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libraries/SPI: Add support for peripheral mode.#200

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Merged
facchinm merged 1 commit intoarduino:mainfromiabdalkader:spi_controller_mode
Oct 2, 2025
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100 changes: 44 additions & 56 deletionslibraries/SPI/SPI.cpp
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Original file line numberDiff line numberDiff line change
Expand Up@@ -12,66 +12,42 @@ arduino::ZephyrSPI::ZephyrSPI(const struct device *spi) : spi_dev(spi) {
}

uint8_tarduino::ZephyrSPI::transfer(uint8_t data) {
int ret;
uint8_t rx;
conststructspi_buf tx_buf = {.buf = &data, .len =sizeof(data)};
conststructspi_buf_set tx_buf_set = {
.buffers = &tx_buf,
.count =1,
};
conststructspi_buf rx_buf = {.buf = &rx, .len =sizeof(rx)};
conststructspi_buf_set rx_buf_set = {
.buffers = &rx_buf,
.count =1,
};

ret =spi_transceive(spi_dev, &config, &tx_buf_set, &rx_buf_set);
if (ret <0) {
uint8_t rx = data;
if (transfer(&rx,sizeof(rx), &config) <0) {
return0;
}

return rx;
}

uint16_tarduino::ZephyrSPI::transfer16(uint16_t data) {
int ret;
uint16_t rx;
conststructspi_buf tx_buf = {.buf = &data, .len =sizeof(data)};
conststructspi_buf_set tx_buf_set = {
.buffers = &tx_buf,
.count =1,
};
conststructspi_buf rx_buf = {.buf = &rx, .len =sizeof(rx)};
conststructspi_buf_set rx_buf_set = {
.buffers = &rx_buf,
.count =1,
};

ret =spi_transceive(spi_dev, &config16, &tx_buf_set, &rx_buf_set);
if (ret <0) {
uint16_t rx = data;
if (transfer(&rx,sizeof(rx), &config16) <0) {
return0;
}

return rx;
}

voidarduino::ZephyrSPI::transfer(void *buf,size_t count) {
int ret =transfer(buf, count, &config);
(void)ret;
}

intarduino::ZephyrSPI::transfer(void *buf,size_t len,conststructspi_config *config) {
int ret;
conststructspi_buf tx_buf = {.buf = buf, .len = count};

conststructspi_buf tx_buf = {.buf = buf, .len = len};
conststructspi_buf_set tx_buf_set = {
.buffers = &tx_buf,
.count =1,
};

uint8_t rx[count];
conststructspi_buf rx_buf = {.buf = &rx, .len = count};
conststructspi_buf rx_buf = {.buf = buf, .len = len};
conststructspi_buf_set rx_buf_set = {
.buffers = &rx_buf,
.count =1,
};

spi_transceive(spi_dev, &config, &tx_buf_set, &rx_buf_set);
memcpy(buf, rx, count);
returnspi_transceive(spi_dev, config, &tx_buf_set, &rx_buf_set);
}

voidarduino::ZephyrSPI::usingInterrupt(int interruptNumber) {
Expand All@@ -80,21 +56,31 @@ void arduino::ZephyrSPI::usingInterrupt(int interruptNumber) {
voidarduino::ZephyrSPI::notUsingInterrupt(int interruptNumber) {
}

#ifndef SPI_MIN_CLOCK_FEQUENCY
#defineSPI_MIN_CLOCK_FEQUENCY1000000
#endif

voidarduino::ZephyrSPI::beginTransaction(SPISettings settings) {
memset(&config,0,sizeof(config));
memset(&config16,0,sizeof(config16));
config.frequency = settings.getClockFreq() > SPI_MIN_CLOCK_FEQUENCY ? settings.getClockFreq() :
SPI_MIN_CLOCK_FEQUENCY;
config16.frequency = config.frequency;
uint32_t mode =0;

// Set bus mode
switch (settings.getBusMode()) {
case SPI_CONTROLLER:
break;
case SPI_PERIPHERAL:
mode |= SPI_OP_MODE_SLAVE;
break;
}

auto mode = SPI_MODE_CPOL | SPI_MODE_CPHA;
// Set data format
switch (settings.getBitOrder()) {
case LSBFIRST:
mode |= SPI_TRANSFER_LSB;
break;
case MSBFIRST:
mode |= SPI_TRANSFER_MSB;
break;
}

// Set data mode
switch (settings.getDataMode()) {
case SPI_MODE0:
mode =0;
break;
case SPI_MODE1:
mode = SPI_MODE_CPHA;
Expand All@@ -106,12 +92,16 @@ void arduino::ZephyrSPI::beginTransaction(SPISettings settings) {
mode = SPI_MODE_CPOL | SPI_MODE_CPHA;
break;
}
config.operation =SPI_WORD_SET(8) |
(settings.getBitOrder() == MSBFIRST ? SPI_TRANSFER_MSB : SPI_TRANSFER_LSB) |
mode;
config16.operation =
SPI_WORD_SET(16) |
(settings.getBitOrder() == MSBFIRST ? SPI_TRANSFER_MSB : SPI_TRANSFER_LSB) | mode;

// Set SPI configuration structure for 8-bit transfers
memset(&config,0,sizeof(structspi_config));
config.operation = mode |SPI_WORD_SET(8);
config.frequency =max(SPI_MIN_CLOCK_FEQUENCY, settings.getClockFreq());

// Set SPI configuration structure for 16-bit transfers
memset(&config16,0,sizeof(structspi_config));
config16.operation = mode |SPI_WORD_SET(16);
config16.frequency =max(SPI_MIN_CLOCK_FEQUENCY, settings.getClockFreq());
}

voidarduino::ZephyrSPI::endTransaction(void) {
Expand All@@ -125,8 +115,6 @@ void arduino::ZephyrSPI::detachInterrupt() {
}

voidarduino::ZephyrSPI::begin() {
beginTransaction(SPISettings());
endTransaction();
}

voidarduino::ZephyrSPI::end() {
Expand Down
11 changes: 11 additions & 0 deletionslibraries/SPI/SPI.h
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Original file line numberDiff line numberDiff line change
Expand Up@@ -22,6 +22,14 @@
#define SPE 6
#define SPIE 7

#define SPI_HAS_PERIPHERAL_MODE (1)

// TODO:
// This depends on the clock settings, can't be used for all boards.
#ifndef SPI_MIN_CLOCK_FEQUENCY
#define SPI_MIN_CLOCK_FEQUENCY 1000000
#endif

/* Count the number of GPIOs for limit of number of interrupts */
#define INTERRUPT_HELPER(n, p, i) 1
#define INTERRUPT_COUNT \
Expand DownExpand Up@@ -50,6 +58,9 @@ class ZephyrSPI : public HardwareSPI {
virtual void begin();
virtual void end();

private:
int transfer(void *buf, size_t len, const struct spi_config *config);

protected:
const struct device *spi_dev;
struct spi_config config;
Expand Down
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