
// Created 29 March 2006
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(4); // join i2c bus with address #4
|
||||
Wire.onReceive(receiveEvent); // register event
|
||||
Serial.begin(9600); // start serial for output
|
||||
}
|
||||
|
||||
void loop()
|
||||
{
|
||||
delay(100);
|
||||
}
|
||||
|
||||
// function that executes whenever data is received from master
|
||||
// this function is registered as an event, see setup()
|
||||
void receiveEvent(int howMany)
|
||||
{
|
||||
while (1 < Wire.available()) // loop through all but the last
|
||||
{
|
||||
char c = Wire.read(); // receive byte as a character
|
||||
Serial.print(c); // print the character
|
||||
}
|
||||
int x = Wire.read(); // receive byte as an integer
|
||||
Serial.println(x); // print the integer
|
||||
}
|
||||
@ -0,0 +1,32 @@
|
||||
// Wire Slave Sender
|
||||
// by Nicholas Zambetti <http://www.zambetti.com>
|
||||
|
||||
// Demonstrates use of the Wire library
|
||||
// Sends data as an I2C/TWI slave device
|
||||
// Refer to the "Wire Master Reader" example for use with this
|
||||
|
||||
// Created 29 March 2006
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(2); // join i2c bus with address #2
|
||||
Wire.onRequest(requestEvent); // register event
|
||||
}
|
||||
|
||||
void loop()
|
||||
{
|
||||
delay(100);
|
||||
}
|
||||
|
||||
// function that executes whenever data is requested by master
|
||||
// this function is registered as an event, see setup()
|
||||
void requestEvent()
|
||||
{
|
||||
Wire.write("hello "); // respond with message of 6 bytes
|
||||
// as expected by master
|
||||
}
|
||||
@ -0,0 +1,32 @@
|
||||
#######################################
|
||||
# Syntax Coloring Map For Wire
|
||||
#######################################
|
||||
|
||||
#######################################
|
||||
# Datatypes (KEYWORD1)
|
||||
#######################################
|
||||
|
||||
#######################################
|
||||
# Methods and Functions (KEYWORD2)
|
||||
#######################################
|
||||
|
||||
begin KEYWORD2
|
||||
setClock KEYWORD2
|
||||
beginTransmission KEYWORD2
|
||||
endTransmission KEYWORD2
|
||||
requestFrom KEYWORD2
|
||||
send KEYWORD2
|
||||
receive KEYWORD2
|
||||
onReceive KEYWORD2
|
||||
onRequest KEYWORD2
|
||||
|
||||
#######################################
|
||||
# Instances (KEYWORD2)
|
||||
#######################################
|
||||
|
||||
Wire KEYWORD2
|
||||
|
||||
#######################################
|
||||
# Constants (LITERAL1)
|
||||
#######################################
|
||||
|
||||
@ -0,0 +1,8 @@
|
||||
name=Wire
|
||||
version=1.0
|
||||
author=Arduino
|
||||
maintainer=Arduino <info@arduino.cc>
|
||||
sentence=Allows the communication between devices or sensors connected via Two Wire Interface Bus. For all Arduino boards, BUT Arduino DUE.
