freescale

Freescale 系列单片机常用模块与综合系统设计

#include "IO_Map.h"
#include "LIGHT_AD.h"
#include "IRLED.h"
#include "OAPOWER.h"
#include "LED.h"


unsigned int dark_buffer[4];            // buffer for 4 ADC samples
unsigned int light_buffer[4];           // buffer for 4 ADC samples
unsigned int dark_average;              // Average 4 samples with no IRLED
unsigned int light_average;             // Average 4 samples with IRLED on
unsigned char smoke_detect_count = 0;   // Counter for smoke detections
unsigned char alarm_flag = 0;           // Alarm status. 1 means smoke

void Sample (void)
{
  unsigned char i, temp;

  temp = PTBD;                         // Preserve LED "on" if alarming
  OAPOWER_SetVal();                     // Turn on OA. Settling delay is below
  LED_SetVal();
  
  for(i =0;i< 4;i++)
  {
    LIGHT_AD_Measure(0x01);                //启动A/D转换
    LIGHT_AD_GetValue(dark_buffer);        //读取A/D转换结果
    
  }
  
  IRLED_SetVal();                     // Turn on IRLED
                                
  for(i =0;i< 4;i++)
  {
    LIGHT_AD_Measure(0x01);
    LIGHT_AD_GetValue(light_buffer);
    
  }
                                
  PTBD = temp;                         // Restore P1OUT, turns off IRLED and OA
}

void Average (void)
{
  unsigned int i;

  dark_average = 0;
  light_average = 0;

  for (i = 0; i < 4; i++)
  {
    dark_average += dark_buffer[i];
    light_average += light_buffer[i];
  }
  dark_average = (dark_average >> 2);
  light_average = (light_average >> 2);
}