#include <hidef.h> /* for EnableInterrupts macro */
#include "derivative.h" /* include peripheral declarations */

unsigned char aa=0;
unsigned char bb=0;
unsigned char cc=0;

unsigned long int maichongcaiyang_2,maichongcaiyang_1,maichongcaiyang; //輸入捕捉脈沖采樣

unsigned char yichucishu; //輸入捕捉溢出次數 ,計算周期用

unsigned int tpmcnt_1; //上一次的計數值?計算周期用 



void mtpm_init(void);

void main(void) {

  EnableInterrupts; /* enable interrupts */

  SOPT=0x53;//屏蔽看門狗，看門狗溢出時間為長時間，屏蔽停止狀態，背景調試管腳使能，復位管腳使能！
  SPMSC1 = 0x1C; //低電壓強制MCU復位，停止狀態使能低電壓檢測，使能低電壓監測邏輯
 
  mtpm_init();
  for(;;) {
    __RESET_WATCHDOG(); /* feeds the dog */
    //TPMSC=0X16; 
    
  }

  
   /* loop forever */
  /* please make sure that you never leave main */
}
         
 /*TPM SETUP*/






/////////////////////////
// 輸入捕捉中斷模塊初始化
//作者 free-tech
//日期 2007，07，18
//初始化 
/////////////////////////


void mtpm_init(void)     //初始化程序調用

{
    TPM2CNT=0;           //計數器清零
    
    TPM2SC=0X4d;         //溢出中斷計數

    TPM2MOD=0XFFFF;      //模數置位
    
    TPM2C0SC=0X44;       //0通道輸入捕捉控制
    
    TPM2C0V=0;           //
    
    TPM2C1V=0X0;         //
    
    TPM2C1SC=0X68;       //輸出高有效的pwm   
   

}


/////////////////////////////////////
//MTPM溢出中斷
//通過中斷累加次數
/////////////////////////////////////
 interrupt 14 void   mtpm_ov(void)
 
 {
  TPM2SC_TOF=0;           //清處標志
 
  yichucishu++;          //累加溢出次數
 
 
 }
 
 
/////////////////////////////////////
//中斷
//輸入捕捉中斷
//

/////////////////////////////////////

 interrupt 12 void   mtpm_in(void)
 
 {                     
  unsigned int i;
  
  i=TPM2CNT;                     
  
  TPM2C0SC_CH0F=0;       //清處標志
  
  maichongcaiyang_2=maichongcaiyang_1; //保存上上次數據
  
  maichongcaiyang_1=maichongcaiyang;  //保存上次數據
  
  if(yichucishu==0)
   
  {
  maichongcaiyang=i-tpmcnt_1;
  
  }
  
  if(yichucishu==1)
  
  {
  maichongcaiyang=0xffff-(unsigned long int)tpmcnt_1+(unsigned long int)i;
  
  }
  
  if(yichucishu>=2)
  
  {
  maichongcaiyang=(unsigned long int)yichucishu*0xffff+(unsigned long int)i-(unsigned long int)tpmcnt_1;
   
  }
  
  maichongcaiyang=maichongcaiyang*8;  //計算本次脈沖,輸出以毫秒為單位
        
  tpmcnt_1=i;
  
  yichucishu=0;         //清零溢出次數
 
 }