|
||||
paragraph=
|
||||
url=http://arduino.cc/en/Reference/Wire
|
||||
architectures=avr
|
||||
@ -0,0 +1,527 @@
|
||||
/*
|
||||
twi.c - TWI/I2C library for Wiring & Arduino
|
||||
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||
|
||||
This library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
This library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with this library; if not, write to the Free Software
|
||||
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
|
||||
Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
|
||||
*/
|
||||
|
||||
#include <math.h>
|
||||
#include <stdlib.h>
|
||||
#include <inttypes.h>
|
||||
#include <avr/io.h>
|
||||
#include <avr/interrupt.h>
|
||||
#include <compat/twi.h>
|
||||
#include "Arduino.h" // for digitalWrite
|
||||
|
||||
#ifndef cbi
|
||||
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
|
||||
#endif
|
||||
|
||||
#ifndef sbi
|
||||
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
|
||||
#endif
|
||||
|
||||
#include "pins_arduino.h"
|
||||
#include "twi.h"
|
||||
|
||||
static volatile uint8_t twi_state;
|
||||
static volatile uint8_t twi_slarw;
|
||||
static volatile uint8_t twi_sendStop; // should the transaction end with a stop
|
||||
static volatile uint8_t twi_inRepStart; // in the middle of a repeated start
|
||||
|
||||
static void (*twi_onSlaveTransmit)(void);
|
||||
static void (*twi_onSlaveReceive)(uint8_t*, int);
|
||||
|
||||
static uint8_t twi_masterBuffer[TWI_BUFFER_LENGTH];
|
||||
static volatile uint8_t twi_masterBufferIndex;
|
||||
static volatile uint8_t twi_masterBufferLength;
|
||||
|
||||
static uint8_t twi_txBuffer[TWI_BUFFER_LENGTH];
|
||||
static volatile uint8_t twi_txBufferIndex;
|
||||
static volatile uint8_t twi_txBufferLength;
|
||||
|
||||
static uint8_t twi_rxBuffer[TWI_BUFFER_LENGTH];
|
||||
static volatile uint8_t twi_rxBufferIndex;
|
||||
|
||||
static volatile uint8_t twi_error;
|
||||
|
||||
/*
|
||||
* Function twi_init
|
||||
* Desc readys twi pins and sets twi bitrate
|
||||
* Input none
|
||||
* Output none
|
||||
*/
|
||||
void twi_init(void)
|
||||
{
|
||||
// initialize state
|
||||
twi_state = TWI_READY;
|
||||
twi_sendStop = true; // default value
|
||||
twi_inRepStart = false;
|
||||
|
||||
// activate internal pullups for twi.
|
||||
digitalWrite(SDA, 1);
|
||||
digitalWrite(SCL, 1);
|
||||
|
||||
// initialize twi prescaler and bit rate
|
||||
cbi(TWSR, TWPS0);
|
||||
cbi(TWSR, TWPS1);
|
||||
TWBR = ((F_CPU / TWI_FREQ) - 16) / 2;
|
||||
|
||||
/* twi bit rate formula from atmega128 manual pg 204
|
||||
SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR))
|
||||
note: TWBR should be 10 or higher for master mode
|
||||
It is 72 for a 16mhz Wiring board with 100kHz TWI */
|
||||
|
||||
// enable twi module, acks, and twi interrupt
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA);
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_slaveInit
|
||||
* Desc sets slave address and enables interrupt
|
||||
* Input none
|
||||
* Output none
|
||||
*/
|
||||
void twi_setAddress(uint8_t address)
|
||||
{
|
||||
// set twi slave address (skip over TWGCE bit)
|
||||
TWAR = address << 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_readFrom
|
||||
* Desc attempts to become twi bus master and read a
|
||||
* series of bytes from a device on the bus
|
||||
* Input address: 7bit i2c device address
|
||||
* data: pointer to byte array
|
||||
* length: number of bytes to read into array
|
||||
* sendStop: Boolean indicating whether to send a stop at the end
|
||||
* Output number of bytes read
|
||||
*/
|
||||
uint8_t twi_readFrom(uint8_t address, uint8_t* data, uint8_t length, uint8_t sendStop)
|
||||
{
|
||||
uint8_t i;
|
||||
|
||||
// ensure data will fit into buffer
|
||||
if(TWI_BUFFER_LENGTH < length){
|
||||
return 0;
|
||||
}
|
||||
|
||||
// wait until twi is ready, become master receiver
|
||||
while(TWI_READY != twi_state){
|
||||
continue;
|
||||
}
|
||||
twi_state = TWI_MRX;
|
||||
twi_sendStop = sendStop;
|
||||
// reset error state (0xFF.. no error occured)
|
||||
twi_error = 0xFF;
|
||||
|
||||
// initialize buffer iteration vars
|
||||
twi_masterBufferIndex = 0;
|
||||
twi_masterBufferLength = length-1; // This is not intuitive, read on...
|
||||
// On receive, the previously configured ACK/NACK setting is transmitted in
|
||||
// response to the received byte before the interrupt is signalled.
|
||||
// Therefor we must actually set NACK when the _next_ to last byte is
|
||||
// received, causing that NACK to be sent in response to receiving the last
|
||||
// expected byte of data.
