sd-arch.h

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00001 /*
00002  * Copyright (c) 2009, Swedish Institute of Computer Science
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  */
00032 
00033 /**
00034  * \file
00035  *      SD driver implementation using SPI.
00036  * \author
00037  *      Nicolas Tsiftes <nvt@sics.se>
00038  */
00039 
00040 #ifndef SD_ARCH_H
00041 #define SD_ARCH_H
00042 
00043 #include "msb430-uart1.h"
00044 
00045 #ifndef U1IFG
00046 #define U1IFG           IFG2
00047 #endif /* U1IFG */
00048 
00049 #define MS_DELAY(x) clock_delay(354 * (x))
00050 
00051 /* Machine-dependent macros. */
00052 #define LOCK_SPI()              do {                            \
00053                                   if(!uart_lock(UART_MODE_SPI)) {\
00054                                     return 0;                   \
00055                                   }                             \
00056                                 } while(0)
00057 #define UNLOCK_SPI()            do {                            \
00058                                   uart_unlock(UART_MODE_SPI);   \
00059                                 } while(0)
00060 
00061 #define SD_CONNECTED()          !(P2IN & 0x40)
00062 #define LOWER_CS()              (P5OUT &= ~0x01)
00063 #define RAISE_CS()              do {                            \
00064                                   UART_WAIT_TXDONE();           \
00065                                   P5OUT |= 0x01;                \
00066                                   UART_TX = SPI_IDLE;           \
00067                                   UART_WAIT_TXDONE();           \
00068                                 } while(0)
00069 
00070 /* Configuration parameters. */
00071 #define SD_TRANSACTION_ATTEMPTS         512
00072 #define SD_READ_RESPONSE_ATTEMPTS       8
00073 #define SD_READ_BLOCK_ATTEMPTS          2
00074 
00075 int sd_arch_init(void);
00076 void sd_arch_spi_write(int c);
00077 void sd_arch_spi_write_block(uint8_t *bytes, int amount);
00078 unsigned sd_arch_spi_read(void);
00079 
00080 #endif /* !SD_ARCH_H */