I’m trying to write on a GPIO pin on the specified eval board. According to the board’s datasheet, GPIO_1 is connected to MXM3_1 (mapped to X3: B10).
When I try to export the GPIO number in the user space:
echo 1 > /sys/class/gpio/export
I get the message: echo: write error : operation not permitted.
Is the number wrong? or is the GPIO_1 already being used (what are the accessible GPIOs)?
I tried other numbers like 257 (X9: A21 MXM3_257), and I could export it and set the direction but when i’m trying to write a value, i get the same error.