Transfer more than 255 bytes with SPI slave on nrf52

[Ali89]

Hi all,

We were developing our application using nRF52840 and later decided to change to nRF52832 considering our hardware constraints. nRF52840 has 16 bit counter for EasyDMA and works fine for us. However, nRF52832 does not allow receiving more than 255 bytes being in SPI Slave and using EasyDMA. I have seen previous posts about how to use SPI Master and list to enable more than 255 bytes of SPI transfer in master mode. I am wondering if there is a similar way or other ways to receive more than 255 bytes in SPI slave mode and without missing any data. Our data stream is 32kB of data and clock frequency is 8MHz.

Thanks,

Ali

[awneil]

I think the question has been asked before - have you tried a forum search?

Ali89 said:

Our data stream is 32kB of data

Note that the nRF52832 has only 64K of RAM - so you're talking half of it in one go there!

[Ali89]

I just checked and you are right actually, this has been answered before and it is not possible to do more than 255 bytes in SPI slave. 

Thanks!

[awneil]

Oh well!

Please verify the answer: