gpioPin.cpp

#include "gpioPin.hpp"
#include <iostream>
#include <gpiod.h>

using namespace std;

// gpiod

struct gpiod_chip  *gpiochip;
struct gpiod_line  *gpioline[PIN_MAX];

bool  init_gpiod() {
  gpiochip = gpiod_chip_open_by_name ("gpiochip4");

  if (gpiochip == NULL)
    gpiochip = gpiod_chip_open_by_name ("gpiochip0");

  if (gpiochip == NULL) {
    printf ("unable to open GPIO\n");
    return false;
    }
  for (int loop=0; loop<PIN_MAX; loop++)
    gpioline[loop]=NULL;
  return true;
  }



bool  pinMode (int pin,int  mode) {
  bool flag=false;
  if (pin<0) return false;
  if (pin>=PIN_MAX) return false;

  if (gpiochip==NULL)
    init_gpiod();
  if (gpiochip==NULL)
    return false;

  // Pin initialise
  if (gpioline[pin]!=NULL)
    gpiod_line_release (gpioline[pin]);

  gpioline[pin] = gpiod_chip_get_line (gpiochip,pin);

  if (gpioline[pin] == NULL)
    return false;

  switch (mode) {

    case OUTPUT:
      flag=gpiod_line_request_output (gpioline[pin],"ardEmul",0) ==0;
      break;
    case INPUT:
      flag=gpiod_line_request_input (gpioline[pin],"ardEmul") ==0;
      break;

    case INPUT_PULLUP:
      flag=gpiod_line_request_input_flags (gpioline[pin],"ardEmul",
                                           GPIOD_LINE_REQUEST_FLAG_BIAS_PULL_UP) ==0;
      break;

    case INPUT_PULLDOWN:
      flag=gpiod_line_request_input_flags (gpioline[pin],"ardEmul",
                                           GPIOD_LINE_REQUEST_FLAG_BIAS_PULL_DOWN) ==0;
      break;

    case OPENDRAIN_PULLUP:
      flag=gpiod_line_request_output_flags (gpioline[pin],"ardEmul",
                                            GPIOD_LINE_REQUEST_FLAG_OPEN_DRAIN|GPIOD_LINE_REQUEST_FLAG_BIAS_PULL_UP,1) ==0;

    }
  return flag;

  // besoin de configurer la broche
  }

void release_gpiod (void) {
  if (gpiochip!=NULL) {
    for (int loop=0; loop<PIN_MAX; loop++)
      if (gpioline[loop]!=NULL) {
        gpiod_line_release (gpioline[loop]);
        gpioline[loop]=NULL;
        }
    gpiod_chip_close (gpiochip);
    gpiochip=NULL;
    }
  }



void digitalWrite (int pin,int  output) {
  if (pin >= PIN_MAX)
    return;
  if (gpioline[pin]==NULL)
    pinMode (pin,OUTPUT);
  gpiod_line_set_value (gpioline[pin],output);
  }


int digitalRead (int pin) {
  if (pin >= PIN_MAX)
    return -1;

  if (gpioline[pin]==NULL)
    pinMode (pin,INPUT_PULLUP);
  return gpiod_line_get_value (gpioline[pin]);
  }