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kel
Joined: 17 Oct 2005
Posts: 68
Location: Brisbane
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| Bug in Printf() function!! |
 Posted: Thu Feb 09, 2006 12:59 am |
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Can you believe this, the following functions gives wierd results with printf() function
| Code: | void ADC_RESULT(void){
//static char cnt;
static int32 avgsum;
static int16 adcval;
static int8 tim_12_hr;
struct time local_clock;
memcpy(&local_clock,&GLOB_clock, sizeof(struct time));
avgsum+=local_clock.ADC_Results;
adcval=avgsum/8; //Average value- using/8 since in binary, this is quicker
avgsum-=adcval;
//Displaying time here
if((local_clock.hrs)>=13) tim_12_hr=(local_clock.hrs)-12;
else tim_12_hr=local_clock.hrs;
lcd_gotoxy(4, 1); //lcd_putc("LCD Ready...");
printf(LCD_PUTC,"%02d:%02d:%02d\n",tim_12_hr,local_clock.mins,local_clock.secs);
lcd_gotoxy(12, 1);
if(local_clock.hrs>11) lcd_putc("PM");
else lcd_putc("AM");
//local_clock. ADC_Results=(local_clock.val/=10);
lcd_gotoxy(4,2);
local_clock.Temp_deg = ((adcval - 559L)/2); //Temp_Kelvin = (Temp_degrees + 273.15); Temp_Kelvin =((((float)val*5)/1024)-273.15);
printf(LCD_PUTC," %2ld %2.1f\n\r",adcval,local_clock.Temp_deg);
//printf(LCD_PUTC," %2u %2.1f\n\r",local_clock.ADC_Results,local_clock.Temp_deg);
} |
this one gives two dotes i,.e. | Code: | | temperature =20.05.0 |
from:
| Code: | | printf(LCD_PUTC," %2ld %2.1f\n\r",adcval,local_clock.Temp_deg); |
| Code: | | The results are :local_clock.Temp_deg=20.07.0 |
instead of
please help me debug printf()
cheers... |
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kel
Joined: 17 Oct 2005
Posts: 68
Location: Brisbane
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| Did anyone meets this problem before? |
| Posted: Thu Feb 09, 2006 1:52 am |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Feb 09, 2006 2:01 am |
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You didn't post a test program. What you posted is really just a
code fragment. You're referencing a structure but you didn't
post the declaration. There's no way to drop this program into
MPLAB and compile it. You didn't post your compiler version,
so who knows what version or what PIC you're using. Most of
the code that you did post is irrelevent to the problem.
So in a nutshell, I took a look at it and bailed.
Just letting you know why you don't get a prompt answer sometimes. |
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Ttelmah
Guest
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| Posted: Thu Feb 09, 2006 5:21 am |
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He has posted the same question into another thread. It is not a bug in printf. There is nothing to clear away old results, so he is getting the new single digit result overwriting another longer result that was already there...
Best Wishes |
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kel
Joined: 17 Oct 2005
Posts: 68
Location: Brisbane
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| printf printing leaving garbadge |
| Posted: Thu Feb 09, 2006 8:17 pm |
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Thanks alot Ttelmah & PCM programmer.I'm sorry i did not include the code and my version.I'm using ccs vs:3.24.Here is the code.Ttelmah has help me sped it up a lil bit though it still count up.
Ttelmah & PCM Programmer could u please help me fixed the garbadge problem i.e. the printing decimal like from the following code.
| Code: | #include <16f877a.h>
#device *=16
#device adc=10
#fuse HS,NOWDT,NOPROTECT,NOLVP,NOPUT
#use dleay(clock=20000000)
#include <lcd_driver.c>
struct time {
int8 hrs;
int8 mins;
int8 secs;
int16 mSec;
int16 adcvalz;
float Temp_deg;
}GLOB_clock={15,58,45,0,0,0,0};
void ADC_RESULT(void);
#int_TBE
TBE_isr()
{
}
#int_RDA
RDA_isr()
{
}
#int_TIMER0
TIMER0_isr()
{
static int16 tick=0;
static int1 toggle=0;
//set_timer0(96);
tick+=256; // set_timer0(206); 20 mhz clock, no prescaler, set timer 0 to overflow in 35us
// 256-(.001024/(4*256/20000000))
if(toggle) {
toggle=0;
GLOB_clock.adcvalz=read_adc(ADC_READ_ONLY);
}
else {
toggle=1;
read_adc(ADC_START_ONLY);
}
if(tick>3125) { //2500){
tick-=3125;
if(++GLOB_clock.mSec>=25) { //1000){
GLOB_clock.mSec-=25; //1000;
if(++GLOB_clock.secs>=60) {
GLOB_clock.secs=0;
if(++GLOB_clock.mins>=60) {
GLOB_clock.mins=0;
if(++GLOB_clock.hrs>=24) {
GLOB_clock.hrs=0;
}
}
}
}
}
}
void main()
{
//char cnt;
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_DIV_32); //ADC_CLOCK_INTERNAL//SET adc conversion clock speed
//TAD(per bit)=1/20Mhz X 32 = 0.16us ;Requires min. 12 TAD for 10 bit
//Min. conversion time approx. 2us
set_adc_channel(0); //Set ADC channel to port0(pin 2,AN0).
