148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
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/*
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Copyright 2007, Freie Universitaet Berlin. All rights reserved.
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These sources were developed at the Freie Universität Berlin, Computer
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Systems and Telematics group.
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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 are
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met:
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- 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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- 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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- Neither the name of Freie Universitaet Berlin (FUB) nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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This software is provided by FUB and the contributors on an "as is"
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basis, without any representations or warranties of any kind, express
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or implied including, but not limited to, representations or
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warranties of non-infringement, merchantability or fitness for a
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particular purpose. In no event shall FUB or contributors be liable
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for any direct, indirect, incidental, special, exemplary, or
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consequential damages (including, but not limited to, procurement of
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substitute goods or services; loss of use, data, or profits; or
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business interruption) however caused and on any theory of liability,
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whether in contract, strict liability, or tort (including negligence
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or otherwise) arising in any way out of the use of this software, even
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if advised of the possibility of such damage.
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This implementation was developed by the CST group at the FUB.
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For documentation and questions please use the web site
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http://scatterweb.mi.fu-berlin.de and the mailinglist
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scatterweb@lists.spline.inf.fu-berlin.de (subscription via the Website).
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Berlin, 2007
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*/
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/**
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* @file ScatterWeb.Spi.c
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* @ingroup libsdspi
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* @brief Serial Peripheral Interface for SD library
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*
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* @author Michael Baar <baar@inf.fu-berlin.de>
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* @date 2007
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* @version 1.0
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*/
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#include <io.h>
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#include <signal.h>
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#include <string.h>
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#include "contiki-msb430.h"
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#define SPI_IDLE_SYMBOL 0xFF
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void
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spi_init(void)
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{
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/* The 16-bit value of UxBR0+UxBR1 is the division factor of the USART clock
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* source, BRCLK. The maximum baud rate that can be generated in master
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* mode is BRCLK/2. The maximum baud rate that can be generated in slave
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* mode is BRCLK. The modulator in the USART baud rate generator is not used
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* for SPI mode and is recommended to be set to 000h. The UCLK frequency is
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* given by:
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* Baud rate = BRCLK / UxBR with UxBR= [UxBR1, UxBR0]
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*/
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uart_set_speed(UART_MODE_SPI, 0x02, 0x00, 0x00);
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}
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uint8_t_t
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spi_rx(void)
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{
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UART_RESET_RX();
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UART_TX = SPI_IDLE_SYMBOL;
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UART_WAIT_RX();
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return (UART_RX);
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}
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void
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spi_tx(register const uint8_t_t c)
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{
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UART_RESET_RX();
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UART_TX = c;
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UART_WAIT_RX();
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}
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void
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spi_read(void *pDestination, const uint16_t size, const bool incDest)
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{
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register uint8_t *p = (uint8_t *) pDestination;
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register uint16_t i;
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for (i = size; i > 0; i--) {
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*p = spi_rx();
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if (incDest)
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p++;
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}
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}
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void
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spi_write(const void *pSource, const uint16_t size, const uint8_t startToken,
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const bool incSource)
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{
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register unsigned char *p = (unsigned char *) pSource;
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register uint16_t i;
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spi_tx(startToken);
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for (i = size; i > 0; i--) {
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spi_tx(*p);
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if (incSource)
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p++;
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}
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}
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void
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spi_idle(register const uint16_t clocks)
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{
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register uint16_t i;
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for (i = 0; i < clocks; i++) {
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UART_RESET_RX();
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UART_TX = SPI_IDLE_SYMBOL;
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UART_WAIT_RX();
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}
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}
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bool
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spi_wait_token(const uint8_t token, const uint16_t timeout)
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{
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uint16_t i;
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uint8_t rx;
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for (i = 0; i < timeout; i++) {
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rx = spi_rx();
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if (rx == token)
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return TRUE;
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}
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return FALSE;
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}
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