- /* Copyright 2020 Nick Brassel (tzarc)
- *
- * This program 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.
- *
- * This program 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 <https://www.gnu.org/licenses/>.
- */
-
- #include "spi_master.h"
- #include "quantum.h"
- #include "timer.h"
-
- static pin_t currentSlavePin = NO_PIN;
- static SPIConfig spiConfig = {false, NULL, 0, 0, 0, 0};
-
- __attribute__((weak)) void spi_init(void) {
- static bool is_initialised = false;
- if (!is_initialised) {
- is_initialised = true;
-
- // Try releasing special pins for a short time
- palSetPadMode(PAL_PORT(SPI_SCK_PIN), PAL_PAD(SPI_SCK_PIN), PAL_MODE_INPUT);
- palSetPadMode(PAL_PORT(SPI_MOSI_PIN), PAL_PAD(SPI_MOSI_PIN), PAL_MODE_INPUT);
- palSetPadMode(PAL_PORT(SPI_MISO_PIN), PAL_PAD(SPI_MISO_PIN), PAL_MODE_INPUT);
-
- chThdSleepMilliseconds(10);
- #if defined(USE_GPIOV1)
- palSetPadMode(PAL_PORT(SPI_SCK_PIN), PAL_PAD(SPI_SCK_PIN), PAL_MODE_STM32_ALTERNATE_PUSHPULL);
- palSetPadMode(PAL_PORT(SPI_MOSI_PIN), PAL_PAD(SPI_MOSI_PIN), PAL_MODE_STM32_ALTERNATE_PUSHPULL);
- palSetPadMode(PAL_PORT(SPI_MISO_PIN), PAL_PAD(SPI_MISO_PIN), PAL_MODE_STM32_ALTERNATE_PUSHPULL);
- #else
- palSetPadMode(PAL_PORT(SPI_SCK_PIN), PAL_PAD(SPI_SCK_PIN), PAL_MODE_ALTERNATE(SPI_SCK_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
- palSetPadMode(PAL_PORT(SPI_MOSI_PIN), PAL_PAD(SPI_MOSI_PIN), PAL_MODE_ALTERNATE(SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
- palSetPadMode(PAL_PORT(SPI_MISO_PIN), PAL_PAD(SPI_MISO_PIN), PAL_MODE_ALTERNATE(SPI_MISO_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL | PAL_STM32_OSPEED_HIGHEST);
- #endif
- }
- }
-
- bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
- if (currentSlavePin != NO_PIN || slavePin == NO_PIN) {
- return false;
- }
-
- uint16_t roundedDivisor = 2;
- while (roundedDivisor < divisor) {
- roundedDivisor <<= 1;
- }
-
- if (roundedDivisor < 2 || roundedDivisor > 256) {
- return false;
- }
-
- spiConfig.cr1 = 0;
-
- if (lsbFirst) {
- spiConfig.cr1 |= SPI_CR1_LSBFIRST;
- }
-
- switch (mode) {
- case 0:
- break;
- case 1:
- spiConfig.cr1 |= SPI_CR1_CPHA;
- break;
- case 2:
- spiConfig.cr1 |= SPI_CR1_CPOL;
- break;
- case 3:
- spiConfig.cr1 |= SPI_CR1_CPHA | SPI_CR1_CPOL;
- break;
- }
-
- switch (roundedDivisor) {
- case 2:
- break;
- case 4:
- spiConfig.cr1 |= SPI_CR1_BR_0;
- break;
- case 8:
- spiConfig.cr1 |= SPI_CR1_BR_1;
- break;
- case 16:
- spiConfig.cr1 |= SPI_CR1_BR_1 | SPI_CR1_BR_0;
- break;
- case 32:
- spiConfig.cr1 |= SPI_CR1_BR_2;
- break;
- case 64:
- spiConfig.cr1 |= SPI_CR1_BR_2 | SPI_CR1_BR_0;
- break;
- case 128:
- spiConfig.cr1 |= SPI_CR1_BR_2 | SPI_CR1_BR_1;
- break;
- case 256:
- spiConfig.cr1 |= SPI_CR1_BR_2 | SPI_CR1_BR_1 | SPI_CR1_BR_0;
- break;
- }
-
- currentSlavePin = slavePin;
- spiConfig.ssport = PAL_PORT(slavePin);
- spiConfig.sspad = PAL_PAD(slavePin);
-
- setPinOutput(slavePin);
- spiStart(&SPI_DRIVER, &spiConfig);
- spiSelect(&SPI_DRIVER);
-
- return true;
- }
-
- spi_status_t spi_write(uint8_t data) { return spi_transmit(&data, 1); }
-
- spi_status_t spi_read(void) {
- uint8_t data = 0;
- spi_receive(&data, 1);
- return data;
- }
-
- spi_status_t spi_transmit(const uint8_t *data, uint16_t length) {
- spiSend(&SPI_DRIVER, length, data);
- return SPI_STATUS_SUCCESS;
- }
-
- spi_status_t spi_receive(uint8_t *data, uint16_t length) {
- spiReceive(&SPI_DRIVER, length, data);
- return SPI_STATUS_SUCCESS;
- }
-
- void spi_stop(void) {
- if (currentSlavePin != NO_PIN) {
- spiUnselect(&SPI_DRIVER);
- spiStop(&SPI_DRIVER);
- currentSlavePin = NO_PIN;
- }
- }
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