186 lines
8 KiB
C
186 lines
8 KiB
C
/*
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* Contiki PIC32 Port project
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*
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* Copyright (c) 2012,
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* Scuola Superiore Sant'Anna (http://www.sssup.it) and
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* Consorzio Nazionale Interuniversitario per le Telecomunicazioni
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* (http://www.cnit.it).
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*
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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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*/
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/**
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* \addtogroup pic32 PIC32 Contiki Port
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*
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* @{
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*/
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/**
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* \file pic32_spi.c
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* \brief SPI interface for PIC32MX (pic32mx795f512l)
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* \author Giovanni Pellerano <giovanni.pellerano@evilaliv3.org>
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* \date 2012-03-21
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*/
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/*
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* PIC32MX795F512L - Specific Functions
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*
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* All the functions in this part of the file are specific for the
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* pic32mx795f512l that is characterized by registers' name that differ from
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* the 3xx and 4xx families of the pic32mx.
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*/
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#define __SPI_CODE_TEST__ 0
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#if __SPI_CODE_TEST__
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#define __USE_SPI__ 1
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#define __USE_SPI_PORT1__ 1
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#define __USE_SPI_PORT1A__ 1
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#define __USE_SPI_PORT2A__ 1
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#define __USE_SPI_PORT3A__ 1
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#endif /* __SPI_CODE_TEST__ */
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#ifdef __USE_SPI__
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#include <pic32_spi.h>
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#include <pic32_clock.h>
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#include <pic32_irq.h>
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#include <p32xxxx.h>
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/*
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* PIC32MX795F512L - Specific Functions
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*
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* All the functions in this part of the file are specific for the
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* pic32mx795f512l that is characterized by registers' name that differ from
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* the 3xx and 4xx families of the pic32mx.
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*/
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#define IS_MASTER(flags) ((flags) & SPI_MASTER)
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/*---------------------------------------------------------------------------*/
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#define SPI_PORT(XX, YY) \
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int8_t \
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pic32_spi##XX##_init(uint32_t baudrate, uint32_t flags) \
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{ \
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\
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IEC##YY##CLR = _IEC##YY##_SPI##XX##EIE_MASK | \
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_IEC##YY##_SPI##XX##TXIE_MASK | \
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_IEC##YY##_SPI##XX##RXIE_MASK; \
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\
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IFS##YY##CLR = _IFS##YY##_SPI##XX##EIF_MASK | \
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_IFS##YY##_SPI##XX##TXIF_MASK | \
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_IFS##YY##_SPI##XX##RXIF_MASK; \
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\
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SPI##XX##BRG = pic32_clock_calculate_brg(2, baudrate); \
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\
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SPI##XX##CON = 0; \
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\
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/* Flag parsing */ \
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\
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if(!IS_MASTER(flags)) { \
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return -SPI_ERR_UNIMPLEMENTED; \
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} \
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\
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SPI##XX##CON = flags | _SPI##XX##CON_ON_MASK; \
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\
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return SPI_NO_ERRORS; \
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} \
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\
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int8_t \
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pic32_spi##XX##_close() \
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{ \
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SPI##XX##CONCLR = _SPI##XX##CON_ON_MASK; \
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return SPI_NO_ERRORS; \
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} \
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\
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int8_t \
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pic32_spi##XX##_write(const uint8_t *data, uint32_t len) \
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{ \
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uint32_t i; \
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uint32_t dummy; \
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\
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for(i = 0; i < len; ++i) { \
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SPI##XX##STATCLR = _SPI##XX##STAT_SPIROV_MASK; \
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while(!SPI##XX##STATbits.SPITBE) { \
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; \
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} \
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ASM_DIS_INT; /* fix errata 44 */ \
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SPI##XX##BUF = data[i]; \
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ASM_EN_INT; /* fix errata 44 */ \
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while(!SPI##XX##STATbits.SPIRBF) { \
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; \
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} \
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SPI##XX##STATCLR = _SPI##XX##STAT_SPIROV_MASK; \
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dummy = SPI##XX##BUF; \
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} \
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\
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return SPI_NO_ERRORS; \
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} \
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\
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int8_t \
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pic32_spi##XX##_read(uint8_t *data, uint32_t len) \
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{ \
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uint32_t i; \
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\
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for(i = 0; i < len; ++i) { \
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SPI##XX##STATCLR = _SPI##XX##STAT_SPIROV_MASK; \
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while(!SPI##XX##STATbits.SPITBE) { \
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; \
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} \
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SPI##XX##BUF = 0; \
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while(!SPI##XX##STATbits.SPIRBF) { \
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; \
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} \
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SPI##XX##STATCLR = _SPI##XX##STAT_SPIROV_MASK; \
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data[i] = SPI##XX##BUF & 0x00FF; \
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} \
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\
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return SPI_NO_ERRORS; \
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}
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/*---------------------------------------------------------------------------*/
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#ifdef __USE_SPI_PORT1__
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SPI_PORT(1, 0)
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#endif /* __USE_SPI_PORT1__ */
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#ifdef __USE_SPI_PORT1A__
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SPI_PORT(1A, 0)
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#endif /* __USE_SPI_PORT1A__ */
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#ifdef __USE_SPI_PORT2A__
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SPI_PORT(2A, 1)
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#endif /* __USE_SPI_PORT2A__ */
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#ifdef __USE_SPI_PORT3A__
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SPI_PORT(3A, 1)
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#endif /* __USE_SPI_PORT3A__ */
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#endif /* __USE_SPI__ */
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/** @} */
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