LCD Text Display

Mbed OS
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1

Hi here i used I2C using LCD Display(Nucleo-F746ZG) the Display unit Details LCD RG1602A and I2C IC - PCF8574T, i was taken from header file is this link-TextLCD/README.md at main · mbed-ce-libraries-examples/TextLCD · GitHub.

below i have attached my code

//-------------------------------------Display Unit for Bottling------------------------------------------------------------------------------

DigitalOut led(PF_7);

I2C i2cBus(PB_9,PB_8);

TextLCD_I2C lcd(&i2cBus, PCF8574A_SA7, TextLCD::LCD16x2);//

int main() {

  pc.baud(115200);
  wait_ms(10);
  Ard.baud(115200);
  pc.printf("enter the main");
  int Ch, Speed, Steps, Dir, Time, Solidflap_Servo_closeee, Micro_Servo_Up,Down, User_Weight, Value;
  float temp;
  while (1) {
    pc.printf("\n\n Select The case :");
    scanf("%d", &Ch);
    switch (Ch) {

case 27:{
    printf("MbedCE_lib_example_TextLCD\r\n");
    lcd.cls();
    lcd.setMode(TextLCD::DispOn); //DispOff, DispOn
    lcd.setBacklight(TextLCD::LightOff);//LightOff, LightOn
   lcd.setCursor(TextLCD::CurOff_BlkOff);
   lcd.printf("Welcome to\nBottling Setup\n");
    while(1) {
        led = !led;
        wait_ms(3000);  
        printf("\n inside while loop");   
        lcd.printf("Welcome to\nBottling Setup\n");                 
    }
}break;
}}}

its show like this one printing not happening

IMG20240527195745
IMG202405271957451920×2560 362 KB

2

Hello,

this state usually mean

  • wrongly set contrast of display
  • no communication that could be caused by wrong I2C address
  • no communication that could be caused by crossed wires (because this is not like UART)
  • or combination of errors above

BR, Jan