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/*
*
* mur.sat
*
* Somewhen in the year 2012, mur.at will have a nano satellite launched
* into a low earth orbit (310 km above the surface of our planet). The
* satellite itself is a TubeSat personal satellite kit, developed and
* launched by interorbital systems. mur.sat is a joint venture of mur.at,
* ESC im Labor and realraum.
*
* Please visit the project hompage at sat.mur.at for further information.
*
*
* Copyright (C) 2012 Bernhard Tittelbach <xro@realraum.at>
*
* This file is part of mur.sat.
*
* mur.sat is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* mur.sat is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with mur.sat. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "avr/io.h"
#include "spi.h"
#define SPI_DDR DDRB
#define SPI_PORT PORTB
#define SPI_PINB_REG PINB
#define CS 0
#define SCK 1
#define MOSI 2
#define MISO 3
#define GDO2 4
#define GDO0 5
#define RE 6
#define TE 7
void spi_init(void)
{
//configure Direction of SS / PB0 , MOSI and SCLK as Output to drive CS of CC1101
DDRB = (1<<DDB0) | (1<<DDB1) | (1<<DDB2);
SPI_PORT = 0;
SPI_DDR = (1<<MOSI)|(1<<SCK)|(1<<CS);
SPCR = (1<<SPE)|(1<<MSTR); // | (0<<DORD) //select MSB first: DORD == 0
// SPSR = (0<<SPI2X) // f_osc/4
// SPSR = (1<<SPI2X) // f_osc/2
// SPSR = (1<<SPI2X); (4MHz vs. 8MHz)
}
void spi_cs_enable(void)
{
//pull low
PORTB &= ~(1<<CS);
}
void spi_cs_disable(void)
{
//pull high
PORTB |= (1<<CS);
}
//synchronous
//MSB first
void spi_write_byte(char byte)
{
SPDR = byte; //Load byte to Data register
while(!(SPSR & (1<<SPIF))); // Wait for transmission complete
}
//~ void spi_write(char* data, unsigned int len)
//~ {
//~ for (unsigned int c=0; c<len; c++)
//~ spi_write_byte(data[c]);
//~ }
//MSB first
char spi_read_byte(void)
{
while(SPI_PINB_REG & (1<<MISO)); /* wait for CC1101 to get ready... */
return SPSR;
}
//~ void spi_read(unsigned int maxlen, char *data, unsigned int *len)
//~ {
//~ PORTB |= (1<<CS);
//~ while(SPI_PINB_REG & (1<<MISO)); /* wait for CC1101 to get ready... */
//~ SPDR = 0x80;
//~ len = 0;
//~ while(*len < maxlen && !(SPSR & (1<<SPIF)))
//~ data[*len++]=SPSR;
//~ PORTB &= ~(1<<CS);
//~ }
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