SPI slave not receiving messages

Question

Hello DevZone,

I am using the following example: github.com/.../ncs-spi-master-slave-example.git to test the functionality of the SPI slave device driver under zephyr. However, data does not seem to arrive at the SPI Slave RX, sent by the SPI TX. I have connected the pins as follows:

A5 <--> D0
A4 <--> D1
A3 <--> D2
A2 <--> D3

And I have compiled this repository for the nRD52840dk. When observing the NRF terninal, I get the following output, which makes it appear that the input for SPI_slave_RX is floating:

I have analyzed the logic state on the MOSI pin and I get the following, which makes it seem valid that data is on the pin:

I have also tried enabling pull up resistors by adding: bias-pull-up; to the &pinctrl, but this does not seem to fix it.

When compiling, I get a warning: Experimental symbol SPI_SLAVE is enabled.

Is there any knowledge on whether the SPI Slave drivers are working at all, if so, what can be done so that communication is possible from master TX to slave RX?

Jørgen Holmefjord · Accepted Answer

Turns out that the P1.01/P1.02 pins are assigned to the UARTE1 peripheral , and this peripheral is enabled by default in the board dts file . You can disable it by adding this section to the board overlay file: 
 &uart1 {
 status = "disabled";
};

SPI slave not receiving messages

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