|
||||
|
||||
// build sla+w, slave device address + w bit
|
||||
twi_slarw = TW_READ;
|
||||
twi_slarw |= address << 1;
|
||||
|
||||
if (true == twi_inRepStart) {
|
||||
// if we're in the repeated start state, then we've already sent the start,
|
||||
// (@@@ we hope), and the TWI statemachine is just waiting for the address byte.
|
||||
// We need to remove ourselves from the repeated start state before we enable interrupts,
|
||||
// since the ISR is ASYNC, and we could get confused if we hit the ISR before cleaning
|
||||
// up. Also, don't enable the START interrupt. There may be one pending from the
|
||||
// repeated start that we sent outselves, and that would really confuse things.
|
||||
twi_inRepStart = false; // remember, we're dealing with an ASYNC ISR
|
||||
TWDR = twi_slarw;
|
||||
TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE); // enable INTs, but not START
|
||||
}
|
||||
else
|
||||
// send start condition
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTA);
|
||||
|
||||
// wait for read operation to complete
|
||||
while(TWI_MRX == twi_state){
|
||||
continue;
|
||||
}
|
||||
|
||||
if (twi_masterBufferIndex < length)
|
||||
length = twi_masterBufferIndex;
|
||||
|
||||
// copy twi buffer to data
|
||||
for(i = 0; i < length; ++i){
|
||||
data[i] = twi_masterBuffer[i];
|
||||
}
|
||||
|
||||
return length;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_writeTo
|
||||
* Desc attempts to become twi bus master and write a
|
||||
* series of bytes to a device on the bus
|
||||
* Input address: 7bit i2c device address
|
||||
* data: pointer to byte array
|
||||
* length: number of bytes in array
|
||||
* wait: boolean indicating to wait for write or not
|
||||
* sendStop: boolean indicating whether or not to send a stop at the end
|
||||
* Output 0 .. success
|
||||
* 1 .. length to long for buffer
|
||||
* 2 .. address send, NACK received
|
||||
* 3 .. data send, NACK received
|
||||
* 4 .. other twi error (lost bus arbitration, bus error, ..)
|
||||
*/
|
||||
uint8_t twi_writeTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait, uint8_t sendStop)
|
||||
{
|
||||
uint8_t i;
|
||||
|
||||
// ensure data will fit into buffer
|
||||
if(TWI_BUFFER_LENGTH < length){
|
||||
return 1;
|
||||
}
|
||||
|
||||
// wait until twi is ready, become master transmitter
|
||||
while(TWI_READY != twi_state){
|
||||
continue;
|
||||
}
|
||||
twi_state = TWI_MTX;
|
||||
twi_sendStop = sendStop;
|
||||
// reset error state (0xFF.. no error occured)
|
||||
twi_error = 0xFF;
|
||||
|
||||
// initialize buffer iteration vars
|
||||
twi_masterBufferIndex = 0;
|
||||
twi_masterBufferLength = length;
|
||||
|
||||
// copy data to twi buffer
|
||||
for(i = 0; i < length; ++i){
|
||||
twi_masterBuffer[i] = data[i];
|
||||
}
|
||||
|
||||
// build sla+w, slave device address + w bit
|
||||
twi_slarw = TW_WRITE;
|
||||
twi_slarw |= address << 1;
|
||||
|
||||
// if we're in a repeated start, then we've already sent the START
|
||||
// in the ISR. Don't do it again.
|
||||
//
|
||||
if (true == twi_inRepStart) {
|
||||
// if we're in the repeated start state, then we've already sent the start,
|
||||
// (@@@ we hope), and the TWI statemachine is just waiting for the address byte.
|
||||
// We need to remove ourselves from the repeated start state before we enable interrupts,
|
||||
// since the ISR is ASYNC, and we could get confused if we hit the ISR before cleaning
|
||||
// up. Also, don't enable the START interrupt. There may be one pending from the
|
||||
// repeated start that we sent outselves, and that would really confuse things.
