pwm_1.c

非常实用的韩国dsp2407源代码

/* ------------------------------------------------------------------------ */
/*	                 PWM test code for my2406/2407 board        			*/
/*																			*/
/*										     Copyleft(^^) Do-Yoon Kim       */
/*											 PWM_1.c		ver 2.0			*/
/*															2002.7.10	    */
/* 魂诀眉俊辑 腹捞 荤侩窍绰 30KHz 林扁狼 PWM 颇屈阑 父甸绢 焊磊.            */
/* PWM1篮 positive duty啊 10%牢 颇屈阑, PWM2绰 捞 馆措 颇屈捞 唱坷档废 窍磊 */
/* CON1狼 1, 3锅捞 PWM1, PWM2啊 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;
	
	// 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 = 0x0009;
	    // 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*0.1);		// CMPR1 -> PWM1 & PWM2
	    //  10% duty甫 爱绰 PWM 颇屈阑 父甸绢 夯促.                            	
	
	// 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);     // 悼累 犬牢 侩栏肺 LED 配臂
	}             
}