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path: root/LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c
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Diffstat (limited to 'LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c')
-rw-r--r--LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c185
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