forked from forks/qmk_firmware
408d61dcfb
Co-authored-by: Sergey Vlasov <sigprof@gmail.com> Co-authored-by: Nick Brassel <nick@tzarc.org>
330 lines
9 KiB
C
330 lines
9 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 "timer.h"
|
|
|
|
static bool spiStarted = false;
|
|
|
|
#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
|
|
static pin_t currentSlavePin;
|
|
#endif
|
|
|
|
static SPIConfig spiConfig;
|
|
|
|
__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);
|
|
if (SPI_MOSI_PIN != NO_PIN) {
|
|
setPinInput(SPI_MOSI_PIN);
|
|
}
|
|
if (SPI_MISO_PIN != NO_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);
|
|
if (SPI_MOSI_PIN != NO_PIN) {
|
|
palSetPadMode(PAL_PORT(SPI_MOSI_PIN), PAL_PAD(SPI_MOSI_PIN), SPI_MOSI_PAL_MODE);
|
|
}
|
|
if (SPI_MISO_PIN != NO_PIN) {
|
|
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), SPI_SCK_FLAGS);
|
|
if (SPI_MOSI_PIN != NO_PIN) {
|
|
palSetPadMode(PAL_PORT(SPI_MOSI_PIN), PAL_PAD(SPI_MOSI_PIN), SPI_MOSI_FLAGS);
|
|
}
|
|
if (SPI_MISO_PIN != NO_PIN) {
|
|
palSetPadMode(PAL_PORT(SPI_MISO_PIN), PAL_PAD(SPI_MISO_PIN), SPI_MISO_FLAGS);
|
|
}
|
|
#endif
|
|
spiStop(&SPI_DRIVER);
|
|
spiStarted = false;
|
|
}
|
|
}
|
|
|
|
bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
|
|
if (spiStarted) {
|
|
return false;
|
|
}
|
|
#if SPI_SELECT_MODE != SPI_SELECT_MODE_NONE
|
|
if (slavePin == NO_PIN) {
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
#if !(defined(WB32F3G71xx) || defined(WB32FQ95xx))
|
|
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) || defined(WB32FQ95xx)
|
|
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;
|
|
}
|
|
#elif defined(MCU_RP)
|
|
if (lsbFirst) {
|
|
osalDbgAssert(lsbFirst == false, "RP2040s PrimeCell SPI implementation does not support sending LSB first.");
|
|
}
|
|
|
|
// Motorola frame format and 8bit transfer data size.
|
|
spiConfig.SSPCR0 = SPI_SSPCR0_FRF_MOTOROLA | SPI_SSPCR0_DSS_8BIT;
|
|
// Serial output clock = (ck_sys or ck_peri) / (SSPCPSR->CPSDVSR * (1 +
|
|
// SSPCR0->SCR)). SCR is always set to zero, as QMK SPI API expects the
|
|
// passed divisor to be the only value to divide the input clock by.
|
|
spiConfig.SSPCPSR = roundedDivisor; // Even number from 2 to 254
|
|
|
|
switch (mode) {
|
|
case 0:
|
|
spiConfig.SSPCR0 &= ~SPI_SSPCR0_SPO; // Clock polarity: low
|
|
spiConfig.SSPCR0 &= ~SPI_SSPCR0_SPH; // Clock phase: sample on first edge
|
|
break;
|
|
case 1:
|
|
spiConfig.SSPCR0 &= ~SPI_SSPCR0_SPO; // Clock polarity: low
|
|
spiConfig.SSPCR0 |= SPI_SSPCR0_SPH; // Clock phase: sample on second edge transition
|
|
break;
|
|
case 2:
|
|
spiConfig.SSPCR0 |= SPI_SSPCR0_SPO; // Clock polarity: high
|
|
spiConfig.SSPCR0 &= ~SPI_SSPCR0_SPH; // Clock phase: sample on first edge
|
|
break;
|
|
case 3:
|
|
spiConfig.SSPCR0 |= SPI_SSPCR0_SPO; // Clock polarity: high
|
|
spiConfig.SSPCR0 |= SPI_SSPCR0_SPH; // Clock phase: sample on second edge transition
|
|
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
|
|
|
|
spiStarted = true;
|
|
#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
|
|
currentSlavePin = slavePin;
|
|
#endif
|
|
#if SPI_SELECT_MODE == SPI_SELECT_MODE_PAD
|
|
spiConfig.ssport = PAL_PORT(slavePin);
|
|
spiConfig.sspad = PAL_PAD(slavePin);
|
|
setPinOutput(slavePin);
|
|
#elif SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
|
|
if (slavePin != NO_PIN) {
|
|
setPinOutput(slavePin);
|
|
}
|
|
#else
|
|
# error "Unsupported SPI_SELECT_MODE"
|
|
#endif
|
|
|
|
spiStart(&SPI_DRIVER, &spiConfig);
|
|
spiSelect(&SPI_DRIVER);
|
|
#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
|
|
if (slavePin != NO_PIN) {
|
|
writePinLow(slavePin);
|
|
}
|
|
#endif
|
|
|
|
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 (spiStarted) {
|
|
#if SPI_SELECT_MODE == SPI_SELECT_MODE_NONE
|
|
if (currentSlavePin != NO_PIN) {
|
|
writePinHigh(currentSlavePin);
|
|
}
|
|
#endif
|
|
spiUnselect(&SPI_DRIVER);
|
|
spiStop(&SPI_DRIVER);
|
|
spiStarted = false;
|
|
}
|
|
}
|