CC2640R2F: NPI SPI not working in Pol=0, Ph=0 configuration while Pol=1,Ph=1 works fine

Chander G

Part Number: CC2640R2F

Hi,

I am working on Host-Test example of BLE5 app. I have made a UART-NPISPI bridge to talk with the HCI tester tool using MSP432 launchpad. Everything works fine with "spiParams.frameFormat = SPI_POL1_PHA1;" configuration but when I change it to " spiParams.frameFormat = SPI_POL0_PHA0; with corresponding change in master" , it doesn't respond.

On debug I found that if I apply breakpoint in "NPITLSPI_CallBack", I see that objTransaction->count =1 and the rxbuf has only first byte that is 0xfe written.

Pls help to resolve this issue.

Regards,

Chander

over 6 years ago

0 IUsedToBeARealPerson (M-W) over 6 years ago

TI__Guru 58425 points

Hi Chander,

As the host test example acts as a SPI Slave in this situations, you will need to connect a CS line in addition to the other SPI signals if you want to use SPI_POL0_PHA0. The SPI slave hardware in this mode expects the CS (or "FSS" in the Technical Reference Manual) to be toggled in between every byte.

To use a CS pin in the example, go into the project board file and assign a IO to the SPI0 CS define. You would of course make sure the MSP side (that is the SPI Master) also uses the CS.

0 Chander G over 6 years ago in reply to IUsedToBeARealPerson (M-W)

TI__Intellectual 2420 points

Thanks! M-W, The CS implementation resolves this issue.

Regards,

Chander

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CC2640R2F: NPI SPI not working in Pol=0, Ph=0 configuration while Pol=1,Ph=1 works fine