nRF24L01+ only answer on first SPI Command

RE: nRF24L01+ only answer on first SPI Command

ovrebekk — Tue, 08 May 2018 11:19:31 GMT

I am glad to hear it 🙂

Good luck with your project!

RE: nRF24L01+ only answer on first SPI Command

blevita — Mon, 07 May 2018 11:38:03 GMT

Hi Torbjørn

Thank you very much for your answer.

I have just changed the clock polarity according to your proposal.
And it just works :)

Problem is solved!

RE: nRF24L01+ only answer on first SPI Command

ovrebekk — Mon, 07 May 2018 11:35:42 GMT

I think the problem here is that the clock line is not cleared at the end of the first transaction.

When the clock line is high at the moment CE is pulled low (on the second transaction) the nRF24L01+ immediately interprets this as a low to high transaction, and samples the first bit one bit too early. The fact that the response on the first byte is shifted one bit to the left corroborates this theory.

Make sure to clear the clock output at the end of the transition, and see if it works better.

Best regards
Torbjørn