diff options
Diffstat (limited to 'LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c')
| -rw-r--r-- | LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c b/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c new file mode 100644 index 0000000000..92cc643b9e --- /dev/null +++ b/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c @@ -0,0 +1,185 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 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, + uint16_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, + uint16_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 |