Fix memory leak when deinitializing display feeder tasks

[vroland]

Towards #269 .

[vroland]

@aceisace Can you check if this fixes the issue?

[aceisace]

@vroland Yes sure, but I'll need a few days before I can test this due to some refactoring that is required when using the latest version of epdiy

[martinberlin]

Looking good. Will test it tonight! -> UPDATE: It works good. Maybe for this one will be nice to make a test that draws the Dragon, and deinits epdiy everytime, and checks that the RAM usage is stable. Although no idea if it's so easy to implement something like this.

[aceisace]

@vroland Hey, I finally had time to test this out today, but sadly, it does not fix the issue. This is the error this time:

assert failed: lq_init line_queue.c:23 (queue.bufs != NULL)

Backtrace: ... 
0x400823f9: panic_abort at ../esp/v4.4.6/esp-idf/components/esp_system/panic.c:408
0x400926a9: esp_system_abort at ../esp/v4.4.6/esp-idf/components/esp_system/esp_system.c:137
0x40099e09: __assert_func at ../esp/v4.4.6/esp-idf/components/newlib/assert.c:85
0x400f78b9: lq_init at ../esp-idf/test/components/epdiy-main/src/output_common/line_queue.c:23 (discriminator 1)
0x400f6bf1: epd_renderer_init at ../esp-idf/test/components/epdiy-main/src/render.c:322
0x400f6949: epd_init at ../esp-idf/test/components/epdiy-main/src/epdiy.c:491
0x400e74d2: loopTask(void*) at ../esp-idf/test/components/arduino/cores/esp32/main.cpp:42
0x40095d35: vPortTaskWrapper at ../esp/v4.4.6/esp-idf/components/freertos/port/xtensa/port.c:142

And the error is caused on this line:

epd_init(&epd_board_v5, &ED133UT2, EPD_LUT_64K);

It basically fails on the first initialisation of epdiy.

Additional Details:

• esp-idf version 4.4.6
• v5 board

[martinberlin]

That’s really strange in v7 works. Actually it is only on deinitialization. Are you sure nothing at all is changed in your side of the things? Wanted to reproduce it but I gave out all my v5 boards