Squashed 'lib/lufa/' content from commit 385d40300

git-subtree-dir: lib/lufa
git-subtree-split: 385d4030035dbaf41591309dbde47653bd03841b

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