Do you have -t and -r options available for your spidev_test tool?
If so, please refer to the following commands to configure one SPI as master(-t) and another as slave(-r) to verify.
How to set to spi slave mode - #8 by KevinFFF
Do you have -t and -r options available for your spidev_test tool?
If so, please refer to the following commands to configure one SPI as master(-t) and another as slave(-r) to verify.
How to set to spi slave mode - #8 by KevinFFF