EasyPic 6 Mikroelectronika

[Stargazer3141]

Does anyone have any experience with this development system using PBP? I am a newbie, and I am trying to use a Pic16F628A to write to the on board LCD screen. It appears to be connected to port B - can't seem to get it to work. Can anyone send a simple sample program that might work?
Thank you for any help.

[richard]

i have an ep7board it appears to be very similar to a ep6 schematically for the lcd connections. i have experienced no trouble with the lcd. only issue i have using those old style chips is getting the programmer to verify chip. iirc the pgm pin needs to pulled down for success.

you provide no detail and can't get it to work is pretty vague.
what have you tried ? and what happens ?

[Stargazer3141]

It appears that the LCD is connected to Port B. I think by default the PIC 16F628A uses Port A. I just do not know how to tell the PIC to use Port B. What PIC are you using with Easypic 7? I was hoping someone could send me the pic basic code that would provide me with a simple test.

[Stargazer3141]

my code looks like this:

CMCON = 7
DEFINE LCD_DREG PORTB
DEFINE LED_DBIT 0
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 4
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 5
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2



PAUSE 1000
LCDOUT $FE,1
LCDOUT "HELLO"
PAUSE 1000

END

[Stargazer3141]

oops - correcting a typo and an omission - this is the code that I am trying

TRISB=0
CMCON = 7
DEFINE LCD_DREG PORTB
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 4
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 5
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2



PAUSE 1000
LCDOUT $FE,1
LCDOUT "HELLO"
PAUSE 1000

END




Thank you for any help

[richard]

i don't see why that will not work , assuming the pic config you have omitted showing is correct

can you blink a led ?


this works fine for a 648a , a 628a's rich brother

'****************************************************************'*  Name    : LCD_TEST.BAS                                      *
'*  Author  : RICHARD                                           *
'*  Date    : 4/8/2017                                          *
'*  Version : 1.0                                               *
'*  Notes   : pic16f648a    ep7                                 *
'*          :  2016 LCD                                         *
'****************************************************************
#CONFIG
  __config  _INTOSC_OSC_NOCLKOUT & _WDT_ON & _PWRTE_OFF & _MCLRE_ON & _BODEN_ON & _LVP_OFF & _DATA_CP_OFF & _CP_OFF
#ENDCONFIG
    
DEFINE OSC 4 


'LCD defines begin here   
    DEFINE LCD_BITS 4 	'defines the number of data interface lines (4 or 8) 
    DEFINE LCD_DREG PORTB	'defines the port where data lines are connected to
    DEFINE LCD_DBIT 0 	'defines the position of data lines for 4-bit interface (0 or 4)
    DEFINE LCD_RSREG PORTB	'defines the port where RS line is connected to
    DEFINE LCD_RSBIT 4 	'defines the pin where RS line is connected to 
    DEFINE LCD_EREG PORTB 	'defines the port where E line is connected to 
    DEFINE LCD_EBIT 5 	'defines the pin where E line is connected 
    DEFINE LCD_COMMANDUS 1500 	'defines the delay after LCDOUT statement 
    DEFINE LCD_DATAUS 50 		'delay in micro seconds
'END of LCD DEFINES       
    
    Pause 500       ' LCD initialize time
    lcdout $FE,1 
    LCDOUT $fe,$83,"HELLO"
    LCDOUT $fe,$c8,"World"
    stop
end

ps  rb4 must be pulled low if using ep7 on board programmer or else pgm load will never verify

[Sherbrook]

Hi stargazer

I think you have the defines for the LCD wrong. Have a look at the schematic in the user manual for the LCD. You will see that portb.0 to portb.3 is connected to the HIGH four data bits of the LCD.

Change
DEFINE LCD_DBIT 0
to
DEFINE LCD_DBIT 4

Check that the LCD has power (I think you have to set a switch or jumper). Your LCD should burst into life.

Phil

[Stargazer3141]

I am delighted to report success! Well, sort of. Richard - you started me thinking about a possible hardware issue so I started snooping around with my meter. On the LCD pins, I was seeing some very strange readings - pins shorted together, etc. I upgraded to an Easypic 7 and used your code, and it works like a charm. Not sure why my easy pic 6 was damaged - I barely used it - been sitting in a drawer. BTW with the easy pic 7 that was a great tip about pulling RB4 low - chip will not program unless it is held low ( not sure why?)

Thanks so much for taking the time to help me!

[richard]

not quite the solution i expected , still you're up and running