+++ /dev/null
-/*\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 8-Bit AVRs containing a hardware TWI module.\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_AVR8 Series U4, U6 and U7 Model TWI Driver\r
- *\r
- * Master mode TWI driver for the 8-Bit AVRs containing a hardware TWI module.\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
- */\r
-\r
-#ifndef __TWI_AVR8_H__\r
-#define __TWI_AVR8_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[in] 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[in] Byte Location where the read byte is to be stored\r
- * \param[in] 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[in] 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 / lufa.git / blobdiff