#include Once "gpiopins.bi"

GpioPinOpen(pin) opens the NuttX device named /dev/gpioN. GpioPinOpenDevice(device) opens an explicit device path. Both return a non-negative handle or -1 on failure.

GpioPinRead(handle) returns GPIOPIN_LOW, GPIOPIN_HIGH, or -1. GpioPinWrite(handle, value) and GpioPinClose(handle) return zero on success and -1 on failure. GpioPinGetType and GpioPinSetType query or request one of the GPIOPIN_* input, output, open-drain, or interrupt modes declared by the header.

The current hardware implementation is the NuttX GPIO character-device backend. Other targets export predictable unsupported-operation stubs so a portable source can link. Hosted targets report ENOSYS through errno; Windows CE reports ERROR_CALL_NOT_IMPLEMENTED through GetLastError. Device numbering, pin mux, electrical limits, and interrupt registration remain board responsibilities.

#include Once "gpiopins.bi"

Dim As Integer pin = GpioPinOpen( 0 )
If pin < 0 Then
    Print "GPIO 0 is unavailable"
    End 1
End If

If GpioPinSetType( pin, GPIOPIN_OUTPUT ) = 0 Then
    GpioPinWrite( pin, GPIOPIN_HIGH )
End If

GpioPinClose( pin )

• Since fbc 1.20.2
  
  

• NuttX and RISC-V board workflow
  
• __FB_NUTTX__