os_cpu_c.c

uc/os操作系统在msp430单片机上的移植

//==================================================
//:os_cpu.c
//		----
//--MSP430移植
//--2007/09	by zhaoert
//==================================================

#include "..\core\os.h"
#include <msp430x44x.h>

//------------------------------------------------------
#define TIMER_CNT   ((8000000/4)/HZ)    // (1/(8M/4))*TIMER_CNT=1/HZ 

//OSInitTick
void OSInitTick(void){
	//InitTick --- HZ=..., HZ is defined in os_cfg.h
	TACTL=TASSEL1+TACLR;        //use SMCLK, clear TAR
	CCTL0=CCIE;                 //enable IR
	CCR0=TIMER_CNT;
	TACTL|=MC0;                 //Timer_a增计数模式
}

//OSInitTaskStk
void OSInitTaskStk(void(*task)(void), OS_STK* ptos, INT8U TaskID){
	OS_STK* stk=ptos;
	INT16U tmp;
	tmp=(INT16U)task;
  
	*stk--=tmp;           //PC
  
	//*stk--=0x00;	        //R3
	*stk--=0x00;		//R4
	*stk--=0x00;		//R5
	*stk--=0x00;		//R6
	*stk--=0x00;		//R7
	*stk--=0x00;		//R8
	*stk--=0x00;		//R9
	*stk--=0x00;		//R10
	*stk--=0x00;		//R11
	*stk--=0x00;		//R12
	*stk--=0x00;		//R13
	*stk--=0x00;		//R14
	*stk--=0x00;		//R15
  
	*stk  =0x08;		//SR
  
	OSTaskStkPtr[ TaskID ] = stk;
}

//-------------------------------------------------------------------

//Timer ISR
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A(void){
  //OSTimeTick()=...
	INT8U i;
	for(i=1;i<OS_MAX_TASK+1;i++){
		if(OSWaitTick[i]!=0){
			OSWaitTick[i]--;
			if(OSWaitTick[i]==0){
				OSRdyTbl|=OSMaskTbl[i];
			}
		}
	}	
  
}

//:~