init_timer0.c

Nucleus嵌入式操作系统在s3c2410上的一个应用程序实验

#include "2410addr.h"

/*************************************************
	timer0是系统时钟                10ms
 ************************************************/

 void INT_Timer_Initialize(void)
{ 
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
 /*                                                                 */
 /*     Fout(s)=[(prescaler+1)*(TCNTB+1)]/[pclk*divider]=40ms       */
 /*                                                                 */
 /*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
	
	rTCFG0=(rTCFG0&~0xFF)|0x64; 	//prescaler0 100
	rTCFG1=(rTCFG1&~0x0F)|0x01; 	//divide value 1/4
	rTCNTB0=5000;	//TCNTB=5000
	rTCMPB0=3000;
	rTCON=(rTCON&~0xFF)|0x0a;  	//auto load, invert off, manual update, stop timer
	
	/*INTIALIZE THE INTERRUPT*/
	rINTMOD=0x0;  	//all irq
	rINTMSK=0xffffffff; 	 //disable all interrupt source
	rINTSUBMSK=0xffff; 		//disable all sub interrupt source


}

void EnableTimer0(void)
{
	rINTMSK=~(BIT_TIMER0);
	rTCON=(rTCON&~0xFF)|0x09;
}