Added master mode hardware TWI driver.
Fixed a bug in the incomplete Webserver project, where the packet data was not being written to and read from the correct buffer address.
Dean Camera
16 years ago
parent
c299552ab3
commit
2746154652
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/*
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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#include "TWI.h"
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bool TWI_StartTransmission(uint8_t SlaveAddress)
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{
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for (;;)
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{
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uint8_t IterationsRemaining = 50;
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bool BusCaptured = false;
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while (IterationsRemaining-- && !BusCaptured)
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{
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TWCR = ((1 << TWINT) | (1 << TWSTA) | (1 << TWEN));
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while (!(TWCR & (1 << TWINT)));
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switch (TWSR & TW_STATUS_MASK)
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{
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case TW_START:
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case TW_REP_START:
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BusCaptured = true;
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break;
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case TW_MT_ARB_LOST:
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continue;
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default:
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return false;
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}
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}
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if (!(BusCaptured))
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return false;
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TWDR = SlaveAddress;
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TWCR = ((1 << TWINT) | (1 << TWEN));
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while (!(TWCR & (1 << TWINT)));
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GPIOR0 = (TWSR & TW_STATUS_MASK);
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switch (TWSR & TW_STATUS_MASK)
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{
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case TW_MT_SLA_ACK:
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case TW_MR_SLA_ACK:
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return true;
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default:
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TWI_StopTransmission();
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break;
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}
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}
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}
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@ -0,0 +1,141 @@
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Master mode TWI driver for the AT90USB1287, AT90USB1286, AT90USB647, AT90USB646, ATMEGA16U4 and ATMEGA32U4 AVRs.
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*
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* \note This file should not be included directly. It is automatically included as needed by the TWI driver
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* dispatch header located in LUFA/Drivers/Peripheral/TWI.h.
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*/
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/** \ingroup Group_TWI
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* @defgroup Group_TWI_AVRU4U6U7 Series U4, U6 and U7 Model TWI Driver
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*
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* @{
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*/
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#ifndef __TWI_AVRU4U6U7_H__
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#define __TWI_AVRU4U6U7_H__
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/* Includes: */
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#include "../../../Common/Common.h"
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#include <avr/io.h>
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#include <stdbool.h>
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#include <util/twi.h>
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Preprocessor Checks: */
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#if !defined(INCLUDE_FROM_TWI_H)
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#error Do not include this file directly. Include LUFA/Drivers/Peripheral/TWI.h instead.
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#endif
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/* Public Interface - May be used in end-application: */
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/* Pseudo-Function Macros: */
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#if defined(__DOXYGEN__)
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/** Initializes the TWI hardware into master mode, ready for data transmission and reception. This must be
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* before any other TWI operations.
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*/
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static inline void TWI_Init(void);
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/** Turns off the TWI driver hardware. If this is called, any further TWI operations will require a call to
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* \ref TWI_Init() before the TWI can be used again.
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*/
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static inline void TWI_ShutDown(void);
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#else
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#define TWI_Init() MACROS{ TWCR |= (1 << TWEN); }MACROE
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#define TWI_ShutDown() MACROS{ TWCR &= ~(1 << TWEN); }MACROE
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#endif
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/* Inline Functions: */
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/** Sends a TWI STOP onto the TWI bus, terminating communication with the currently addressed device. */
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static inline void TWI_StopTransmission(void)
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{
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TWCR = ((1 << TWINT) | (1 << TWSTO) | (1 << TWEN));
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}
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/** Sends a byte to the currently addressed device on the TWI bus.
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*
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* \param Byte Byte to send to the currently addressed device
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*
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* \return Boolean true if the recipient ACKed the byte, false otherwise
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*/
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static inline bool TWI_SendByte(uint8_t Byte)
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{
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TWDR = Byte;
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TWCR = ((1 << TWINT) | (1 << TWEN));
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while (!(TWCR & (1 << TWINT)));
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return ((TWSR & TW_STATUS_MASK) == TW_MT_DATA_ACK);
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}
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/** Receives a byte from the currently addressed device on the TWI bus.
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*
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* \param Byte Location where the read byte is to be stored
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* \param LastByte Indicates if the byte should be ACKed if false, NAKed if true
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*
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* \return Boolean true if the byte reception sucessfully completed, false otherwise
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*/
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static inline bool TWI_ReceiveByte(uint8_t* Byte, bool LastByte)
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{
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uint8_t TWCRMask = ((1 << TWINT) | (1 << TWEN));
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if (!(LastByte))
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TWCRMask |= (1 << TWEA);
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TWCR = TWCRMask;
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while (!(TWCR & (1 << TWINT)));
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*Byte = TWDR;
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return ((TWSR & TW_STATUS_MASK) == TW_MR_DATA_ACK);
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}
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/* Function Prototypes: */
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/** Begins a master mode TWI bus communication with the given slave device address.
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*
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* \param SlaveAddress Address of the slave TWI device to communicate with
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*
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* \return Boolean true if the device is ready for data, false otherwise
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*/
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bool TWI_StartTransmission(uint8_t SlaveAddress);
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/** @} */
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@ -0,0 +1,70 @@
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/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* This file is the master dispatch header file for the device-specific ADC driver, for AVRs containing an ADC.
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*
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* User code should include this file, which will in turn include the correct ADC driver header file for the
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* currently selected AVR model.
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*/
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/** \ingroup Group_PeripheralDrivers
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* @defgroup Group_TWI TWI Driver - LUFA/Drivers/Peripheral/TWI.h
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*
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* \section Sec_Dependencies Module Source Dependencies
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* The following files must be built with any user project that uses this module:
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* - LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c (for U4, U6 and U7 AVR models)
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*
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* \section Module Description
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* Master Mode Hardware TWI driver. This module provides an easy to use driver for the hardware
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* TWI present on many AVR models, for the transmission and reception of data on a TWI bus.
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*/
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#ifndef __TWI_H__
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#define __TWI_H__
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/* Macros: */
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#if !defined(__DOXYGEN__)
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#define INCLUDE_FROM_TWI_H
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#define INCLUDE_FROM_CHIP_DRIVER
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#endif
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/* Includes: */
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#if (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || \
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defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB647__) || \
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defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || \
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defined(__AVR_ATmega32U6__))
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#include "AVRU4U6U7/TWI.h"
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#else
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#error "TWI is not available for the currently selected AVR model."
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#endif
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#endif
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