+++ /dev/null
-/*
- LUFA Library
- Copyright (C) Dean Camera, 2011.
-
- dean [at] fourwalledcubicle [dot] com
- www.lufa-lib.org
-*/
-
-/*
- Copyright 2011 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 disclaim 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.
-*/
-
-/** \file
- * \brief TWI peripheral driver for the U7, U6 and U4 USB AVRs.
- *
- * Master mode TWI driver for the AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.
- *
- * \note This file should not be included directly. It is automatically included as needed by the TWI driver
- * dispatch header located in LUFA/Drivers/Peripheral/TWI.h.
- */
-
-/** \ingroup Group_TWI
- * @defgroup Group_TWI_AVRU4U6U7 Series U4, U6 and U7 Model TWI Driver
- *
- * Master mode TWI driver for the AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.
- *
- * \note This file should not be included directly. It is automatically included as needed by the TWI driver
- * dispatch header located in LUFA/Drivers/Peripheral/TWI.h.
- *
- * \section Sec_ExampleUsage Example Usage
- * The following snippet is an example of how this module may be used within a typical
- * application.
- *
- * <b>Low Level API Example:</b>
- * \code
- * // Initialise the TWI driver before first use
- * TWI_Init();
- *
- * // Start a write session to device at device address 0xA0, internal address 0xDC with a 10ms timeout
- * if (TWI_StartTransmission(0xA0 | TWI_ADDRESS_WRITE, 10))
- * {
- * TWI_SendByte(0xDC);
- *
- * TWI_SendByte(0x01);
- * TWI_SendByte(0x02);
- * TWI_SendByte(0x03);
- *
- * // Must stop transmission afterwards to release the bus
- * TWI_StopTransmission();
- * }
- *
- * // Start a read session to device at address 0xA0, internal address 0xDC with a 10ms timeout
- * if (TWI_StartTransmission(0xA0 | TWI_ADDRESS_WRITE, 10))
- * {
- * TWI_SendByte(0xDC);
- * TWI_StopTransmission();
- *
- * if (TWI_StartTransmission(0xA0 | TWI_ADDRESS_READ, 10))
- * {
- * uint8_t Byte1, Byte2, Byte3;
- *
- * // Read three bytes, acknowledge after the third byte is received
- * TWI_ReceiveByte(&Byte1, false);
- * TWI_ReceiveByte(&Byte2, false);
- * TWI_ReceiveByte(&Byte3, true);
- *
- * // Must stop transmission afterwards to release the bus
- * TWI_StopTransmission();
- * }
- * }
- * \endcode
- *
- * <b>High Level API Example:</b>
- * \code
- * // Initialise the TWI driver before first use
- * TWI_Init();
- *
- * // Start a write session to device at device address 0xA0, internal address 0xDC with a 10ms timeout
- * uint8_t InternalWriteAddress = 0xDC;
- * uint8_t WritePacket[3] = {0x01, 0x02, 0x03};
- *
- * TWI_WritePacket(0xA0, 10, &InternalWriteAddress, sizeof(InternalWriteAddress),
- * &WritePacket, sizeof(WritePacket);
- *
- * // Start a read session to device at address 0xA0, internal address 0xDC with a 10ms timeout
- * uint8_t InternalReadAddress = 0xDC;
- * uint8_t ReadPacket[3];
- *
- * TWI_ReadPacket(0xA0, 10, &InternalReadAddress, sizeof(InternalReadAddress),
- * &ReadPacket, sizeof(ReadPacket);
- * \endcode
- *
- * @{
- */
-
-#ifndef __TWI_AVRU4U6U7_H__
-#define __TWI_AVRU4U6U7_H__
-
- /* Includes: */
- #include "../../../Common/Common.h"
-
- #include <avr/io.h>
- #include <stdbool.h>
- #include <stdio.h>
- #include <util/twi.h>
- #include <util/delay.h>
-
- /* Enable C linkage for C++ Compilers: */
- #if defined(__cplusplus)
- extern "C" {
- #endif
-
- /* Preprocessor Checks: */
- #if !defined(__INCLUDE_FROM_TWI_H)
- #error Do not include this file directly. Include LUFA/Drivers/Peripheral/TWI.h instead.
- #endif
-
- /* Public Interface - May be used in end-application: */
- /* Macros: */
- /** TWI slave device address mask for a read session. Mask with a slave device base address to obtain
- * the correct TWI bus address for the slave device when reading data from it.
- */
- #define TWI_ADDRESS_READ 0x00
-
- /** TWI slave device address mask for a write session. Mask with a slave device base address to obtain
- * the correct TWI bus address for the slave device when writing data to it.
- */
- #define TWI_ADDRESS_WRITE 0x01
-
- /** Mask to retrieve the base address for a TWI device, which can then be ORed with \ref TWI_ADDRESS_READ
- * or \ref TWI_ADDRESS_WRITE to obtain the device's read and write address respectively.
