128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/*
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Copyright 2022, Savanni D'Gerinel <savanni@luminescent-dreams.com>
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This file is part of Savanni's AVR library.
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This AVR library 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.
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This AVR library 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.
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You should have received a copy of the GNU General Public License along with this AVR library. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <dio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <util/delay.h>
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#include "display.h"
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#define ENABLE _BV(5)
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#define CHARCODE _BV(4)
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void ping(dio_t *light) {
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dio_set(light, 1);
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_delay_ms(100);
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dio_set(light, 0);
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_delay_ms(100);
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}
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void send_half_code(display_t *disp, uint8_t reg, uint8_t data) {
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sr_send_msb(&disp->reg, (reg ? CHARCODE : 0) | data << 2);
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_delay_us(1);
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sr_send_msb(&disp->reg, (ENABLE | (reg ? CHARCODE : 0) | data) << 2);
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_delay_us(1);
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sr_send_msb(&disp->reg, ((reg ? CHARCODE : 0) | data) << 2);
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_delay_us(1);
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}
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void send_code(display_t *disp, uint8_t reg, uint8_t data) {
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send_half_code(disp, reg, data >> 4);
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send_half_code(disp, reg, data & 0xf);
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}
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void write_instruction(display_t *disp, uint8_t bitcode) {
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send_code(disp, 0, bitcode);
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}
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void write_char(display_t *disp, uint8_t bitcode) {
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send_code(disp, 1, bitcode);
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_delay_us(100);
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}
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void display_init(display_t *disp) {
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sr_initialize(&disp->reg);
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/* Initializing for 4-bit channel */
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send_half_code(disp, 0, 0b0011);
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_delay_ms(5);
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send_half_code(disp, 0, 0b0011);
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_delay_us(150);
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send_half_code(disp, 0, 0b0011);
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_delay_us(100);
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send_half_code(disp, 0, 0b0010);
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_delay_us(100);
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/* Function set, 4-bit channel, two lines, 5x10 dots */
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write_instruction(disp, 0b00101000);
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_delay_us(100);
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/* display off */
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write_instruction(disp, 0b00001000);
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_delay_us(100);
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/* display clear */
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write_instruction(disp, 0b00000001);
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_delay_ms(3);
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/* set entry mode */
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write_instruction(disp, 0b00000110);
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_delay_us(100);
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/* display on */
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write_instruction(disp, 0b00001100);
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_delay_us(100);
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}
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void display_clear(display_t *disp) {
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write_instruction(disp, 0b00000001);
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_delay_us(100);
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write_instruction(disp, 0b00000010);
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_delay_us(100);
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}
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void display_enable(display_t *disp) {
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write_instruction(disp, _BV(5));
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_delay_us(100);
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write_instruction(disp, _BV(5) | _BV(3));
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_delay_us(100);
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}
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void display_set_location(display_t *disp, size_t row, size_t column) {
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size_t addr = row * 40 + column;
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write_instruction(disp, 0b10000000 | addr);
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_delay_us(100);
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}
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void display_write_message(display_t *disp, const char *msg) {
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for (size_t i = 0; msg[i] != 0; i++) {
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write_char(disp, msg[i]);
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}
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}
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void display_write_bit_pattern(display_t *disp, const uint8_t pattern) {
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char msg[16];
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sprintf(msg, "* ");
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for (int i = 7; i >= 0; i--) {
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if (pattern & _BV(i)) {
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display_write_message(disp, "1");
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} else {
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display_write_message(disp, "0");
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}
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}
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}
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