tpm.c

用于WSN的PDA搜救器

/* Description : TIME/PWM functions.
 *
 * $Author: 王琢玉
 * $Date: 2007/02/23 
 * $Name:  TPM.c 
 */

#define   TPM_GLOBALS

#include "include.h"

extern UINT8  AskForEntironment;


/********************************************************************************
    MC13213 有两个 TIMER，采用 TIMER2 做计数器。
    TIMER2 有一个计数器，4个定时/比较器，计数器时钟采用 BUS CLOCK 进行分频到 62.5k，
MC13213的是一个16位的计数器，周期为1.04秒，因此定义一个16位的全局变量 UINT16 time2Ext，
将计数器扩展为32位。

********************************************************************************/





/************************************************************
Function:    void  InitMcuTimer2(void)

Parameter:   

Return:      
             
Description: Init the timer2
************************************************************/
void  InitMcuTimer2(void)
{
    /* ### Init_TPM init code */
    TPM2MOD = 0xf424;                                      
    /* TPM2SC: TOF=0,TOIE=1,CPWMS=0,CLKSB=0,CLKSA=1,PS2=1,PS1=1,PS0=1 */
    TPM2SC = 0x56; //计时器的频率为 62.5k  (use XCLK, device = 64)
    
    TPM2CNTH = 0;
    TPM2CNTL = 0;  //计数器清零
    
    TPM2C0SC = 0x10;
    
    time2Ext = 0;             
}

/************************************************************
Function:    TIME  TimeGet(void)

Parameter:   

Return:      current time
             
Description: Get current time
************************************************************/
TIME  TimeGet(void)
{
    TIME Time;
    
    SaveStatusReg();
    Time.Byte.b1 = TPM2CNTH;
    Time.Byte.b0 = TPM2CNTL;
    Time.Byte.b3 = (UINT8)(time2Ext >> 8);
    Time.Byte.b2 = (UINT8)time2Ext; 
    RestoreStatusReg();
    
    CLRWDT();
    
    return  Time;
}

/************************************************************
Function:    void OneMilliSecondDelay(void)

Parameter:   

Return:     
             
Description: Delay one second
************************************************************/
void OneMilliSecondDelay(void)
{
    TIME   currentTime;
    
    currentTime = TimeGet();
    
    while(TimeGetDiff(TimeGet(),currentTime)< ONE_MILLISECOND)CLRWDT();
}

/************************************************************
Function:    void N_milliSecondsDelay(UINT32 MilliSeconds)

Parameter:   UINT32 MilliSeconds    how  many millisenconds you want to delay

Return:     
             
Description: Delay N millisenconds
************************************************************/
void N_milliSecondsDelay(UINT32 MilliSeconds)
{
    while(MilliSeconds > 0)                                              
    {
        OneMilliSecondDelay();
        MilliSeconds --;
    }
}
      
/************************************************************
Function:    interrupt void VTPM2Ovf(void)

Parameter:   

Return:     
             
Description: 
************************************************************/    
interrupt void VTPM2Ovf(void)
{
    TPM2SC = TPM2SC & 0x7f;
    time2Ext ++; 
    AskForEntironment = 1;     
}

/************************************************************
Function:    interrupt void TPM2C0(void)

Parameter:   

Return:     
             
Description: 
************************************************************/  
interrupt void TPM2C0(void)
{
    TPM2C0SC &= 0x3f;
    Sci2Info.bits.RxOnePacket = 1;    
}