Fix screen refresh

This commit is contained in:
Michał Gdula 2025-06-23 22:51:08 +01:00
parent ef0bb65fdf
commit 6db323c570
2 changed files with 85 additions and 54 deletions

View file

@ -3,7 +3,19 @@
#include <string.h>
#include "hardware/gpio.h"
#include "hardware/spi.h"
#include "lib_sharp.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)
{
@ -23,73 +35,86 @@ sharp_display_t sharp_display_new(uint16_t width, uint16_t height, spi_inst_t *
bool sharp_display_error(sharp_display_t * display)
{
return (display == NULL || display->framebuffer == NULL);
return display == NULL || display->framebuffer == NULL;
}
void sharp_display_refresh_screen(sharp_display_t * display)
{
gpio_put(display->cs, true);
uint8_t spi_byte;
gpio_put(display->cs, 1);
sharp_display_toggle_vcom(display);
// These are sizes without the current line and end of line data
uint16_t line_size = display->width / 8;
uint16_t frame_size = (display->width * display->height) / 8;
uint16_t buff_size = 1 + display->height * (1 + (display->width / 8) + 1) + 1;
uint8_t buff[buff_size];
spi_byte = display->vcom | CMD_WRITE;
spi_write_blocking(display->spi, &spi_byte, 1);
uint16_t buff_offset = 0;
buff[buff_offset] = display->vcom | CMD_WRITE;
buff_offset += 1;
for (int i = 0; i < frame_size; i += line_size)
for (size_t i = 0; i < display->height; i += 1)
{
// Current line
buff[buff_offset] = ((i + 1) / (display->width / 8)) + 1;
buff_offset += 1;
spi_byte = mirror_bytes(i + 1);
spi_write_blocking(display->spi, &spi_byte, 1);
// Line data
memcpy(buff + buff_offset, display->framebuffer + i, line_size);
buff_offset += line_size;
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
buff[buff_offset] = 0x00;
buff_offset += 1;
spi_byte = 0b00000000;
spi_write_blocking(display->spi, &spi_byte, 1);
}
// End of transition
buff[buff_offset] = 0x00;
buff_offset += 1;
// End of transmission
spi_byte = 0b00000000;
spi_write_blocking(display->spi, &spi_byte, 1);
if (buff_size != buff_offset)
{
printf("Sussy buffer size offset\n");
}
spi_write_blocking(display->spi, buff, buff_offset);
gpio_put(display->cs, false);
gpio_put(display->cs, 0);
}
void sharp_display_clear_screen(sharp_display_t * display)
{
sharp_display_clear_buffer(display);
gpio_put(display->cs, true);
gpio_put(display->cs, 1);
sharp_display_toggle_vcom(display);
uint8_t buff[2] = {display->vcom | CMD_CLEAR, 0x00};
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);
sharp_display_toggle_vcom(display);
gpio_put(display->cs, false);
}
void sharp_display_clear_buffer(sharp_display_t * display)
{
memset(display->framebuffer, 0, display->width * display->height / 8);
gpio_put(display->cs, 0);
}
void sharp_display_toggle_vcom(sharp_display_t * display)
{
display->vcom = display->vcom ? 0x00 : CMD_VCOM;
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);
}
}

View file

@ -1,30 +1,36 @@
#ifndef LIB_SHARP_H
#define LIB_SHARP_H
#ifndef SHARP_DISPLAY
#define SHARP_DISPLAY
#include "hardware/spi.h"
#define CMD_WRITE 0x80
#define CMD_CLEAR 0x20
#define CMD_VCOM 0x40
// in LSB format
#define CMD_WRITE 0b10000000
#define CMD_VCOM 0b01000000
#define CMD_CLEAR 0b00100000
#define SWAP(a, b) { a ^= b; b ^= a; a ^= b; }
typedef enum sharp_color
{
WHITE = 0,
BLACK = 1,
}
sharp_color_t;
typedef struct sharp_display {
typedef struct sharp_display
{
uint16_t width, height;
uint8_t cs;
uint8_t vcom;
uint8_t * framebuffer;
spi_inst_t * spi;
} sharp_display_t;
}
sharp_display_t;
sharp_display_t sharp_display_new(uint16_t width, uint16_t height, spi_inst_t * spi, uint8_t cs);
bool sharp_display_error(sharp_display_t * display);
void sharp_display_refresh_screen(sharp_display_t * display);
void sharp_display_clear_screen(sharp_display_t * display);
void sharp_display_clear_buffer(sharp_display_t * display);
void sharp_display_toggle_vcom(sharp_display_t * display);
void sharp_display_draw_pixel(sharp_display_t *display, uint16_t x, uint16_t y, sharp_color_t color);
void sharp_display_fill_screen(sharp_display_t * display, sharp_color_t color);
void sharp_display_draw_pixel(sharp_display_t *display, int x, int y, bool color);
void sharp_display_draw_circle(sharp_display_t *display, int x0, int y0, int radius, bool color);
#endif //LIB_SHARP_H
#endif