9b4cd05e1f
calculation. Removed expensive modulo operations from sd_read and sd_write because the block size is now a variable. (nvt)
91 lines
2.3 KiB
C
Executable file
91 lines
2.3 KiB
C
Executable file
/*
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* Copyright (c) 2009, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Architecture-dependent functions for SD over SPI.
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* \author
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* Nicolas Tsiftes <nvt@sics.se>
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*/
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#include "contiki.h"
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#include "msb430-uart1.h"
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#include "sd-arch.h"
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#define SPI_IDLE 0xff
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int
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sd_arch_init(void)
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{
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P2SEL &= ~64;
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P2DIR &= ~64;
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P5SEL |= 14;
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P5SEL &= ~1;
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P5OUT |= 1;
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P5DIR |= 13;
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P5DIR &= ~2;
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uart_set_speed(UART_MODE_SPI, 2, 0, 0);
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return 0;
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}
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void
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sd_arch_spi_write(int c)
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{
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UART_TX = c;
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UART_WAIT_TXDONE();
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}
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void
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sd_arch_spi_write_block(uint8_t *bytes, int amount)
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{
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int i;
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for(i = 0; i < amount; i++) {
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UART_TX = bytes[i];
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UART_WAIT_TXDONE();
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UART_RX;
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}
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}
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unsigned
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sd_arch_spi_read(void)
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{
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UART_TX = SPI_IDLE;
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UART_WAIT_RX();
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return UART_RX;
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}
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