more problems with printf!!!

[angel]

I use a PIC 16F872 and a Max 232 CPE.
I have some problems with the printf function.
For exemple :
1)
..........................
printf ("f1,\n\r");
delay_ms(100);
value=Read_ADC();
printf("A/D value=%2x \n\r",value);
printf("f2,\n\r");

What happen? I read in my computer only f1. It doesn't appear A/D... and f2. The program jumps all the printf afther the first!!!

2)
....................................
printf ("f1,\n\r");
printf ("f2,\n\r");

What happen? In this case the answer is correct. I read in my computer f1 and f2.

3) Between printf f1 and printf f2 I changed the lines. Before I wanted to read a value after a ADC and now I use some lines from the DS1624.c driver of CCS. I want to read a temperature value.

..................................
printf ("f1,\n\r");
init_temp();
temp=read_temp();
printf("Temp(F):%6.4f\r\n",temp);
printf ("f2,\n\r");

what happen? the same that 1). Only I read in my computer f1.

Conclusion : When I try to read a value from out the PIC I can't read it using the function printf.

What happen? Does anyone know the solution of this problem?
Thanks for your answer.

[Mark]

My conclusion you didn't setup the ADC correctly and its waiting for the value. Nothing to do with printf.

[SherpaDoug]

From what you have told us Mark's conclusion seems right. Try commenting out one line at a time to see what the effect of each one is.
_________________
The search for better is endless. Instead simply find very good and get the job done.

[Mark]

To prove me right angel could add

[angel]

hi
Ok it seems it is the ADC.
My software is :
...........................
main(){

int value;
setup_port_a(ALL_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);
set_adc_channel(2);
while(1) {
if (kbhit) {

printf("f1 \n\r");
delay_ms(100);
value=Read_ADC();
printf ( "A/D value =%2x \n\r");
printf("f2 \n\r");
}
}
}


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I try to read the out from a CNY70 sensor. It works correctly.
is "set_adc_channel(2);" the pin_A2?
is the software correct?
My PIC is a 16F872 and my quartz is 4 MHz.