mirror of
https://github.com/qmk/qmk_firmware
synced 2024-11-18 09:55:48 +00:00
284 lines
6.8 KiB
C
284 lines
6.8 KiB
C
/*
|
|
Copyright 2022
|
|
|
|
This program 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 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "hd44780.h"
|
|
#include "gpio.h"
|
|
#include "progmem.h"
|
|
#include "wait.h"
|
|
|
|
#ifndef HD44780_DATA_PINS
|
|
# error hd44780: no data pins defined!
|
|
#endif
|
|
|
|
#ifndef HD44780_RS_PIN
|
|
# error hd44780: no RS pin defined!
|
|
#endif
|
|
|
|
#ifndef HD44780_RW_PIN
|
|
# error hd44780: no R/W pin defined!
|
|
#endif
|
|
|
|
#ifndef HD44780_E_PIN
|
|
# error hd44780: no E pin defined!
|
|
#endif
|
|
|
|
static const pin_t data_pins[4] = HD44780_DATA_PINS;
|
|
|
|
#ifndef HD44780_DISPLAY_COLS
|
|
# define HD44780_DISPLAY_COLS 16
|
|
#endif
|
|
|
|
#ifndef HD44780_DISPLAY_LINES
|
|
# define HD44780_DISPLAY_LINES 2
|
|
#endif
|
|
|
|
#ifndef HD44780_DDRAM_LINE0_ADDR
|
|
# define HD44780_DDRAM_LINE0_ADDR 0x00
|
|
#endif
|
|
#ifndef HD44780_DDRAM_LINE1_ADDR
|
|
# define HD44780_DDRAM_LINE1_ADDR 0x40
|
|
#endif
|
|
|
|
#define HD44780_INIT_DELAY_MS 16
|
|
#define HD44780_ENABLE_DELAY_US 1
|
|
|
|
static void hd44780_latch(void) {
|
|
writePinHigh(HD44780_E_PIN);
|
|
wait_us(HD44780_ENABLE_DELAY_US);
|
|
writePinLow(HD44780_E_PIN);
|
|
}
|
|
|
|
void hd44780_write(uint8_t data, bool isData) {
|
|
writePin(HD44780_RS_PIN, isData);
|
|
writePinLow(HD44780_RW_PIN);
|
|
|
|
for (int i = 0; i < 4; i++) {
|
|
setPinOutput(data_pins[i]);
|
|
}
|
|
|
|
// Write high nibble
|
|
for (int i = 0; i < 4; i++) {
|
|
writePin(data_pins[i], (data >> 4) & (1 << i));
|
|
}
|
|
hd44780_latch();
|
|
|
|
// Write low nibble
|
|
for (int i = 0; i < 4; i++) {
|
|
writePin(data_pins[i], data & (1 << i));
|
|
}
|
|
hd44780_latch();
|
|
|
|
for (int i = 0; i < 4; i++) {
|
|
writePinHigh(data_pins[i]);
|
|
}
|
|
}
|
|
|
|
uint8_t hd44780_read(bool isData) {
|
|
uint8_t data = 0;
|
|
|
|
writePin(HD44780_RS_PIN, isData);
|
|
writePinHigh(HD44780_RW_PIN);
|
|
|
|
for (int i = 0; i < 4; i++) {
|
|
setPinInput(data_pins[i]);
|
|
}
|
|
|
|
writePinHigh(HD44780_E_PIN);
|
|
wait_us(HD44780_ENABLE_DELAY_US);
|
|
|
|
// Read high nibble
|
|
for (int i = 0; i < 4; i++) {
|
|
data |= (readPin(data_pins[i]) << i);
|
|
}
|
|
|
|
data <<= 4;
|
|
|
|
writePinLow(HD44780_E_PIN);
|
|
wait_us(HD44780_ENABLE_DELAY_US);
|
|
writePinHigh(HD44780_E_PIN);
|
|
wait_us(HD44780_ENABLE_DELAY_US);
|
|
|
|
// Read low nibble
|
|
for (int i = 0; i < 4; i++) {
|
|
data |= (readPin(data_pins[i]) << i);
|
|
}
|
|
|
|
writePinLow(HD44780_E_PIN);
|
|
|
|
return data;
|
|
}
|
|
|
|
bool hd44780_busy(void) {
|
|
return hd44780_read(false) & HD44780_BUSY_FLAG;
|
|
}
|
|
|
|
void hd44780_command(uint8_t command) {
|
|
while (hd44780_busy())
|
|
;
|
|
hd44780_write(command, false);
|
|
}
|
|
|
|
void hd44780_data(uint8_t data) {
|
|
while (hd44780_busy())
|
|
;
|
|
hd44780_write(data, true);
|
|
}
|
|
|
|
void hd44780_clear(void) {
|
|
hd44780_command(HD44780_CMD_CLEAR_DISPLAY);
|
|
}
|
|
|
|
void hd44780_home(void) {
|
|
hd44780_command(HD44780_CMD_RETURN_HOME);
|
|
}
|
|
|
|
void hd44780_on(bool cursor, bool blink) {
|
|
if (cursor) {
|
|
if (blink) {
|
|
hd44780_command(HD44780_CMD_DISPLAY | HD44780_DISPLAY_ON | HD44780_DISPLAY_CURSOR | HD44780_DISPLAY_BLINK);
|
|
} else {
|
|
hd44780_command(HD44780_CMD_DISPLAY | HD44780_DISPLAY_ON | HD44780_DISPLAY_CURSOR);
|
|
}
|
|
} else {
|
|
hd44780_command(HD44780_CMD_DISPLAY | HD44780_DISPLAY_ON);
|
|
}
|
|
}
|
|
|
|
void hd44780_off() {
|
|
hd44780_command(HD44780_CMD_DISPLAY);
|
|
}
|
|
|
|
void hd44780_set_cgram_address(uint8_t address) {
|
|
hd44780_command(HD44780_CMD_SET_CGRAM_ADDRESS + (address & 0x3F));
|
|
}
|
|
|
|
void hd44780_set_ddram_address(uint8_t address) {
|
|
hd44780_command(HD44780_CMD_SET_DDRAM_ADDRESS + (address & 0x7F));
|
|
}
|
|
|
|
void hd44780_init(bool cursor, bool blink) {
|
|
setPinOutput(HD44780_RS_PIN);
|
|
setPinOutput(HD44780_RW_PIN);
|
|
setPinOutput(HD44780_E_PIN);
|
|
|
|
for (int i = 0; i < 4; i++) {
|
|
setPinOutput(data_pins[i]);
|
|
}
|
|
|
|
wait_ms(HD44780_INIT_DELAY_MS);
|
|
|
|
// Manually configure for 4-bit mode - can't use hd44780_command() yet
|
|
// HD44780U datasheet, Fig. 24 (p46)
|
|
writePinHigh(data_pins[0]); // Function set
|
|
writePinHigh(data_pins[1]); // DL = 1
|
|
hd44780_latch();
|
|
wait_ms(5);
|
|
// Send again
|
|
hd44780_latch();
|
|
wait_us(64);
|
|
// And again (?)
