I have been experiencing a problem with an SPI bus and I can't figure it out. I am using a custom developed board with the ESP32-S3-WROOM-1 module on it.
I have connected to the board an external ADC MCP3204 from Microchip which communicates over SPI with the ESP, pinout:
GPIO39 SCK FSPI_SCK
GPIO40 MISO FSPI_MISO
GPIO41 MOSI FSPI_MOSI
GPIO42 CS Analog to digital converter
I originally wrote my whole code for it using the Arduino Framework & PlatformIO which worked fine with the Arduino libraries but I have decided to switch over to the ESP-IDF.
I did find a pre-made library for the MCP3204 at: https://github.com/gfurtadoalmeida/esp32-driver-mcp320x
Code: Select all
#include "driver/spi_master.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "esp32_driver_mcp320x/mcp320x.h"
void app_main(void)
{
spi_bus_config_t bus_cfg = {
.mosi_io_num = GPIO_NUM_23,
.miso_io_num = GPIO_NUM_19,
.sclk_io_num = GPIO_NUM_18,
.quadwp_io_num = -1,
.quadhd_io_num = -1,
.data4_io_num = -1,
.data5_io_num = -1,
.data6_io_num = -1,
.data7_io_num = -1,
.max_transfer_sz = 3, // 24 bits.
.flags = SPICOMMON_BUSFLAG_MASTER,
.isr_cpu_id = INTR_CPU_ID_AUTO,
.intr_flags = ESP_INTR_FLAG_LEVEL3};
mcp320x_config_t mcp320x_cfg = {
.host = SPI3_HOST,
.device_model = MCP3204_MODEL,
.clock_speed_hz = 1 * 1000 * 1000, // 1 Mhz.
.reference_voltage = 5000, // 5V
.cs_io_num = GPIO_NUM_5};
// Bus initialization is up to the developer.
spi_bus_initialize(mcp320x_cfg.host, &bus_cfg, 0);
// Add the device to the SPI bus.
mcp320x_t *mcp320x_handle = mcp320x_install(&mcp320x_cfg);
// Occupy the SPI bus for multiple transactions.
mcp320x_acquire(mcp320x_handle, portMAX_DELAY);
uint16_t voltage = 0;
for (size_t i = 0; i < 10; i++)
{
// Read voltage, sampling 1000 times.
mcp320x_read_voltage(mcp320x_handle,
MCP320X_CHANNEL_0,
MCP320X_READ_MODE_SINGLE,
1000,
&voltage);
ESP_LOGI("mcp320x", "Voltage: %d mV", voltage);
}
// Unoccupy the SPI bus.
mcp320x_release(mcp320x_handle);
// Free resources.
mcp320x_delete(mcp320x_handle);
}
Is there any way to properly configure the custom SPI pins to work? Running VS Code IDF Version 5.1.
Regards,
Radu