Displaying Custom Characters on 16*2 LCD

[pranathi]

Hello All,

 

I am using EADOGM 16*2 LCD display. I am stuck in displaying Custom characters. For example if I want to display a Battery symbol , i just take the equivalent values and write it to Display CGRAM. But when i try reading it back i get nothing on display.

 

Has anyone worked on this??

 

 

Here is my small peice of code for Writing to CGRAM

 

void BuildChar(uint8_t CGRAMloc, uint8_t *Data)
{
 uint8_t i;
 if(CGRAMloc<
 {
    DisplayWriteCmd(DISPLAY_CG_RAM_ADDRESS+(CGRAMloc*);
    for(i=0;i<8;i++)
       DisplayWriteData(Data[ i ]);
 }
}

 

It would be of great help if anyone could let me know what is the correct way of reading from CGRAM and displaying it on LCD

 

 

Thanks

pranathi

[AJISH ALFRED]

Hope this link helps you.

engineersgarage.com/embedded/avr-microcontroller-projects/lcd-interface-atmega16-circuit

[pranathi]

Thanks for the reply.

 

I did the follow the same as givne in the link.

But i couldnt get anything on the disaply.

 

void BuildCustom(uint8_t ucCGRAMloc, uint8_t *ucpData)
{
 uint8_t i;
 if(ucCGRAMloc<
 {
    WriteCmd((DISPLAY_CG_RAM_ADDRESS+ucCGRAMloc*);
    for(i=0;i<8;i++)
       WriteData(ucpData[ i ]);
 }
}

 

 

 

 

void WriteCustomChar(void)
{ BuildCustomChar(0x01,ucArrow);
 WriteCmd(0x64);
 WriteString(ucBatteryFull); 
 SetPos(0,0);
 WriteData(0);  // Location of LCD where the character is to be displayed 
 Delay(10);

}

 

 

here is my code. Please guide me where am i going wrong

[umar farrok]

better you try this  for eg :  ‘h’  in 16×2 

cmdwrt(0x64);

datwrt(16);

datwrt(16);

datwrt(16);

datwrt(16+8+4);

 etc like that

finally after assigned for h character mention where you want to display this

cmdwrt(0x80);

[Author]

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