avr/display/display.c

/*
Copyright 2022, Savanni D'Gerinel <savanni@luminescent-dreams.com>

This file is part of Savanni's AVR library.

Lumeto is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Lumeto is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
*/

#include <stdlib.h>
#include <display.h>
#include <util/delay.h>
#include <base.h>

void display_strobe_line(gpio_t *line) {
    set_line(line);
    _delay_us(100);
    clear_line(line);
    _delay_us(100);
}

void write_instruction(display_t *disp, uint8_t bitcode) {
    clear_line(&disp->register_select);
    sr_send_msb(&disp->reg, bitcode);
    _delay_ms(1);
    display_strobe_line(&disp->enable);
}

void write_char(display_t *disp, uint8_t bitcode) {
    set_line(&disp->register_select);
    sr_send_msb(&disp->reg, bitcode);
    _delay_ms(1);
    display_strobe_line(&disp->enable);
}

void display_init(display_t *disp) {
    sr_initialize(&disp->reg);
    set_line_direction(&disp->register_select, LINE_OUT);
    set_line_direction(&disp->enable, LINE_OUT);
    write_instruction(disp, 0b00111100);
}

void display_clear(display_t *disp) {
    write_instruction(disp, 0x01);
    write_instruction(disp, 0x02);
}

void display_enable(display_t *disp) {
    write_instruction(disp, 0x0e);
}

void display_write_message(display_t *disp, const char *msg) {
    for (size_t i = 0; msg[i] != 0; i++) {
        write_char(disp, msg[i]);
    }
}