There are a bunch of members in spi_device_interface_config_t structure which you aren't initializing, they include pre_cb and post_cb callback pointers. Because these pointers are not initialized, they contain garbage values previously present on the stack. SPI driver calls these function pointers...

ESP_igrr wrote:Which pins are you using as SPI_MISO, SPI_MOSI, SPI_CLK?

I use the following pins:
These pins worked fine for me before when setting up SPI.

Hi all, Recently started using the ESP32 DevKitC and could successfully communicate in SPI. However, recently I've encountered a few problems with transmitting a simple value via SPI. At the moment my implementation consists of a header (hal.h) and source (hal.c) file. The hal.c file has an initiali...