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Hi to everybody,
I use a serial LCD Devantech 4 xes 20 one wire connected to the usual pic.
When it begins working strange things to the characters happen: they appear of of it new, they skip in low they disappear then then aloft, it returns normal for a certain time, it illuminates him jerky when he is not programmed to light up.. What can the cause be?
thanks
chip_select
Not following your english very well.
Could you give a shot at rephrasing this a bit?
Quote:
they appear of of it new, they skip in low they disappear then then aloft, it returns normal for a certain time, it illuminates him jerky when he is not programmed to light up.
the display involves in strange way. it is unstable. characters that disappear or that are replaced. example:
'my code :
include "modedefs.bas"
loop:
serout portb.0,2,[" Good morning"]
serout portb.0,2,[12,1] 'clear display
goto loop
'the display
second: 1 2 3
Good moxxx g āoox morǼinx 17od morninx and so on..
Are you using the internal oscillator on the PIC? Might not be as stable as you think...
Also, try adding some CHAR_PACING (it's in the manual)...at 9600 baud, 5ms should be more than enough to keep a serial LCD happy.
Past that, try bumping down to 2400 baud and see what happens...
Why are you writing to it, and then in the next line of code, clearing the screen? .... Then looping through the same sequence???
Is this the display you are using?
http://www.robot-electronics.co.uk/htm/Lcd02tech.htm
THX SKIMASK,
I have added : "define char_pacing 5 "
Now it works fine.
chip_select
So there is a baud rate speed mismatch between the PIC and the LCD. What oscillator speed/config are you using?
Or INTOSC or Crystal 4Mhz whit 2 capacitor 22pF.
Or INTOSC or Crystal 4Mhz whit 2 capacitor 22pF.
T9600 baud
What chip?
Can you post your whole code?
And post how your fuses are set. Either from the *.inc or in code or if you are using one of those programs that does it for you.