#include <stdio.h>
/*
    DDRx  - The Port x Data Direction Register - read/write
    PORTx - The Port x Data Register - read/write
    PINx  - The Port x Input Pins Register - read only 
*/

#define SERIALBUFSIZE         11
//char serialBuffer[SERIALBUFSIZE];
//byte setBufPointer = 0;

#define  CS     10
#define  OE     11
#define  DEVVCC 12
#define  REC_TYPE 0

unsigned long addrSize = 1024;


void setup() {                
  Serial.begin(115200);  
  delay(1000);
  PORTD = 0xFF;
  PORTC = 0xFF;
  PORTB = 0xFF; // needed for switch from tristate to output low
  PORTA = 0xFF;
  DDRD = DDRD | 0b11111100; // switch all but serial pins to output
  DDRC = 0x00;  // input
  DDRB = 0xFF;  // output
  DDRA = 0xFF;  // output
  Serial.println("GAL16V8 read v1.1");
  Serial.println("B0, B1,  B2, B3, B4, B5, B6, B7, A0, A1, C0,  C1,  C2,  C3,  C4, C5,     C6,   C7");
  Serial.println("1   2    3   4   5   6   7   8   9   11  12   13   14   15   16  17      18    19");
  Serial.println("IIN,IOUT,IA0,IA1,IA2,IA3,IA4,IA5,IA6,IA7,OACT,OC0R,OC1R,OC1W,OC2R,OC8FCS,ODBDR,O0");
  Serial.println();
  Serial.println("A1-A0,B7-B0  C0-C7");
  delay(100);
}

void loop() {

  int addrPoint;
  byte data;
  char fmtStr[20];
  
  for (addrPoint = 0; addrPoint < addrSize; addrPoint++) {
    printBinary(addrPoint, 10);
    setAddress(addrPoint);
    Serial.print("   ");
    printBinary(getData(), 7);
    Serial.println();
  }
  while(1) {} // halt
}

void setAddress(int address) {
  byte highAddr;
  byte lowAddr;
  highAddr = address >> 8;
  lowAddr  = address & 0xFF;
  PORTA = highAddr;
  PORTB = lowAddr;  
}

byte getData(void) {
  return PINC; 
}

void printBinary(int address, int base) {
  int bit;
  int bitCounter;
  address = address & 0xFFFF;
  for (bitCounter = base - 1; bitCounter >= 0; bitCounter--) {
    bit = (address & (1 << bitCounter)) ? 1 : 0;
    Serial.print(bit, DEC);
  }
}