contiki/platform/msb430/dev/sd-arch.c

95 lines
2.4 KiB
C

/*
* Copyright (c) 2009, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* Architecture-dependent functions for SD over SPI.
* \author
* Nicolas Tsiftes <nvt@sics.se>
*/
#include "contiki.h"
#include "msb430-uart1.h"
#include "sd-arch.h"
#define SPI_IDLE 0xff
int
sd_arch_init(void)
{
P2SEL &= ~64;
P2DIR &= ~64;
P5SEL |= 14;
P5SEL &= ~1;
P5OUT |= 1;
P5DIR |= 13;
P5DIR &= ~2;
uart_set_speed(UART_MODE_SPI, 2, 0, 0);
return 0;
}
void
sd_arch_spi_write(int c)
{
UART_TX = c;
UART_WAIT_TXDONE();
}
void
sd_arch_spi_write_block(uint8_t *bytes, int amount)
{
int i;
volatile char dummy;
for(i = 0; i < amount; i++) {
UART_TX = bytes[i];
UART_WAIT_TXDONE();
UART_WAIT_RX();
dummy = UART_RX;
}
}
unsigned
sd_arch_spi_read(void)
{
if((U1IFG & URXIFG1) == 0) {
UART_TX = SPI_IDLE;
UART_WAIT_RX();
}
return UART_RX;
}