mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-12-26 11:08:52 +06:00
138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/* 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) {
|
|
// 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;
|
|
}
|
|
}
|