392 lines
9.2 KiB
C
392 lines
9.2 KiB
C
/*
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* Copyright (c) 2014, Ingo Gulyas Intembsys
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* I2C driver for ATMEGA128rfa1
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*
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* \author
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* Ingo Gulyas Intembsys
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* office@intembsys.at
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* www.intembsys.at
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*/
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#include "i2c.h"
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#include "contiki-conf.h"
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#include <stdint.h>
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#include <avr/power.h>
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#include <stdbool.h>
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#include <stddef.h>
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#if I2C_TD != 0
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#include <stdio.h>
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#include <avr/pgmspace.h>
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#include "system_mgmt.h"
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#define PRINTD(FORMAT,args...) {sleep_acquire_lock(); printf_P(PSTR(FORMAT),##args); sleep_release_lock();}
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#else
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#define PRINTD(...)
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#endif
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#if WITH_RTDEBUG == 1
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#include "rtdebug.h"
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#define RTDEBUG_PUSH(x) rtdebug_push(x)
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#else
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#warning "I2C Driver compiling without RTDEBUG!"
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#define RTDEBUG_PUSH(x)
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#endif
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#ifndef TIMEOUT_TIMER
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#warning "I2C Driver compiling without TIMEOUT!"
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#endif
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static int8_t wait_job();
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static int8_t wait_stop();
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static int8_t i2c_ioctl(const i2c_driver* const me, uint8_t cmd, uint8_t arg);
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static int8_t i2c_read(const i2c_driver* const me, uint8_t cmd_flags, uint8_t* buffer, uint8_t len);
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static int8_t i2c_write(const i2c_driver* const me, uint8_t cmd_flags, const uint8_t* data, uint8_t len);
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// static linkage of member functions
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i2c_driver i2c_drv = {i2c_ioctl, i2c_read, i2c_write};
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// lock spi if driver opened to prevent further opening access
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static volatile bool i2c_lock = false;
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///////////////////////////////////////////////////////////////
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// global functions
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///////////////////////////////////////////////////////////////
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i2c_driver* i2c_open(void)
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{
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if(i2c_lock == true)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_OPEN__DEVICE_BUSY);
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return NULL;
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}
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i2c_lock = true;
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power_twi_enable();
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I2C_INIT();
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TWBR = I2C_FREQ_STANDARD;
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TWSR &= ~((1<<TWPS1) | (1<<TWPS0));
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TWSR |= (1<<TWPS0);
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TWCR = (1<<TWEN);
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return &i2c_drv;
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}
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void i2c_close(i2c_driver* const me)
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{
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if(me == NULL || i2c_lock == false)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_CLOSE__NO_DEVICE);
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return;
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}
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i2c_reset();
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return;
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}
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void i2c_reset(void)
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{
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TWCR &= ~(1<<TWEN);
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I2C_DEINIT();
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power_twi_disable();
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i2c_lock = false;
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return;
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}
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///////////////////////////////////////////////////////////////
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// local helper functions
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///////////////////////////////////////////////////////////////
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#ifdef TIMEOUT_TIMER
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static int8_t wait_job()
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{
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int8_t status = I2C_OK;
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uint16_t timeout = TIMEOUT_TIMER_NOW_ADD(I2C_TIMEOUT);
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while (!(TWCR & (1<<TWINT)))
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{
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if(!(TIMEOUT_TIMER_LT(TIMEOUT_TIMER_NOW(), timeout)))
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{
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status = I2C_ERROR_TIMEOUT;
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break;
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}
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}
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return status;
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}
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static int8_t wait_stop()
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{
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int8_t status = I2C_OK;
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uint16_t timeout = TIMEOUT_TIMER_NOW_ADD(I2C_TIMEOUT);
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while (TWCR & (1<<TWSTO))
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{
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if(!(TIMEOUT_TIMER_LT(TIMEOUT_TIMER_NOW(), timeout)))
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{
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status = I2C_ERROR_TIMEOUT;
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break;
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}
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}
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return status;
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}
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#else
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static int8_t wait_job()
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{
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while (!(TWCR & (1<<TWINT)));
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return I2C_OK;
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}
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static int8_t wait_stop()
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{
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while (TWCR & (1<<TWSTO));
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return I2C_OK;
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}
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#endif
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///////////////////////////////////////////////////////////////
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// member functions
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///////////////////////////////////////////////////////////////
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static int8_t i2c_ioctl(const i2c_driver* const me, uint8_t cmd, uint8_t arg)
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{
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if(me == NULL || i2c_lock == false)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_IOCTL__DEVICE_CLOSED);
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return I2C_ERROR_DRIVER;
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}
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if(cmd == I2C_IOCTL_CMD_SET_FREQ)
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{
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switch(arg)
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{
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case I2C_FREQ_400KHZ: TWBR = I2C_FREQ_400KHZ; break;
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case I2C_FREQ_250KHZ: TWBR = I2C_FREQ_250KHZ; break;
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case I2C_FREQ_100KHZ: TWBR = I2C_FREQ_100KHZ; break;
