mirror of
git://projects.qi-hardware.com/antorcha.git
synced 2024-11-01 11:28:26 +02:00
52 lines
787 B
C
52 lines
787 B
C
/*
|
|
* fw/spi.c - SPI I/O
|
|
*
|
|
* Written 2012 by Werner Almesberger
|
|
* Copyright 2012 Werner Almesberger
|
|
*
|
|
* This program 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 2 of the License, or
|
|
* (at your option) any later version.
|
|
*/
|
|
|
|
|
|
#include <stdint.h>
|
|
#include <avr/io.h>
|
|
|
|
#include "io.h"
|
|
#include "spi.h"
|
|
|
|
|
|
#define nSS B, 2
|
|
#define MOSI B, 3
|
|
#define MISO B, 4
|
|
#define SCLK B, 8
|
|
|
|
|
|
void spi_init(void)
|
|
{
|
|
/* Enable, SPI mode 0, master, MSB first, fosc/4 */
|
|
SPCR = (1 << SPE) | (1 << MSTR);
|
|
}
|
|
|
|
|
|
void spi_begin(void)
|
|
{
|
|
CLR(nSS);
|
|
}
|
|
|
|
|
|
uint8_t spi_io(uint8_t v)
|
|
{
|
|
SPDR = v;
|
|
while (!(SPSR & (1 << SPIF)));
|
|
return SPDR;
|
|
}
|
|
|
|
|
|
void spi_end(void)
|
|
{
|
|
SET(nSS);
|
|
}
|