I can't get signal from SPI ports.

I am trying to write a spi slave device driver for adxl345 accelerometer. Everything worked without error in dmesg but i cant get any data from SPI device. I can get data when i tried on raspberry pi.

I tried to catch the signal saleae logic analyzer but everything was so quiet, no signal.

  1. So i changed device tree by adding:

spi@480b8000 {
compatible = “ti,omap2-mcspi”;

phandle = <0x175>;
spidev@0 {
compatible = “spidev”;
reg = <0x0>;
#address-cells = <0x1>;
#size-cells = <0x0>;
spi-max-frequency = <0x7a120>;
phandle = <0x998>;

spidev0 = “/ocp/spi@480b8000/spidev@0”;

the node apperared as /dev/spidev3.0

2)Then i made shortcut SOMI and SIMO pins referenced to here:

And i tested device by using spidev_test.c downloaded from here :


But it returns only zeroes.

What am i missing or doing wrong?