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LCD data refresh !!

 
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mindstorm88



Joined: 06 Dec 2006
Posts: 102
Location: Montreal , Canada

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LCD data refresh !!
PostPosted: Wed Mar 03, 2010 6:41 pm     Reply with quote
Hi Guys, just want to know if you have a special trick for it !!!

I have a 2x16 display. I put data in the 4 corners (easy). Now the small problem (about the same for all corners), lets say bottom left hand corner, the data is a voltage that start 0.0V to 999.9V. I'm using the following code:
Code:

lcd_gotoxy(1,2);
printf(lcd_putc, "%3.1wV",volt);

The problem with it is when voltage goes up, it is ok data shift to the right, but then when it goes down I have some character left on screen, to get rid of it should I clear the display every time (I tried but I don't like the flickering it creates) ???

Any solutions ??
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Mar 03, 2010 7:31 pm     Reply with quote
You can tell printf to pad the number with leading spaces
by increasing the field width to 5. So in the first case
below, with 2.1, it will have two leading spaces. In the
2nd case, there won't be any. In each case the overall
displayed width will be 5 (including the decimal point).
Code:

#include <18F452.h>
#fuses XT,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//======================================
void main(void)
{
int16 volts;

volts = 21;
printf("%5.1wV\r",volts);

volts = 1245;
printf("%5.1wV\r",volts);

while(1);
}
mindstorm88



Joined: 06 Dec 2006
Posts: 102
Location: Montreal , Canada

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PostPosted: Thu Mar 04, 2010 6:49 am     Reply with quote
Too easy and it was just in front of my eyes !!! Embarassed Very Happy

Thanks PCM you've just simplified my life, it works great, as usual YOU'RE THE MAN !!!

I love this forum !!!! Smile
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