- */
- #define TWI_DEVICE_ADDRESS_MASK 0xFE
-
- /* Enums: */
- /** Enum for the possible return codes of the TWI transfer start routine and other dependant TWI functions. */
- enum TWI_ErrorCodes_t
- {
- TWI_ERROR_NoError = 0, /**< Indicates that the command completed sucessfully. */
- TWI_ERROR_BusFault = 1, /**< A TWI bus fault occurred while attempting to capture the bus. */
- TWI_ERROR_BusCaptureTimeout = 2, /**< A timeout occurred whilst waiting for the bus to be ready. */
- TWI_ERROR_SlaveResponseTimeout = 3, /**< No ACK received at the nominated slave address within the timeout period. */
- TWI_ERROR_SlaveNotReady = 4, /**< Slave NAKed the TWI bus START condition. */
- TWI_ERROR_SlaveNAK = 5, /**< Slave NAKed whilst attempting to send data to the device. */
- };
-
- /* Inline Functions: */
- /** Initialises the TWI hardware into master mode, ready for data transmission and reception. This must be
- * before any other TWI operations.
- */
- static inline void TWI_Init(void) ATTR_ALWAYS_INLINE;
- static inline void TWI_Init(void)
- {
- TWCR |= (1 << TWEN);
- }
-
- /** Turns off the TWI driver hardware. If this is called, any further TWI operations will require a call to
- * \ref TWI_Init() before the TWI can be used again.
- */
- static inline void TWI_Disable(void) ATTR_ALWAYS_INLINE;
- static inline void TWI_Disable(void)
- {
- TWCR &= ~(1 << TWEN);
- }
-
- /** Sends a TWI STOP onto the TWI bus, terminating communication with the currently addressed device. */
- static inline void TWI_StopTransmission(void) ATTR_ALWAYS_INLINE;
- static inline void TWI_StopTransmission(void)
- {
- TWCR = ((1 << TWINT) | (1 << TWSTO) | (1 << TWEN));
- }
-
- /** Sends a byte to the currently addressed device on the TWI bus.
- *
- * \param[in] Byte Byte to send to the currently addressed device
- *
- * \return Boolean \c true if the recipient ACKed the byte, \c false otherwise
- */
- static inline 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);
- }
-
- /** Receives a byte from the currently addressed device on the TWI bus.
- *
- * \param[in] Byte Location where the read byte is to be stored
- * \param[in] LastByte Indicates if the byte should be ACKed if false, NAKed if true
- *
- * \return Boolean \c true if the byte reception successfully completed, \c false otherwise
- */
- static inline uint8_t TWI_ReceiveByte(uint8_t* const Byte,
- const bool LastByte)
- {
- uint8_t TWCRMask = ((1 << TWINT) | (1 << TWEN));
-
- if (!(LastByte))
- TWCRMask |= (1 << TWEA);
-
- TWCR = TWCRMask;
- while (!(TWCR & (1 << TWINT)));
- *Byte = TWDR;
-
- return ((TWSR & TW_STATUS_MASK) == TW_MR_DATA_ACK);
- }
-
- /* Function Prototypes: */
- /** Begins a master mode TWI bus communication with the given slave device address.
- *
- * \param[in] SlaveAddress Address of the slave TWI device to communicate with
- * \param[in] TimeoutMS Timeout period within which the slave must respond, in milliseconds
- *
- * \return A value from the \ref TWI_ErrorCodes_t enum
- */
- uint8_t TWI_StartTransmission(const uint8_t SlaveAddress,
- const uint8_t TimeoutMS);
-
- /** High level function to perform a complete packet transfer over the TWI bus to the specified
- * device.
- *
- * \param[in] SlaveAddress Base address of the TWI slave device to communicate with
- * \param[in] TimeoutMS Timeout for bus capture and slave START ACK, in milliseconds
- * \param[in] InternalAddress Pointer to a location where the internal slave read start address is stored
- * \param[in] InternalAddressLen Size of the internal device address, in bytes
- * \param[in] Buffer Pointer to a buffer where the read packet data is to be stored
- * \param[in] Length Size of the packet to read, in bytes
- */
- 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);
-
- /** High level function to perform a complete packet transfer over the TWI bus from the specified
- * device.
- *
- * \param[in] SlaveAddress Base address of the TWI slave device to communicate with
- * \param[in] TimeoutMS Timeout for bus capture and slave START ACK, in milliseconds
- * \param[in] InternalAddress Pointer to a location where the internal slave write start address is stored
- * \param[in] InternalAddressLen Size of the internal device address, in bytes
- * \param[in] Buffer Pointer to a buffer where the packet data to send is stored
- * \param[in] Length Size of the packet to send, in bytes
- */
- 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);
-
- /* Disable C linkage for C++ Compilers: */
- #if defined(__cplusplus)
- }
- #endif
-
-#endif
-
-/** @} */
-
projects / pub / lufa.git / blobdiff