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/* 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;
}
uint16_t roundedDivisor = 2;
while (roundedDivisor < divisor) {
roundedDivisor <<= 1;
}
if (roundedDivisor < 2 || roundedDivisor > 256) {
return false;
}
#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;
}
#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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