SPI EasyDMA MAXCNT limitation

[Cyril]

Hi everyone,

I've been testing SPIM with easyDMA, using nrf_drv_spi. I'd like to flush a 6-axis sensor FIFO in one SPI operation (31 samples * 12 bytes = 372 bytes) but as soon as the size of the buffer exceeds 256 bytes, it doesn't work and I only read 10 samples (120 bytes).

I can't find anywhere that MAXCNT is limited to 256 bytes. Is it a bug or is it really limited?

(I assume the sensor supports more than 256-byte read operation)

[Susheel Nuguru]

isn't MAXCOUNT 8 bit register? so max is 255 bytes. If you want to transfer more, you can use the LIST feature

[Coldson]

Hi @Aryan __on Vacation till week 30, can u kindly provide me more informant for SPI list feature. I try to send large data through SPI, but I found out that length type is uint8_t only can transfer 255 byte at a time, will SPI LIST feature fix my problem? Thx