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adc problem

 
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andys



Joined: 23 Oct 2006
Posts: 175

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adc problem
PostPosted: Thu May 31, 2007 2:54 am     Reply with quote

I USE piC16F777 AND I HAVE PROBLEM WITH ADC.My code is bellow
#include <16F777.h>
#device ADC=10
#fuses XT,NOWDT,NOPROTECT,PUT

#use delay(clock=4000000)








void main()
{
long adc_result;



//SET_TRIS_A(0XFF);
//SET_TRIS_B(0X00);

setup_adc_ports(ALL_ANALOG);
setup_adc(ADC_CLOCK_DIV_16);

while(1){
set_adc_channel(0);
delay_us(1);

adc_result=read_adc();

output_high(PIN_B0);
//adc_result=read_adc(ADC_START_AND_READ);




if (adc_result<=4) output_high(PIN_B0); else output_low(PIN_B0);
if ((adc_result>4)&&(adc_result<=64)) output_high(PIN_B1); else output_low(PIN_B1);
if ((adc_result>64)&&(adc_result<=128)) output_high(PIN_B2); else output_low(PIN_B2);
if (adc_result>255)output_high(PIN_B3); else output_low(PIN_B3);

}
}


afterb the instruction adc_result=read_adc();
can not doing anything (can execute the instruction output_high(PIN_B0);)
inservi



Joined: 13 May 2007
Posts: 128

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PostPosted: Thu May 31, 2007 3:45 am     Reply with quote

Hello,

here is your code more readable for anybody:

Code:

#include <16F777.h>
#device ADC=10
#fuses XT,NOWDT,NOPROTECT,PUT
#use delay(clock=4000000)

void main (){
 long adc_result;
   //SET_TRIS_A(0XFF);
   //SET_TRIS_B(0X00);
   setup_adc_ports(ALL_ANALOG);
   setup_adc(ADC_CLOCK_DIV_16);
   while(1){
      set_adc_channel(0);
      delay_us(1);
      adc_result=read_adc();
      output_high(PIN_B0);
      //adc_result=read_adc(ADC_START_AND_READ);
      if (adc_result<=4) output_high(PIN_B0); else output_low(PIN_B0);
      if ((adc_result>4)&&(adc_result<=64)) output_high(PIN_B1); else output_low(PIN_B1);
      if ((adc_result>64)&&(adc_result<=128)) output_high(PIN_B2); else output_low(PIN_B2);
      if (adc_result>255)output_high(PIN_B3); else output_low(PIN_B3);
   }
}
//afterb the instruction adc_result=read_adc();
//can



If you declare setup_adc_ports(ALL_ANALOG), then i think that The pin B0, B1, B2 and B3 are analogue on the 16F777.

Try to keep the digital to be digital with constant below:

Code:
// Constants used in SETUP_ADC_PORTS() are:
#define NO_ANALOGS   0x0F   // None
#define ALL_ANALOG   0x00   // A0 A1 A2 A3 A5 E0 E1 E2 B2 B3 B1 B4 B0 B5
#define AN0_TO_AN12  0x02   // A0 A1 A2 A3 A5 E0 E1 E2 B2 B3 B1 B4 B0   
#define AN0_TO_AN11  0x03   // A0 A1 A2 A3 A5 E0 E1 E2 B2 B3 B1 B4       
#define AN0_TO_AN10  0x04   // A0 A1 A2 A3 A5 E0 E1 E2 B2 B3 B1         
#define AN0_TO_AN9   0x05   // A0 A1 A2 A3 A5 E0 E1 E2 B2 B3             
#define AN0_TO_AN8   0x06   // A0 A1 A2 A3 A5 E0 E1 E2 B2               
#define AN0_TO_AN7   0x07   // A0 A1 A2 A3 A5 E0 E1 E2                   
#define AN0_TO_AN6   0x08   // A0 A1 A2 A3 A5 E0 E1                     
#define AN0_TO_AN5   0x09   // A0 A1 A2 A3 A5 E0                         
#define AN0_TO_AN4   0x0A   // A0 A1 A2 A3 A5
#define AN0_TO_AN3   0x0B   // A0 A1 A2 A3
#define AN0_TO_AN2   0x0C   // A0 A1 A2
#define AN0_TO_AN1   0x0D   // A0 A1
#define AN0          0x0E   // A0
#define AN0_TO_AN12_ANALOG     0x02   //!old only provided for compatibility   
#define AN0_TO_AN11_ANALOG     0x03   //!old only provided for compatibility
#define AN0_TO_AN10_ANALOG     0x04   //!old only provided for compatibility
#define AN0_TO_AN9_ANALOG      0x05   //!old only provided for compatibility
#define AN0_TO_AN8_ANALOG      0x06   //!old only provided for compatibility
#define AN0_TO_AN7_ANALOG      0x07   //!old only provided for compatibility   
#define AN0_TO_AN6_ANALOG      0x08   //!old only provided for compatibility   
#define AN0_TO_AN5_ANALOG      0x09   //!old only provided for compatibility   
#define AN0_TO_AN4_ANALOG      0x0A   //!old only provided for compatibility
#define AN0_TO_AN3_ANALOG      0x0B   //!old only provided for compatibility
#define AN0_TO_AN2_ANALOG      0x0C   //!old only provided for compatibility
#define AN0_TO_AN1_ANALOG      0x0D   //!old only provided for compatibility
#define AN0_ANALOG             0x0E   //!old only provided for compatibility


You can find them in your '16F777.h' file.

I suppose that your code will work with setup_adc_ports(AN0) or
somthink like setup_adc_ports(AN0_TO_AN4) it depend to the number of analogue pins you need.

dro
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andys



Joined: 23 Oct 2006
Posts: 175

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adc problem
PostPosted: Thu May 31, 2007 5:25 am     Reply with quote

I try this and the problem is still there
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