i need any code that working for adc PIC18F4550.
please help me...

only one analog input...in c language...

please help me..your help is greatly appreciated...

 

This was in my old snippets folder, For use with PicKit Demo Board.

Pretty straightforward. Mike Predko is the original author.

 
1: #include <pic.h>
 2: 
 3: int i, j;                       //  Array Pointers
 4: 
 5: int ADCState = 0;               //  Keep Track of ADC Operation
 6: int ADCValue = 0;               //  Initialize to zero on declaration
 7: 
 8: int Dlay = 63;                  //  LED Time on Delay Variable
 9: 
10: //Pattern to display on LEDs
11: const char PORTAValue[8] =
12:   { 0b010000, 0b100000, 0b010000, 0b000100, 0b100000, 0b000100,
13: 0b000100, 0b000010 };
14: //  Force off Array
15: const char NOTPORTA[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
16: 
17: // IO Ports, 1 = Input, 0 = Output
18: const char TRISAValue[8] =
19:   { 0b001111, 0b001111, 0b101011, 0b101011, 0b011011, 0b011011,
20: 0b111001, 0b111001 };
21: 
22: main ()
23: {
24:   PORTA = 0;
25:   ANSEL = 1                                      //  Just RA0 is an Analog Input
26:   MCON0 = 7;                                     //  Turn off Comparators
27: 
28:   ADCON0 = 0b00000001;                           //  Turn on the ADC
29:                                                  //   Bit 7 - Left Justified Sample
30:                                                  //   Bit 6 - Use VDD
31:                                                  //   Bit 4:2 - Channel 0
32:                                                  //   Bit 1 - Do not Start
33:                                                  //   Bit 0 - Turn on ADC
34:   ADCON1 = 0b00010000;                           // Clock ADC from FOSC/8
35: 
36:   while (1 == 1)                                 //  Loop Forever
37:     {
38:       for (i = 0; i < 8; i++)
39:         {                                        //  Loop through Each of the 8 LEDS
40:           for (j = 0; j < Dlay; j++);           //  Display "On" Delay Loop
41:           if ((ADCValue & (1 << i)) == 0)
42:             PORTA = NOTPORTA[i];                 // Change lit LEDs
43:           else
44:             PORTA = PORTAValue[i];
45:           TRISA = TRISAValue[i];
46:         }
47:       switch (ADCState)                          //  ADC State Machine
48:         {
49:         case 0:                                  //  Finished, Start Next Sample
50:           GODONE = 1;
51:           ADCState++;
52:           break;
53:         case 1:                                  //  Wait for ADC to complete
54:           if (!GODONE)
55:             ADCState++;                          //  Sample Finished
56:           break;
57:         case 2:                                  //  Save Sample Value in "ADCValue"
58:           ADCValue = ADRESH;
59:           ADCState = 0;
60:           break;
61:         }
62:     }
63: }

Colorizing from: http://www.chamisplace.com/colorizer/cc.asp