SPIS set buffer

[MarcoR]

Hi,

I have a doubt regarding buffer setting in SPIS.

In the SDK15 SPIS example, buffers are set using nrfx_spis_buffers_set(...) and it works perfectly.

I was wondering if it's possible to avoid the buffer_set cal, setting a fixed RAM region using, for example:

   NRF_SPIS1->TXD.PTR = &my_data

   NRF_SPIS1->TXD.MAXCNT = my_data_size

(my_data is updated periodically every 500us)

Does nrfx_spis_buffers_set have to be called for every SPI transaction or is there any alternative method?

 

Marco

[haakonsh]

If you want to re-use your tx/rx buffers then you only need to call nrfx_spis_buffers_set once during initialization. The SPIS will use whatever's in the RXD/TXD registers and it does not reset the register after a transaction is completed. 

[MarcoR]

I am connecting 2 nrf52832 boards. The SPI master works with the "spi" SDK example.