ESP32 samples are stuck at "EPD_12in48_M1_ReadBusy ..."

[marcelstoer]

18:20:08.895 -> rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
18:20:08.895 -> configsip: 0, SPIWP:0xee
18:20:08.895 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
18:20:08.895 -> mode:DIO, clock div:1
18:20:08.895 -> load:0x3fff0018,len:4
18:20:08.895 -> load:0x3fff001c,len:1216
18:20:08.895 -> ho 0 tail 12 room 4
18:20:08.895 -> load:0x40078000,len:9720
18:20:08.895 -> ho 0 tail 12 room 4
18:20:08.895 -> load:0x40080400,len:6352
18:20:08.895 -> entry 0x400806b8
18:20:11.422 -> M1 Busying
18:20:11.422 -> M1 Busy free
18:20:11.951 -> EPD_12in48_Clear start ...
18:20:13.070 -> over ...
18:20:13.354 -> M1 Busying
18:20:13.354 -> M1 Busy free
18:20:13.572 -> EPD_12in48_M1_ReadBusy ...

The WiFi example behaves like that as well.

18:26:44.866 -> WiFi connected
18:26:44.866 -> Server started, ip: 192.168.1.216
18:26:44.866 -> HTTP server started
18:26:44.866 -> 
18:26:44.866 -> Ok!
18:26:44.866 -> 
18:29:13.631 -> 12.48inch e-Paper
18:29:14.020 -> M1 Busying
18:29:14.020 -> M1 Busy free
18:29:14.530 -> EPD_12in48_Clear start ...
18:29:15.624 -> over ...
18:29:18.361 -> Web_EPD_LoadA
18:29:18.361 -> 30000
18:29:18.361 -> Btime = 0
18:29:18.361 -> 12.48inch e-Paper LoadA S2
18:29:18.613 -> Web_EPD_LoadA
18:29:18.613 -> 30000
18:29:18.613 -> Btime = 15000
18:29:18.826 -> Web_EPD_LoadA
18:29:18.826 -> 30000
18:29:18.826 -> Btime = 30000
18:29:18.859 -> 12.48inch e-Paper LoadA M2
18:29:19.068 -> Web_EPD_LoadA
18:29:19.068 -> 30000
18:29:19.068 -> Btime = 45000
18:29:19.278 -> Web_EPD_LoadA
18:29:19.278 -> 30000
18:29:19.278 -> Btime = 60000
18:29:19.523 -> Web_EPD_LoadA
18:29:19.523 -> 30000
18:29:19.523 -> Btime = 75000
18:29:19.557 -> 12.48inch e-Paper LoadA M1
18:29:19.731 -> Web_EPD_LoadA
18:29:19.731 -> 30000
18:29:19.731 -> Btime = 90000
18:29:19.975 -> Web_EPD_LoadA
18:29:19.975 -> 30000
18:29:19.975 -> Btime = 105000
18:29:20.185 -> Web_EPD_LoadA
18:29:20.185 -> 30000
18:29:20.185 -> Btime = 120000
18:29:20.185 -> 12.48inch e-Paper LoadA S1
18:29:20.431 -> Web_EPD_LoadA
18:29:20.431 -> 30000
18:29:20.431 -> Btime = 135000
18:29:20.613 -> Web_EPD_LoadA
18:29:20.613 -> 20784
18:29:20.613 -> Btime = 150000
18:29:20.717 -> Web_EPD_Show
18:29:20.717 -> 12.48inch e-Paper
18:29:20.997 -> M1 Busying
18:29:20.997 -> M1 Busy free
18:29:21.206 -> EPD_12in48_M1_ReadBusy ...

So, the do-while loop at https://github.com/waveshare/12.48inch-e-paper/blob/master/esp32/esp32-epd-12in48/src/utility/EPD_12in48.cpp#L419 never ends.

[hnwangkg-ezio]

Yes the routine is an infinite loop, so that you can always receive data

[marcelstoer]

Ok, but then why does epd12in48-demo.ino not work? It's stuck at "EPD_12in48_M1_ReadBusy ..." as shown in the first output.

[martinberlin]

Marcel if you use ESP32 I recommend you to try my component:
https://github.com/martinberlin/cale-idf/wiki/Model-wave12i48.h

To drive this display. Only issue is that you need to be familiar with ESP-IDF framework from Espressif to compile this. But is not complicated and it's a great framework to work with.