uhal.c

在S3C44b0上移植ucos并实现哲学家就餐问题的演示

/*********************************************************************************/
//NAME:UAHL.C
//Modified by WangZengzhi 2008.6
/*********************************************************************************/
#include "..\inc\WOPTIONS.H"
#include "..\ucos\includes.h"
#include "..\porting\port.h"
/*********************************************************************************/

#define	  _TICK	1000				//  1/1000 sec
#define   _CLOCK	((MCLK)/0xf/4/(_TICK))
/*Timer input clock Frequency = MCLK / {prescaler value + 1} / {divider value}
{prescaler value} = 0-255
{divider value} = 2, 4, 8, 16, 32*/

/*********************************************************************************/
//Initialze interrupts.
void uHALr_InitInterrupts(void)
{
	// Non-vectored,IRQ disable,FIQ disable    
    rINTCON=0x0;	  

	// All=IRQ mode
    rINTMOD=0x0;	  

	// All interrupt is masked.
    rINTMSK=BIT_GLOBAL;	  
}//uHALr_InitInterrupts

/*********************************************************************************/
//Initialize timer that is used OS.
void uHALr_InitTimers(void)//use timer1
{
	rTCFG0=0x0f0f0f; 	//prescaler =15
	rTCFG1=0x11111;		//0001  1/4
	rTCNTB1= _CLOCK;	//counter
	rTCMPB1= 0x0;
	rTCON=(0x2<<8);		//update mode for TCNTB1 and TCMPB1.
	rTCON=(0x9<<8);		//timer1 = auto reload, start
}//uHALr_InitTimers
/*********************************************************************************/

/*********************************************************************************/
extern void IRQ_Handler(void);
/*********************************************************************************/ 
void uHALr_InterruptRequestInit()
{
//	pISR_IRQ= (unsigned) IRQ_Handler;	//irq interrupt
	SetISR_Interrupt(INT_TIMER1_OFFSET,OSTimeTick,NULL);
}

/*********************************************************************************/
//Start system timer & enable the interrupt.
void uHALr_InstallSystemTimer(void)
{
	//Non-vectored,IRQ enable,FIQ disable 
	rINTCON=0x5;

	//Non maksed TIMER0 .
//	rI_ISPC=BIT_TIMER1;
	
	rINTMSK=~(BIT_TIMER1 | BIT_GLOBAL);	//Default value=0x7ffffff
}//uHALr_InstallSystemTimer


void ARMTargetInit(void)
{

		Port_Init();
  	  	Uart_Init(0,115200);
		Uart_Printf("\nBegin to run uC/OS-II!\n");
		
		uHALr_InitInterrupts();
		uHALr_InitTimers();
		uHALr_InterruptRequestInit();
/////////////////////////////////////////////////////////////////

}