Hi,ShaneCCC Thanks for your reply,
I try ollow your reply change device tree on BSP 4.6 NANO module + customer board. and set spi1_miso (GPIO PB05 pin number 108). The gpio needs to be able to pull the voltage up and down.
After recompiling and flash GPIO PB.05 and use echo 13 > /sys/class/gpio/export echo 1 /sys/class/gpio/gpio13/value
control voltage high and low. but still low voltage.
it might be related to pd strength not enough to change the pin state?
How can i Adjustment device tree? Thanks for the help