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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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,
GPIOA,
GPIOA_SPI1NSS,
0
};
/*
* Low speed SPI configuration (281.250KHz, CPHA=0, CPOL=0, MSb first).
*/
static const SPIConfig ls_spicfg = {
NULL,
GPIOA,
GPIOA_SPI1NSS,
SPI_CR1_BR_2 | SPI_CR1_BR_1
};
/*
* 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;
while (TRUE) {
spiAcquireBus(&SPID1); /* Acquire ownership of the bus. */
palClearPad(IOPORT3, GPIOC_LED); /* LED ON. */
spiStart(&SPID1, &hs_spicfg); /* Setup transfer parameters. */
spiSelect(&SPID1); /* Slave Select assertion. */
spiExchangeWait(&SPID1, 512,
txbuf, rxbuf); /* Atomic transfer operations. */
spiUnselect(&SPID1); /* Slave Select de-assertion. */
spiReleaseBus(&SPID1); /* 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;
while (TRUE) {
spiAcquireBus(&SPID1); /* Acquire ownership of the bus. */
palSetPad(IOPORT3, GPIOC_LED); /* LED OFF. */
spiStart(&SPID1, &ls_spicfg); /* Setup transfer parameters. */
spiSelect(&SPID1); /* Slave Select assertion. */
spiExchangeWait(&SPID1, 512,
txbuf, rxbuf); /* Atomic transfer operations. */
spiUnselect(&SPID1); /* Slave Select de-assertion. */
spiReleaseBus(&SPID1); /* Ownership release. */
}
return 0;
}
/*
* Entry point, note, the main() function is already a thread in the system
* on entry.
*/
int main(int argc, char **argv) {
unsigned i;
(void)argc;
(void)argv;
/*
* 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);
/*
* 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);
/*
* Normal main() thread activity, in this demo it does nothing.
*/
while (TRUE) {
chThdSleepMilliseconds(500);
}
return 0;
}
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