Unable to communicate with NRF24l01 using LPC1768.

RE: Unable to communicate with NRF24l01 using LPC1768.

awneil — Wed, 22 May 2019 09:24:29 GMT

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?

RE: Unable to communicate with NRF24l01 using LPC1768.

Mahesh Bhome — Wed, 22 May 2019 03:53:03 GMT

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?

RE: Unable to communicate with NRF24l01 using LPC1768.

awneil — Tue, 14 May 2019 10:21:54 GMT

Didn't we have all this yesterday?

A load of posts seem to have disappeared!

[quote userid="79661" url="~/f/nordic-q-a/47192/unable-to-communicate-with-nrf24l01-using-lpc1768/186907"]it seems correct[/quote]

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

[quote userid="79661" url="~/f/nordic-q-a/47192/unable-to-communicate-with-nrf24l01-using-lpc1768/186907"]how to check that NRF24l01 is sending dat or not[/quote]

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

RE: Unable to communicate with NRF24l01 using LPC1768.

Mahesh Bhome — Tue, 14 May 2019 10:02:11 GMT

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.

RE: Unable to communicate with NRF24l01 using LPC1768.

Mahesh Bhome — Tue, 14 May 2019 04:21:43 GMT

thanks for your reply.

RE: Unable to communicate with NRF24l01 using LPC1768.

awneil — Mon, 13 May 2019 08:17:32 GMT

[quote userid="79661" url="~/f/nordic-q-a/47192/unable-to-communicate-with-nrf24l01-using-lpc1768"]i am not getting any waveform on DSO[/quote]

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...