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/*
* Author: Benedikt Sauter <sauter@ixbat.de>
* 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 "spi.h"
void spi_parser(char *buf)
{
switch(buf[0]) {
case CMD_SPI_INIT:
spi_init_usb();
break;
case CMD_SPI_DEINIT:
spi_deinit_usb();
break;
case CMD_SPI_SPEED:
spi_set_speed_usb((int)buf[2]);
break;
case CMD_SPI_SEND:
spi_send_usb(&buf[2], (int)buf[1]);
break;
case CMD_SPI_RECV:
spi_receive_usb((int)buf[1]);
case CMD_SPI_SEND_AND_RECV:
spi_send_and_receive_usb(&buf[2], (int)buf[1]);
break;
default:
answer[0] = buf[0];
answer[1] = RSP_UNKOWN_CMD;
answer[2] = 0;
CommandAnswer(3);
}
}
void spi_init_usb(void)
{
answer[0] = CMD_SPI_INIT;
answer[1] = (unsigned char) spi_init();
answer[3] = 0;
CommandAnswer(3);
}
int spi_init(void)
{
PORTB &= ~((1 << SCK)|(1<<MISO)|(1<<MOSI)); // SCK have to be low in IDLE
DDRB &=~(1 << MISO);
DDRB = (1 << MOSI)|(1 << SCK);
SPCR = 0;
SPSR = 0;
SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0)|(1<<SPR1);
octopus.ports[5]=PIN_SCK;
octopus.ports[6]=PIN_MOSI;
octopus.ports[7]=PIN_MISO;
return RSP_OK;
}
void spi_deinit_usb(void)
{
answer[0]=CMD_SPI_DEINIT;
answer[1]=(unsigned char)spi_deinit();
answer[2]=0;
CommandAnswer(3);
}
int spi_deinit(void)
{
SPCR = 0;
SPSR = 0;
octopus.ports[5]=PIN_OUT; // this is wrong!
octopus.ports[6]=PIN_OUT; // this is wrong!
octopus.ports[7]=PIN_OUT; // this is wrong!
return RSP_OK;
}
void spi_set_speed_usb(int speed){
}
int spi_set_speed(int speed){
return RSP_OK;
}
void spi_send_usb(char * buf, int length)
{
answer[0]=CMD_SPI_SEND;
answer[1]=(unsigned char)spi_send(buf,length);
answer[2]=0;
CommandAnswer(3);
}
int spi_send(char * buf, int length)
{
int i;
for(i=0;i<length;i++){
SPDR = buf[i];
while ( !(SPSR & (1 << SPIF)) ) ;
}
return RSP_OK;
}
void spi_receive_usb(int length)
{
answer[0]=CMD_SPI_RECV;
answer[1]=(unsigned char)spi_receive((char*)&answer[2],length);
answer[2]=0;
CommandAnswer(length+2);
}
unsigned char spi_receive( char * buf, int length)
{
int i;
int timeout = 0;
for(i=0;i<length;i++){
SPDR = 0;
while(!(SPSR & (1 << SPIF))) { timeout++; if( timeout > 1000) return RSP_TIMEOUT; }
buf[i]=SPDR;
}
return RSP_OK;
}
void spi_send_and_receive_usb(char * txbuf, int length)
{
answer[0]=CMD_SPI_SEND;
answer[1]=(unsigned char)spi_send_and_receive(txbuf,(char *)&answer[2],length);
answer[2]=0;
CommandAnswer(2+length);
}
int spi_send_and_receive(char * txbuf, char * rxbuf, int length){
int i, timeout=0;
for(i=0;i<length;i++){
SPDR = txbuf[i];
//while ( !(SPSR & (1 << SPIF)) ) ;
while(!(SPSR & (1 << SPIF))) { timeout++; if( timeout > 1000) return RSP_TIMEOUT; }
rxbuf[i]=SPDR;
}
return RSP_OK;
}
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