pwm_2.c

非常实用的韩国dsp2407源代码

/* -------------------------------------------------------------------- */
/*	                 PWM test code for my2406/2407 board        		*/
/*																		*/
/*										     Copyleft(^^) Do-Yoon Kim   */
/*											 PWM_2.c	ver 2.0			*/
/*														2002.7.10	    */
/* EVA 葛碘俊辑 父甸绢 尘 荐 乐绰 PWM绰 6俺捞促. 捞锅 抗力俊辑绰        */
/* 6俺 葛滴甫 阿阿 促弗 掂萍甫 啊柳 PWM栏肺 父甸绢焊磊.                 */
/* PWM 林颇荐绰 30KHz, 掂萍绰 阿阿 20% 40% 60%栏肺 父甸绢焊磊.          */
/* CON1狼 1,3,5,7,9,11锅捞 PWM1~PWM6捞 楷搬登绢 乐绰 巧捞促.            */
/* 坷角肺胶内橇啊 乐促搁 流立 犬牢秦 焊档废 茄促.                       */
/* -------------------------------------------------------------------- */

#include <util.h>
#include <SCI.h>

                                                 
#define PWM_PERIOD	30000UL     //30KHz

void bad_trap( void )
{
	while(1) ;
}  
     
         
void main( void )
{		                
	UINT k,j;
	
	DSPInit(PLLx4);
	
	EVA_ENABLE; // PWM1,2绰 EVA俊 加秦乐栏骨肺 EVA 葛碘阑 劝己拳
	T1DISABLE;  // 老窜 timer甫 厚劝己拳
	
	//----------------------------------------------------------------------
	// 1. setting PWM1 and 2, PWM 免仿 淬寸 巧阑 PWM 扁瓷栏肺 汲沥
	SET_PWM1;
	SET_PWM2;
	SET_PWM3;
	SET_PWM4;
	SET_PWM5;
	SET_PWM6;
	
	// 2. Setting Timer1, PWM 林扁甫 搬沥茄促.
	T1PR = (CPU_clk()/PWM_PERIOD);  
	    //泅犁 CPU 悼累 林颇荐俊辑 荤侩窍绊磊窍绰 PWM 林颇荐甫 唱穿绢霖 蔼阑
	    // 鸥捞赣 悼累 林颇荐肺 汲沥窍搁 等促.
	        
	                                               
	// 3. ACTRA = Compare Action Control Register A
	ACTRA = 0x0999;
	    // bit3,2 are for PWM2 action mode : 10-active high, 01-active low
	  	// bit1,0 are for PWM1 action mode : 10-active high, 01-active low
        // 抛胶飘甫 困秦 PWM2绰 active high肺, PWM1篮 active low肺 汲沥
	
	// 4. PWM duty 汲沥
	CMPR1 = (unsigned int)(T1PR*0.2);		// CMPR1 -> PWM1 & PWM2	
	CMPR2 = (unsigned int)(T1PR*0.4);		// CMPR1 -> PWM3 & PWM4
	CMPR3 = (unsigned int)(T1PR*0.6);		// CMPR1 -> PWM4 & PWM6                            	
	
	// 5. COMCONA = Compare Control Register A
	COMCONA = 0xC200;	           
	    //  bit 15 is for Compare Enable 	   
	    //  bit 9  is for Compare Output enable     	   	                                      	
                                                   
    // 6. 鸥捞赣 悼累 葛靛 汲沥                                               
	T1CON = 0xD040;  
	    //	bit 12,11 are for Count Mode Selection:10-continuous Up count mode
		//  bit 10,9,8 are for Input Clock Prescaler 000 - 	x/1
		//  bit 6 is for Timer Enable          
    //-------------------------------------------------------------------------
	
    SET_PC_OUT(BIT0);				// for debugging    
    
	while(1)
	{
        for(j=0;j<65000;j++)
		{
			k++;
		}				     
		TOGGLE(PORTC,BIT0);
	}
}