Problem with function "epd_push_pixels(area, 50, 0);" And the functions "epd_draw_image(area3, framebuffer, WHITE_ON_BLACK);"

[SerjPr]

Hello. There are incomprehensible glitches. When using the epd_push_pixels(area, 50, 0); Should be a square. But on the sides there are additional lines. If the frame is in the middle, then there is only one line. When using the function epd_draw_image(area3, framebuffer, WHITE_ON_BLACK); A 50X50 square should be highlighted. But it turns out the line.

[SerjPr]

ifndef BOARD_HAS_PSRAM

error "Please enable PSRAM !!!"

endif

include "epd_driver.h"

uint8_t *framebuffer = NULL;

Rect_t area = { .x = 700, .y = 50, .width = 200, .height = 200, }; Rect_t area1 = { .x = 50, .y = 50, .width = 200, .height = 200, }; Rect_t area2 = { .x = 400, .y = 50, .width = 200, .height = 200, }; Rect_t area3 = { .x = 400, .y = 100, .width = 50, .height = 50, }; void setup() { framebuffer = (uint8_t )ps_calloc(sizeof(uint8_t), EPD_WIDTH EPD_HEIGHT / 2); if (!framebuffer) { Serial.println("alloc memory failed !!!"); while (1) ; } memset(framebuffer, 0xFF, EPD_WIDTH * EPD_HEIGHT / 2); epd_init(); epd_poweron(); delay(10); epd_clear(); epd_push_pixels(area, 50, 0); epd_push_pixels(area1, 50, 0); epd_push_pixels(area2, 50, 0); epd_draw_image(area3, framebuffer, WHITE_ON_BLACK); epd_poweroff(); } void loop() { }

[brianwyld]

My experience is that this problem is due to the byte/pixel ordering in the driver. display update is line by line in landscape orientation and alternate pixels are swapped.

Are you using a T5 (ESP32) or a T5-PLUS (ESP32S3), as the underlying IO transfer to the epaper uses a different driver (I2S on ESP32, esplcd on ESP32S3)?

[SerjPr]

My experience is that this problem is due to the byte/pixel ordering in the driver. display update is line by line in landscape orientation and alternate pixels are swapped.

Are you using a T5 (ESP32) or a T5-PLUS (ESP32S3), as the underlying IO transfer to the epaper uses a different driver (I2S on ESP32, esplcd on ESP32S3)?

I'm using ESP32-S3. I'm trying to do a partial screen refresh. There are examples of epd_clear_area(area); But this causes the update area to flicker. "epd_push_pixels" Causes two spurious streaks. And “epd_draw_image(area3, framebuffer, WHITE_ON_BLACK);” should highlight the specified area and highlights a horizontal stripe across the entire screen.

[brianwyld]

I ended up doing a lot of refactoring in the driver to get something I understood and that works for me with some issue still existing:

• partial refresh still degrades the untouched area after multiple updates
• faint lines round the updated areas
• not working well on ESP32 (ie with the I2S DMA code - sometimes does a 'double image' ie right shift by about 10 pixels of some of the N frames - some timing/sync issue when writing the row out with the DMA? or the RMT?)

the code is so changed from the original methods I don't think I would be able to propose it as a PR (especially as I wasn't aiming to keep any backwards compatibily as I wanted to use it from micropython)... maybe I could put it up on my github as a 'inspired by'?