I2C LCD

[DaveC3]

If you saw something on the display we are getting close. When you get a chance post the code where you saw "ell o Hello "

Here is an initialization for a 5v display data sheet simular to yours.

INITIALIZE: (5V)
MOV I2C_CONTROL,#00H ;WRITE COMMAND
MOV I2C_DATA,#38H ;Function Set
LCALL WRITE_CODE
MOV I2C_CONTROL,#00H ;WRITE COMMAND
MOV I2C_DATA,#39H ;Function Set
LCALL WRITE_CODE
MOV I2C_DATA,#14H ;Internal OSC frequency
LCALL WRITE_CODE
MOV I2C_DATA,#79H ;Contrast set
LCALL WRITE_CODE
MOV I2C_DATA,#50H ;Power/ICON control/Contrast set
LCALL WRITE_CODE
MOV I2C_DATA,#6CH ;Follower control
LCALL WRITE_CODE
MOV I2C_DATA,#0CH ;Display ON/OFF
LCALL WRITE_CODE
MOV I2C_DATA,#01H ;Clear Display
LCALL WRITE_CODE

Based on this information try to change your code to

ST7036Init:


 


I2CWRITE PORTC.1, PORTC.0,$78,[$00,$38]
PAUSE 10 
I2CWRITE PORTC.1, PORTC.0,$78,[$00, $39,$14,$79,$50,$6C,$0C,$01,$06] ' 



Return

[midali]

If you saw something on the display we are getting close. When you get a chance post the code where you saw "ell o Hello "

Here is an initialization for a 5v display data sheet simular to yours.

INITIALIZE: (5V)
MOV I2C_CONTROL,#00H ;WRITE COMMAND
MOV I2C_DATA,#38H ;Function Set
LCALL WRITE_CODE
MOV I2C_CONTROL,#00H ;WRITE COMMAND
MOV I2C_DATA,#39H ;Function Set
LCALL WRITE_CODE
MOV I2C_DATA,#14H ;Internal OSC frequency
LCALL WRITE_CODE
MOV I2C_DATA,#79H ;Contrast set
LCALL WRITE_CODE
MOV I2C_DATA,#50H ;Power/ICON control/Contrast set
LCALL WRITE_CODE
MOV I2C_DATA,#6CH ;Follower control
LCALL WRITE_CODE
MOV I2C_DATA,#0CH ;Display ON/OFF
LCALL WRITE_CODE
MOV I2C_DATA,#01H ;Clear Display
LCALL WRITE_CODE

Based on this information try to change your code to

ST7036Init:


 


I2CWRITE PORTC.1, PORTC.0,$78,[$00,$38]
PAUSE 10 
I2CWRITE PORTC.1, PORTC.0,$78,[$00, $39,$14,$79,$50,$6C,$0C,$01,$06] ' 



Return

I tried ...
if I write the PIC and turn ON the board with Vcc = 3,6V I see on LCD this:

...then I move the Vcc to 5V, on LCD appear :

In this case I can set a contrast from 5k potentiometer on V0 LCD pin, but I see only full dots.

If I write the PIC and turn ON the board with Vcc = 5v, I see nothing on LCD. No effect if I down the voltage to 3,6V !