I have been fighting with the Arduino for the last  few years. this time I wanted to simplify my code base by using a struct in my header file:

// typdef struct frequency {

  int bits[20][5] = {{1,1,0,0,1},{1,1,0,0,0},{1,1,1,0,0},{1,0,0,0,1},{1,1,1,1,0},

                  {0,0,0,1,0},{0,1,1,1,1},{0,0,1,0,0},{1,0,1,1,1},{0,1,0,0,0},

                  {0,0,0,1,1},{1,0,0,0,0},{1,0,1,0,1},{0,0,0,0,1},{0,0,1,1,0},

                  {0,1,0,1,1},{0,0,1,0,1},{0,0,1,1,0},{1,0,0,1,0},{0,1,1,0,0}};

 

  char channels[20][3]= {{000},{108},{109},{110},{111},{112},{113},{114},{115},{116},{117},

                        {118},{119},{120},{121},{122},{123},{124},{125},{126}};

      

// } channels;

#include "C3436.h"

int Status;

int F[5]={};

 

 

void setup() {

  // put your setup code here, to run once:

  // Start serial port

  Serial.begin( 9600 );

 

  // Khz Pins

  for (int i = 1; i < 6; i++){

      pinMode (pins[i], INPUT_PULLUP);}

  // Mhz Pins

  for (int ii = 6; ii < 11; ii++){

      pinMode (pins[ii], INPUT_PULLUP);}

  // Other stuff

      pinMode ( powerpin, INPUT_PULLUP );

      pinMode ( lightPower, OUTPUT);

}

This has been a disaster, in a function I tried in vain to access the channels.bits[][] member but to no avail.  In my function I can access bits[][] but not as a member of the struct.

My code is posted below:  I have been having cold stupid sweats about stupid scoping rules which don't make any sense to me as a C programmer. Even the silliness of the loop() is a little nutty. Once in it how the hell do you get out of it. Also when you call an ISR it is a void so you have to use a side effect (a bad thing), ISRs normally return something. I am going to use  bare metal C programming. Here is a nice article on how to do it, he likes the silly platformIO, picture below, me I'm going to stick with my Swiss Knife, eclipse IDE, it is clean an uncluttered. I will be using GCC for the AVR.  

 

void loop()

void loop() {

 

 

int Stat = start();

    if( Stat == 1 ) run();

}

int start()

int start( ) {

   // check pwrpin

   int pwrpin= digitalRead(powerpin);

   pwrpin = 1; // force power on

   switch ( pwrpin ) {

      case 0: {

        pwrpin = 0;

        break;}

      case 1: {

        pwrpin = 1;

        break;}

      default: {

        pwrpin = -1;

        break;}

      }

  return pwrpin; }

void run ()

void run () {

 

  int x;

  int temp[10];

 

  // read the freq pins

  for ( x = 0; x < 10; x ++) {

    temp[x] = digitalRead( pins[x]); }

 

  // Now test the KHz pins; test columns using double loops

  for (int y = 0; y < 10; y++){

     for (int x = 0; x < 5; x++ ){

      if ( temp[x] == lowFrequency[x][y] ) {

        continue; }

      else { break; }

      }}

 

   // Now  test the Mhz pins

   for (int y = 0; y < 20; y++){

     for (int x = 0; x < 5; x++ ){

//   if ( temp[x] == channels.bits[x][y] ) {

      if ( temp[x] == bits[x][y] ) {

        continue; }

      else { break; }

      }}

 

 

}