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/*
LUFA Library
Copyright (C) Dean Camera, 2013.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
Copyright 2013 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 disclaims 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.
*/
#include "../../../Common/Common.h"
#if (ARCH == ARCH_XMEGA)
#define __INCLUDE_FROM_TWI_C
#include "../TWI.h"
uint8_t TWI_StartTransmission(TWI_t* const TWI,
const uint8_t SlaveAddress,
const uint8_t TimeoutMS)
{
uint16_t TimeoutRemaining;
TWI->MASTER.ADDR = SlaveAddress;
TimeoutRemaining = (TimeoutMS * 100);
while (TimeoutRemaining)
{
uint8_t status = TWI->MASTER.STATUS;
if ((status & (TWI_MASTER_WIF_bm | TWI_MASTER_ARBLOST_bm)) == (TWI_MASTER_WIF_bm | TWI_MASTER_ARBLOST_bm))
{
TWI->MASTER.ADDR = SlaveAddress;
}
else if ((status & (TWI_MASTER_WIF_bm | TWI_MASTER_RXACK_bm)) == (TWI_MASTER_WIF_bm | TWI_MASTER_RXACK_bm))
{
TWI_StopTransmission(twi);
return TWI_ERROR_SlaveResponseTimeout;
}
else if (status & (TWI_MASTER_WIF_bm | TWI_MASTER_RIF_bm))
{
return TWI_ERROR_NoError;
}
_delay_us(10);
TimeoutRemaining--;
}
if (!(TimeoutRemaining)) {
if (TWI->MASTER.STATUS & TWI_MASTER_CLKHOLD_bm) {
TWI_StopTransmission(twi);
}
}
return TWI_ERROR_BusCaptureTimeout;
}
bool TWI_SendByte(TWI_t* const TWI,
const uint8_t Byte)
{
TWI->MASTER.DATA = Byte;
while (!(TWI->MASTER.STATUS & TWI_MASTER_WIF_bm));
return (TWI->MASTER.STATUS & TWI_MASTER_WIF_bm) && !(TWI->MASTER.STATUS & TWI_MASTER_RXACK_bm);
}
bool TWI_ReceiveByte(TWI_t* const TWI,
uint8_t* const Byte,
const bool LastByte)
{
if ((TWI->MASTER.STATUS & (TWI_MASTER_BUSERR_bm | TWI_MASTER_ARBLOST_bm)) == (TWI_MASTER_BUSERR_bm | TWI_MASTER_ARBLOST_bm)) {
return false;
}
while (!(TWI->MASTER.STATUS & TWI_MASTER_RIF_bm));
*Byte = TWI->MASTER.DATA;
if (LastByte)
TWI->MASTER.CTRLC = TWI_MASTER_ACKACT_bm | TWI_MASTER_CMD_STOP_gc;
else
TWI->MASTER.CTRLC = TWI_MASTER_CMD_RECVTRANS_gc;
return true;
}
uint8_t TWI_ReadPacket(TWI_t* const TWI,
const uint8_t SlaveAddress,
const uint8_t TimeoutMS,
const uint8_t* InternalAddress,
uint8_t InternalAddressLen,
uint8_t* Buffer,
uint8_t Length)
{
uint8_t ErrorCode;
if ((ErrorCode = TWI_StartTransmission(twi, (SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_WRITE,
TimeoutMS)) == TWI_ERROR_NoError)
{
while (InternalAddressLen--)
{
if (!(TWI_SendByte(twi, *(InternalAddress++))))
{
ErrorCode = TWI_ERROR_SlaveNAK;
break;
}
}
if ((ErrorCode = TWI_StartTransmission(twi, (SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_READ,
TimeoutMS)) == TWI_ERROR_NoError)
{
while (Length--)
{
if (!(TWI_ReceiveByte(twi, Buffer++, (Length == 0))))
{
ErrorCode = TWI_ERROR_SlaveNAK;
break;
}
}
}
TWI_StopTransmission(twi);
}
return ErrorCode;
}
uint8_t TWI_WritePacket(TWI_t* const twi,
const uint8_t SlaveAddress,
const uint8_t TimeoutMS,
const uint8_t* InternalAddress,
uint8_t InternalAddressLen,
const uint8_t* Buffer,
uint8_t Length)
{
uint8_t ErrorCode;
if ((ErrorCode = TWI_StartTransmission(twi, (SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_WRITE,
TimeoutMS)) == TWI_ERROR_NoError)
{
while (InternalAddressLen--)
{
if (!(TWI_SendByte(twi, *(InternalAddress++))))
{
ErrorCode = TWI_ERROR_SlaveNAK;
break;
}
}
while (Length--)
{
if (!(TWI_SendByte(twi, *(Buffer++))))
{
ErrorCode = TWI_ERROR_SlaveNAK;
break;
}
}
TWI_StopTransmission(twi);
}
return ErrorCode;
}
#endif
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