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/*
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;
}
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