gpio_request

The interface has the following parameters.
  • Synopsis: 
    int gpio_request(unsigned gpio, const char * label)
  • Description: The function is used to request access to a GPIO interface.
  • Parameter:
    • gpio: The GPIO index number.
    • label: The GPIO name. Leave it as NULL if you have no idea.
  • Return:
    • Success: 0.
    • Failure: Error code.