Can't set nRF24l01 + in Tx

RE: Can't set nRF24l01 + in Tx

ovrebekk — Fri, 13 Nov 2015 15:16:48 GMT

Did you try to read out one of the registers before writing it first?

Alternatively, could you probe one of the SPI transactions with a scope and send me the plot, so I can verify that the SPI communication looks OK?

RE: Can't set nRF24l01 + in Tx

anhtu — Tue, 10 Nov 2015 15:05:53 GMT

Here my code TX.c, RX.c after you gave me some advises, but i still can't communicate between transmitter and receiver

COM4 is a transmitter
COM6 is a receiver

RE: Can't set nRF24l01 + in Tx

ovrebekk — Mon, 09 Nov 2015 14:40:57 GMT

I have a couple of suggestions and follow up questions:

Could you save and attach the serial output you get after running the application?

Have you tried to read one of the standard registers (like CONFIG) before writing it to make sure that you get the expected default value? This will ensure that the SPI is configured correctly.

Could you try to add a 2ms delay after setting the power up bit in the CONFIG register? This to give the 16MHz XO time to start.

Last but not least, you should add a delay after pulsing CE before you check the FIFO_STATUS register again. Sending a single packet typically takes around 2-300us, and you won't have time to send it in 25us alone.

Best regards
Torbjørn