How can I adjust cursor position without changing screens? - c++

Question

I have a project I'm working on with an LCD screen, two buttons, and a potentiometer, it's a binary calculator. When I reach screenState == 3 I am attempting to change the digits so i can keep track of them and add an 8 bit number with another 8 bit number, while tracking overflow. However, whenever I begin to use the button which the input == 0 it moves the cursor, and then my next button cycles through the screens again. Input == 0 should only change the value between 0 and 1 for whatever lcd.cursor value I'm. How can i adjust that one value without changing screens?
#include <LiquidCrystal.h>
LiquidCrystal lcd(11, 10, 5, 4, 3, 2);
const int numInputs = 2;
const int inputPins[numInputs] = {13, 12};
// tracks screen state
int screenState = 0;
int prevScreenState = 0;
int binaryValue = 0;
// tracks if we are on the right screen to acceptInput and if our value is 0 or 1
bool canAcceptInput = false;
bool valIsZero = false;
int inputState[numInputs];
int lastInputState[numInputs] = {LOW,LOW};
bool inputFlags[numInputs] = {LOW,LOW};
int inputCounter[numInputs];
int cursorPosX = 0;
int cursorPosY = 0;
int blinkingPosX = cursorPosX;
int blinkingPosY = cursorPosY;
unsigned long lastDebounceTime[numInputs] = {0,0};
long debounceDelay = 50;
void setup() {
for(int i = 0; i < numInputs; i++) {
pinMode(inputPins[i], INPUT);
digitalWrite(inputPins[i], HIGH); // pull-up 20k
}
Serial.begin(9600);
lcd.begin(16, 2);
}
void loop() {
setInputFlags();
resolveInputFlags();
}
void setInputFlags() {
for(int i = 0; i < numInputs; i++) {
int reading = digitalRead(inputPins[i]);
if (reading != lastInputState[i]) {
lastDebounceTime[i] = millis();
}
if ((millis() - lastDebounceTime[i]) > debounceDelay) {
if (reading != inputState[i]) {
inputState[i] = reading;
if (inputState[i] == HIGH) {
inputFlags[i] = HIGH;
}
}
}
lastInputState[i] = reading;
}
}
void resolveInputFlags() {
for(int i = 0; i < numInputs; i++) {
if(inputFlags[i] == HIGH) {
// Input Toggle Logic // all invoked upon bttn press
inputCounter[i]++;
updateScreenState(i);
printString(i);
inputFlags[i] = LOW;
}
}
}
void updateScreenState(int input) {
// input 0 = State 0 and 1
if(input == 0) {
if(screenState > 2 & screenState < 19) {
canAcceptInput = true;
binaryValue = 1;
updateScreenValues();
}
else if (screenState == 1) {
//screenState = 0;
binaryValue = 0;
updateScreenValues();
}
else {
//screenState = 2;
binaryValue = 1;
}
// input 1 = State 2 to 6
}else if(input == 1) {
// we have 20 max screen states, this cycles through them using button 2
if(screenState == 0 || screenState == 1 || screenState > 19) {
screenState = 2;
updateScreen();
}else{
screenState++;
updateScreen();
}
}
}
void setCursorValues( int cursorX, int cursorY) {
lcd.setCursor(cursorX, cursorY);
cursorPosX = cursorX;
cursorPosY = cursorY;
}
void updateScreenValues() {
if(canAcceptInput == true) {
if(binaryValue == 0 ){
lcd.print("0");
}
if(binaryValue == 1) {
lcd.print("1");
binaryValue = 0;
}
}
}
// void update -----------------------------------------------------------------------------
void updateScreen() {
// welcome screen -----------------------------
if(screenState == 2){
canAcceptInput = false;
lcd.clear();
setCursorValues(0, 0);
lcd.print("Welcome Screen");
setCursorValues(0, 1);
lcd.print("Press Bttn 1");
}
// start of byte 1 screen ----------------------------------------------------------------
if(screenState == 3){
canAcceptInput = true;
lcd.clear();
setCursorValues(0, 0);
lcd.print("Byte 1 Screen");
setCursorValues(0, 1);
lcd.print(" 0000 0000 ");
//move cursor to MSD and blink
setCursorValues(3, 1);
lcd.blink();
}
//if screenState changes, so will the cursorValues-----------
if(screenState == 4) {
setCursorValues(4, 1);
}
if(screenState == 5) {
setCursorValues(5, 1);
}
if(screenState == 6) {
setCursorValues(6, 1);
}
if(screenState == 7) {
setCursorValues(9, 1);
}
if(screenState == 8) {
setCursorValues(10, 1);
}
if(screenState == 9) {
setCursorValues(11, 1);
}
if(screenState == 10) {
setCursorValues(12, 1);
}
//start of byte 2 screen -------------------------------------------------------
if(screenState == 11){
lcd.clear();
setCursorValues(0, 0);
lcd.print("Byte 2 Screen");
setCursorValues(0, 1);
lcd.print(" 0000 0000 ");
setCursorValues(3, 1);
lcd.blink();
}
//if screenState changes, so will the cursorValues-----------
if(screenState == 12) {
setCursorValues(4, 1);
}
if(screenState == 13) {
setCursorValues(5, 1);
}
if(screenState == 14) {
setCursorValues(6, 1);
}
if(screenState == 15) {
setCursorValues(9, 1);
}
if(screenState == 16) {
setCursorValues(10, 1);
}
if(screenState == 17) {
setCursorValues(11, 1);
}
if(screenState == 18) {
setCursorValues(12, 1);
}
if(screenState == 19){
lcd.clear();
setCursorValues(0, 0);
lcd.print("Solution Screen");
lcd.noCursor();
}
if(screenState == 20){
lcd.clear();
setCursorValues(0, 0);
lcd.print("Contrast Screen");
}
}
void printString(int output) {
Serial.print("Input ");
Serial.print(output);
Serial.print(" was pressed ");
Serial.print(inputCounter[output]);
Serial.println(" times.");
Serial.print("screenState = ");
Serial.println(screenState);
Serial.print("binaryValue = ");
Serial.println(binaryValue);
Serial.print("cursorPosX = ");
Serial.print(cursorPosX);
Serial.print(" cursorPosY = ");
Serial.println(cursorPosY);
Serial.print('\n');
}