Interfacing with Arduino I2C LCD

[norohs]

it should be moved to another section.

Feel free to move it.

[norohs]

'ARDUINO IIC LCD GY-LCD-V1
'PIC 12F629
'PRINTS " HELLO RCG!_"
Define OSC 20               
DEFINE I2C_SLOW 1           
CMCON = $7           
OPTION_REG.7 = 0
C VAR GPIO.1         
D VAR GPIO.0
ADDR VAR BYTE           
ADDR = $40
CMD VAR BYTE
LCD_CMD VAR BYTE            
E VAR LCD_CMD.BIT4    
RS VAR LCD_CMD.BIT6
E=0:RS=0
LCD_CMD = 0
PAUSE 1000                  
LCD_CMD = $2 
GOSUB LCDWRITE     
GOSUB LCDWRITE       
LCD_CMD = $8  
GOSUB LCDWRITE       
LCD_CMD = $0  
GOSUB LCDWRITE
LCD_CMD = $E
GOSUB LCDWRITE       
LCD_CMD = $0  
GOSUB LCDWRITE
LCD_CMD = $6
GOSUB LCDWRITE       
RS=1  
LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $48
GOSUB LCDWRITE
LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $45
GOSUB LCDWRITE
LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $4C
GOSUB LCDWRITE
LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $4C
GOSUB LCDWRITE
LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $4F
GOSUB LCDWRITE
LCD_CMD = $42   
GOSUB LCDWRITE
LCD_CMD = $40
GOSUB LCDWRITE
LCD_CMD = $45   
GOSUB LCDWRITE
LCD_CMD = $42
GOSUB LCDWRITE
LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $43
GOSUB LCDWRITE
LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $47
GOSUB LCDWRITE
LCD_CMD = $42   
GOSUB LCDWRITE
LCD_CMD = $41
GOSUB LCDWRITE
RETURN
LCDWRITE:
I2CWRITE D,C,ADDR,[LCD_CMD]
E=1
I2CWRITE D,C,ADDR,[LCD_CMD]
E=0
I2CWRITE D,C,ADDR,[LCD_CMD]
RETURN
END

[EarlyBird2]

Has anyone done this?

I have downloaded the Aduino LCD libraries and there are differences between them and the above code.

[Demon]

Just curious where RETURN right before LCDWRITE subroutine returns to?

Don't have one to test.

Robert

[EarlyBird2]

Just curious where RETURN right before LCDWRITE subroutine returns to?

Don't have one to test.

Robert

From what I have read the code is correct in that it will print to the LCD on a one shot basis then return to nowhere.

Return to nowhere?

Does anyone have one to test?

Having used serial LCDs which were easy to use by sending ascii commands and data using serout2 these look very difficult. I just wonder why make something difficult when there is an easier way.

I have done more research and I believe that all Arduino I2C LCDs are not the same. I guess it depends on the manufacturers implementation and the chips used on the backpack.

[Demon]

So I'm not missing a label then, the code just isn't terminated "properly".

I kept going through it thinking I was missing something obvious.

Robert

[EarlyBird2]

I kept going through it thinking I was missing something obvious.
Robert

Not that I can see but then I always wonder if I am missing something whether it is obvious or not.

LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $48
GOSUB LCDWRITE
LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $45
GOSUB LCDWRITE
LCD_CMD = $44   
GOSUB LCDWRITE
LCD_CMD = $4C
GOSUB LCDWRITE

I have been trying to work out what the $44 do because they are not printed on the screen.