SPI end event is not generating

[Lakshmi_K]

Dear Sir,

To Nordic Dev kit, a sensor is interfaced via SPI lines. Using SPI in blocking mode (Polling).

After initializing SPI communication, 2 bytes are written to the sensor. SPI transfer is initiated but does not end, SPI is waiting to get SPI-END event. 

Also observed that end tx event is generated. 

Thank You,

Regards,

Lakshmi 

[Kenneth]

Do you have a logic analyzer trace of CS, CLK, MISO and MOSI?

Kenneth

[Lakshmi_K]

Dear Kenneth,

No. But what is the cause for this issue?

[Kenneth]

If the sensor for instance is forcing the pins low (e.g. CLK line low), this can prevent the data to be transmitted. Does the same occur if you remove the sensor from the 4 SPI pins in question?

Best regards,
Kenneth

[Lakshmi_K]

If I remove sensor, code does not wait for the SPI end event.

[Kenneth]

I suggest to first verify that the \nRF5_SDK\examples\peripheral\spi works as-is. Then next step is to get an logic analyzer so you can look at the digital lines.

Best regards,
Kenneth