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Guest
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where to find the ADC output of printf? |
Posted: Tue Sep 29, 2009 11:39 pm |
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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);
}
}
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Thanks |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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Posted: Tue Sep 29, 2009 11:52 pm |
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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). |
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fr0stb0iz
Joined: 29 Sep 2009 Posts: 13
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Posted: Wed Sep 30, 2009 12:05 am |
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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);
}
}
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Thank you. |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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Posted: Wed Sep 30, 2009 12:48 am |
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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);
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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:
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fr0stb0iz
Joined: 29 Sep 2009 Posts: 13
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Posted: Wed Sep 30, 2009 1:31 am |
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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);
}
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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. |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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Posted: Wed Sep 30, 2009 12:13 pm |
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Quote: |
Can you tell me what is the difference between:
setup_adc(ADC_CLOCK_DIV_32);
&
setup_adc(ADC_CLOCK_INTERNAL);
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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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