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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Question about glcd_text57 routine |
 Posted: Fri Nov 23, 2007 1:23 pm |
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I want do the following, but this did't work, why???
| Code: |
char info_text[];
glcd_text57(20,25,sprintf(info_text,"%04.3fv %4LU Value",volts,adc_value),2,ON) |
The following works.
Is there a method to get it to work??
| Code: | sprintf(info_text,"%04.3fv %4LU Value",volts,adc_value);
glcd_text57(20,25,info_text,2,ON);
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Nov 23, 2007 1:34 pm |
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Look at the function definition for glcd_text57() in the GLCD.c file.
What does it expect as the 3rd parameter ?
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void glcd_text57(int x, int y, char* textptr, int size, int1 color)
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Look at the function definition for sprintf() in the CCS manual.
What does it return ?
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SPRINTF( )
Syntax: sprintf(string, cstring, values...);
Parameters: string is an array of characters.
cstring is a constant string or an array of characters null terminated.
Values are a list of variables separated by commas.
Returns: Nothing |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Fri Nov 23, 2007 2:30 pm |
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Ok, thats is clear.
Is there another way to do that? (return a string to glcd_text57)
Like the charaterlcd method with lcd_putc or so? |
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Dimlow
Guest
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| Posted: Sat Nov 24, 2007 3:22 am |
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Yes, there is another way . i redirect the output of printf with your own putc routine. here is the code i use.
| Code: |
#ifndef GLCD_PUTC_FOR_PRINTF
#define GLCD_PUTC_FOR_PRINTF
#define GLCD_PUTC_LCD_WIDTH 128
#define GLCD_PUTC_LCD_HEIGHT 64
#define GLCD_PUTC_CHARWIDTH 5+1
#define GLCD_PUTC_CHARHEIGHT 7+1
int glcd_putc_x=0,glcd_putc_y=0;
char glcd_putc_text[2]=" ";
void glcd_putc (char c)
{
switch(c)
{
case '\n' : {
glcd_putc_x=0;
glcd_putc_y+=GLCD_PUTC_CHARHEIGHT;
break;
}
default : {
*glcd_putc_text=c;
glcd_text57(glcd_putc_x,glcd_putc_y,glcd_putc_text,1,1);
glcd_putc_x+=GLCD_PUTC_CHARWIDTH;
break;
}
}
if(glcd_putc_x>=GLCD_PUTC_LCD_WIDTH-GLCD_PUTC_CHARWIDTH) {glcd_putc_x=0;glcd_putc_y+=GLCD_PUTC_CHARHEIGHT;}
if(glcd_putc_y>=GLCD_PUTC_LCD_HEIGHT) glcd_putc_y=0;
}
#endif |
use it like this
| Code: | printf(glcd_putc,"Hello World");
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it does not handle many control character, you will have to code that yourself
Hope that helps
Gary[/code] |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Sat Nov 24, 2007 3:29 am |
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Ok, thanks i will try
The glcd_text57 did not clear unused pixels
Then you must always clear area when updated value comes,
this gives flickering
Is it possible to change the glcd_text57 routine to do that
maybe someone has already change it
| Code: | void main() {
long int adc_value;
float volts;
char text[];
setup_adc_ports(AN0|VSS_VDD);
setup_adc(ADC_CLOCK_INTERNAL|ADC_TAD_MUL_20);
set_adc_channel(0);
glcd_init(ON);
sprintf(text,"PIC18 10-bits ADC Sampling Ch AN0:");
glcd_text57(5,10,text,1,ON);
while(TRUE) {
delay_ms(1000);
adc_value=read_adc();
volts=(float)(adc_value*5)/1023.0;
sprintf(text,"%04.3fv %4LU Value",volts,adc_value);
glcd_text57(5,50,text,2,ON);
}
} |
The code sprintf(text,"%04.3fv %4LU Value",volts,adc_value) overwrite only the new values (volts and adv_value) and is unreadeble
Is there an solution? |
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Dimlow
Guest
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| Posted: Sat Nov 24, 2007 3:39 am |
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Well i wrote that routine last week so i don't think anyone has already done it with my code. But I'm sure if you work hard enough at it you can do it.
If you get stuck i will help out. As I'm sure i will useone day.
Gary |
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Dimlow
Guest
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| Posted: Sat Nov 24, 2007 3:43 am |
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what you will have to do is store that old values, then when you come to print the new one , erase the old value with glcd_text57(5,50,text,2,OFF); then print the new values, etc.
Gary |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Sat Nov 24, 2007 4:00 am |
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I change it to this
| Code: | delay_ms(1000);
adc_value=read_adc();
volts=(float)(adc_value*5)/1023.0;
sprintf(text,"%04.3fv %4LU Value",volts,adc_value);
glcd_text57(5,50,text,2,OFF);
delay_ms(1);
glcd_text57(5,50,text,2,ON); |
But this overwrite the new values |
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Dimlow
Joined: 24 Nov 2007
Posts: 9
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| Posted: Sat Nov 24, 2007 4:13 am |
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try something like this
| Code: |
adc_value=read_adc();
volts=(float)(adc_value*5)/1023.0;
sprintf(text,"%04.3fv %4LU Value",old_volts,old_adc_value);
glcd_text57(5,50,text,2,OFF);
sprintf(text,"%04.3fv %4LU Value",volts,adc_value);
glcd_text57(5,50,text,2,ON);
old_volts=volts;old_adc_value=adc_value;
delay_ms(100);
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Gary |
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The Puma
Joined: 23 Apr 2004
Posts: 227
Location: The Netherlands
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| Posted: Sat Nov 24, 2007 6:24 am |
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This works
| Code: |
delay_ms(1000);
glcd_text57(5,50,text,2,OFF);
adc_value=read_adc();
volts=(float)(adc_value*5)/1023.0;
sprintf(text,"%04.3fv %4LU Value",volts,adc_value);
glcd_text57(5,50,text,2,ON);
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Dimlow
Joined: 24 Nov 2007
Posts: 9
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| Posted: Sat Nov 24, 2007 7:05 am |
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Yep will do, i was assuming you would reuse the text variable for other texts.
Gary |
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MegatroniC
Joined: 08 Dec 2009
Posts: 35
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| Posted: Thu Mar 15, 2012 8:40 am |
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Hello
excuse me, that lift so old topic ...
My test code, pic18f4620 and TG12864D0 (KS0108):
| Code: | void main() {
long int adc_value, old_adc_value;
float volts;
char text[20];
char time[9];
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_INTERNAL|ADC_TAD_MUL_16);
set_adc_channel(0);
porta=0;
trisa=0x3F;
glcd_init(ON);
delay_ms(200);
sprintf(text,"Voltage: ACD:");
glcd_text57(0,10,text,1,ON);
sprintf(text,"Time is:");
glcd_text57(0,30,text,1,ON);
while(TRUE) {
adc_value=read_adc();
volts=(float)(adc_value*5)/1023.0;
if(adc_value != old_adc_value){
old_adc_value=adc_value;
glcd_text57(0,20,text,1,OFF);
sprintf(text,"%04.3fv %4LU units",volts,adc_value);
glcd_text57(0,20,text,1,ON);
}
ds1307_get_time(hrs,min,sec);
if(sec != old_sec){
old_sec=sec;
glcd_text57(0,40,time,1,OFF);
sprintf(time,"%02d:%02d:%02d" hrs,min,sec);
glcd_text57(0,40,time,1,ON);
}
}
} |
When change the time value does not flicker, this code works perfectly.
But when changing the voltage, value on the display flickers.
How to prevent this flickering? |
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