|
||||
twi_inRepStart = false; // remember, we're dealing with an ASYNC ISR
|
||||
TWDR = twi_slarw;
|
||||
TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE); // enable INTs, but not START
|
||||
}
|
||||
else
|
||||
// send start condition
|
||||
TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE) | _BV(TWSTA); // enable INTs
|
||||
|
||||
// wait for write operation to complete
|
||||
while(wait && (TWI_MTX == twi_state)){
|
||||
continue;
|
||||
}
|
||||
|
||||
if (twi_error == 0xFF)
|
||||
return 0; // success
|
||||
else if (twi_error == TW_MT_SLA_NACK)
|
||||
return 2; // error: address send, nack received
|
||||
else if (twi_error == TW_MT_DATA_NACK)
|
||||
return 3; // error: data send, nack received
|
||||
else
|
||||
return 4; // other twi error
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_transmit
|
||||
* Desc fills slave tx buffer with data
|
||||
* must be called in slave tx event callback
|
||||
* Input data: pointer to byte array
|
||||
* length: number of bytes in array
|
||||
* Output 1 length too long for buffer
|
||||
* 2 not slave transmitter
|
||||
* 0 ok
|
||||
*/
|
||||
uint8_t twi_transmit(const uint8_t* data, uint8_t length)
|
||||
{
|
||||
uint8_t i;
|
||||
|
||||
// ensure data will fit into buffer
|
||||
if(TWI_BUFFER_LENGTH < length){
|
||||
return 1;
|
||||
}
|
||||
|
||||
// ensure we are currently a slave transmitter
|
||||
if(TWI_STX != twi_state){
|
||||
return 2;
|
||||
}
|
||||
|
||||
// set length and copy data into tx buffer
|
||||
twi_txBufferLength = length;
|
||||
for(i = 0; i < length; ++i){
|
||||
twi_txBuffer[i] = data[i];
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_attachSlaveRxEvent
|
||||
* Desc sets function called before a slave read operation
|
||||
* Input function: callback function to use
|
||||
* Output none
|
||||
*/
|
||||
void twi_attachSlaveRxEvent( void (*function)(uint8_t*, int) )
|
||||
{
|
||||
twi_onSlaveReceive = function;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_attachSlaveTxEvent
|
||||
* Desc sets function called before a slave write operation
|
||||
* Input function: callback function to use
|
||||
* Output none
|
||||
*/
|
||||
void twi_attachSlaveTxEvent( void (*function)(void) )
|
||||
{
|
||||
twi_onSlaveTransmit = function;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_reply
|
||||
* Desc sends byte or readys receive line
|
||||
* Input ack: byte indicating to ack or to nack
|
||||
* Output none
|
||||
*/
|
||||
void twi_reply(uint8_t ack)
|
||||
{
|
||||
// transmit master read ready signal, with or without ack
|
||||
if(ack){
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWINT) | _BV(TWEA);
|
||||
}else{
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWINT);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_stop
|
||||
* Desc relinquishes bus master status
|
||||
* Input none
|
||||
* Output none
|
||||
*/
|
||||
void twi_stop(void)
|
||||
{
|
||||
// send stop condition
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTO);
|
||||
|
||||
// wait for stop condition to be exectued on bus
|
||||
// TWINT is not set after a stop condition!
|
||||
while(TWCR & _BV(TWSTO)){
|
||||
continue;
|
||||
}
|
||||
|
||||
// update twi state
|
||||
twi_state = TWI_READY;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_releaseBus
|
||||
* Desc releases bus control
|
||||
* Input none
|
||||
* Output none
|
||||
*/
|
||||
void twi_releaseBus(void)
|
||||
{
|
||||
// release bus
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT);
|
||||
|
||||
// update twi state
|
||||
twi_state = TWI_READY;
|
||||
}
|
||||
|
||||
ISR(TWI_vect)
|
||||
{
|
||||
switch(TW_STATUS){
|
||||
// All Master
|
||||
case TW_START: // sent start condition
|
||||
case TW_REP_START: // sent repeated start condition
|
||||
// copy device address and r/w bit to output register and ack
|
||||
TWDR = twi_slarw;
|
||||
twi_reply(1);
|
||||
break;
|
||||
|
||||
// Master Transmitter
|
||||
case TW_MT_SLA_ACK: // slave receiver acked address
|
||||
case TW_MT_DATA_ACK: // slave receiver acked data
|
||||
// if there is data to send, send it, otherwise stop
|
||||
if(twi_masterBufferIndex < twi_masterBufferLength){
|
||||
// copy data to output register and ack
|
||||
TWDR = twi_masterBuffer[twi_masterBufferIndex++];
|
||||
twi_reply(1);
|
||||
}else{
|
||||
if (twi_sendStop)
|
||||
twi_stop();
|
||||
else {
|
||||
twi_inRepStart = true; // we're gonna send the START
|
||||
// don't enable the interrupt. We'll generate the start, but we
|
||||
// avoid handling the interrupt until we're in the next transaction,
|
||||
// at the point where we would normally issue the start.
