SPI DMA

[illglu]

Hello,
when enabling Async memcpy API:

Code: Select all

async_memcpy_config_t config = ASYNC_MEMCPY_DEFAULT_CONFIG();
async_memcpy_t driver = NULL;
ESP_ERROR_CHECK(esp_async_memcpy_install(&config, &driver));

then SPI with DMA stop working (send garbage).

[illglu]

for test purposes:
ESP32-C3
take "spi_slave/receiver" example, add "esp_async_memcpy_install" and spi doesn't work.

[ESP_Sprite]

Thanks for reporting this. Would you mind filing a github issue for this so we can properly triage and fix this?

[ESP_michael]

Hello,
when enabling Async memcpy API:

Code: Select all

async_memcpy_config_t config = ASYNC_MEMCPY_DEFAULT_CONFIG();
async_memcpy_t driver = NULL;
ESP_ERROR_CHECK(esp_async_memcpy_install(&config, &driver));

then SPI with DMA stop working (send garbage).

Hi illglu,

I think this is because of a hardware limitation: to enable memcpy of DMA, one of the peripheral ID need to be selected. But this will affect that peripheral. We have a fix for it (currently only on master fd2b9d9, will appear on v5.1, backports are being created.)