librpip

librpipGpioGetValidPins

uint32_t librpipGpioGetValidPins(void);

Description

Gets the GPIO pins that are available for GPIO use after taking into account what the board physically has and removing any pins associated with active kernel modules or pins to ignore passed to librpipInit().

Parameters

None

Returns

A bit mask of valid pins.

Example

Print out all valid GPIO pin numbers:

uint32_t feature_set, pins, i;
feature_set = librpipInit(LIBRPIP_BOARD_DETECT, LIBRPIP_FLAG_DEBUG_ON, 0);
pins=librpipGpioGetValidPins();
for(i=0;i<32;i++) {
        if(pins & (1<<i)) fprintf(stdout,"Pin %u is available for GPIO functions\n",i);
}
librpipClose();