Multiple displays Oled with u8g2 Library

[allacmc]

I am using a library called u8g2 to display the data on the i2c oled display.

This library "Originally made for Arduino" I can make it work with a port made by a colleague.

And it works perfectly.

I have a 16 channel multiplexer and everything is mounted on the breadboard. Working perfectly.

https://github.com/mkfrey/u8g2-hal-esp-idf

I use this library below to port and it works perfectly.

Code: [Select all] [Expand/Collapse]

1. #include <u8g2.h>
2. #include "sdkconfig.h"
3. #include "u8g2_esp32_hal.h"
4.  
5. #define PIN_SDA 21
6. #define PIN_SCL 22
7.  
8. u8g2_t u8g2;
9. u8g2_t u8g2_1;
10.  
11. void f_setupI2c(){
12.  
13.     selectChannel(1);//Select Display 2
14.         u8g2_esp32_hal_t u8g2_esp32_hal = U8G2_ESP32_HAL_DEFAULT;
15.         u8g2_esp32_hal.bus.i2c.sda = PIN_SDA;
16.         u8g2_esp32_hal.bus.i2c.scl = PIN_SCL;
17.         u8g2_esp32_hal_init(u8g2_esp32_hal);
18.  
19.         u8g2_Setup_sh1106_i2c_128x64_noname_f(&u8g2, U8G2_R0,u8g2_esp32_i2c_byte_cb,u8g2_esp32_gpio_and_delay_cb);
20.         u8x8_SetI2CAddress(&u8g2.u8x8, 0x78);
21.         u8g2_InitDisplay(&u8g2);
22.         u8g2_SetPowerSave(&u8g2, 0);
23.         u8g2_ClearBuffer(&u8g2);
24.         u8g2_SetFont(&u8g2, u8g2_font_ncenB10_tr);
25.         u8g2_DrawStr(&u8g2, 0, 17, "ENERVISION");
26.         u8g2_SendBuffer(&u8g2);
27.    
28.     selectChannel(3); //Select Display 3
29.         /*
30.         u8g2_Setup_sh1106_i2c_128x64_noname_f(&u8g2_1, U8G2_R0,u8g2_esp32_i2c_byte_cb,u8g2_esp32_gpio_and_delay_cb);
31.         u8x8_SetI2CAddress(&u8g2_1.u8x8, 0x78);
32.         u8g2_InitDisplay(&u8g2_1);
33.         u8g2_SetPowerSave(&u8g2_1, 0);
34.         u8g2_ClearBuffer(&u8g2_1);
35.         u8g2_SetFont(&u8g2_1, u8g2_font_ncenB10_tr);
36.         u8g2_DrawStr(&u8g2_1, 0, 17, "ENERVISION");
37.         u8g2_SendBuffer(&u8g2_1);
38.         */
39.  
40. }

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However, when I repeat the code to create a new u8g2 object, it gives an error during execution.

I'm lost on how to solve this problem, which way to go. He knows

Where am I going wrong?

Code: [Select all] [Expand/Collapse]

