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labW3barnestr/Src/lcd.c

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+/*
+ * lcd.c
+ *
+ *  Created on: Dec 17, 2020
+ *  Author: Trevor Barnes
+ */
+
+#include "lcd.h"
+#include "delay.h"
+#include <inttypes.h>
+#include <stdio.h>
+
+
+
+void writeInstruction(uint8_t inst) {
+	// Reset RS, RW, E
+	*GPIOC_ODR &= ~(RS);
+	*GPIOC_ODR &= ~(RW);
+	*GPIOC_ODR &= ~(E);
+	// Set E
+	*GPIOC_ODR |= (E);
+	// Clear databus
+	*GPIOA_ODR &= ~(0xFF<<4);
+	// Set databus to passed in instruction value
+	*GPIOA_ODR |= (inst<<4);
+	// Reset E
+	*GPIOC_ODR &= ~(E);
+	delay_us(37);
+}
+
+void writeData(uint8_t inst) {
+	// Reset RW, E
+	*GPIOC_ODR &= ~(RW);
+	*GPIOC_ODR &= ~(E);
+	// Set RS
+	*GPIOC_ODR |= (RS);
+	// Set E
+	*GPIOC_ODR |= (E);
+	// Clear databus
+	*GPIOA_ODR &= ~(0xFF<<4);
+	// Set databus to passed in instruction value
+	*GPIOA_ODR |= (inst<<4);
+	// Reset E
+	*GPIOC_ODR &= ~(E);
+	delay_us(37);
+}
+
+void lcd_init(){
+
+// Port Setup
+	// Enable GPIO A and C in RCC
+	*RCC_AHB1ENR |= (GPIOAEN||GPIOCEN);
+	// Set DB pins to outputs
+	*GPIOA_MODER &= ~(0xFFFF<<8);
+	*GPIOA_MODER |= (0x5555<<8);
+	// Set RS, RW, and E pins to outputs
+	*GPIOC_MODER &= ~(0x3F<<16);
+	*GPIOC_MODER |= (0x15<<16);
+	// Delay for 40 ms
+	delay_ms(40);
+
+// Display Setup
+	// Write Function Set
+	writeInstruction(FUNCTION_SET);
+	delay_us(37);
+	// Write Function Set
+	writeInstruction(FUNCTION_SET);
+	delay_us(37);
+	// Write Display On
+	writeInstruction(DISPLAY_TOGGLE);
+	delay_us(37);
+	// Write Display Clear
+	writeInstruction(DISPLAY_CLEAR);
+	delay_ms(2);
+	// Write Entry Mode Set
+	writeInstruction(ENTRY_MODE_SET);
+	delay_us(37);
+
+}
+
+void lcd_clear(){
+	writeInstruction(DISPLAY_CLEAR);
+	delay_ms(2);
+}
+
+void lcd_home() {
+	writeInstruction(0x80);
+	delay_ms(2);
+}
+
+void lcd_set_position(uint8_t posIndex) {
+	posIndex--;
+	int inst = 0x80;
+	if (posIndex > 15) {
+		inst |= (1<<6);
+		posIndex -= 16;
+	}
+	inst |= posIndex;
+	writeInstruction(inst);
+}
+
+int lcd_print_string(char* str) {
+	int index = 0;
+	while (str[index] != 0x00) {
+		writeData(str[index]);
+		index++;
+	}
+	return index;
+}
+
+void lcd_print_char(char c) {
+	writeData(c);
+}
+
+
+int lcd_print_num(int i){
+	char numString[17];
+	sprintf(numString, "%d", i);
+	return lcd_print_string(numString);
+}