SPI and TWI run out of resources

RE: SPI and TWI run out of resources

haakonsh — Mon, 22 Jun 2020 13:10:05 GMT

There's nothing that prevents you from switching between SPI and TWI though. See the Peripheral Resource Sharing (PRS) library for instance.

RE: SPI and TWI run out of resources

Nick_RA — Mon, 22 Jun 2020 10:39:09 GMT

I'm guessing that would be possible with separate CS lines as one of the SPI devices isn't written to that often ... I'll have a think on that one thanks. Right now as I'll need to respin my board anyway I'm thinking along the lines of using a simple shift register for the IO (well the "O" anyway) as it's only for LEDs and relays - simple & cheap.

RE: SPI and TWI run out of resources

haakonsh — Mon, 22 Jun 2020 08:15:33 GMT

Can you use a one SPI instance for a multiple of the SPI devices? It is a bus after all.

RE: SPI and TWI run out of resources

Turbo J — Sun, 21 Jun 2020 12:16:08 GMT

Both SPI and I²C master can be done in software only.

[quote userid="78418" url="~/f/nordic-q-a/62849/spi-and-twi-run-out-of-resources"]Is it possible to dynamically reconfigure an instance between SPI & TWI? [/quote]

Not with the nrf_drv or nrfx driver software out-of-the-box. You'd have to modify the interrupt handler - it would need to detect which mode the peripherial is in and then call SPI or TWI handler.