pwm.c

可以实现44B0的底层所有通信

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

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

extern int  Uart_GetIntNum(void);
void SetBeepPwm(unsigned short Freq, unsigned char HiRatio);
void StopBeepPwm(void);
void __irq TIMER0_int(void);
 //volatile int isWdtInt;
unsigned int pwmcnt=0;

/****************************************
 *	PWM (BEEP) test		*
 ****************************************/
void Test_Pwm(void)
{
    int  beginf, endf;
    int  i, j;
    Uart_Printf("[pwm (beep)  Test]\n");
    /*Uart_Printf("input begin f= (%d--%d): ", MinBeepFreq,MaxBeepFreq);
    beginf = Uart_GetIntNum();
     while (beginf<MinBeepFreq ||beginf>=MaxBeepFreq)
    {
     Uart_Printf("ERROR !!!!  input begin f= (%d--%d): ", MinBeepFreq,MaxBeepFreq);
     beginf = Uart_GetIntNum();
    }
    Uart_Printf("input end f= (%d--%d): ", MinBeepFreq,MaxBeepFreq);
    endf = Uart_GetIntNum();
     while (endf<MinBeepFreq ||endf>=MaxBeepFreq ||endf < beginf )
    {
     Uart_Printf("ERROR !!!!  input end f> beginf   (%d--%d) : ",MinBeepFreq,MaxBeepFreq);
     endf = Uart_GetIntNum();
    }*///edit by chenzhi
	beginf=2700;
	endf=3000;
    Uart_Printf("beginf= %d ; endf=%d : ", beginf, endf );
     	 
    rINTCON = 5; //允许IRQ使用非向量模式，允许IRQ中断
    rINTMOD = 0; //中断以IRQ模式来处理	
    rINTMSK=~(BIT_GLOBAL|BIT_TIMER2);//开放TIMER2中断
    pISR_TIMER0= (unsigned  int)TIMER0_int;   //(unsigned)TIMER0中断函数入口地址
    rPDATE = 0x157;				//Beep = 10
    rPCONE = 0x55ab;      // tout0				
    rPUPE  = 0xff;		  //禁止上拉电阻连接到对应脚

  	for (i=beginf; i<endf; i+=50)
    {
        pwmcnt=0;
		SetBeepPwm( i, 50);
		for (pwmcnt=0,j=0; pwmcnt<5;)
        {
        	Uart_Printf("j=%d\n",j++);
        }
	/* for (j=0; j<5;)
	{ 
	  while (READ_COUNT2>=1)
	  {
          
	   }
	  j++;
	 } */

    }
   	StopBeepPwm();
}

void SetBeepPwm(unsigned short Freq, unsigned char HiRatio)
{
	if(Freq>MaxBeepFreq)
		Freq = MaxBeepFreq;
	if(HiRatio>100)
		HiRatio = 100;	
	rTCON  	&= 0xfffffff0;					// clear manual update bit, stop Timer0
	rTCFG0 	&= 0xffffff00;					// set Timer 0&1 prescaler 0
	rTCFG1 	&= 0xfffffff0;					// set Timer 0 MUX 1/16  edit by chenzhi
	rTCFG1  |= 0x00000003;						//edit by chenzhi
	rTCNTB0	 = MCLK/(Freq*16);				//if set inverter off, when TCNT0<=TCMP0, TOUT is high, TCNT0>TCMP0, TOUT is low
	rTCMPB0  = (rTCNTB0*(100-HiRatio))/100;	//if set inverter on,  when TCNT0<=TCMP0, TOUT is low,  TCNT0>TCMP0, TOUT is high
	rTCON	|= 0x00000002;					// manual update
	rTCON	&= 0xfffffff0;	  				// clear manal update bit
	rTCON   |= 0x0000000d;					// auto reload, inverter on, start Timer 0
}

void StopBeepPwm(void)
{
	rTCON &= ~0x0001;			//stop timer0
}

void __irq TIMER0_int(void)
{
 rI_ISPC=BIT_TIMER0;
 pwmcnt++;
 return ;
}