spi missing interrupts

[Jay S.]

I am using NRF51422 S130. I have a master SPI configuration set up, and not using Nordic spi drivers provided in the examples. I think my configuration is correct.

1- I send one byte of data at 2Mbips clock rate and can see on scope the 8 clock bits out. 2- I get an IRQ and clear the READY register and set a ready flag. 3- I send a second byte after ready flag and see 8 clock bits out again. 4- There is no IRQ after this point, which I don't understand. According to the Spec, for every byte transmitted should get one IRQ.

[Wojtek]

Something is wrong.

[Jørgen Holmefjord]

Can you post/upload your code and possibly a logic trace of the SPI bus?

[Jay S.]

I found the solution. Although the nrfF51 spec does not explicitly explains this but in order to get a new interrupt you need to read every input received by SPI in addition to clear READY register. I simply added {rdata = NRF_SPI1->RXD;} in the IRQ service call and I am getting every READY IRQ.