101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
#include <avr/io.h>
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#include <util/delay.h>
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#include <base.h>
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#include <spi.h>
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#include <reg.h>
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typedef struct HD44780 {
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shift_register_t reg;
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gpio_t register_select;
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gpio_t enable;
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} hd44780_t;
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void strobe_line(gpio_t *line) {
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set_line(line);
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_delay_ms(1);
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clear_line(line);
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_delay_ms(1);
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}
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void hd44780_init(hd44780_t *disp) {
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spi_initialize(disp);
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set_line_direction(&disp->register_select, LINE_OUT);
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set_line_direction(&disp->enable, LINE_OUT);
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send_msb(&disp->reg, 0b00111100);
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}
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void hd44780_clear(hd44780_t *disp) {
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clear_line(&disp->register_select);
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send_msb(&disp->reg, 0b00000001);
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_delay_ms(1);
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strobe_line(&disp->enable);
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send_msb(&disp->reg, 0b00000010);
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_delay_ms(1);
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strobe_line(&disp->enable);
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}
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void hd44780_display(hd44780_t *disp) {
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clear_line(&disp->register_select);
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send_msb(&disp->reg, 0b00001110);
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_delay_ms(1);
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strobe_line(&disp->enable);
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}
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void hd44780_write_char(hd44780_t *disp, uint8_t bitcode) {
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set_line(&disp->register_select);
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send_msb(&disp->reg, bitcode);
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strobe_line(&disp->enable);
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}
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void hd44780_write(hd44780_t *disp) {
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set_line(&disp->register_select);
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hd44780_write_char(disp, 0b01001000);
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hd44780_write_char(disp, 0b01000101);
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hd44780_write_char(disp, 0b01001100);
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hd44780_write_char(disp, 0b01001100);
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hd44780_write_char(disp, 0b01001111);
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hd44780_write_char(disp, 0b00101100);
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hd44780_write_char(disp, 0b00100000);
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hd44780_write_char(disp, 0b01001101);
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hd44780_write_char(disp, 0b01011001);
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hd44780_write_char(disp, 0b00100000);
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hd44780_write_char(disp, 0b01000010);
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hd44780_write_char(disp, 0b01000001);
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hd44780_write_char(disp, 0b01010100);
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}
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int main(void) {
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hd44780_t display = {
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.reg = {
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.output = { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 5 },
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.latch_clock = { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 6 },
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.shift_clock = { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 7 },
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},
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.register_select = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 1 },
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.enable = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 0 },
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};
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gpio_t light = { .ddr = &DDRC, .port = &PORTC, .pin = &PINC, .addr = 7 };
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set_line_direction(&light, LINE_OUT);
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clear_line(&light);
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hd44780_init(&display);
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hd44780_clear(&display);
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_delay_ms(500);
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hd44780_write(&display);
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hd44780_display(&display);
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set_line(&light);
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while(1) { _delay_ms(1); }
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}
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