Squashed 'tmk_core/' changes from caca2c0..dc0e46e

dc0e46e Rename LUFA to LUFA-git
3bfa7fa Remove LUFA-120730
215b764 Merge commit 'afa0f22a9299686fd88f58ce09c5b521ac917e8f' as 'protocol/lufa/LUFA'
afa0f22 Squashed 'protocol/lufa/LUFA/' content from commit def7fca
c0c42fa Remove submodule of LUFA
30f897d Merge commit '87ced33feb74e79c3281dda36eb6d6d153399b41' as 'protocol/usb_hid/USB_Host_Shield_2.0'
87ced33 Squashed 'protocol/usb_hid/USB_Host_Shield_2.0/' content from commit aab4a69
14f6d49 Remove submodule of USB_Host_Shield_2.0

git-subtree-dir: tmk_core
git-subtree-split: dc0e46eaa4367d4e218f8816e3c117895820f07c

protocol/lufa/LUFA-git/LUFA/Drivers/Peripheral/AVR8/TWI_AVR8.c

@@ -0,0 +1,209 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2014.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2014  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_AVR8) && defined(TWCR)
+
+#define  __INCLUDE_FROM_TWI_C
+#include "../TWI.h"
+
+uint8_t TWI_StartTransmission(const uint8_t SlaveAddress,
+                              const uint8_t TimeoutMS)
+{
+	for (;;)
+	{
+		bool     BusCaptured = false;
+		uint16_t TimeoutRemaining;
+
+		TWCR = ((1 << TWINT) | (1 << TWSTA) | (1 << TWEN));
+
+		TimeoutRemaining = (TimeoutMS * 100);
+		while (TimeoutRemaining && !(BusCaptured))
+		{
+			if (TWCR & (1 << TWINT))
+			{
+				switch (TWSR & TW_STATUS_MASK)
+				{
+					case TW_START:
+					case TW_REP_START:
+						BusCaptured = true;
+						break;
+					case TW_MT_ARB_LOST:
+						TWCR = ((1 << TWINT) | (1 << TWSTA) | (1 << TWEN));
+						continue;
+					default:
+						TWCR = (1 << TWEN);
+						return TWI_ERROR_BusFault;
+				}
+			}
+
+			_delay_us(10);
+			TimeoutRemaining--;
+		}
+
+		if (!(TimeoutRemaining))
+		{
+			TWCR = (1 << TWEN);
+			return TWI_ERROR_BusCaptureTimeout;
+		}
+
+		TWDR = SlaveAddress;
+		TWCR = ((1 << TWINT) | (1 << TWEN));
+
+		TimeoutRemaining = (TimeoutMS * 100);
+		while (TimeoutRemaining)
+		{
+			if (TWCR & (1 << TWINT))
+			  break;
+
+			_delay_us(10);
+			TimeoutRemaining--;
+		}
+
+		if (!(TimeoutRemaining))
+		  return TWI_ERROR_SlaveResponseTimeout;
+
+		switch (TWSR & TW_STATUS_MASK)
+		{
+			case TW_MT_SLA_ACK:
+			case TW_MR_SLA_ACK:
+				return TWI_ERROR_NoError;
+			default:
+				TWCR = ((1 << TWINT) | (1 << TWSTO) | (1 << TWEN));
+				return TWI_ERROR_SlaveNotReady;
+		}
+	}
+}
+
+bool TWI_SendByte(const uint8_t Byte)
+{
+	TWDR = Byte;
+	TWCR = ((1 << TWINT) | (1 << TWEN));
+	while (!(TWCR & (1 << TWINT)));
+
+	return ((TWSR & TW_STATUS_MASK) == TW_MT_DATA_ACK);
+}
+
+bool TWI_ReceiveByte(uint8_t* const Byte,
+					 const bool LastByte)
+{
+	uint8_t TWCRMask;
+
+	if (LastByte)
+	  TWCRMask = ((1 << TWINT) | (1 << TWEN));
+	else
+	  TWCRMask = ((1 << TWINT) | (1 << TWEN) | (1 << TWEA));
+
+	TWCR = TWCRMask;
+	while (!(TWCR & (1 << TWINT)));
+	*Byte = TWDR;
+
+	uint8_t Status = (TWSR & TW_STATUS_MASK);
+
+	return ((LastByte) ? (Status == TW_MR_DATA_NACK) : (Status == TW_MR_DATA_ACK));
+}
+
+uint8_t TWI_ReadPacket(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((SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_WRITE,
+	                                       TimeoutMS)) == TWI_ERROR_NoError)
+	{
+		while (InternalAddressLen--)
+		{
+			if (!(TWI_SendByte(*(InternalAddress++))))
+			{
+				ErrorCode = TWI_ERROR_SlaveNAK;
+				break;
+			}
+		}
+
+		if ((ErrorCode = TWI_StartTransmission((SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_READ,
+											   TimeoutMS)) == TWI_ERROR_NoError)
+		{
+			while (Length--)
+			{
+				if (!(TWI_ReceiveByte(Buffer++, (Length == 0))))
+				{
+					ErrorCode = TWI_ERROR_SlaveNAK;
+					break;
+				}
+			}
+
+			TWI_StopTransmission();
+		}
+	}
+
+	return ErrorCode;
+}
+
+uint8_t TWI_WritePacket(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((SlaveAddress & TWI_DEVICE_ADDRESS_MASK) | TWI_ADDRESS_WRITE,
+	                                       TimeoutMS)) == TWI_ERROR_NoError)
+	{
+		while (InternalAddressLen--)
+		{
+			if (!(TWI_SendByte(*(InternalAddress++))))
+			{
+				ErrorCode = TWI_ERROR_SlaveNAK;
+				break;
+			}
+		}
+
+		while (Length--)
+		{
+			if (!(TWI_SendByte(*(Buffer++))))
+			{
+				ErrorCode = TWI_ERROR_SlaveNAK;
+				break;
+			}
+		}
+
+		TWI_StopTransmission();
+	}
+
+	return ErrorCode;
+}
+
+#endif