lvgl_esp32_drivers/lvgl_tft/epdiy_epaper.cpp

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#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "epdiy_epaper.h"
#include "epd_driver.h"
#include "epd_highlevel.h"
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EpdiyHighlevelState hl;
uint16_t flushcalls = 0;
uint8_t * framebuffer;
uint8_t temperature = 25;
bool init = true;
#define BUF_MAX 111600
/* Display initialization routine */
void epdiy_init(void)
{
epd_init(EPD_OPTIONS_DEFAULT);
hl = epd_hl_init(EPD_BUILTIN_WAVEFORM);
framebuffer = epd_hl_get_framebuffer(&hl);
epd_poweron();
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//Clear all always in init:
epd_fullclear(&hl, temperature);
}
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/* A copy from epd_copy_to_framebuffer with temporary lenght prediction */
void buf_copy_to_framebuffer(EpdRect image_area, const uint8_t *image_data) {
assert(framebuffer != NULL);
for (uint32_t i = 0; i < image_area.width * image_area.height; i++) {
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// Get out if we get the end of the buffer. Question: How to detect the end without a lenght?
// Zero terminator check gets out before: (image_data[value_index / 2]== '\0')
// 111684 seems to be the last element in image_data
if (i / 2 > BUF_MAX) {
printf("FOUND END incr:%d Aw:%d Ah:%d\n", i, image_area.width, image_area.height);
break;
}
uint8_t val = (i % 2) ? (image_data[i / 2] & 0xF0) >> 4
: image_data[i / 2] & 0x0F;
int xx = image_area.x + i % image_area.width;
if (xx < 0 || xx >= EPD_WIDTH) {
continue;
}
int yy = image_area.y + i / image_area.width;
if (yy < 0 || yy >= EPD_HEIGHT) {
continue;
}
uint8_t *buf_ptr = &framebuffer[yy * EPD_WIDTH / 2 + xx / 2];
if (xx % 2) {
*buf_ptr = (*buf_ptr & 0x0F) | (val << 4);
} else {
*buf_ptr = (*buf_ptr & 0xF0) | val;
}
}
}
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/* Required by LVGL. Sends the color_map to the screen with a partial update */
void epdiy_flush(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_map)
{
++flushcalls;
uint16_t w = lv_area_get_width(area);
uint16_t h = lv_area_get_height(area);
EpdRect update_area = {
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.x = (uint16_t)area->x1,
.y = (uint16_t)area->y1,
.width = w,
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.height = h
};
uint8_t* buf = (uint8_t *) color_map;
// Buffer debug
/*
for (int index=0; index<400; index++) {
printf("%x ", buf[index]);
} */
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// Does not work for full screen update yet (Should check large of buf)
buf_copy_to_framebuffer(update_area, buf);
epd_hl_update_area(&hl, MODE_GC16, temperature, update_area); //update_area
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printf("epdiy_flush %d x:%d y:%d w:%d h:%d\n", flushcalls,(uint16_t)area->x1,(uint16_t)area->y1,w,h);
/* Inform the graphics library that you are ready with the flushing */
lv_disp_flush_ready(drv);
}
/*
* Called for each pixel. Designed with the idea to fill the buffer directly, not to set each pixel, see:
* https://forum.lvgl.io/t/lvgl-port-to-be-used-with-epaper-displays/5630/3
*/
void epdiy_set_px_cb(lv_disp_drv_t * disp_drv, uint8_t* buf,
lv_coord_t buf_w, lv_coord_t x, lv_coord_t y,
lv_color_t color, lv_opa_t opa)
{
// Debug
if (init) {
printf("Initialize *buf with white\n\n");
for (int i=0; i<BUF_MAX; i++) {
buf[i] = 0xff;
}
init = false;
}
// Test using RGB232
int16_t epd_color = 255;
if ((int16_t)color.full<250) {
epd_color = (int16_t)color.full/3;
}
//Instead of using epd_draw_pixel: Set pixel directly in *buf that comes afterwards in flush as *color_map
uint16_t idx = (int16_t)y * buf_w / 2 + (int16_t)x / 2;
if (x % 2) {
buf[idx] = (buf[idx] & 0x0F) | (epd_color & 0xF0);
} else {
buf[idx] = (buf[idx] & 0xF0) | (epd_color >> 4);
}
}