You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
235 lines
8.1 KiB
235 lines
8.1 KiB
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2010.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.fourwalledcubicle.com
|
|
*/
|
|
|
|
/*
|
|
Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
|
|
|
|
Permission to use, copy, modify, distribute, and sell this
|
|
software and its documentation for any purpose is hereby granted
|
|
without fee, provided that the above copyright notice appear in
|
|
all copies and that both that the copyright notice and this
|
|
permission notice and warranty disclaimer appear in supporting
|
|
documentation, and that the name of the author not be used in
|
|
advertising or publicity pertaining to distribution of the
|
|
software without specific, written prior permission.
|
|
|
|
The author disclaim all warranties with regard to this
|
|
software, including all implied warranties of merchantability
|
|
and fitness. In no event shall the author be liable for any
|
|
special, indirect or consequential damages or any damages
|
|
whatsoever resulting from loss of use, data or profits, whether
|
|
in an action of contract, negligence or other tortious action,
|
|
arising out of or in connection with the use or performance of
|
|
this software.
|
|
*/
|
|
|
|
/** \file
|
|
*
|
|
* Target-related functions for the TINY target's NVM module.
|
|
*/
|
|
|
|
#define INCLUDE_FROM_TINYNVM_C
|
|
#include "TINYNVM.h"
|
|
|
|
#if defined(ENABLE_XPROG_PROTOCOL) || defined(__DOXYGEN__)
|
|
|
|
/** Sends the given pointer address to the target's TPI pointer register */
|
|
static void TINYNVM_SendPointerAddress(const uint16_t AbsoluteAddress)
|
|
{
|
|
/* Send the given 16-bit address to the target, LSB first */
|
|
XPROGTarget_SendByte(TPI_CMD_SSTPR | 0);
|
|
XPROGTarget_SendByte(((uint8_t*)&AbsoluteAddress)[0]);
|
|
XPROGTarget_SendByte(TPI_CMD_SSTPR | 1);
|
|
XPROGTarget_SendByte(((uint8_t*)&AbsoluteAddress)[1]);
|
|
}
|
|
|
|
/** Sends a SIN command to the target with the specified I/O address, ready for the data byte to be written.
|
|
*
|
|
* \param[in] Address 6-bit I/O address to write to in the target's I/O memory space
|
|
*/
|
|
static void TINYNVM_SendReadNVMRegister(const uint8_t Address)
|
|
{
|
|
/* The TPI command for reading from the I/O space uses strange addressing, where the I/O address's upper
|
|
* two bits of the 6-bit address are shifted left once */
|
|
XPROGTarget_SendByte(TPI_CMD_SIN | ((Address & 0x30) << 1) | (Address & 0x0F));
|
|
}
|
|
|
|
/** Sends a SOUT command to the target with the specified I/O address, ready for the data byte to be read.
|
|
*
|
|
* \param[in] Address 6-bit I/O address to read from in the target's I/O memory space
|
|
*/
|
|
static void TINYNVM_SendWriteNVMRegister(const uint8_t Address)
|
|
{
|
|
/* The TPI command for reading from the I/O space uses strange addressing, where the I/O address's upper
|
|
* two bits of the 6-bit address are shifted left once */
|
|
XPROGTarget_SendByte(TPI_CMD_SOUT | ((Address & 0x30) << 1) | (Address & 0x0F));
|
|
}
|
|
|
|
/** Busy-waits while the NVM controller is busy performing a NVM operation, such as a FLASH page read.
|
|
*
|
|
* \return Boolean true if the NVM controller became ready within the timeout period, false otherwise
|
|
*/
|
|
bool TINYNVM_WaitWhileNVMBusBusy(void)
|
|
{
|
|
/* Poll the STATUS register to check to see if NVM access has been enabled */
|
|
for (;;)
|
|
{
|
|
/* Send the SLDCS command to read the TPI STATUS register to see the NVM bus is active */
|
|
XPROGTarget_SendByte(TPI_CMD_SLDCS | TPI_STATUS_REG);
|
|
|
|
uint8_t StatusRegister = XPROGTarget_ReceiveByte();
|
|
|
|
/* We might have timed out waiting for the status register read response, check here */
|
|
if (!(TimeoutMSRemaining))
|
|
return false;
|
|
|
|
/* Check the status register read response to see if the NVM bus is enabled */
|
|
if (StatusRegister & TPI_STATUS_NVM)
|
|
{
|
|
TimeoutMSRemaining = COMMAND_TIMEOUT_MS;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Waits while the target's NVM controller is busy performing an operation, exiting if the
|
|
* timeout period expires.
|
|
*
|
|
* \return Boolean true if the NVM controller became ready within the timeout period, false otherwise
|
|
*/
|
|
bool TINYNVM_WaitWhileNVMControllerBusy(void)
|
|
{
|
|
/* Poll the STATUS register to check to see if NVM access has been enabled */
|
|
for (;;)
|
|
{
|
|
/* Send the SIN command to read the TPI STATUS register to see the NVM bus is busy */
|
|
TINYNVM_SendReadNVMRegister(XPROG_Param_NVMCSRRegAddr);
|
|
|
|
uint8_t StatusRegister = XPROGTarget_ReceiveByte();
|
|
|
|
/* We might have timed out waiting for the status register read response, check here */
|
|
if (!(TimeoutMSRemaining))
|
|
return false;
|
|
|
|
/* Check to see if the BUSY flag is still set */
|
|
if (!(StatusRegister & (1 << 7)))
|
|
{
|
|
TimeoutMSRemaining = COMMAND_TIMEOUT_MS;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
/** Reads memory from the target's memory spaces.
