Breathing white again

Firmware
1

Could you help, what is wrong with this code?
It sometimes works fine, sometimes is stucking in breathing white

Why?

#include "application.h"

#define OLED_Address 0x3c
#define OLED_Command_Mode 0x80
#define OLED_Data_Mode 0x40

void setup()
{
  Wire.begin();


}

void sendData(unsigned char data)
{
    Wire.beginTransmission(OLED_Address);      // **** Start I2C
    Wire.write(OLED_Data_Mode);             // **** Set OLED Data mode
    Wire.write(data);
    Wire.endTransmission();                     // **** End I2C
}

void sendCommand(unsigned char command)
{
    Wire.beginTransmission(OLED_Address);      // **** Start I2C
    Wire.write(OLED_Command_Mode);              // **** Set OLED Command mode
    Wire.write(command);
    Wire.endTransmission();                      // **** End I2C
      delay(10);
}

void send_string(const char *String)
{
    unsigned char i=0;
    while(String[i])
    {
        sendData(String[i]);      // *** Show String to OLED
        i++;
    }
}
bool lcdActive = false;

void initLCD() {
 // *** I2C initial *** //
   delay(100);
   sendCommand(0x2A);    // **** Set "RE"=1    00101010B
   sendCommand(0x71);
   sendCommand(0x5C);
   sendCommand(0x28);

   sendCommand(0x08);    // **** Set Sleep Mode On
   sendCommand(0x2A);    // **** Set "RE"=1    00101010B
   sendCommand(0x79);    // **** Set "SD"=1    01111001B

   sendCommand(0xD5);
   sendCommand(0x70);
   sendCommand(0x78);    // **** Set "SD"=0

   sendCommand(0x08);    // **** Set 5-dot, 3 or 4 line(0x09), 1 or 2 line(0x08)

   sendCommand(0x06);    // **** Set Com31-->Com0  Seg0-->Seg99

   // **** Set OLED Characterization *** //
   sendCommand(0x2A);      // **** Set "RE"=1
   sendCommand(0x79);      // **** Set "SD"=1

   // **** CGROM/CGRAM Management *** //
   sendCommand(0x72);      // **** Set ROM
   sendCommand(0x00);      // **** Set ROM A and 8 CGRAM

   sendCommand(0xDA);     // **** Set Seg Pins HW Config
   sendCommand(0x10);

   sendCommand(0x81);      // **** Set Contrast
   sendCommand(0xFF);

   sendCommand(0xDB);      // **** Set VCOM deselect level
   sendCommand(0x30);      // **** VCC x 0.83

   sendCommand(0xDC);      // **** Set gpio - turn EN for 15V generator on.
   sendCommand(0x03);

   sendCommand(0x78);      // **** Exiting Set OLED Characterization
   sendCommand(0x28);
   sendCommand(0x2A);
   //sendCommand(0x05);     // **** Set Entry Mode
   sendCommand(0x06);     // **** Set Entry Mode
   sendCommand(0x08);
   sendCommand(0x28);     // **** Set "IS"=0 , "RE" =0 //28
   sendCommand(0x01);
   sendCommand(0x80);     // **** Set DDRAM Address to 0x80 (line 1 start)

   delay(100);
   sendCommand(0x0C);      // **** Turn on Display

}

void loop()
{

 if(!lcdActive) {
   initLCD();
   lcdActive = true;
 }

 // ********************************************************************//
 // **** Show Data Value *** //
 
 send_string("0123456789ABCDEF");
 sendCommand(0xC0);      // **** New Line
 send_string("Русский?");
 //sendCommand(0x01);    // **** Clear display


 // **** Show Data Value *** //
 // ********************************************************************//

}
2

@ryotsuke,

I have loaded your code to a core of mine and looking to see if there’s any issues.

Don’t have the device you are interfacing to so the results might differ.

Anyhow, did you try on a separate core? :wink:

3

@ryotsuke,

I have not seen any breathing white issue yet. Are you able to tell under what condition does it happen?

Also, does it work OK after a reset? :slight_smile:

4

I’ve tried different core and it works flawlessly
Meaning first one is faulty? It works sometimes

5

It might be some issue with the core so my advice would be to switch over to another core for your project :wink:

6

It looks like a voltage regulator heats up much more on faultly board. It gets pretty hot in like ~30 seconds from start

7

Mine is ok. Just touched it to be sure.

Hmm…There’s a couple of people who had this similar issue. Would be great if you can swap out the regulator and test again!

8

Yes, other core temperature is OK. I don’t have enough skills to replace regulator and don’t make ugly mess :smiley:
I’ve managed to do a firmware reset and ‘faulty’ works again. Still heavily heats up.

1 Like
9

I guess you should not continue to use it to prevent further damage… :wink:

Maybe you can email :spark: at hello@spark.io and see if they can do anything for you.

Have fun!

1 Like