nRF24L01 returns 0x0E instead of register value

[EFis]

Hello, recently I tried to establish simple SPI communication between my S6E2CC board and nRF24L01 chip. What I do is I try to read 0x05 register and the answer should be 0x02, but all I get is 0x0E. I read in the forum, that it might be because CE line is not connected correctly which was not the case for me. At first we tried to test it with STM32L053C8 and tied CE to +3.3V output and CSN to GND-code worked. Now we try to do the same idea with S6E2CC and it does not. I measured that SPI initialises so it must be something in between. I tried to implement CE and CSN control with pins (project attached) according to the datasheet, but it gave no results. Just to make sure I tried other registers to the same result. Maybe I do not see something? I used Keil 5.24.2.0.

Projcet.7z

[Håkon Alseth]

Hi,

 

The nRF24L01+ will always return the STATUS register (this is the 0x0E value you get) on a write command. Have you tried adding a dummy read afterwards to read out the actual content, as per chapter 8.3.2 in the nRF24L01+ datasheet?

Kind regards,

Håkon

[EFis]

No I did not-all I did was to sent read command and see what I get back. Would 0x0E be returned if there is no MOSI signal, just clock?

[Håkon Alseth]

For every write command, the nRF24L01+ will shift out the current content of the STATUS register on the MISO pin. The command you shifted out on MOSI will be responded to in one byte delay.

This is better shown in the datasheet, chapter 8.3.2.

Kind regards,

Håkon