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119 lines
2.8 KiB
119 lines
2.8 KiB
/*
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* Marlin 3D Printer Firmware
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* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "Marlin.h"
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#if ENABLED(EXPERIMENTAL_I2CBUS)
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#include "twibus.h"
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#include <Wire.h>
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TWIBus::TWIBus() {
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Wire.begin(); // We use no address so we will join the BUS as the master
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this->reset();
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}
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void TWIBus::reset() {
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this->addr = 0;
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this->buffer_s = 0;
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this->buffer[0] = 0x00;
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}
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void TWIBus::address(uint8_t addr) {
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this->addr = addr;
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#if ENABLED(DEBUG_TWIBUS)
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debug(PSTR("sendto"), this->addr);
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#endif
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}
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void TWIBus::addbyte(char c) {
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if (buffer_s >= sizeof(this->buffer)) return;
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this->buffer[this->buffer_s++] = c;
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#if ENABLED(DEBUG_TWIBUS)
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debug(PSTR("addbyte"), this->buffer[this->buffer_s - 1]);
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#endif
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}
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void TWIBus::send() {
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if (!this->addr) return;
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#if ENABLED(DEBUG_TWIBUS)
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debug(PSTR("send()"));
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#endif
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Wire.beginTransmission(this->addr);
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Wire.write(this->buffer, this->buffer_s);
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Wire.endTransmission();
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// Reset the buffer after sending the data
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this->reset();
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}
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void TWIBus::reqbytes(uint8_t bytes) {
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if (!this->addr) return;
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#if ENABLED(DEBUG_TWIBUS)
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debug(PSTR("reqbytes"), bytes);
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#endif
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millis_t t = millis() + this->timeout;
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Wire.requestFrom(this->addr, bytes);
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// requestFrom() is a blocking function
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while (Wire.available() < bytes) {
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if (ELAPSED(millis(), t)) break;
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else continue;
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}
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SERIAL_ECHO_START;
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SERIAL_ECHOPAIR("i2c-reply: from:", this->addr);
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SERIAL_ECHOPAIR(" bytes:", Wire.available());
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SERIAL_ECHOPGM (" data:");
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// Protect against buffer overflows if the number of received bytes
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// is less than the number of requested bytes
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uint8_t wba = Wire.available();
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for (int i = 0; i < wba; i++) SERIAL_CHAR(Wire.read());
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SERIAL_EOL;
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// Reset the buffer after sending the data
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this->reset();
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}
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#if ENABLED(DEBUG_TWIBUS)
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void TWIBus::debug(const char func[], int32_t val/*=-1*/) {
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if (DEBUGGING(INFO)) {
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SERIAL_ECHOPGM("TWIBus::");
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serialprintPGM(func);
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if (val >= 0) SERIAL_ECHOPAIR(": ", val);
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SERIAL_EOL;
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}
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}
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#endif
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#endif //EXPERIMENTAL_I2CBUS
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