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labW3barnestr/Src/main.c

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+/*
+ * main.c
+ *
+ *  Created on: Dec 17, 2021
+ *  Author: Trevor Barnes
+ *  A driver file to demonstrate the implemented functionality of the LCD and keypad. This file
+ *  contains functionality for a simple 4-operation calculator with two operands.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include "lcd.h"
+#include "keypad.h"
+
+char mathKeys[] = {'1','2','3','+','4','5','6','-','7','8','9','x','*','0','=','/'};
+char mathNums[] = {'1','2','3','_','4','5','6','_','7','8','9','_','_','0','_','_'};
+char mathOper[] = {'_','_','_','+','_','_','_','-','_','_','_','x','*','_','_','/'};
+char calculation[5];
+
+void calculate(int operand1, int operand2, char operation) {
+	int result;
+	switch (operation) {
+		case '+':
+		result = operand1 + operand2;
+		break;
+		case '-':
+		result = operand1 - operand2;
+		break;
+		case 'x':
+		result = operand1 * operand2;
+		break;
+		default:
+		if (operand2 == 0) {
+			lcd_clear();
+			char divError[] = " Err: Undefined ";
+			lcd_print_string(divError);
+			return;
+		} else {
+			result = operand1 / operand2;
+		}
+	}
+	lcd_print_num(result);
+}
+
+void inputSequence() {
+	int currentKeyIndex;
+	lcd_clear();
+	int seqIndex = 0;
+
+	// While key != number, getKey
+	do {
+		currentKeyIndex = keypad_getKey()-1;
+		if (mathKeys[currentKeyIndex] == '*') {
+			return;
+		}
+	} while (mathKeys[currentKeyIndex] != mathNums[currentKeyIndex]);
+	calculation[seqIndex] = mathKeys[currentKeyIndex];
+	lcd_print_char(mathKeys[currentKeyIndex]);
+	seqIndex++;
+
+	// While key != operation, getKey
+	do {
+		currentKeyIndex = keypad_getKey()-1;
+		if(mathKeys[currentKeyIndex] == '*') {
+			return;
+		}
+	} while (mathKeys[currentKeyIndex] != mathOper[currentKeyIndex]);
+	calculation[seqIndex] = mathKeys[currentKeyIndex];
+	lcd_print_char(mathKeys[currentKeyIndex]);
+	seqIndex++;
+
+	// While key != number, getKey
+	do {
+		currentKeyIndex = keypad_getKey()-1;
+		if(mathKeys[currentKeyIndex] == '*') {
+			return;
+		}
+	} while (mathKeys[currentKeyIndex] != mathNums[currentKeyIndex]);
+	calculation[seqIndex] = mathKeys[currentKeyIndex];
+	lcd_print_char(mathKeys[currentKeyIndex]);
+	seqIndex++;
+
+	// While key != '='
+	do {
+		currentKeyIndex = keypad_getKey()-1;
+		if(mathKeys[currentKeyIndex] == '*') {
+			return;
+		}
+	} while (mathKeys[currentKeyIndex] != '=');
+	lcd_print_char(mathKeys[currentKeyIndex]);
+	// Calculate
+	calculate(calculation[0] -= '0', calculation[2] -= '0', calculation[1]);
+	do {
+		currentKeyIndex = keypad_getKey()-1;
+	} while (mathKeys[currentKeyIndex] != '*');
+}
+
+// main
+int main(){
+
+	// Initialize Components
+	keypad_init();
+	lcd_init();
+
+	// Prompt Message
+	char prompt1[]= "+- Calculator x/";
+	char prompt2[]= "  Push any key  ";
+	lcd_print_string(prompt1);
+	lcd_set_position(17);
+	lcd_print_string(prompt2);
+	keypad_getKey();
+
+	while(1) {
+		inputSequence();
+	}
+	return 0;
+}
+
+
+