spi master reconfigure

RE: spi master reconfigure

wim — Tue, 12 Apr 2016 14:37:31 GMT

ok, will try

RE: spi master reconfigure

Kenneth — Tue, 12 Apr 2016 12:28:20 GMT

Basically if you use \nRF5_SDK_11.0.0_89a8197\examples\peripheral\spi\ as a starting point, then the clean way to change the configuration is by calling nrf_drv_spi_uninit() followed with nrf_drv_spi_init(). However if you just want to change the CPHA/CPOL configuration you could simply write new configuration directly by writing to NRF_SPI0->CONFIG between nrf_drv_spi_transfer().

RE: spi master reconfigure

wim — Tue, 12 Apr 2016 11:16:33 GMT

Kenneth, it is still not clear to me.

What do you mean with 'the driver'? Is that software or hardware? In my question I meant should I enable/disable using SPI0.ENABLE register.
What do you mean with "The alternative is to disable and re-enable with new setting between transactions that require change in configuration"? is that hardware or software?

The simplest for me would be to do just that register write on the fly and that's it. But just wanted to know if there are side effects I need to take into account

RE: spi master reconfigure

Kenneth — Tue, 12 Apr 2016 09:57:01 GMT

Most likely the hack suggested by wizath will work, in that case you directly access the peripheral and can change the SPI configuration on the fly between SPI transactions. There is no need to disable or re-enable the driver in such case. The alternative is to disable and re-enable with new setting between transactions that require change in configuration.

RE: spi master reconfigure

wim — Mon, 11 Apr 2016 11:29:28 GMT

so if enabled, i need to disable first and then re-enable?

RE: spi master reconfigure

wizath — Mon, 11 Apr 2016 11:28:19 GMT

Direct register write for spi peripherial while disabled works for me.

Just use:

NRF_SPI0->PSELMISO = 0;

or whatever option you like.