1. I (872) wifi_init: tcp tx win: 5760
2. I (872) wifi_init: tcp rx win: 5760
3. I (872) wifi_init: tcp mss: 1440
4. I (882) wifi_init: WiFi IRAM OP enabled
5. I (882) wifi_init: WiFi RX IRAM OP enabled
6. I (892) phy_init: phy_version 4791,2c4672b,Dec 20 2023,16:06:06
7. I (982) wifi:mode : sta (08:d1:f9:e1:06:60)
8. I (982) wifi:enable tsf
9. I (992) INFO: Wifi-Conectando...
10. I (1002) wifi:new:<11,0>, old:<1,0>, ap:<255,255>, sta:<11,0>, prof:1
11. I (1002) wifi:state: init -> auth (b0)
12. I (1012) wifi:state: auth -> assoc (0)
13. W (1012) Multiplexer: Canal 1 - (1 0 0 0)
14. I (1012) u8g2_hal: sda_io_num 21
15. I (1012) wifi:state: assoc -> run (10)
16. I (1012) u8g2_hal: scl_io_num 22
17. I (1022) u8g2_hal: clk_speed 50000
18. I (1022) u8g2_hal: i2c_param_config 1
19. I (1032) u8g2_hal: i2c_driver_install 1
20. I (1252) wifi:<ba-add>idx:0 (ifx:0, 38:6b:1c:01:ea:a8), tid:0, ssn:462, winSize:64
21. I (1262) wifi:connected with WifiStudio, aid = 7, channel 11, BW20, bssid = 38:6b:1c:01:ea:a8
22. I (1262) wifi:security: WPA2-PSK, phy: bgn, rssi: -54
23. I (1272) wifi:pm start, type: 1
24.  
25. I (1272) wifi:dp: 1, bi: 102400, li: 3, scale listen interval from 307200 us to 307200 us
26. I (1282) INFO: Wifi-Conectado
27. I (1342) wifi:AP's beacon interval = 102400 us, DTIM period = 1
28. W (1342) wifi:[ADDBA]rx delba, code:39, delete tid:0
29. I (1342) wifi:<ba-del>idx:0, tid:0
30. W (1602) Multiplexer: Canal 3 - (1 1 0 0)
31. I (1602) u8g2_hal: sda_io_num 21
32. I (1602) u8g2_hal: scl_io_num 22
33. I (1602) u8g2_hal: clk_speed 50000
34. I (1602) u8g2_hal: i2c_param_config 1
35. I (1612) u8g2_hal: i2c_driver_install 1
36. E (1612) i2c: i2c driver install error
37. E (1612) err: esp_err_t = -1
38.  
39. assert failed: u8g2_esp32_i2c_byte_cb u8g2_esp32_hal.c:148 (0 && "i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0)")
40.  
41.  
42. Backtrace: 0x40081bae:0x3ffba780 0x4008a471:0x3ffba7a0 0x40092795:0x3ffba7c0 0x400db513:0x3ffba8e0 0x400db129:0x3ffba920 0x400db177:0x3ffba940 0x400db321:0x3ffba960 0x401661ed:0x3ffba980 0x400d92e9:0x3ffba9a0 0x400d8850:0x3ffba9e0 0x4016d47b:0x3ffbaa80 0x4008afe9:0x3ffbaab0
43. 0x40081bae: panic_abort at /home/allan/esp32/esp-idf/components/esp_system/panic.c:469
44. 0x4008a471: esp_system_abort at /home/allan/esp32/esp-idf/components/esp_system/port/esp_system_chip.c:92
45. 0x40092795: __assert_func at /home/allan/esp32/esp-idf/components/newlib/assert.c:81
46. 0x400db513: u8g2_esp32_i2c_byte_cb at /home/allan/Codigos/EnervisionMegaDash/components/u8g2-hal-esp-idf/src/u8g2_esp32_hal.c:148 (discriminator 17)
47. 0x400db129: u8x8_cad_ssd13xx_fast_i2c at /home/allan/Codigos/EnervisionMegaDash/components/u8g2/csrc/u8x8_cad.c:592
48. 0x400db177: u8x8_d_helper_display_init at /home/allan/Codigos/EnervisionMegaDash/components/u8g2/csrc/u8x8_display.c:68
49. 0x400db321: u8x8_d_sh1106_128x64_noname at /home/allan/Codigos/EnervisionMegaDash/components/u8g2/csrc/u8x8_d_ssd1306_128x64_noname.c:487
50. 0x401661ed: u8x8_InitDisplay at /home/allan/Codigos/EnervisionMegaDash/components/u8g2/csrc/u8x8_display.c:137
51. 0x400d92e9: f_setupI2c at /home/allan/Codigos/EnervisionMegaDash/main/f_display.c:44
52. 0x400d8850: app_main at /home/allan/Codigos/EnervisionMegaDash/main/main.c:40
53. 0x4016d47b: main_task at /home/allan/esp32/esp-idf/components/freertos/app_startup.c:208
54. 0x4008afe9: vPortTaskWrapper at /home/allan/esp32/esp-idf/components/freertos/FreeRTOS-Kernel/portable/xtensa/port.c:134
55.  
56.  
57.  
58.  
59.  
60. ELF file SHA256: 757a52547
61.  
62. Rebooting...
63. ets Jul 29 2019 12:21:46
64.  
65. rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
66. configsip: 0, SPIWP:0xee
67. clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
68. mode:DIO, clock div:2
69. load:0x3fff0030,len:7172
70. load:0x40078000,len:15556
71. load:0x40080400,len:4
72. 0x40080400: _init at ??:?
73.  
74. ho 8 tail 4 room 4
75. load:0x40080404,len:3904
76. entry 0x40080640
77. I (31) boot: ESP-IDF v5.3-dev-1922-g5454d37d49 2nd stage bootloader
78. I (31) boot: compile time Apr  6 2024 17:06:50
79. I (33) boot: Multicore bootloader
80. I (37) boot: chip revision: v3.1
81. I (41) boot.esp32: SPI Speed      : 40MHz
82. I (45) boot.esp32: SPI Mode       : DIO
83. I (50) boot.esp32: SPI Flash Size : 4MB
84. I (54) boot: Enabling RNG early entropy source...
85. I (60) boot: Partition Table:
86. I (63) boot: ## Label            Usage          Type ST Offset   Length
87. I (71) boot:  0 nvs              WiFi data        01 02 00009000 00010000
88. I (78) boot:  1 phy_init         RF data          01 01 00019000 00010000
89. I (86) boot:  2 factory          factory app      00 00 00030000 00100000
90. I (93) boot:  3 storage          Unknown data     01 82 00130000 00100000
91. I (101) boot: End of partition table

