RE: CSN event trigger on nRF51822

Stian Røed Hafskjold — Thu, 30 Oct 2014 16:36:05 GMT

I'm glad it works! If you feel your question has been answered, please accept the answer so we can close the thread

RE: CSN event trigger on nRF51822

Bogdan — Wed, 29 Oct 2014 14:03:59 GMT

Thanks for the reply. Indeed, I've connected CSN with another GPIO and it works.

RE: CSN event trigger on nRF51822

Stian Røed Hafskjold — Wed, 29 Oct 2014 13:39:56 GMT

Is there a way to setup CSN line to also trigger an event by using GPIOTE? According to the documentation, when the pin is controlled by GPIOTE, other operations on that pin will have no effect.

Could you just assign CSN to one pin and GPIOTE event to another pin and connect those pins together physically? So that 'chip select' from master both trigger the CSN and GPIOTE event?

If the pin cannot be used like that, is there a way for the SPIS to not use CSN line? Act like it's the only slave on the SPI and get data on each CLK edge (ignoring the CSN line)?

SPIS needs the CSN line to acquire and release the semaphore that enables sharing of the RXD and TXD buffers between the SPIS and the CPU.