I am using the spidev_test example in order to send data with the spidev interface. I activated the spisvc in order to have /dev/spidev1.0 interface. After that I compiled the spidev_test under /usr/bin. Once every thing in place, I ran the spidev_test program, I got clk MOSI and Chip_select signal. The problem is with the chipselect which reamain 0 all over the transmission and not toggling every byte. I have seen that cs_change =1 (which is the default value) can hadle this. However the chipselect is not toggling with every byte. Does any one have an idea how to solve this issue. The attached picture give more details. Thank you.