fc_spi.c

/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

                                      ---

    A special exception to the GPL can be applied should you wish to distribute
    a combined work that includes ChibiOS/RT, without being obliged to provide
    the source code for any proprietary components. See the file exception.txt
    for full details of how and when the exception can be applied.
*/

#include "ch.h"
#include "hal.h"

#include "fc_spi.h"

#include <string.h>

/*
 * Mutex to lock output buffer
 */
static Mutex					SPIMtx; /* Mutex */

/*
 * SPI TX and RX buffers.
 */
//#define		SPI_BUF_SIZE 128
//static char txbuf[SPI_BUF_SIZE];
//static char rxbuf[SPI_BUF_SIZE];

/*
 * Maximum speed SPI configuration (18MHz, CPHA=0, CPOL=0, MSb first).
 */
static const SPIConfig hs_spicfg = {
	NULL,
	GPIOA,
	GPIOA_SPI1NSS,
	0
};

/*
 * Initialize the SPI interface
 */
void SPIInit(void)
{
	/*
	 * SPI1 I/O pins setup.
	 */
	palSetPadMode(IOPORT1, 5, PAL_MODE_STM32_ALTERNATE_PUSHPULL);     /* SCK. */
	palSetPadMode(IOPORT1, 6, PAL_MODE_STM32_ALTERNATE_PUSHPULL);     /* MISO.*/
	palSetPadMode(IOPORT1, 7, PAL_MODE_STM32_ALTERNATE_PUSHPULL);     /* MOSI.*/
	palSetPadMode(IOPORT1, GPIOA_SPI1NSS, PAL_MODE_OUTPUT_PUSHPULL);
	palSetPad(IOPORT1, GPIOA_SPI1NSS);

	/*
	 * Initialize Mutex
	 */
	chMtxInit(&SPIMtx); /* Mutex initialization before use */
}

/*
 * SPI bus exchange routine
 */
int SPIExchangeData(SPIDriver *spip, uint8_t *tx, uint8_t *rx, size_t size) {

	chMtxLock(&SPIMtx);

	/*
	 * Do exchange between device and MCU.
	 */
	spiAcquireBus(spip);              /* Acquire ownership of the bus.    */
	spiStart(spip, &hs_spicfg);       /* Setup transfer parameters.       */
	spiSelect(spip);                  /* Slave Select assertion.          */
	spiExchange(spip, size, tx, rx);  /* Atomic transfer operations.      */
	spiUnselect(spip);                /* Slave Select de-assertion.       */
	spiReleaseBus(spip);              /* Ownership release.               */
	chMtxUnlock();

	return 0;
}

/*
 * SPI bus exchange routine
 */
int SPIExchangeDataI(SPIDriver *spip, uint8_t *tx, uint8_t *rx, size_t size) {
	//chMtxLock(&SPIMtx);

	/*
	 * Do exchange between device and MCU.
	 */
	//spiAcquireBus(spip);              /* Acquire ownership of the bus.    */
	//spiSelectI(spip);                  /* Slave Select assertion.          */
	spiStartExchangeI(spip, size, tx, rx);  /* Atomic transfer operations.      */
	//spiUnselectI(spip);                /* Slave Select de-assertion.       */
	//spiReleaseBus(spip);              /* Ownership release.               */
	//chMtxUnlock();

	return 0;
}

/*
 * SPI bus send routine
 */
int SPISendData(SPIDriver *spip, uint8_t *tx, size_t size) {

	chMtxLock(&SPIMtx);

	/*
	 * Do exchange between device and MCU.
	 */
	spiAcquireBus(spip);              /* Acquire ownership of the bus.    */
	spiStart(spip, &hs_spicfg);       /* Setup transfer parameters.       */
	spiSelect(spip);                  /* Slave Select assertion.          */
	spiSend(spip, size, tx);					/* Send command											*/
	spiUnselect(spip);                /* Slave Select de-assertion.       */
	spiStop(spip);
	spiReleaseBus(spip);              /* Ownership release.               */
	chMtxUnlock();

	return 0;
}

/*
 * SPI bus receive routine
 */
int SPIReceiveData(SPIDriver *spip, uint8_t *rx, size_t size) {

	chMtxLock(&SPIMtx);

	/*
	 * Do exchange between device and MCU.
	 */
	spiAcquireBus(spip);              /* Acquire ownership of the bus.    */
	spiStart(spip, &hs_spicfg);       /* Setup transfer parameters.       */
	spiSelect(spip);                  /* Slave Select assertion.          */
	spiReceive(spip, size, rx);
	spiUnselect(spip);                /* Slave Select de-assertion.       */
	spiReleaseBus(spip);              /* Ownership release.               */
	chMtxUnlock();

	return 0;
}