|
||||
TWCR = _BV(TWINT) | _BV(TWSTA)| _BV(TWEN) ;
|
||||
twi_state = TWI_READY;
|
||||
}
|
||||
}
|
||||
break;
|
||||
case TW_MT_SLA_NACK: // address sent, nack received
|
||||
twi_error = TW_MT_SLA_NACK;
|
||||
twi_stop();
|
||||
break;
|
||||
case TW_MT_DATA_NACK: // data sent, nack received
|
||||
twi_error = TW_MT_DATA_NACK;
|
||||
twi_stop();
|
||||
break;
|
||||
case TW_MT_ARB_LOST: // lost bus arbitration
|
||||
twi_error = TW_MT_ARB_LOST;
|
||||
twi_releaseBus();
|
||||
break;
|
||||
|
||||
// Master Receiver
|
||||
case TW_MR_DATA_ACK: // data received, ack sent
|
||||
// put byte into buffer
|
||||
twi_masterBuffer[twi_masterBufferIndex++] = TWDR;
|
||||
case TW_MR_SLA_ACK: // address sent, ack received
|
||||
// ack if more bytes are expected, otherwise nack
|
||||
if(twi_masterBufferIndex < twi_masterBufferLength){
|
||||
twi_reply(1);
|
||||
}else{
|
||||
twi_reply(0);
|
||||
}
|
||||
break;
|
||||
case TW_MR_DATA_NACK: // data received, nack sent
|
||||
// put final byte into buffer
|
||||
twi_masterBuffer[twi_masterBufferIndex++] = TWDR;
|
||||
if (twi_sendStop)
|
||||
twi_stop();
|
||||
else {
|
||||
twi_inRepStart = true; // we're gonna send the START
|
||||
// don't enable the interrupt. We'll generate the start, but we
|
||||
// avoid handling the interrupt until we're in the next transaction,
|
||||
// at the point where we would normally issue the start.
|
||||
TWCR = _BV(TWINT) | _BV(TWSTA)| _BV(TWEN) ;
|
||||
twi_state = TWI_READY;
|
||||
}
|
||||
break;
|
||||
case TW_MR_SLA_NACK: // address sent, nack received
|
||||
twi_stop();
|
||||
break;
|
||||
// TW_MR_ARB_LOST handled by TW_MT_ARB_LOST case
|
||||
|
||||
// Slave Receiver
|
||||
case TW_SR_SLA_ACK: // addressed, returned ack
|
||||
case TW_SR_GCALL_ACK: // addressed generally, returned ack
|
||||
case TW_SR_ARB_LOST_SLA_ACK: // lost arbitration, returned ack
|
||||
case TW_SR_ARB_LOST_GCALL_ACK: // lost arbitration, returned ack
|
||||
// enter slave receiver mode
|
||||
twi_state = TWI_SRX;
|
||||
// indicate that rx buffer can be overwritten and ack
|
||||
twi_rxBufferIndex = 0;
|
||||
twi_reply(1);
|
||||
break;
|
||||
case TW_SR_DATA_ACK: // data received, returned ack
|
||||
case TW_SR_GCALL_DATA_ACK: // data received generally, returned ack
|
||||
// if there is still room in the rx buffer
|
||||
if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){
|
||||
// put byte in buffer and ack
|
||||
twi_rxBuffer[twi_rxBufferIndex++] = TWDR;
|
||||
twi_reply(1);
|
||||
}else{
|
||||
// otherwise nack
|
||||
twi_reply(0);
|
||||
}
|
||||
break;
|
||||
case TW_SR_STOP: // stop or repeated start condition received
|
||||
// put a null char after data if there's room
|
||||
if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){
|
||||
twi_rxBuffer[twi_rxBufferIndex] = '\0';
|
||||
}
|
||||
// sends ack and stops interface for clock stretching
|
||||
twi_stop();
|
||||
// callback to user defined callback
|
||||
twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex);
|
||||
// since we submit rx buffer to "wire" library, we can reset it
|
||||
twi_rxBufferIndex = 0;
|
||||
// ack future responses and leave slave receiver state
|
||||
twi_releaseBus();
|