|
|
*
|
|
* \param[in] ReadAddress Start address to read from within the target's address space
|
|
* \param[out] ReadBuffer Buffer to store read data into
|
|
* \param[in] ReadSize Length of the data to read from the device
|
|
*
|
|
* \return Boolean true if the command sequence complete successfully
|
|
*/
|
|
bool TINYNVM_ReadMemory(const uint16_t ReadAddress, uint8_t* ReadBuffer, uint16_t ReadSize)
|
|
{
|
|
/* Wait until the NVM controller is no longer busy */
|
|
if (!(TINYNVM_WaitWhileNVMControllerBusy()))
|
|
return false;
|
|
|
|
/* Set the NVM control register to the NO OP command for memory reading */
|
|
TINYNVM_SendWriteNVMRegister(XPROG_Param_NVMCMDRegAddr);
|
|
XPROGTarget_SendByte(TINY_NVM_CMD_NOOP);
|
|
|
|
/* Send the address of the location to read from */
|
|
TINYNVM_SendPointerAddress(ReadAddress);
|
|
|
|
while (ReadSize-- && TimeoutMSRemaining)
|
|
{
|
|
/* Read the byte of data from the target */
|
|
XPROGTarget_SendByte(TPI_CMD_SLD | TPI_POINTER_INDIRECT_PI);
|
|
*(ReadBuffer++) = XPROGTarget_ReceiveByte();
|
|
}
|
|
|
|
return (TimeoutMSRemaining != 0);
|
|
}
|
|
|
|
/** Writes word addressed memory to the target's memory spaces.
|
|
*
|
|
* \param[in] WriteAddress Start address to write to within the target's address space
|
|
* \param[in] WriteBuffer Buffer to source data from
|
|
* \param[in] WriteLength Total number of bytes to write to the device (must be an integer multiple of 2)
|
|
*
|
|
* \return Boolean true if the command sequence complete successfully
|
|
*/
|
|
bool TINYNVM_WriteMemory(const uint16_t WriteAddress, uint8_t* WriteBuffer, uint16_t WriteLength)
|
|
{
|
|
/* Wait until the NVM controller is no longer busy */
|
|
if (!(TINYNVM_WaitWhileNVMControllerBusy()))
|
|
return false;
|
|
|
|
/* Must have an integer number of words to write - if extra byte, word-align via a dummy high byte */
|
|
if (WriteLength & 0x01)
|
|
WriteBuffer[WriteLength++] = 0xFF;
|
|
|
|
/* Set the NVM control register to the WORD WRITE command for memory reading */
|
|
TINYNVM_SendWriteNVMRegister(XPROG_Param_NVMCMDRegAddr);
|
|
XPROGTarget_SendByte(TINY_NVM_CMD_WORDWRITE);
|
|
|
|
/* Send the address of the location to write to */
|
|
TINYNVM_SendPointerAddress(WriteAddress);
|
|
|
|
while (WriteLength)
|
|
{
|
|
/* Wait until the NVM controller is no longer busy */
|
|
if (!(TINYNVM_WaitWhileNVMControllerBusy()))
|
|
return false;
|
|
|
|
/* Write the low byte of data to the target */
|
|
XPROGTarget_SendByte(TPI_CMD_SST | TPI_POINTER_INDIRECT_PI);
|
|
XPROGTarget_SendByte(*(WriteBuffer++));
|
|
|
|
/* Write the high byte of data to the target */
|
|
XPROGTarget_SendByte(TPI_CMD_SST | TPI_POINTER_INDIRECT_PI);
|
|
XPROGTarget_SendByte(*(WriteBuffer++));
|
|
|
|
/* Need to decrement the write length twice, since we read out a whole word */
|
|
WriteLength -= 2;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/** Erases the target's memory space.
|
|
*
|
|
* \param[in] EraseCommand NVM erase command to send to the device
|
|
* \param[in] Address Address inside the memory space to erase
|
|
*
|
|
* \return Boolean true if the command sequence complete successfully
|
|
*/
|
|
bool TINYNVM_EraseMemory(const uint8_t EraseCommand, const uint16_t Address)
|
|
{
|
|
/* Wait until the NVM controller is no longer busy */
|
|
if (!(TINYNVM_WaitWhileNVMControllerBusy()))
|
|
return false;
|
|
|
|
/* Set the NVM control register to the target memory erase command */
|
|
TINYNVM_SendWriteNVMRegister(XPROG_Param_NVMCMDRegAddr);
|
|
XPROGTarget_SendByte(EraseCommand);
|
|
|
|
/* Write to a high byte location within the target address space to start the erase process */
|
|
TINYNVM_SendPointerAddress(Address | 0x0001);
|
|
XPROGTarget_SendByte(TPI_CMD_SST | TPI_POINTER_INDIRECT);
|
|
XPROGTarget_SendByte(0x00);
|
|
|
|
/* Wait until the NVM controller is no longer busy */
|
|
if (!(TINYNVM_WaitWhileNVMControllerBusy()))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
#endif
|