|
|
hd44780_latch();
|
|
wait_us(64);
|
|
|
|
writePinLow(data_pins[0]); // DL = 0
|
|
hd44780_latch();
|
|
wait_us(64);
|
|
|
|
#if HD44780_DISPLAY_LINES == 1
|
|
hd44780_command(HD44780_CMD_FUNCTION); // 4 bit, 1 line, 5x8 dots
|
|
#else
|
|
hd44780_command(HD44780_CMD_FUNCTION | HD44780_FUNCTION_2_LINES); // 4 bit, 2 lines, 5x8 dots
|
|
#endif
|
|
hd44780_on(cursor, blink);
|
|
hd44780_clear();
|
|
hd44780_home();
|
|
hd44780_command(HD44780_CMD_ENTRY_MODE | HD44780_ENTRY_MODE_INC);
|
|
}
|
|
|
|
void hd44780_set_cursor(uint8_t col, uint8_t line) {
|
|
register uint8_t address = col;
|
|
|
|
#if HD44780_DISPLAY_LINES == 1
|
|
address += HD44780_DDRAM_LINE0_ADDR;
|
|
#elif HD44780_DISPLAY_LINES == 2
|
|
if (line == 0) {
|
|
address += HD44780_DDRAM_LINE0_ADDR;
|
|
} else {
|
|
address += HD44780_DDRAM_LINE1_ADDR;
|
|
}
|
|
#endif
|
|
|
|
hd44780_set_ddram_address(address);
|
|
}
|
|
|
|
void hd44780_define_char(uint8_t index, uint8_t *data) {
|
|
hd44780_set_cgram_address((index & 0x7) << 3);
|
|
for (uint8_t i = 0; i < 8; i++) {
|
|
hd44780_data(data[i]);
|
|
}
|
|
}
|
|
|
|
void hd44780_putc(char c) {
|
|
while (hd44780_busy())
|
|
;
|
|
uint8_t current_position = hd44780_read(false);
|
|
|
|
if (c == '\n') {
|
|
hd44780_set_cursor(0, current_position < HD44780_DDRAM_LINE1_ADDR ? 1 : 0);
|
|
} else {
|
|
#if defined(HD44780_WRAP_LINES)
|
|
# if HD44780_DISPLAY_LINES == 1
|
|
if (current_position == HD44780_DDRAM_LINE0_ADDR + HD44780_DISPLAY_COLS) {
|
|
// Go to start of line
|
|
hd44780_set_cursor(0, 0);
|
|
}
|
|
# elif HD44780_DISPLAY_LINES == 2
|
|
if (current_position == HD44780_DDRAM_LINE0_ADDR + HD44780_DISPLAY_COLS) {
|
|
// Go to start of second line
|
|
hd44780_set_cursor(0, 1);
|
|
} else if (current_position == HD44780_DDRAM_LINE1_ADDR + HD44780_DISPLAY_COLS) {
|
|
// Go to start of first line
|
|
hd44780_set_cursor(0, 0);
|
|
}
|
|
# endif
|
|
#endif
|
|
hd44780_data(c);
|
|
}
|
|
}
|
|
|
|
void hd44780_puts(const char *s) {
|
|
register char c;
|
|
while ((c = *s++)) {
|
|
hd44780_putc(c);
|
|
}
|
|
}
|
|
|
|
#if defined(__AVR__)
|
|
void hd44780_define_char_P(uint8_t index, const uint8_t *data) {
|
|
hd44780_set_cgram_address(index << 3);
|
|
for (uint8_t i = 0; i < 8; i++) {
|
|
hd44780_data(pgm_read_byte(data++));
|
|
}
|
|
}
|
|
|
|
void hd44780_puts_P(const char *s) {
|
|
register char c;
|
|
while ((c = pgm_read_byte(s++))) {
|
|
hd44780_putc(c);
|
|
}
|
|
}
|
|
#endif
|