LCDinoBytes/lcd.c at main · AlwaysOscar/LCDinoBytes · GitHub

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#include "avr.h"
#include "lcd.h"

#define RS_PIN 0
#define RW_PIN 1
#define EN_PIN 2

void set_data(unsigned char x)
{
	PORTD = x;
	DDRD = 0xff;
}

static unsigned char get_data(void)
{
	DDRD = 0x00;
	return PIND;
}

static inline void sleep_700ns(void)
{
	NOP();
	NOP();
	NOP();
}

static unsigned char input(unsigned char rs)
{
	unsigned char d;

	if (rs) {
		SET_BIT(PORTB, RS_PIN);
	}
	else {
		CLR_BIT(PORTB, RS_PIN);
	}
	SET_BIT(PORTB, RW_PIN);
	get_data(); // Note: Return value ignored here
	SET_BIT(PORTB, EN_PIN);
	// avr_wait(7);
	d = get_data();
	CLR_BIT(PORTB, EN_PIN);
	return d;
}

static void output(unsigned char d, unsigned char rs)
{
	if (rs) {
		SET_BIT(PORTB, RS_PIN);
	}
	else {
		CLR_BIT(PORTB, RS_PIN);
	}
	CLR_BIT(PORTB, RW_PIN);
	set_data(d);
	SET_BIT(PORTB, EN_PIN);
	// avr_wait(7);
	CLR_BIT(PORTB, EN_PIN);
}

void write(unsigned char c, unsigned char rs)
{
	while (input(0) & 0x80); // Module Busy check
	output(c, rs);
}

void lcd_init(void)
{
	SET_BIT(DDRB, RS_PIN);
	SET_BIT(DDRB, RW_PIN);
	SET_BIT(DDRB, EN_PIN);
	avr_wait(16);
	output(0x30, 0);
	avr_wait(5);
	output(0x30, 0);
	avr_wait(1);
	write(0x3c, 0);
	write(0x0c, 0);
	write(0x06, 0);
	write(0x01, 0);
}

void lcd_clr(void)
{
	write(0x01, 0);
}

void lcd_pos(unsigned char r, unsigned char c)
{
	unsigned char n = r * 40 + c;
	write(0x02, 0);
	while (n--) {
		write(0x14, 0);
	}
}

void lcd_put(char c)
{
	write(c, 1);
}

void lcd_puts1(const char *s)
{
	char c;
	while ((c = pgm_read_byte(s++)) != 0) {
		write(c, 1);
	}
}

void lcd_puts2(const char *s)
{
	char c;
	while ((c = *(s++)) != 0) {
		write(c, 1);
	}
}