system.c

TPSN时间同步算法

//*****************************************************//
// File: system.h for S3C44B0
// Author: yanhc
// Organisition: NUC1200
// Description: Define the common function for the WSN node board
// Creat time: 2008.11.16
// Revision: 
//*****************************************************//
#include "44b.h"
#include "44blib.h"
#include "system.h"

void Delayus(int time)
{
 int i;
 while(time-- != 0)
 {
     for(i=0; i<3; i++) ;
 }
}

void Delayms(int time)
{
 while(time-- != 0)
 {     
     Delayus(2000);   
 }
}

void redLedBlk(void)
{
     rPDATC &= ~(0x0400);
     Delay(500);
     rPDATC |= 0x0400;
     Delay(500);
}

void grnLedBlk(void)
{
     rPDATC &= ~(0x0800);
     Delay(500);
     rPDATC |= 0x0800;
     Delay(500);
}

void Int_Init(void)
{
  /*INT3 INT1 trigged by 0:low level;2:falling edge*/
  rEXTINT = 0x2000;
  
  //Interrupt mask,enable EINT1 EINT3
  //rINTMSK = ~(BIT_GLOBAL | BIT_EINT1 | BIT_EINT3);
  //rINTMSK = ~(BIT_GLOBAL | BIT_EINT3 | BIT_URXD1 | BIT_TIMER3);
  rINTMSK = ~(BIT_GLOBAL | BIT_EINT3 | BIT_TIMER3);
  //rINTMSK = BIT_GLOBAL;  //Disble all interrupt
  //Vectored interrupt, enable the global
  //INTCON
  //  2     1        0
  //  0     0        1
  // Vector enable  stop
  rINTCON = 0x1;
}

void Zdma0Init(int srcAddr,int dstAddr,int length)
{
    rZDISRC0 = srcAddr|(1u<<30)|(3u<<28); // word,fixed
    rZDIDES0 = dstAddr|(2u<<30)|(1u<<28); // inc
    rZDICNT0 = length|(2<<28)|(1<<26)|(3<<22)|(0<<20);
    rZDICNT0 |= (1<<20);//after ES3
    //whole,unit transfer,int@TC,enable DMA
    
}

void Timer_Init(void)
{
/*	
 *	Timer Clock Frequency = MCLK/pre/mux
 */	
    rTCFG0=0x00000f00;	//dead zone=0,pre2=0,pre1=0xf,pre0=0xf
    rTCFG1=0x00000000;	//all interrupt,mux5=1/2,mux4=1/2,mux3=1/2,mux2=1/2,mux1=1/2,mux0=1/2
    
    //rTCNTB3=0xc350;		//(1/(60MHz/4/15))*0xc350=50ms
    rTCNTB3=0x2;			//(1/(60MHz/2/15))*0x2=1us
  
    rTCMPB3=0x0;

    rTCON=0x0020000;	//update T3
    rTCON=0x0090000;	//T3=auto reload,start	
    
    
    //rINTMSK=BIT_GLOBAL;
    //rINTMSK=~(BIT_GLOBAL|BIT_TIMER3);	//start timer3 INT
}