#include "2407A.h"  

void initial();                                     /*初始化子程序 */ 
void timer3initial();                               /*定時(shí)器3初始化子程序 */
void pwminitial();                                  /*PWM初始化子程序 */

unsigned int CMPR1;	        		    /*設(shè)置PWM周期變量 */
unsigned int T1PER;			            /*設(shè)置Timer1周期變量 */

void inline disable()
{
	asm(" SETC INTM");	                    /*禁止所有中斷*/
}

void inline enable()
{
	asm(" CLRC INTM");	                    /*開放所有中斷 */
}


void initial()
{
	asm(" SETC SXM");                           /*抑制符號(hào)位擴(kuò)展 */ 
	asm(" SETC OVM");                           /*根據(jù)遇到溢出的情況，累加器被設(shè)置為它的最大正值或負(fù)值 */
	asm(" SETC CNF");                           /*B0被設(shè)置為程序存儲(chǔ)空間 */

	*SCSR1=0X87FE;			            /*clock=fin;使能ADC、SCI、SPI、CAN、EVA、EVB模塊*/	
	*WDCR=0X0E8;                                /*不使能看門狗*/
	
	*IMR=0X0002;				    /*允許INT2中斷*/
	*IFR=0X0FFFF;				    /*清除全部中斷標(biāo)志*/
	WSGR=0X00;				    /*禁止所有等待狀態(tài)*/
	
	*MCRA=*MCRA|0X0040;			    /*IOPA6端口設(shè)置為基本功能，PWM1 */
	*MCRC=*MCRC&0X0FF00;                        /*IOPE端口設(shè)置為一般的I/O功能 */

        *PADATDIR=*PADATDIR|0X4000;                 /*IOPA6設(shè)置為輸出方式*/ 
	*PEDATDIR=*PEDATDIR|0X0000;		    /*IOPE端口設(shè)置為輸入方式*/ 
}

void  timer3initial()
{
	*EVBIMRA=*EVBIMRA|0X0080;	            /*允許定時(shí)器3的周期中斷 */
	*EVBIFRA=*EVBIFRA|0Xffff;	            /*清除定時(shí)器3周期中斷標(biāo)志*/
	*T3CON=0X170C;			            /*Timer3為連續(xù)增計(jì)數(shù)模式，預(yù)分頻值為128，使用內(nèi)部時(shí)鐘*/
	*T3PER=0X0c350;			            /*Timer3的周期寄存器的值根據(jù)0.64s延時(shí)和預(yù)分頻值確定，改狀態(tài)*/
	*T3CNT=0X0000;			            /*Timer3的計(jì)數(shù)器清零*/
}

void  pwminitial()
{
        *ACTRA=0X0002;                              /*PWM1高有效*/   
        *DBTCONA=0X0000;                            /*不使能死區(qū)控制*/
        *CMPR1=CMPR1;                               /*設(shè)置CMPR1,以確定輸出占空比*/                                            
        *T1PER=T1PER;                               /*設(shè)置Timer1周期寄存器，以確定PWM周期*/
        *COMCONA=0X8200;                            /*使能比較操作*/
        *T1CON=0X100C;                              /*Timer1為連續(xù)增計(jì)數(shù)模式，預(yù)分頻值為1，使用內(nèi)部時(shí)鐘*/
}

void interrupt T3_INT()
{
	unsigned int flag;
        unsigned int key;

	flag=*EVBIFRA&0X0080;
	if(flag!=0X0080)
	{
                enable();                           /*開中斷*/
                return;                             /*中斷返回 */ 
        }			
		
        *T3CNT=0X0000;     		            /*Timer3計(jì)數(shù)器清零*/
	*EVBIFRA=*EVBIFRA|0X0080;       	    /*清除定時(shí)器3周期中斷標(biāo)志 */

	key=*PEDATDIR&0X00FF;
	switch(key)
	{	
	        case 1:                             //do  00000001
			  CMPR1=0X4A9C;                   
			  T1PER=0X9538;             /*F=261.5Hz,T=3.82ms */
                          pwminitial();             /*PWM輸出初始化 */
                          *T1CON=*T1CON|0X0040;     /*啟動(dòng)Timer1 */ 
			  break;
		case 2:	                            //re  00000010
			  CMPR1=0X429A;                   
			  T1PER=0X8534;             /*F=293.4Hz,T=3.41ms */
                          pwminitial();             
                          *T1CON=*T1CON|0X0040;    
			  break;
		case 4:	                            //mi  00000100
			  CMPR1=0X3B60;                   
			  T1PER=0X76C0;             /*F=328.9Hz,T=3.04ms */
                          pwminitial();            
                          *T1CON=*T1CON|0X0040;     
			  break;
		case 8:                             //fa  00001000
			  CMPR1=0X37DC;                   
			  T1PER=0X6FB8;             /*F=349.2Hz,T=2.86ms*/
                          pwminitial();             
                          *T1CON=*T1CON|0X0040;     
			  break;
		case 16:                            //so  00010000
			  CMPR1=0X319C;                   
			  T1PER=0X6338;             /*F=393Hz,T=2.54ms*/
                          pwminitial();             
                          *T1CON=*T1CON|0X0040;     
			  break;
		case 32:                            //la  00100000
			  CMPR1=0X2C56;                   
			  T1PER=0X58AC;             /*F=440Hz,T=2.27ms*/
                          pwminitial();             
                          *T1CON=*T1CON|0X0040;    
			  break;
		case 64:                            //si  01000000
			  CMPR1=0X37A6;                   
			  T1PER=0X4F4C;             /*F=492.1Hz,T=2.03ms */
                          pwminitial();             
                          *T1CON=*T1CON|0X0040;     
			  break;
		case 128:                           //!do 10000000
			  CMPR1=0X251C;                   
			  T1PER=0X4A38;             /*F=525.2Hz,T=1.9ms*/
                          pwminitial();             
                          *T1CON=*T1CON|0X0040;     
			  break;	
	}
	enable();				    /*開中斷*/
	return;					    /*中斷返回 */                   
}

void interrupt nothing( ) 
{
 	enable();
 	return;
}
                     
main()
{
	disable();
	initial();
	timer3int();
	enable();
	*T3CON=*T3CON|0X0040;			    /*啟動(dòng)Timer3*/
	
	while(1)
	{
	asm(" nop"); 
	}
}