SPI DMA in ESP32-S2-WROOM

[srikanth r]

hi

now we are implemented SPI poling in ESP32-S2-WROOM module. But now I need to implement SPI DMA for Transmit and receive .
is ESP32-S2-WROOM module supports SPI DMA ?
actually we searched in github, I find SPI DMA stack but in that no DMA related functions.

thank you
srikanth

[ESP_Sprite]

Given that you're using the ESP-IDF SPI driver and assign a DMA channel to the host driver when initializing it, you're already using DMA. The driver will use DMA for data transfers automatically.

[srikanth r]

thanks for reply.
Actually we are using the code which is present in the link.
link: https://github.com/hideakitai/ESP32DMASPI
In example i am not seen any interrupt routine for checking Transmit complete and Receive Complete. please let me know if any other examples are there for SPI DMA implementation.


thanks in advance
srikanth

[PeterR]

Keep in mind that DMA can be counter productive for small transfers. One of my SPI channels is a cheap MPC2515 and that is a very chatty device with between 3 and 8 byte transfers. Latency & setup really kill that through put. On the short transfers I measured that no DMA was faster. Basically the SPI FIFO can handle it, you only get the ISR on CS, you don't get hit by SPI full. DMA adds a setup time to the transaction & if not needed then why spend time configuring those register? Clearly longer transfers (which bust the SPI FIFO) would benefit.

[denial]

i'm new to the community and esp32 can i get a simple spi loopback example code for esp32