Unable to communicate with NRF24l01 using LPC1768.

[Mahesh Bhome]

Dear Sir/Madam,

                          I have interfaced NRF24l01 module with LPC1768. Then used example code from Github for Intial configuration of NRF24l01 using LPC1768.  checked waveform on SCK,CSN and MOSI pins that atleast communication between NRF and LPC is get establish or not. but i  am not getting any waveform on DSO kindly help me out.

Regards,

Mahesh Bhome.

[awneil]

Mahesh Bhome said:

i  am not getting any waveform on DSO

The LPC would be the Master, so the problem must lie there. You need to go to NXP for support with that - it has nothing to do with Nordic!

Your first step would be to  get appropriate signals out of the LPC without the nRF device connected...

[Mahesh Bhome]

thanks for your reply. 

[Mahesh Bhome]

Hi,  i have tested my SPI code. check wave forms  On MDO for SCK,MOSI and CSN pin. it seems correct for SPI_Write() function, then i have tested code for sending data to nrf using spi i am gettings waveforms for SCK,MOSI and CSN but how to check that NRF24l01 is sending dat or not.

[awneil]

Didn't we have all this yesterday?

A load of posts seem to have disappeared!

Mahesh Bhome said:

it seems correct

You need to be more certain than that!

Compare what you see on your 'scope with what the nRF24l01 datasheet tells you it requires.

Product Specification:

https://infocenter.nordicsemi.com/pdf/nRF24L01P_PS_v1.0.pdf?cp=8_4_0_0

specifically, section 8.3.2 SPI timing on p52

Mahesh Bhome said:

how to check that NRF24l01 is sending dat or not

This is basic SPI:

MOSI = Master Out, Slave In - so that's what's going from the LPC to the nRF;

MISO = Master In, Slave Out - so that's what comes from the nRF to the LPC.

https://en.wikipedia.org/wiki/Serial_Peripheral_Interface

P

[Mahesh Bhome]

HI, 

    Please find waveform of  SCK (Yellow color),CSN(Blue color),MOSI(Pink color). i have attached here with.this wavefroms are on Pins from LPC1768 to NRF24l01, i diindnt get any waveform on MISO pin. tell this waveforms are ok or any problem with this.and one more question can i share my code with you?

[awneil]

These buttons, and the USB socket, allow you to capture a screenshot from your scope - much better than a dodgy photo!

and, surely, that scope can decode the SPI for you?