Strange LCD problem with PIC16F876A
Today I started to build a project with a variant of PIC I never used before, 16F876A, but since its the little brother of my old fauvorite pic 16F877A I didnt think it would be any problems..
HOWEVER..
I got LCD-problems, and they are so strange. ..To boil it down I wrote a short test program..
Code:
@ DEVICE PIC16F876A,HS_OSC,LVP_OFF,WDT_OFF,PROTECT_OFF
DEFINE OSC 20 ' Lets work at 20 MHz
' DEFINE LCD_DREG PORTA ' Set LCD Data port
' DEFINE LCD_DBIT 0 ' Set starting Data bit (0 or 4) if 4-bit bus
' DEFINE LCD_RSREG PORTA ' Set LCD Register Select port
' DEFINE LCD_RSBIT 4 ' Set LCD Register Select bit
' DEFINE LCD_EREG PORTB ' Set LCD Enable port
' DEFINE LCD_EBIT 3 ' Set LCD Enable bit
' DEFINE LCD_BITS 4 ' Set LCD bus size (4 or 8 bits)
' DEFINE LCD_LINES 2 ' Set number of lines on LCD
' DEFINE LCD_COMMANDUS 1500 ' Set command delay time in us
' DEFINE LCD_DATAUS 44 ' Set data delay time in us
pause 2000 ' Gracetime for the LCD
Main:
toggle PORTB.5
LCDOUT $FE, 1, "Hello"
LCDOUT $FE, $C0, "World"
pause 2000
LCDOUT $FE, 1, "1234567890123456"
pause 500
LCDOUT $FE, 1, "ABCDEFGHIJKLMNOP"
pause 500
LCDOUT $FE, 1, "abcdefghijklmnop"
pause 500
goto main:
End
..The result is:
First the display says
Hello
World
..Waits 2 seconds and then
34567890123456
waits .5 sec
CDEFGHIJKLMNOP
waits .5 sec
cdefghijklmnop
waits .5 sec
llo
World
..and then continue..
Why is it eating the two leading chars ? ..I tried the display on another breadboard with an
16F877A, works perfectly fine..
I tried to add all defines, and tweak some values (currently commented out in the code), no difference.
Any ideas ?