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case I2C_FREQ_50KHZ: TWBR = I2C_FREQ_50KHZ; break;
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case I2C_FREQ_10KHZ: TWBR = I2C_FREQ_10KHZ; break;
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default:
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_IOCTL__ARG_INVALID);
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return I2C_ERROR_DRIVER;
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}
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}
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}
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else
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_IOCTL__CMD_INVALID);
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return I2C_ERROR_DRIVER;
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}
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return I2C_OK;
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}
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static int8_t i2c_read(const i2c_driver* const me, uint8_t cmd_flags, uint8_t* buffer, uint8_t len)
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{
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uint8_t i = 0;
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int8_t status = I2C_OK;
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if(me == NULL || i2c_lock == false)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_READ__DEVICE_CLOSED);
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return I2C_ERROR_DRIVER;
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}
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if((len > 0) && (buffer == NULL))
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_READ__ERROR_NULLPOINTER);
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return I2C_ERROR_DRIVER;
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}
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do
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{
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if(cmd_flags & I2C_CMD_FLAG_START)
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{
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I2C_START();
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if(wait_job() != I2C_OK)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_READ__START_TIMEOUT);
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status = I2C_ERROR_TIMEOUT;
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break;
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}
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if((I2C_STATUS() != I2C_STATUS_START) && (I2C_STATUS() != I2C_STATUS_START_REP))
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_READ__START_ERROR);
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status = I2C_ERROR_START;
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break;
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}
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PRINTD("I2C-RD-START\n");
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}
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if(len == 0) break;
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for(i=0; i<(len-1); i++)
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{
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I2C_READ_BYTE_ACK();
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if(wait_job() != I2C_OK)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_READ__READ_BYTE_ACK_TIMEOUT);
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status = I2C_ERROR_TIMEOUT;
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break;
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}
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if(I2C_STATUS() != I2C_STATUS_DATAR_ACK)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_READ__READ_BYTE_ACK_ERROR);
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status = I2C_ERROR_READ;
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break;
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}
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buffer[i] = I2C_RX_REG;
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PRINTD("I2C-RD-RACK: 0x%02X\n", buffer[i]);
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}
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I2C_READ_BYTE_NACK();
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if(wait_job() != I2C_OK)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_READ__READ_BYTE_NACK_TIMEOUT);
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status = I2C_ERROR_TIMEOUT;
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break;
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}
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if(I2C_STATUS() != I2C_STATUS_DATAR_NACK)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_READ__READ_BYTE_NACK_ERROR);
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status = I2C_ERROR_READ;
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break;
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}
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buffer[i] = I2C_RX_REG;
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PRINTD("I2C-RD-RNACK: 0x%02X\n", buffer[i]);
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} while (0);
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if(cmd_flags & I2C_CMD_FLAG_STOP)
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{
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I2C_STOP();
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if(wait_stop() != I2C_OK)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_READ__STOP_TIMEOUT);
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status = I2C_ERROR_TIMEOUT;
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}
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PRINTD("I2C-RD_STOP\n");
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}
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return status;
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}
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static int8_t i2c_write(const i2c_driver* const me, uint8_t cmd_flags, const uint8_t* data, uint8_t len)
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{
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uint8_t i = 0;
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int8_t status = I2C_OK;
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if(me == NULL || i2c_lock == false)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_WRITE__DEVICE_CLOSED);
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return I2C_ERROR_DRIVER;
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}
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if((len > 0) && (data == NULL))
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_WRITE__ERROR_NULLPOINTER);
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return I2C_ERROR_DRIVER;
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}
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do
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{
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if(cmd_flags & I2C_CMD_FLAG_START)
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{
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I2C_START();
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if(wait_job() != I2C_OK)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_WRITE__START_TIMEOUT);
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status = I2C_ERROR_TIMEOUT;
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break;
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}
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if((I2C_STATUS() != I2C_STATUS_START) && (I2C_STATUS() != I2C_STATUS_START_REP))
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_WRITE__START_ERROR);
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status = I2C_ERROR_START;
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break;
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}
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PRINTD("I2C-WR-START\n");
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}
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for(i=0; i<len; i++)
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{
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I2C_TX_REG = data[i];
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I2C_WRITE_BYTE();
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if(wait_job() != I2C_OK)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_WRITE__WRITE_BYTE_TIMEOUT);
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status = I2C_ERROR_TIMEOUT;
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break;
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}
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if((I2C_STATUS() != I2C_STATUS_DATAW_ACK) && (I2C_STATUS() != I2C_STATUS_SLAW_ACK) && (I2C_STATUS() != I2C_STATUS_SLAR_ACK))
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_WRITE__WRITE_BYTE_ERROR);
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status = I2C_ERROR_WRITE;
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break;
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}
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PRINTD("I2C-WR-BYTE: 0x%02X\n", data[i]);
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}
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} while (0);
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if(cmd_flags & I2C_CMD_FLAG_STOP)
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{
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I2C_STOP();
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if(wait_stop() != I2C_OK)
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{
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RTDEBUG_PUSH(RTDEBUG_CODE__I2C_WRITE__STOP_TIMEOUT);
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status = I2C_ERROR_TIMEOUT;
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}
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PRINTD("I2C-WR-STOP\n");
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}
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return status;
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}
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