Help me code này với

[vungocbac]

mình viết code đọc nhiêt độ từ LM35 bẳng HT-PIC cho 16f887A.
nhưng lỗi không đọc được chỉ hiện 0.000 C.
anh chị em giúp mình với.

PHP Code:

#include <htc.h>
#include <stdio.h>
#include "lcd.h"
__CONFIG(FOSC_INTRC_NOCLKOUT&MCLRE_ON*WDTE_OFF&LVP_OFF);
#define _XTAL_FREQ      4000000
unsigned char temp;
//--------------------------------
//KHOI TAP PORT
void port_init()
               {
                   ANSEL|=1<<3;
                   ANSELH|=0;      //RA3 LA INPUT
                   TRISA3=1;
                   TRISB=0X00;     //PORTB LA OUTPUT
                   PORTB=0X00;
                   TRISE=0X00;
                   PORTE=0X00;
               
                   PSA=0;
                   PS2=1;
                   PS1=1;
                   PS0=1;
                               
               }
//-------------------------------
void adc_init()
              {
                  ADCS1=1;            //CHON TAN SO LAY MAU
                  ADCS0=0;            //suy ra toc do chuyen doi ADC la Fosc/32.
                  VCFG1=0;            // chon dien ap lay mau la dien ap noi
                  VCFG0=0;
                  CHS3=0;
                  CHS2=0;              //chon kenh AN3
                  CHS1=1;
                  CHS0=1;
                  ADFM=1;              //CHON DINH DANG KET QUA ADC    
                  ADON=1;              //KET QUA DICH PHAI
              } 
//-------------------------
void interrupt_init()
               { 
             
                 PEIE=1;          //VI NGAT NGOAI VI NEN SET=1
                 ADIF=0;
                 ADIE=1;
               
                
                }
//---------------------------
void interrupt isr()
                {
                   int read_adc;
                      if(ADIE&&ADIF)
                             {
                                ADIF=0;
                                read_adc=(ADRESH<<8|ADRESL);
                                read_adc=(read_adc*5000)/1024;
                                temp=read_adc/10;
                              }
                 
                }  
//------------------------------------------
void lcd_adc(int i)
                {  
                
                  char a,b,c,d;
                  a=i/1000;
                  b=(i-a*1000)/100;
                  c=(i-a*1000-b*100)/10;
                  d=i-a*1000-b*100-c*10; 
                  lcd_putc(a+0x30);
                  lcd_puts(".");
                  lcd_putc(b+0x30);
                  lcd_putc(c+0x30);
                  lcd_putc(d+0x30);
                  lcd_puts("  C");
                  
                  }
//-----------------------------
void main()
             {
                    port_init(); 
                    adc_init();                                 
                    interrupt_init();
                    lcd_init();
                     __delay_ms(100);
                   
                while(1)
               {    
                   lcd_clear();
                   lcd_puts("DO NHIET DO=LM35");
                   lcd_gotoxy(4,1);
                   lcd_adc(temp);                                         
                   GO_nDONE;
                   __delay_ms(100);
               }      
         }