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.
This commit is contained in:
Dean Camera
parent
c299552ab3
commit
2746154652
6 changed files with 274 additions and 6 deletions
54
LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c
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54
LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.c
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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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141
LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.h
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141
LUFA/Drivers/Peripheral/AVRU4U6U7/TWI.h
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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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70
LUFA/Drivers/Peripheral/TWI.h
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70
LUFA/Drivers/Peripheral/TWI.h
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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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