- /* 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 "timer.h"
-
- static pin_t currentSlavePin = NO_PIN;
-
- #if defined(K20x) || defined(KL2x)
- static SPIConfig spiConfig = {NULL, 0, 0, 0};
- #else
- static SPIConfig spiConfig = {false, NULL, 0, 0, 0, 0};
- #endif
-
- __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
- setPinInput(SPI_SCK_PIN);
- setPinInput(SPI_MOSI_PIN);
- setPinInput(SPI_MISO_PIN);
-
- chThdSleepMilliseconds(10);
- #if defined(USE_GPIOV1)
- palSetPadMode(PAL_PORT(SPI_SCK_PIN), PAL_PAD(SPI_SCK_PIN), SPI_SCK_PAL_MODE);
- palSetPadMode(PAL_PORT(SPI_MOSI_PIN), PAL_PAD(SPI_MOSI_PIN), SPI_MOSI_PAL_MODE);
- palSetPadMode(PAL_PORT(SPI_MISO_PIN), PAL_PAD(SPI_MISO_PIN), SPI_MISO_PAL_MODE);
- #else
- palSetPadMode(PAL_PORT(SPI_SCK_PIN), PAL_PAD(SPI_SCK_PIN), PAL_MODE_ALTERNATE(SPI_SCK_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL | PAL_OUTPUT_SPEED_HIGHEST);
- palSetPadMode(PAL_PORT(SPI_MOSI_PIN), PAL_PAD(SPI_MOSI_PIN), PAL_MODE_ALTERNATE(SPI_MOSI_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL | PAL_OUTPUT_SPEED_HIGHEST);
- palSetPadMode(PAL_PORT(SPI_MISO_PIN), PAL_PAD(SPI_MISO_PIN), PAL_MODE_ALTERNATE(SPI_MISO_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL | PAL_OUTPUT_SPEED_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;
- }
-
- #ifndef WB32F3G71xx
- uint16_t roundedDivisor = 2;
- while (roundedDivisor < divisor) {
- roundedDivisor <<= 1;
- }
-
- if (roundedDivisor < 2 || roundedDivisor > 256) {
- return false;
- }
- #endif
-
- #if defined(K20x) || defined(KL2x)
- spiConfig.tar0 = SPIx_CTARn_FMSZ(7) | SPIx_CTARn_ASC(1);
-
- if (lsbFirst) {
- spiConfig.tar0 |= SPIx_CTARn_LSBFE;
- }
-
- switch (mode) {
- case 0:
- break;
- case 1:
- spiConfig.tar0 |= SPIx_CTARn_CPHA;
- break;
- case 2:
- spiConfig.tar0 |= SPIx_CTARn_CPOL;
- break;
- case 3:
- spiConfig.tar0 |= SPIx_CTARn_CPHA | SPIx_CTARn_CPOL;
- break;
- }
-
- switch (roundedDivisor) {
- case 2:
- spiConfig.tar0 |= SPIx_CTARn_BR(0);
- break;
- case 4:
- spiConfig.tar0 |= SPIx_CTARn_BR(1);
- break;
- case 8:
- spiConfig.tar0 |= SPIx_CTARn_BR(3);
- break;
- case 16:
- spiConfig.tar0 |= SPIx_CTARn_BR(4);
- break;
- case 32:
- spiConfig.tar0 |= SPIx_CTARn_BR(5);
- break;
- case 64:
- spiConfig.tar0 |= SPIx_CTARn_BR(6);
- break;
- case 128:
- spiConfig.tar0 |= SPIx_CTARn_BR(7);
- break;
- case 256:
- spiConfig.tar0 |= SPIx_CTARn_BR(8);
- break;
- }
-
- #elif defined(HT32)
- spiConfig.cr0 = SPI_CR0_SELOEN;
- spiConfig.cr1 = SPI_CR1_MODE | 8; // 8 bits and in master mode
-
- if (lsbFirst) {
- spiConfig.cr1 |= SPI_CR1_FIRSTBIT;
- }
-
- switch (mode) {
- case 0:
- spiConfig.cr1 |= SPI_CR1_FORMAT_MODE0;
- break;
- case 1:
- spiConfig.cr1 |= SPI_CR1_FORMAT_MODE1;
- break;
- case 2:
- spiConfig.cr1 |= SPI_CR1_FORMAT_MODE2;
- break;
- case 3:
- spiConfig.cr1 |= SPI_CR1_FORMAT_MODE3;
- break;
- }
-
- spiConfig.cpr = (roundedDivisor - 1) >> 1;
-
- #elif defined(WB32F3G71xx)
- if (!lsbFirst) {
- osalDbgAssert(lsbFirst != FALSE, "unsupported lsbFirst");
- }
-
- if (divisor < 1) {
- return false;
- }
-
- spiConfig.SPI_BaudRatePrescaler = (divisor << 2);
-
- switch (mode) {
- case 0:
- spiConfig.SPI_CPHA = SPI_CPHA_1Edge;
- spiConfig.SPI_CPOL = SPI_CPOL_Low;
- break;
- case 1:
- spiConfig.SPI_CPHA = SPI_CPHA_2Edge;
- spiConfig.SPI_CPOL = SPI_CPOL_Low;
- break;
- case 2:
- spiConfig.SPI_CPHA = SPI_CPHA_1Edge;
- spiConfig.SPI_CPOL = SPI_CPOL_High;
- break;
- case 3:
- spiConfig.SPI_CPHA = SPI_CPHA_2Edge;
- spiConfig.SPI_CPOL = SPI_CPOL_High;
- break;
- }
-
- #else
- 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;
- }
- #endif
-
- 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) {
- uint8_t rxData;
- spiExchange(&SPI_DRIVER, 1, &data, &rxData);
-
- return rxData;
- }
-
- spi_status_t spi_read(void) {
- uint8_t data = 0;
- spiReceive(&SPI_DRIVER, 1, &data);
-
- 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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