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Post: You could try running a loopback test by connecting the MOSI and MISO pins together and sending data between them. I have uploaded a test program to our GitHub repository that should work for performing a loopback test. [url=https://github.com/abelectronicsuk/testscripts/blob/master/spiloopback.c]spiloopback.c[/url] Save the code as spiloopback.c and compile it using: [code]gcc -o spiloopback spiloopback.c[/code] Remove the ADC DAC Pi and link the MOSI and MISO pins together with a jumper wire. MOSI and MISO are pins 19 and 21 on the GPIO header. Run the program: [code]sudo ./spiloopback[/code] If the SPI bus is working it should return: [code]SPI loopback test passed![/code] If it fails it will return: [code] SPI loopback test failed! Sent: 0xAA 0x55 0xFF 0x00 Received: 0x00 0x00 0x00 0x00 [/code] If the test fails try setting up a clean installation of Raspberry Pi OS on a spare SD card, enable the SPI bus and run the test again on the new installation. That will allow you to narrow the issue down to being a software issue with Linux or a hardware issue with the Raspberry Pi.