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_64);
// setup_psp(PSP_DISABLED);setup_spi(FALSE);setup_timer_1(T1_DISABLED);setup_timer_2(T2_DISABLED,0,1);
// setup_comparator(NC_NC_NC_NC);setup_vref(FALSE);enable_interrupts(INT_AD);/ enable_interrupts(INT_TBE);enable_interrupts(INT_RDA);
lcd_init();
enable_interrupts(INT_TIMER0);
enable_interrupts(GLOBAL); //printf("Sampling adc"
lcd_gotoxy(2,1);
lcd_putc("\fSampling....");
delay_ms(1000);
lcd_putc("\f");
while(1)
{
ADC_RESULT();
delay_ms(200);
}
}
void ADC_RESULT(void){
static int1 first=true;
static int32 avgsum;
static int16 adcval;
static int8 tim_12_hr;
struct time local_clock;
memcpy(&local_clock,&GLOB_clock, sizeof(struct time));
if(first)
{
firts=false;
avgsum=local_clock.adcvalz*8;
}
else
{
avgsum+=local_clock.adcvalz;
adcval=avgsum/8; //Average value- using/8 since in binary, this is quicker
avgsum-=adcval;
}
local_clock.Temp_deg = ((adcval - 559L)/2); //Temp_Kelvin = (Temp_degrees + 273.15); Temp_Kelvin =((((float)val*5)/1024)-273.15);
//Displaying time here
if((local_clock.hrs)>=13) tim_12_hr=(local_clock.hrs)-12;
else tim_12_hr=local_clock.hrs;
lcd_gotoxy(4, 1); //lcd_putc("LCD Ready...");
printf(LCD_PUTC,"%02d:%02d:%02d\n",tim_12_hr,local_clock.mins,local_clock.secs);
lcd_gotoxy(12, 1);
if(local_clock.hrs>11) lcd_putc("PM");
else lcd_putc("AM");
//local_clock. ADC_Results=(local_clock.val/=10);
lcd_gotoxy(4,2);
printf(LCD_PUTC," %2ld %2.1f\n\r",adcval,local_clock.Temp_deg);
//printf(LCD_PUTC," %2u %2.1f\n\r",local_clock.ADC_Results,local_clock.Temp_deg);
} |
guys i will appreciate your help... 
| Code: | | lastly how do i put a degree symbol(oC) on the LCD?Any idea? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Feb 09, 2006 10:03 pm |
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| Quote: | | could u please help me fixed the garbadge problem i.e. the printing decimal like |
Ttelmah told you exactly what to do:
| Quote: |
You need to either clear the screen, use a fixed width numeric
output, or have the value written with a few trailing zeros,
to get rid of the remaining data on the display. |
If you don't know how to clear the screen (the LCD), then read
the LCD.C file, which is in c:\Program Files\Picc\Drivers, and
notice the command that is used to clear the LCD screen.
(The command is listed right at the start of the file.)
Then put it into your own program.
The purpose of this forum is not to do your school work for you.
We'll help you, but you must do some of the work yourself. |
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kel
Joined: 17 Oct 2005
Posts: 68
Location: Brisbane
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| Display flickering!! |
| Posted: Thu Feb 09, 2006 10:41 pm |
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Thanks for your advice...I appreciate..
It's not that i donnot know how to clear the screen but that it flickers the screen wshen it's include in the loop...
here is what i have done.
What then can i do to stop the flickering of the Display? |
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newguy
Joined: 24 Jun 2004
Posts: 1903
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| Re: Display flickering!! |
| Posted: Thu Feb 09, 2006 10:50 pm |
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| kel wrote: | | What then can i do to stop the flickering of the Display? |
The obvious answer is to slow the whole thing down. Also add a check to your print routine. Only print a temperature if it is different from that already shown. |
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kel
Joined: 17 Oct 2005
Posts: 68
Location: Brisbane
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| Adding check does not print anything |
| Posted: Thu Feb 09, 2006 11:35 pm |
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The following is code i added to check for any new values but for some rerasons does seem to print nothing.Slowing down work fine.What is the problem with the code below.
[code]void ADC_RESULT(void){
static int1 first=true;
static int32 avgsum;
static int16 adcval;
| Quote: | | static float prev_temp=0.0 |
static int8 tim_12_hr;
struct time local_clock;
memcpy(&local_clock,&GLOB_clock, sizeof(struct time));
if(first)
{
firts=false;
avgsum=local_clock.adcvalz*8;
}
else
{
avgsum+=local_clock.adcvalz;
adcval=avgsum/8; //Average value- using/8 since in binary, this is quicker
avgsum-=adcval;
}
local_clock.Temp_deg = ((adcval - 559L)/2); //Temp_Kelvin = (Temp_degrees + 273.15); Temp_Kelvin =((((float)val*5)/1024)-273.15);
//Displaying time here
if((local_clock.hrs)>=13) tim_12_hr=(local_clock.hrs)-12;
else tim_12_hr=local_clock.hrs;
lcd_gotoxy(4, 1); //lcd_putc("LCD Ready...");
printf(LCD_PUTC,"%02d:%02d:%02d\n",tim_12_hr,local_clock.mins,local_clock.secs);
lcd_gotoxy(12, 1);
if(local_clock.hrs>11) lcd_putc("PM");
else lcd_putc("AM");
//local_clock. ADC_Results=(local_clock.val/=10);
lcd_gotoxy(4,2);
| Quote: | if(local_clock.Temp_deg>prev_temp)
{
prev_temp=local_clock.Temp_deg;
printf(LCD_PUTC," %2ld %2.1f\n\r",adcval,local_clock.Temp_deg);
//printf(LCD_PUTC," %2u %2.1f\n\r",local_clock.ADC_Results,local_clock.Temp_deg);
}
else {} |
}  |
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