/*
    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/>.
*/

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

/*
 * Maximum speed SPI configuration (18MHz, CPHA=0, CPOL=0, MSb first).
 */
static const SPIConfig hs_spicfg = {
  NULL,
  GPIOB,
  12,
  0,
  SPI_CR2_DS_2 | SPI_CR2_DS_1 | SPI_CR2_DS_0
};

/*
 * Low speed SPI configuration (140.625kHz, CPHA=0, CPOL=0, MSb first).
 */
static const SPIConfig ls_spicfg = {
  NULL,
  GPIOB,
  12,
  SPI_CR1_BR_2 | SPI_CR1_BR_1,
  SPI_CR2_DS_2 | SPI_CR2_DS_1 | SPI_CR2_DS_0
};

/*
 * SPI TX and RX buffers.
 */
static uint8_t txbuf[512];
static uint8_t rxbuf[512];

/*
 * SPI bus contender 1.
 */
static WORKING_AREA(spi_thread_1_wa, 256);
static msg_t spi_thread_1(void *p) {

  (void)p;
  chRegSetThreadName("SPI thread 1");
  while (TRUE) {
    spiAcquireBus(&SPID2);              /* Acquire ownership of the bus.    */
    palSetPad(GPIOC, GPIOC_LED4);       /* LED ON.                          */
    spiStart(&SPID2, &hs_spicfg);       /* Setup transfer parameters.       */
    spiSelect(&SPID2);                  /* Slave Select assertion.          */
    spiExchange(&SPID2, 512,
                txbuf, rxbuf);          /* Atomic transfer operations.      */
    spiUnselect(&SPID2);                /* Slave Select de-assertion.       */
    spiReleaseBus(&SPID2);              /* Ownership release.               */
  }
  return 0;
}

/*
 * SPI bus contender 2.
 */
static WORKING_AREA(spi_thread_2_wa, 256);
static msg_t spi_thread_2(void *p) {

  (void)p;
  chRegSetThreadName("SPI thread 2");
  while (TRUE) {
    spiAcquireBus(&SPID2);              /* Acquire ownership of the bus.    */
    palClearPad(GPIOC, GPIOC_LED4);     /* LED OFF.                         */
    spiStart(&SPID2, &ls_spicfg);       /* Setup transfer parameters.       */
    spiSelect(&SPID2);                  /* Slave Select assertion.          */
    spiExchange(&SPID2, 512,
                txbuf, rxbuf);          /* Atomic transfer operations.      */
    spiUnselect(&SPID2);                /* Slave Select de-assertion.       */
    spiReleaseBus(&SPID2);              /* Ownership release.               */
  }
  return 0;
}
/*
 * This is a periodic thread that does absolutely nothing except flashing
 * a LED.
 */
static WORKING_AREA(blinker_wa, 128);
static msg_t blinker(void *arg) {

  (void)arg;
  chRegSetThreadName("blinker");
  while (TRUE) {
    palSetPad(GPIOC, GPIOC_LED3);
    chThdSleepMilliseconds(500);
    palClearPad(GPIOC, GPIOC_LED3);
    chThdSleepMilliseconds(500);
  }
}

/*
 * Application entry point.
 */
int main(void) {
  unsigned i;

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();

  /*
   * SPI2 I/O pins setup.
   */
  palSetPadMode(GPIOB, 13, PAL_MODE_ALTERNATE(0) |
                           PAL_STM32_OSPEED_HIGHEST);       /* New SCK.     */
  palSetPadMode(GPIOB, 14, PAL_MODE_ALTERNATE(0) |
                           PAL_STM32_OSPEED_HIGHEST);       /* New MISO.    */
  palSetPadMode(GPIOB, 15, PAL_MODE_ALTERNATE(0) |
                           PAL_STM32_OSPEED_HIGHEST);       /* New MOSI.    */
  palSetPad(GPIOB, 12);
  palSetPadMode(GPIOB, 12, PAL_MODE_OUTPUT_PUSHPULL |
                           PAL_STM32_OSPEED_HIGHEST);       /* New CS.      */

  /*
   * Prepare transmit pattern.
   */
  for (i = 0; i < sizeof(txbuf); i++)
    txbuf[i] = (uint8_t)i;

  /*
   * Starting the transmitter and receiver threads.
   */
  chThdCreateStatic(spi_thread_1_wa, sizeof(spi_thread_1_wa),
                    NORMALPRIO + 1, spi_thread_1, NULL);
  chThdCreateStatic(spi_thread_2_wa, sizeof(spi_thread_2_wa),
                    NORMALPRIO + 1, spi_thread_2, NULL);

  /*
   * Starting the blinker thread.
   */
  chThdCreateStatic(blinker_wa, sizeof(blinker_wa),
                    NORMALPRIO-1, blinker, NULL);

  /*
   * Normal main() thread activity, in this demo it does nothing.
   */
  while (TRUE) {
    chThdSleepMilliseconds(500);
  }
  return 0;
}