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/*
* Author: Benedikt Sauter
* Author: Peter Huewe, Hubert Hogel
* All rights reserved.
*
* Short descripton of file:
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the FH Augsburg nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "common.h"
#include "protocol.h"
#include "i2c.h"
#define I2C_WAIT_FOR_COMPLETE() while (!(TWCR & (1<<TWINT)));
void i2c_parser(char *buf)
{
answer[0] = buf[0];
switch(buf[0]){
case CMD_I2C_INIT:
i2c_init_usb();
break;
case CMD_I2C_DEINIT:
i2c_deinit_usb();
break;
case CMD_I2C_SET_BITRATE:
i2c_set_bitrate_usb((char)buf[2]);
break;
case CMD_I2C_SEND:
i2c_send_usb((int)buf[2], &buf[3]);
break;
case CMD_I2C_RECV:
i2c_recv_usb((int)buf[2],(int)buf[3]);
break;
case CMD_I2C_SEND_START:
i2c_send_start_usb();
break;
case CMD_I2C_SEND_STOP:
i2c_send_stop_usb();
break;
default:
answer[1] = RSP_UNKOWN_CMD;
answer[2] = 0;
CommandAnswer(3);
}
}
void i2c_init_usb(void)
{
answer[1]=(unsigned char)i2c_init();
answer[2]=0;
CommandAnswer(3);
}
int i2c_init(void)
{
TWCR |= (1<<TWEN);
octopus.ports[12] = PIN_SCL;
octopus.ports[13] = PIN_SDA;
return RSP_OK;
}
void i2c_deinit_usb(void)
{
answer[1]=(unsigned char)i2c_deinit();
answer[2]=0;
CommandAnswer(3);
}
int i2c_deinit(void)
{
TWCR &= ~(1<<TWEN); // deinit
octopus.ports[12]=PIN_NONE;
octopus.ports[13]=PIN_NONE;
return RSP_OK;
}
void i2c_set_bitrate_usb(char bitrate) {
answer[1] = (unsigned char)i2c_set_bitrate(bitrate);
answer[2] = 0;
CommandAnswer(3);
}
int i2c_set_bitrate(char bitrate) {
TWBR = bitrate;
TWSR &= ~((1<<TWPS1) | (1<<TWPS0));
TWSR |= (0<<TWPS0);
return RSP_OK;
}
void i2c_send_start_usb(void)
{
answer[1] = (unsigned char)i2c_send_start();
answer[2] = 0;
CommandAnswer(3);
}
unsigned char i2c_get_twsr(void)
{
return (TWSR & 0xF8);
}
int i2c_send_start(void)
{
i2c_get_twsr();
TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN);
I2C_WAIT_FOR_COMPLETE();
return RSP_OK;
}
void i2c_send_stop_usb(void)
{
answer[1]=(unsigned char)i2c_send_stop();
answer[2]=0;
CommandAnswer(3);
}
int i2c_send_stop(void)
{
TWCR = (1<<TWINT)|(1<<TWEN)|(1<<TWSTO);
while(TWCR & (1<<TWSTO));
return RSP_OK;
}
void i2c_send_usb(int length, char *data)
{
i2c_send(data, length);
answer[1] = RSP_OK;
answer[2] = 0;
CommandAnswer(3);
}
void i2c_send(char *data, int length)
{
int i;
for(i = 0; i < length; i++) {
TWDR = data[i];
TWCR = (1<<TWINT) | (1<<TWEN);
I2C_WAIT_FOR_COMPLETE();
}
}
void i2c_recv_usb(int address, int length)
{
int i;
answer[0]=CMD_I2C_RECV;
answer[1]=RSP_OK;
for(i = 0; i < length; i++)
answer[2+i] = i2c_recv_byte();
answer[length+2] = 0;
CommandAnswer(3+length);
}
unsigned char i2c_recv_byte(void)
{
TWCR = (1<<TWINT) | (1<<TWEN);
I2C_WAIT_FOR_COMPLETE();
return TWDR;
}
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