LibSharp/lib_sharp.c
2025-06-23 22:51:08 +01:00

120 lines
3 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "hardware/gpio.h"
#include "hardware/spi.h"
#include "sharp_display.h"
uint8_t mirror_bytes(uint8_t byte)
{
uint8_t res = 0;
for (uint8_t x=0; x < 8; ++x) {
res = (res << 1) | (byte & 1);
byte >>= 1;
}
return res;
}
sharp_display_t sharp_display_new(uint16_t width, uint16_t height, spi_inst_t * spi, uint8_t cs)
{
gpio_put(cs, false);
sharp_display_t display = {
.width = width,
.height = height,
.cs = cs,
.vcom = CMD_VCOM,
.framebuffer = (uint8_t *)malloc((width * height) / 8),
.spi = (spi)
};
return display;
}
bool sharp_display_error(sharp_display_t * display)
{
return display == NULL || display->framebuffer == NULL;
}
void sharp_display_refresh_screen(sharp_display_t * display)
{
uint8_t spi_byte;
gpio_put(display->cs, 1);
sharp_display_toggle_vcom(display);
uint16_t line_size = display->width / 8;
spi_byte = display->vcom | CMD_WRITE;
spi_write_blocking(display->spi, &spi_byte, 1);
for (size_t i = 0; i < display->height; i += 1)
{
// Current line
spi_byte = mirror_bytes(i + 1);
spi_write_blocking(display->spi, &spi_byte, 1);
// Line data
for (size_t j = 0; j < line_size; j += 1)
{
spi_byte = mirror_bytes(display->framebuffer[(line_size * i) + j]);
spi_write_blocking(display->spi, &spi_byte, 1);
}
// End of line
spi_byte = 0b00000000;
spi_write_blocking(display->spi, &spi_byte, 1);
}
// End of transmission
spi_byte = 0b00000000;
spi_write_blocking(display->spi, &spi_byte, 1);
gpio_put(display->cs, 0);
}
void sharp_display_clear_screen(sharp_display_t * display)
{
gpio_put(display->cs, 1);
sharp_display_toggle_vcom(display);
memset(display->framebuffer, 0b00000000, (display->width * display->height) / 8);
uint8_t buff[2];
buff[0] = display->vcom | CMD_CLEAR;
buff[1] = 0b00000000;
spi_write_blocking(display->spi, buff, 2);
gpio_put(display->cs, 0);
}
void sharp_display_toggle_vcom(sharp_display_t * display)
{
display->vcom ^= CMD_VCOM;
}
void sharp_display_draw_pixel(sharp_display_t *display, uint16_t x, uint16_t y, sharp_color_t color)
{
if (x < 0 || x >= display->width || y < 0 || y >= display->height) return;
uint16_t pixel_in_byte = x % 8;
uint16_t column_in_bytes = (x - pixel_in_byte) / 8;
uint8_t mask = 0b000000001 << pixel_in_byte;
if (color == WHITE) {
display->framebuffer[y*(display->width / 8) + column_in_bytes] |= ~mask;
} else {
display->framebuffer[y*(display->width / 8) + column_in_bytes] &= ~mask;
}
}
void sharp_display_fill_screen(sharp_display_t * display, sharp_color_t color)
{
if (color == WHITE) {
memset(display->framebuffer, 0b11111111, (display->width * display->height) / 8);
} else {
memset(display->framebuffer, 0b00000000, (display->width * display->height) / 8);
}
}