+/*\r
+ LUFA Library\r
+ Copyright (C) Dean Camera, 2010.\r
+ \r
+ dean [at] fourwalledcubicle [dot] com\r
+ www.fourwalledcubicle.com\r
+*/\r
+\r
+/*\r
+ Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
+\r
+ Permission to use, copy, modify, distribute, and sell this \r
+ software and its documentation for any purpose is hereby granted\r
+ without fee, provided that the above copyright notice appear in \r
+ all copies and that both that the copyright notice and this\r
+ permission notice and warranty disclaimer appear in supporting \r
+ documentation, and that the name of the author not be used in \r
+ advertising or publicity pertaining to distribution of the \r
+ software without specific, written prior permission.\r
+\r
+ The author disclaim all warranties with regard to this\r
+ software, including all implied warranties of merchantability\r
+ and fitness. In no event shall the author be liable for any\r
+ special, indirect or consequential damages or any damages\r
+ whatsoever resulting from loss of use, data or profits, whether\r
+ in an action of contract, negligence or other tortious action,\r
+ arising out of or in connection with the use or performance of\r
+ this software.\r
+*/\r
+\r
+/** \file\r
+ *\r
+ * Master mode TWI driver for the AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.\r
+ *\r
+ * \note This file should not be included directly. It is automatically included as needed by the TWI driver\r
+ * dispatch header located in LUFA/Drivers/Peripheral/TWI.h.\r
+ */\r
+\r
+/** \ingroup Group_TWI\r
+ * @defgroup Group_TWI_AVRU4U6U7 Series U4, U6 and U7 Model TWI Driver\r
+ *\r
+ * @{\r
+ */\r
+\r
+#ifndef __TWI_AVRU4U6U7_H__\r
+#define __TWI_AVRU4U6U7_H__\r
+\r
+ /* Includes: */\r
+ #include "../../../Common/Common.h"\r
+ \r
+ #include <avr/io.h>\r
+ #include <stdbool.h>\r
+ #include <util/twi.h>\r
+ \r
+ /* Enable C linkage for C++ Compilers: */\r
+ #if defined(__cplusplus)\r
+ extern "C" {\r
+ #endif\r
+\r
+ /* Preprocessor Checks: */\r
+ #if !defined(INCLUDE_FROM_TWI_H)\r
+ #error Do not include this file directly. Include LUFA/Drivers/Peripheral/TWI.h instead.\r
+ #endif\r
+\r
+ /* Public Interface - May be used in end-application: */\r
+ /* Pseudo-Function Macros: */\r
+ #if defined(__DOXYGEN__)\r
+ /** Initializes the TWI hardware into master mode, ready for data transmission and reception. This must be\r
+ * before any other TWI operations.\r
+ */\r
+ static inline void TWI_Init(void);\r
+ \r
+ /** Turns off the TWI driver hardware. If this is called, any further TWI operations will require a call to\r
+ * \ref TWI_Init() before the TWI can be used again.\r
+ */ \r
+ static inline void TWI_ShutDown(void);\r
+ #else\r
+ #define TWI_Init() MACROS{ TWCR |= (1 << TWEN); }MACROE\r
+ #define TWI_ShutDown() MACROS{ TWCR &= ~(1 << TWEN); }MACROE\r
+ #endif\r
+\r
+ /* Inline Functions: */\r
+ /** Sends a TWI STOP onto the TWI bus, terminating communication with the currently addressed device. */\r
+ static inline void TWI_StopTransmission(void)\r
+ {\r
+ TWCR = ((1 << TWINT) | (1 << TWSTO) | (1 << TWEN));\r
+ }\r
+\r
+ /** Sends a byte to the currently addressed device on the TWI bus.\r
+ *\r
+ * \param Byte Byte to send to the currently addressed device\r
+ *\r
+ * \return Boolean true if the recipient ACKed the byte, false otherwise\r
+ */\r
+ static inline bool TWI_SendByte(uint8_t Byte)\r
+ {\r
+ TWDR = Byte;\r
+ TWCR = ((1 << TWINT) | (1 << TWEN)); \r
+ while (!(TWCR & (1 << TWINT)));\r
+\r
+ return ((TWSR & TW_STATUS_MASK) == TW_MT_DATA_ACK);\r
+ }\r
+\r
+ /** Receives a byte from the currently addressed device on the TWI bus.\r
+ *\r
+ * \param Byte Location where the read byte is to be stored\r
+ * \param LastByte Indicates if the byte should be ACKed if false, NAKed if true\r
+ *\r
+ * \return Boolean true if the byte reception sucessfully completed, false otherwise\r
+ */\r
+ static inline bool TWI_ReceiveByte(uint8_t* Byte, bool LastByte)\r
+ {\r
+ uint8_t TWCRMask = ((1 << TWINT) | (1 << TWEN));\r
+ \r
+ if (!(LastByte))\r
+ TWCRMask |= (1 << TWEA);\r
+\r
+ TWCR = TWCRMask;\r
+ while (!(TWCR & (1 << TWINT)));\r
+ *Byte = TWDR;\r
+\r
+ return ((TWSR & TW_STATUS_MASK) == TW_MR_DATA_ACK);\r
+ }\r
+\r
+ /* Function Prototypes: */\r
+ /** Begins a master mode TWI bus communication with the given slave device address.\r
+ *\r
+ * \param SlaveAddress Address of the slave TWI device to communicate with\r
+ *\r
+ * \return Boolean true if the device is ready for data, false otherwise\r
+ */\r
+ bool TWI_StartTransmission(uint8_t SlaveAddress);\r
+\r
+ /* Disable C linkage for C++ Compilers: */\r
+ #if defined(__cplusplus)\r
+ }\r
+ #endif\r
+\r
+#endif\r
+\r
+/** @} */\r
projects / pub / USBasp.git / commitdiff