adc_wdt.c

基于温度传感器LM35与PIC16F877A的应用程序

#include <pic.h> 
#define portbit(address,bits) ((unsigned)(&address)*8 + (bits)) 
#define BUSY 0x80 
#define WRITE_DATA 0xff 
#define delay_data 0xff 
#define COMMAND 0x00 
#define LCD_CLEAR 0x01 
#define portdata PORTB 

volatile bit E  @ portbit(PORTD,7); 
volatile bit RW @ portbit(PORTD,6); 
volatile bit RS @ portbit(PORTD,5); 
bank2 volatile unsigned int temperature[40];
volatile unsigned int checksum;
volatile unsigned char count;
volatile double squ;
volatile bit disp_reload;

void delay(unsigned int delay_time) 
{ 
  unsigned char i;
  while (delay_time--)
  {
   for (i = 0; i <0xff; i ++)
    {
      } 
   }
}  

void wdt_init(void) {
  PSA = 1;
  OPTION |= 0x07;
   }

void clean_wdt(void)
 {
  CLRWDT();
  }

unsigned char lcd_busy(void) 
{ 
  unsigned char temp; 
   
  portdata = 0xff; 
  RS = 0; 
  RW = 1; 
  E = 1; 
  TRISB = 0xff; 
  temp = portdata; 
  TRISB = 0x00; 
  E = 0; 
  return (temp); 
} 

void lcd_command_writedata(unsigned char check,unsigned char data) 
{ 
  if (check == COMMAND) 
  { 
   RS = 0; 
   } 
  else 
  { 
   RS = 1; 
  } 
  RW = 0; 
  portdata = data; 
  E = 1; 
  E = 0; 
  while (lcd_busy() & BUSY); 
} 

void lcd_disp(unsigned char adr,unsigned char disp_data) 
{ 
 lcd_command_writedata(COMMAND,adr);
 lcd_command_writedata(WRITE_DATA,disp_data);
} 

void lcd_init(void) 
{ 
  lcd_command_writedata(COMMAND,LCD_CLEAR); 
  lcd_command_writedata(COMMAND,0x38); 
  lcd_command_writedata(COMMAND,0x0e); 
  lcd_command_writedata(COMMAND,0x06); 
} 
void system_init(void) 
{ 
  INTCON = 0x00; 
  OPTION = 0xff;
  TRISB = 0x00; 
  TRISD = 0x00; 
} 

void adc_init(void)
{
 ADCON1 = 0x8e;
 ADCON0 = 0xc1;
 ADIF = 0;
 PEIE = 1;
 ADIE = 1;
 TRISA0 = 1;
 count = 0;
 disp_reload = 0;
  }

void tempature_disp(void)
{
 unsigned char i; 
 unsigned long temperature_temp;
 unsigned char a,b,c,d;
 
 clean_wdt();
 if (disp_reload)
  {
   di();
   for (i = 0; i < 40; i ++)
     {
      checksum = checksum + temperature[i];
       }
   squ = (double)checksum;
   squ = squ / 4;
   temperature_temp = (unsigned long)((100 * squ) / 1023);
   a = temperature_temp / 100;
   lcd_disp(0x85, a + 0x30);
   d = temperature_temp % 100;
   b = d / 10;
   lcd_disp(0x86, b + 0x30);
   lcd_disp(0x87, 0x2e);
   c = temperature_temp - a * 100 - b * 10; 
   lcd_disp(0x88, c + 0x30);
   lcd_disp(0x89, 0xdf);
   lcd_disp(0x8a, 0x43);
   checksum = 0;
   count = 0;
   disp_reload = 0;
   lcd_disp(0xcf, 0xfe);
   clean_wdt();
   delay(300);
   clean_wdt();
   ei();
    }
  } 
void main(void) 
{ 
 system_init(); 
 adc_init();
 lcd_init();
 wdt_init();
 clean_wdt();
 ADCON0 |= 0x04;
 ei();
 while (1) 
 {
   tempature_disp();
   SLEEP();
  } 
}

void interrupt adc_interrupt(void)
 {
  clean_wdt();
  ADIF = 0;
  temperature[count] = (ADRESH << 8) + ADRESL;
  count ++;
  if (count == 40)
   {
    disp_reload = 1;
     }
  ADCON0 |= 0X04;
 }