ESP32 reboot loop in creat OLED display object

Projects Programming
1

Hi , everyone
When I create an OLED object, the program seems to be crushing :sob:. I am not sure if there is something wrong with the way I create the object. Could you please help me check it out? :shushing_face:

[my code]

#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

class MainView
{
private:
    Adafruit_SSD1306 myDisplay;

public:
    MainView() : myDisplay(128, 64, &Wire, -1){};
    void Show() { myDisplay.display(); };
};

MainView mainView;

void setup()
{
    Serial.begin(115200);
    mainView.Show();
}
void loop() {}

[platfomio.ini]

[env:nodemcu-32s]
platform = espressif32
board = nodemcu-32s
framework = arduino

monitor_speed = 115200
monitor_rts = 1
monitor_filters = esp32_exception_decoder

lib_deps = 
	adafruit/Adafruit SSD1306@^2.5.7
	adafruit/Adafruit GFX Library@^1.11.7

[error information]

ELF file SHA256: c1f939fb7d5dee0f

Rebooting...
ets Jun  8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0030,len:1184
load:0x40078000,len:13232
load:0x40080400,len:3028
entry 0x400805e4
[    26][E][Wire.cpp:381] setClock(): could not acquire lock
[    26][E][Wire.cpp:422] beginTransmission(): could not acquire lock
[    27][E][Wire.cpp:526] write(): NULL TX buffer pointer
[    32][E][Wire.cpp:526] write(): NULL TX buffer pointer
[    37][E][Wire.cpp:526] write(): NULL TX buffer pointer
[    42][E][Wire.cpp:526] write(): NULL TX buffer pointer
[    47][E][Wire.cpp:526] write(): NULL TX buffer pointer
[    52][E][Wire.cpp:526] write(): NULL TX buffer pointer
[    57][E][Wire.cpp:448] endTransmission(): NULL TX buffer pointer
[    63][E][Wire.cpp:422] beginTransmission(): could not acquire lock
[    70][E][Wire.cpp:526] write(): NULL TX buffer pointer
[    75][E][Wire.cpp:526] write(): NULL TX buffer pointer
[    80][E][Wire.cpp:448] endTransmission(): NULL TX buffer pointer
[    86][E][Wire.cpp:422] beginTransmission(): could not acquire lock
[    92][E][Wire.cpp:526] write(): NULL TX buffer pointer
Guru Meditation Error: Core  1 panic'ed (LoadProhibited). Exception was unhandled.

Core  1 register dump:
PC      : 0x400d1f22  PS      : 0x00060a30  A0      : 0x800d1575  A1      : 0x3ffc5340
A2      : 0x3ffc1c50  A3      : 0x000003ff  A4      : 0x00000000  A5      : 0x00000001  
A6      : 0x0000ffff  A7      : 0x0000007f  A8      : 0x800d1eef  A9      : 0x3ffc5310
A10     : 0x3ffc1ce8  A11     : 0x00000040  A12     : 0x00000000  A13     : 0x00000006  
A14     : 0x000000ff  A15     : 0x400d15a4  SAR     : 0x00000004  EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000  LBEG    : 0x4008655d  LEND    : 0x4008656d  LCOUNT  : 0xfffffffe  


Backtrace: 0x400d1f1f:0x3ffc5340 0x400d1572:0x3ffc5370 0x400d390e:0x3ffc53a0

  #0  0x400d1f1f:0x3ffc5340 in Adafruit_SSD1306::display() at .pio/libdeps/nodemcu-32s/Adafruit SSD1306/Adafruit_SSD1306.cpp:1022
  #1  0x400d1572:0x3ffc5370 in MainView::Show() at src/main.cpp:11
      (inlined by) setup() at src/main.cpp:19
  #2  0x400d390e:0x3ffc53a0 in loopTask(void*) at C:/Users/001/.platformio/packages/framework-arduinoespressif32/cores/esp32/main.cpp:42

thank you all

-edit-
:smile:
After reading DrDiettrich's answer, I looked at the OLED sample program again. After comparing it, I found that the 「begin」step was missing. After adding it, the program ran successfully.

#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

class MainView
{
private:
    Adafruit_SSD1306 myDisplay;

public:
    MainView() : myDisplay(128, 64, &Wire, -1){};
    void Begin() { myDisplay.begin(SSD1306_SWITCHCAPVCC, 0x3C); }; 
    void Show() { myDisplay.display(); };
};

MainView mainView;

void setup()
{
    Serial.begin(115200);
    mainView.Begin(); // Just missing this step，now program ran successfully.
    mainView.Show();
}
void loop() {}
2

Put that initialization out of the class into the setup() of an otherwise empty sketch.
Put a Serial.begin(115200) and Serial.println("Starting...)" before and Serial.println("Done"); after that call. If the second message is not sent then the display library is not usable with and ESP32. That was at least my problem with a similar Adafruit (SH1106) OLED library.

3

:blush:Thank you DrDiettrich.
With your reminder, I compared the OLED sample program again and found that it was missing
「begin」steps, now the program executes successfully.

4

Is it just an academic exercise of building class based codes or are there really advantages?

5

I tried to use arduino to practice OOP, and I have learned C#-related MVP and MVC architecture before, so I wanted to try to see if I can use it on arduino.

As for the advantages, I think if Arduino uses the UI part, then using the architecture will make the program easier to read and design. :slightly_smiling_face:

7

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