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[liaifat85]

Here is a thread on this error message. You can check this out: https://esp32.com/viewtopic.php?t=10995

[MicroController]

Where am I going wrong?

Nowhere, apparently. That "esp32-hal" doesn't seem to support multiple displays; notably, it will attempt to install the I2C driver for each display again which fails on the second instance.
A hacky work-around could be to provide your own version of u8g2_esp32_i2c_byte_cb() for all but the first display which just returns 0 if msg==U8X8_MSG_BYTE_INIT, else calls the original u8g2_esp32_i2c_byte_cb().

[allacmc]

I solved, thanks:

Code: [Select all] [Expand/Collapse]

1.  
2. #include <u8g2.h>
3. #include "sdkconfig.h"
4. #include "u8g2_esp32_hal.h"
5.  
6. #define PIN_SDA 21
7. #define PIN_SCL 22
8.  
9. u8g2_t u8g2;
10. u8g2_t u8g2_1;
11. u8g2_t u8g2_2;
12. u8g2_t u8g2_3;
13. u8g2_t u8g2_4;
14.  
15. void f_setupDisplay() {
16.         selectChannel(0);
17.         u8g2_esp32_hal_t u8g2_esp32_hal = U8G2_ESP32_HAL_DEFAULT;
18.         u8g2_esp32_hal.bus.i2c.sda = PIN_SDA;
19.         u8g2_esp32_hal.bus.i2c.scl = PIN_SCL;
20.         u8g2_esp32_hal_init(u8g2_esp32_hal);
21.         for(int i=0;i<5;i++){
22.             selectChannel(i);
23.             u8g2_Setup_sh1106_i2c_128x64_noname_f(&u8g2, U8G2_R0,u8g2_esp32_i2c_byte_cb,u8g2_esp32_gpio_and_delay_cb);
24.             u8x8_SetI2CAddress(&u8g2.u8x8, 0x78);
25.             if(i==0){
26.                 u8g2_InitDisplay(&u8g2);
27.             }else{
28.                 u8g2_SetDisplayRotation(&u8g2, U8G2_R2);
29.             }
30.             u8g2_SetPowerSave(&u8g2, 0);
31.             u8g2_ClearBuffer(&u8g2);
32.             u8g2_SetFont(&u8g2, u8g2_font_ncenB12_tr);
33.             u8g2_DrawStr(&u8g2, 6, 40, "ENERVISION");
34.             u8g2_SendBuffer(&u8g2);
35.         }
36.         vTaskDelay(pdMS_TO_TICKS(2000));
37. }

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