nrf52 spi always faults out

RE: nrf52 spi always faults out

RK — Fri, 22 Jan 2016 07:27:33 GMT

well I'm not going to read a 50 page datasheet - try other commands, simpler ones perhaps, something which returns status, make sure the thing is properly reset, make sure you have it configured properly so that it's supposed to be doing something. The MOSI trace is fine so what you're seeing is the reply from the chip which is .. there isn't one. And check the chip wiring too to ensure you have all the pins hooked up properly.

RE: nrf52 spi always faults out

oliverhu — Fri, 22 Jan 2016 04:31:08 GMT

actually, I tried to send write register command and then read this register, but result is still like that. no matter what register i read the result is not changed. so i think i didn't receive any thing from slave. this is the datasheet of the slave www.ti.com/.../ads1292.pdf

RE: nrf52 spi always faults out

RK — Fri, 22 Jan 2016 04:24:05 GMT

well what's wrong? Is that the only thing you're sending to it, just a read register? How do you know the answer isn't zero which is what you're getting? Have you sent enough configuration commands to start it converting?

The trace looks fine, you're just getting zero back. Try some different commands which you know will return something other than zero.

RE: nrf52 spi always faults out

oliverhu — Fri, 22 Jan 2016 03:19:53 GMT

anyone can help ?

RE: nrf52 spi always faults out

oliverhu — Thu, 21 Jan 2016 09:35:59 GMT

thank you, have edited the question

RE: nrf52 spi always faults out

RK — Thu, 21 Jan 2016 09:17:25 GMT

green color is miso, blue one is miso,

they can't both be miso - which one is which