ESP-IDF SPI not working but equivilant code working with arduino IDE code
Posted: Mon May 19, 2025 6:19 am
I have a ESP32-S3-DevkitC-1 and am trying to get spi running in master mode with spi pins assigned to the following GPIOs
#define PIN_NUM_MISO GPIO_NUM_9
#define PIN_NUM_MOSI GPIO_NUM_12
#define PIN_NUM_SCLK GPIO_NUM_11
#define PIN_NUM_nSCS GPIO_NUM_10
I have got this running with a simple arduino script (confirmed via oscilliscope) but my ESP-IDF implementation isnt working.
relevant code
i'm not seeing any output on any of the GPIOs, appreciate any ideas
#define PIN_NUM_MISO GPIO_NUM_9
#define PIN_NUM_MOSI GPIO_NUM_12
#define PIN_NUM_SCLK GPIO_NUM_11
#define PIN_NUM_nSCS GPIO_NUM_10
I have got this running with a simple arduino script (confirmed via oscilliscope) but my ESP-IDF implementation isnt working.
relevant code
Code: Select all
//SPI
#define PIN_NUM_MISO GPIO_NUM_9//13//11//9
#define PIN_NUM_MOSI GPIO_NUM_12//12//13//12
#define PIN_NUM_SCLK GPIO_NUM_11//15//12//11
#define PIN_NUM_nSCS GPIO_NUM_10//14//10//10
#define HOST SPI2_HOST
spi_device_handle_t spi;
void spi_setup(){
spi_bus_config_t spi_bus_config = {
.miso_io_num = PIN_NUM_MISO,
.mosi_io_num = PIN_NUM_MOSI,
.sclk_io_num = PIN_NUM_SCLK,
.flags = SPICOMMON_BUSFLAG_MASTER, | SPICOMMON_BUSFLAG_GPIO_PINS,
.max_transfer_sz = 32,
};
if(ESP_OK == spi_bus_initialize(HOST, &spi_bus_config, SPI_DMA_DISABLED)){
}
else{
}
spi_device_interface_config_t dev_config = {
.clock_speed_hz = 1000000,
.mode = 0,
.spics_io_num = PIN_NUM_nSCS,
.queue_size = 8,
.flags = 0
//.flags = SPICOMMON_BUSFLAG_MASTER | SPICOMMON_BUSFLAG_GPIO_PINS
};
if(ESP_OK == spi_bus_add_device(HOST, &dev_config, &spi)){
}
else{
}
}
spi_transaction_t spi_trans;
memset(&spi_trans, 0, sizeof(spi_trans));
spi_trans.cmd = 0;
spi_trans.addr = 0;
spi_trans.length = 8;
spi_trans.tx_data[0] = payload1;
spi_trans.tx_buffer = &testdata;
spi_trans.user = (void*)0;
//spi_trans.flags = SPI_TR;
if(ESP_OK == spi_device_acquire_bus(spi, portMAX_DELAY)){
}
else{
}
if(ESP_OK == spi_device_transmit(spi, &spi_trans)){
}
else{}
spi_device_release_bus(spi);