||||
break;
|
||||
case TW_SR_DATA_NACK: // data received, returned nack
|
||||
case TW_SR_GCALL_DATA_NACK: // data received generally, returned nack
|
||||
// nack back at master
|
||||
twi_reply(0);
|
||||
break;
|
||||
|
||||
// Slave Transmitter
|
||||
case TW_ST_SLA_ACK: // addressed, returned ack
|
||||
case TW_ST_ARB_LOST_SLA_ACK: // arbitration lost, returned ack
|
||||
// enter slave transmitter mode
|
||||
twi_state = TWI_STX;
|
||||
// ready the tx buffer index for iteration
|
||||
twi_txBufferIndex = 0;
|
||||
// set tx buffer length to be zero, to verify if user changes it
|
||||
twi_txBufferLength = 0;
|
||||
// request for txBuffer to be filled and length to be set
|
||||
// note: user must call twi_transmit(bytes, length) to do this
|
||||
twi_onSlaveTransmit();
|
||||
// if they didn't change buffer & length, initialize it
|
||||
if(0 == twi_txBufferLength){
|
||||
twi_txBufferLength = 1;
|
||||
twi_txBuffer[0] = 0x00;
|
||||
}
|
||||
// transmit first byte from buffer, fall
|
||||
case TW_ST_DATA_ACK: // byte sent, ack returned
|
||||
// copy data to output register
|
||||
TWDR = twi_txBuffer[twi_txBufferIndex++];
|
||||
// if there is more to send, ack, otherwise nack
|
||||
if(twi_txBufferIndex < twi_txBufferLength){
|
||||
twi_reply(1);
|
||||
}else{
|
||||
twi_reply(0);
|
||||
}
|
||||
break;
|
||||
case TW_ST_DATA_NACK: // received nack, we are done
|
||||
case TW_ST_LAST_DATA: // received ack, but we are done already!
|
||||
// ack future responses
|
||||
twi_reply(1);
|
||||
// leave slave receiver state
|
||||
twi_state = TWI_READY;
|
||||
break;
|
||||
|
||||
// All
|
||||
case TW_NO_INFO: // no state information
|
||||
break;
|
||||
case TW_BUS_ERROR: // bus error, illegal stop/start
|
||||
twi_error = TW_BUS_ERROR;
|
||||
twi_stop();
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
@ -0,0 +1,53 @@
|
||||
/*
|
||||
twi.h - TWI/I2C library for Wiring & Arduino
|
||||
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||
|
||||
This library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
This library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with this library; if not, write to the Free Software
|
||||
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*/
|
||||
|
||||
#ifndef twi_h
|
||||
#define twi_h
|
||||
|
||||
#include <inttypes.h>
|
||||
|
||||
//#define ATMEGA8
|
||||
|
||||
#ifndef TWI_FREQ
|
||||
#define TWI_FREQ 100000L
|
||||
#endif
|
||||
|
||||
#ifndef TWI_BUFFER_LENGTH
|
||||
#define TWI_BUFFER_LENGTH 32
|
||||
#endif
|
||||
|
||||
#define TWI_READY 0
|
||||
#define TWI_MRX 1
|
||||
#define TWI_MTX 2
|
||||
#define TWI_SRX 3
|
||||
#define TWI_STX 4
|
||||
|
||||
void twi_init(void);
|
||||
void twi_setAddress(uint8_t);
|
||||
uint8_t twi_readFrom(uint8_t, uint8_t*, uint8_t, uint8_t);
|
||||
uint8_t twi_writeTo(uint8_t, uint8_t*, uint8_t, uint8_t, uint8_t);
|
||||
uint8_t twi_transmit(const uint8_t*, uint8_t);
|
||||
void twi_attachSlaveRxEvent( void (*)(uint8_t*, int) );
|
||||
void twi_attachSlaveTxEvent( void (*)(void) );
|
||||
void twi_reply(uint8_t);
|
||||
void twi_stop(void);
|
||||
void twi_releaseBus(void);
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in new issue