Hi, When configuring spi_bus_config_t, by default max_transfer_sz, is 4094 Bytes. i.g. spi_bus_config_t buscfg={ .miso_io_num=PIN_NUM_MISO, .mosi_io_num=PIN_NUM_MOSI, .sclk_io_num=PIN_NUM_CLK, .quadwp_io_num=-1, .quadhd_io_num=-1, .max_transfer_sz=0 //in bytes, default is 4094 }; If you go to spi_co...

Hi @squonk11, First time I hear this "peculiarity", do you have a source where to find more about it? I have seen some posts regarding 4 bytes lost, when using SPI slave mode. I am not currently using the slave mode to verify but that is different from your use case. You can use polling as trans_res...

Hi, I have struggled with this matter before. There are a few options to address, and it depends very much on: What is your data size (Tx) in bytes? (i.g. 3 bytes 0x06 0x00 0x00) Are they repetitive (same data sent over and over)? (i.g. last 3 bytes to transmit for lets say 3600 times) Are you expec...