143 lines
4 KiB
C
143 lines
4 KiB
C
/*
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Copyright (C) 2014..2017 Marco Veeneman
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "ch.h"
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#include "hal.h"
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/*
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* SPI TX and RX buffers.
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*/
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static uint8_t txbuf[512];
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static uint8_t rxbuf[512];
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/*
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* High speed SPI configuration (5MHZ, CPHA=0, CPOL=0).
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*/
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static const SPIConfig hs_spicfg =
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{
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NULL,
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GPIOA,
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3,
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SSI_CR0_DSS_8 | /*SSI_CR0_SPH | SSI_CR0_SPO |*/ SSI_CR0_SCR(0),
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16
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};
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/*
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* Low speed SPI configuration (1MHz, CPHA=0, CPOL=0).
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*/
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static const SPIConfig ls_spicfg =
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{
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NULL,
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GPIOA,
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3,
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SSI_CR0_DSS_8 | /*SSI_CR0_SPH | SSI_CR0_SPO |*/ SSI_CR0_SCR(0),
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80
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};
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/*
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* SPI bus contender 1.
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*/
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static THD_WORKING_AREA(spi_thread_1_wa, 256);
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static THD_FUNCTION(spi_thread_1, p)
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{
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(void)p;
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chRegSetThreadName("SPI thread 1");
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while (TRUE) {
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spiAcquireBus(&SPID1); /* Acquire ownership of the bus. */
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palSetPad(GPIOF, GPIOF_LED_GREEN); /* LED ON. */
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spiStart(&SPID1, &hs_spicfg); /* Setup transfer parameters. */
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spiSelect(&SPID1); /* Slave Select assertion. */
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spiExchange(&SPID1, 512,
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txbuf, rxbuf); /* Atomic transfer operations. */
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spiUnselect(&SPID1); /* Slave Select de-assertion. */
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spiReleaseBus(&SPID1); /* Ownership release. */
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}
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}
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/*
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* SPI bus contender 2.
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*/
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static THD_WORKING_AREA(spi_thread_2_wa, 256);
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static THD_FUNCTION(spi_thread_2, p)
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{
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(void)p;
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chRegSetThreadName("SPI thread 2");
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while (TRUE) {
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spiAcquireBus(&SPID1); /* Acquire ownership of the bus. */
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palClearPad(GPIOF, GPIOF_LED_GREEN);/* LED OFF. */
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spiStart(&SPID1, &ls_spicfg); /* Setup transfer parameters. */
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spiSelect(&SPID1); /* Slave Select assertion. */
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spiExchange(&SPID1, 512,
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txbuf, rxbuf); /* Atomic transfer operations. */
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spiUnselect(&SPID1); /* Slave Select de-assertion. */
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spiReleaseBus(&SPID1); /* Ownership release. */
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}
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}
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/*
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* Application entry point.
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*/
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int main(void)
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{
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size_t i;
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/*
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* System initializations.
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* - HAL initialization, this also initializes the configured device drivers
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* and performs the board-specific initializations.
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* - Kernel initialization, the main() function becomes a thread and the
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* RTOS is active.
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*/
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halInit();
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chSysInit();
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palSetLineMode(LINE_SSI0_CLK, PAL_MODE_OUTPUT_PUSHPULL | PAL_MODE_ALTERNATE(2));
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palSetLineMode(LINE_SSI0_RX, PAL_MODE_OUTPUT_PUSHPULL | PAL_MODE_ALTERNATE(2));
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palSetLineMode(LINE_SSI0_TX, PAL_MODE_OUTPUT_PUSHPULL | PAL_MODE_ALTERNATE(2));
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palSetLineMode(LINE_LED_GREEN, PAL_MODE_OUTPUT_PUSHPULL);
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palSetPadMode(GPIOA, GPIOA_PIN3, PAL_MODE_OUTPUT_PUSHPULL);
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/*
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* Prepare transmit pattern.
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*/
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for (i = 0; i < sizeof(txbuf); i++) {
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txbuf[i] = (uint8_t)i;
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}
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/*
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* Starting the transmitter and receiver threads.
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*/
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chThdCreateStatic(spi_thread_1_wa,
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sizeof(spi_thread_1_wa),
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NORMALPRIO + 1,
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spi_thread_1,
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NULL);
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chThdCreateStatic(spi_thread_2_wa,
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sizeof(spi_thread_2_wa),
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NORMALPRIO + 1,
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spi_thread_2,
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NULL);
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/*
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* Normal main() thread activity
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*/
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while (TRUE) {
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chThdSleepMilliseconds(500);
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}
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return 0;
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}
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