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where to find the ADC output of printf?

 
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where to find the ADC output of printf?
PostPosted: Tue Sep 29, 2009 11:39 pm     Reply with quote
Hi, can anybody tell me where the get the output of the following code ?
I want to use the output of the ADC to program something else.
Code:

#include <18F452.h>
#device adc=10
#fuses HS,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

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

setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_DIV_32);
set_adc_channel(0);
delay_us(15);

while(1)
  {
   result = read_adc();
   printf("%LX ", result);
   delay_ms(500);
  }

}

Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Sep 29, 2009 11:52 pm     Reply with quote
Get it in a terminal window on your PC.
You can use Hyperterminal, which comes with Microsoft Windows,
or you can use TeraTerm. Instructions on how to install TeraTerm:
http://www.ccsinfo.com/forum/viewtopic.php?t=39388&start=18

This assumes you are running the program on a PIC installed on a
real hardware board (not a simulation).
fr0stb0iz



Joined: 29 Sep 2009
Posts: 13

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PostPosted: Wed Sep 30, 2009 12:05 am     Reply with quote
Hi thanks for the reply, I am new to CCS, is it possible to just use the output directly instead of using the terminal program ?

I want to make a simple program by getting the input from a function generator (PORTA) ---> into the ADC ---> output display onto the LED display ( PORTD)

This is my current code.
Code:

#include <18F452.h>
#device adc=10
#fuses HS,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#byte PORTD = 8 // testing .
#define ALL_OUT 0x00
#define ALL_IN 0xff


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

set_tris_d(ALL_OUT);
PORTD = 0;
setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_DIV_32);
set_adc_channel(0);
delay_us(15);
//output_low(portd);
set_tris_d(ALL_OUT);
PORTD = 0;
while(1)
  {
   PORTD = read_adc();
//   result = PORTD;

   //printf("%LX ", portd);
   delay_ms(500);
  }

}

Thank you.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Sep 30, 2009 12:48 am     Reply with quote
You don't need to set the TRIS. You don't need to write to Port D directly,
so you don't need the #byte statement. Just use the output_d() function.
This will set the TRIS correctly and it will write to Port D. Example:
Code:

result = read_adc();
output_d(result);


Also, it's clear that you want only 8 bits from the A/D, so tell the compiler
to use 8-bit mode. Change the #device statement to this:
Code:
#device adc=8
fr0stb0iz



Joined: 29 Sep 2009
Posts: 13

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PostPosted: Wed Sep 30, 2009 1:31 am     Reply with quote
Thank you very much, I managed to display the output onto the LED,
but can you tell me what is the difference between:
Code:
setup_adc(ADC_CLOCK_DIV_32);

&
Code:
setup_adc(ADC_CLOCK_INTERNAL);

Code:
while(1)
  {
   result = read_adc();
   output_d(result);

   //printf("%LX ", portd);
   delay_ms(50);
  }

What about the delay ? When I remove the delay, it works fine. However when I add in some delay, the output seems to be in a mess.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Sep 30, 2009 12:13 pm     Reply with quote
Quote:

Can you tell me what is the difference between:
setup_adc(ADC_CLOCK_DIV_32);
&
setup_adc(ADC_CLOCK_INTERNAL);

Look in the ADC section of your PIC's data sheet. It explains how to
choose the best clock divisor, based on the oscillator frequency of your
PIC. It also has a note on when you're allowed to use the interna A/D
clock. Look in this section, on page 188 in the Acrobat reader:
Quote:
17.2 Selecting the A/D Conversion Clock
http://ww1.microchip.com/downloads/en/DeviceDoc/39564c.pdf

Quote:

What about the delay ? When I remove the delay, it works fine. However
when I add in some delay, the output seems to be in a mess.

I don't know. Explain your hardware. Explain what your project is.
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