SPI communication between nRF9160DK and nRF52840DK

[Jagruti]

Hello,

I want to transfer data from nRF52840DK to nRF9160DK using SPI. I want to use nRF52840DK as master which will transfer the data and nRF9160DK as slave which will receive the data.

I have never worked with nRF52840DK. For SPI master, I tried SPI example on nRF52840DK. When I connect MOSI to MISO, the data is transferred. Now I want to transfer this data to nRF9160DK.

On nRF9160DK, I tried SPI master example to check if it works. Now I want to use nRF91 as SPI slave. So I added spi slave drivers and changed overlay file also. But I am not understanding how to configure spi_config struct for slave.

static const struct spi_config spi_cfg = {
//	.operation = SPI_OP_MODE_SLAVE | SPI_MODE_CPOL | SPI_MODE_CPHA,
        .operation = SPI_OP_MODE_SLAVE,
	.frequency = 4000000,
	//.slave = 1,

};

I am not understanding how to set these parameters to configure spi in slave and receive the data.

I connected both the dks to check if nrf91 can receive the data, but spi_read shows error

[Karl Ylvisaker]

Hello,

Have you attempted to flash one of the devices with the SPI Slave example, and the other with the SPI Master example - and testing them according to their documentation?
If you have not, please do it and let me know if you experience any unexpected results.

Are you working out of an example provided in the SDK? If so, which one?
Could you also tell me where the code snippet you provided is from, I am unable to recognize it.

I am not understanding how to set these parameters to configure spi in slave and receive the data.

Have you seen the SPIS API Reference or Data Structure description in the SDK documentation?
They detail the different options for each data structure and driver functions.
You might also be interested in seeing this description of SPI Slave driver usage.

Was this what you were looking for?

but spi_read shows error

Please detail what error it shows, and when it is encountered.

Best regards,
Karl

 

[Jagruti]

Actually I want to configure nRF9160DK as spi slave. So can you please provide the document for that. For nRF91 I am using zephyr spis driver.

[Karl Ylvisaker]

My mistake.
Here is the SPI API Reference for the Zephyr SPI driver.
Is this what you were looking for?

Best regards,
Karl

[Jagruti]

Thank you for the documentation.

Yes I was looking for Zephyr SPI driver as well as nrf drivers for nRF52 also. I tried the spi programs on both the DKs. Separately they are working properly. But when I try to read from nrf52 on nrf91, it shows error. So now I am switching to I2C. I2C communication is good between both the DKs. I can receive data from nrf52.

But still curious why spi did not work together.

[Karl Ylvisaker]

Jagruti said:

Thank you for the documentation.

No problem at all, I am happy to help!

Jagruti said:

Separately they are working properly.

What do you mean when you say this; do you mean that the performance was as expected when you flashed one device with the SPI Slave example, and another one with the SPI Master example?

Jagruti said:

I2C communication is good between both the DKs.

I am glad to hear that you have achieve the communication you were after.
If required, I would not think setting up SPI should prove to be a large endeavor.

Best regards,
Karl