pwm.c

对研究uc_os操作系统的非常有帮助

#include <string.h>
#include "..\inc\44b.h"
#include "..\inc\44blib.h"
#include "..\inc\timer.h"



////#include "../SOURCE/includes.h"               // uC/OS interface
//#include "../inc/44blib.h"
////#include "../inc/def.h"

//#include "../inc/44b.h"





#define READ_COUNT2 (rTCNTO2 & 0xffff)
#define	MaxBeepFreq	50000
#define	MinBeepFreq	20


#define  Fclk 50000000          // 工作频率 50 MHz.
#define OS_TICKS_PER_SEC        200    /* Set the number of ticks in one second                        */

//extern int  Uart_GetIntNum(void);
void SetBeepPwm(unsigned short Freq, unsigned char HiRatio);
void StopBeepPwm(void);

void Init_Timer5 (void);
//void __irq TIMER2_int(void);
void __irq TIMER5_int(void);
 //volatile int isWdtInt;
unsigned int pwmcnt=0;

unsigned int OsEnterSum;
//extern int  I_ISPC;

/****************************************
 *	PWM (BEEP) test		*
 ****************************************/
void Test_Pwm(void)
{
  
    Uart_Printf("[pwm (beep)  Test]\n");
  
    rINTCON = 5; 
    rINTMOD = 0;
 
   pISR_TIMER5= (unsigned  int)TIMER5_int;
   
    rPDATE = 0x157;				//Beep = 10
    rPCONE = 0x596b;      // tout2				
    rPUPE  = 0xff;
         pwmcnt=0;

	 Init_Timer5();

  
 //  while(1)
  // {;}
 

  
}





void Init_Timer5 (void)
{
#define  Prescaler2 25                                  // CLK = 1MHz.
#define  MUX5       0
#define  Count      Fclk/(2*Prescaler2)/OS_TICKS_PER_SEC

    rTCON  &= ~(0x07 << 24);                             // Stop Timer5.
    rTCFG0  = (rTCFG0 & ~(0x0ff << 16)) | (Prescaler2 << 16);
    rTCFG1  = (rTCFG1 & ~(0x0f  << 20)) | (MUX5 << 20);
    rTCNTB5 = Count;
    rTCON  |= (0x06 << 24);                               // 手动下载周期值,并设置为自动装载.
    rTCON   = (rTCON & ~(1 << 25)) | (1 << 24) ;           // 启动.

    rINTMSK &= ~((1 << 26) + (1 << 8));                   // 开中断屏蔽及全局屏蔽位.
}



void __irq TIMER5_int(void)
{rI_ISPC |= (1 << 8); 
 OSIntEnter();

   OSTimeTick();  
   //  rI_ISPC=BIT_TIMER5;
Uart_Printf("ok");
    OSIntExit();
  ////  rI_ISPC |= (1 << 8); 



// return ;
}