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ADC of PIC18F4431, help me. Please!

 
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nhamdtk4



Joined: 18 May 2009
Posts: 8
Location: Việt Nam

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ADC of PIC18F4431, help me. Please!
PostPosted: Sat Sep 26, 2009 10:44 am     Reply with quote
I have a project and it use module A/D converter with PIC18F4431. But I can't use config ADC. Can you help me. Thank!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Sep 26, 2009 11:48 am     Reply with quote
See the sample code at the end of this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=34386
nhamdtk4



Joined: 18 May 2009
Posts: 8
Location: Việt Nam

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PostPosted: Sun Sep 27, 2009 6:58 am     Reply with quote
I have tried it but it is false with 18F4431. So I don't understand what must I do if I use 18F4431.
PCM programmer



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Posts: 21708

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PostPosted: Sun Sep 27, 2009 12:57 pm     Reply with quote
Use the program shown below. It works. I turned the 10K trimpot
on Pin A0 so it goes from the lower limit to the upper limit. Here is
the output. It's correct.
Quote:

0000
0000
0056
00A9
0104
0169
01AF
02BC
0335
03E3
03FF
03FF
03FF


Here is the test program. It's running on a PicDem2-Plus board and
was compiled with PCH vs. 4.099:
Code:

#include <18F4431.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(sAN0);
setup_adc(ADC_CLOCK_DIV_32);
set_adc_channel(0);
delay_us(15);

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

}
Kenny



Joined: 07 Sep 2003
Posts: 173
Location: Australia

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PostPosted: Sun Sep 27, 2009 2:59 pm     Reply with quote
nhamdtk4 wrote:
I have tryed it but it is false with 18F4431. So I don't understand what must i do if i use 18F4431.


Are the AVdd and AVss pins connected?

AVdd to Vdd, and AVss to Vss.
nhamdtk4



Joined: 18 May 2009
Posts: 8
Location: Việt Nam

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PostPosted: Fri Oct 02, 2009 4:07 am     Reply with quote
Thank PCM programmer, thank Kenny very much. I have resolved my problem.
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