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SPI Half-Duplex Example

This is an example of using SPI on ESP32 in half-duplex mode to transfer data between an ESP32-S3 (master) and ESP32-C6 (slave). It is based on the ESP-IDF SPI Half-Duplex Example.

This is intended to be a reference for implementing transfers using QSPI.

GPIO Configuration

For SPI

For SPI, the following values should be set in spi_bus_config_t:

  • sclk_io_num (SCLK)
  • mosi_io_num (MOSI)
  • miso_io_num (MISO)

For QSPI

For QSPI, the following values should be set in spi_bus_config_t:

  • sclk_io_num (SCLK)
  • data0_io_num (DAT0)
  • data1_io_num (DAT1)
  • data2_io_num (DAT2)
  • data3_io_num (DAT3)

GPIO Mappings between SPI and QSPI

Based on the structure of spi_bus_config_t found in spi_common.h:

  • mosi_io_num is data0_io_num
  • miso_io_num is data1_io_num
  • quadwp_io_num is data2_io_num
  • quadhd_io_num is data3_io_num

QSPI GPIOs for MCUs

Signal ESP32-S3 (SPI2) ESP32-C6 (SPI2)
CS 10 10
CLK 12 6
DAT0 11 7
DAT1 13 2
DAT2 14 5
DAT3 9 4

References