Hi All,
I am struggling with this question from many days. Does the SPI transmit or receive operation in SPI master code uses DMA? While using SAADC DMA I have specified buffer size as N(some uint8_t value) and directly started the sampling SAADC through PPI. So as soon as buffer is fulled NRF_DRV_SAADC_EVT_DONE
generated and we can read the data using nrf_drv_saadc_buffer_convert
instruction. Upto this point it is clear that I can read the data from RAM when DMA buffer is full.
Now in similar way I want to transfer 20 bytes to external accelerator (which uses SPI) using DMA over SPIM. How can I achieve this specifying buffer size and buffer data.
As per DMA concept I can do my usual work in main function till all bytes getting transferred. How can I write data packets to RAM without CPU involvement and then to accelerator in nrf52?