main.c

关于PWM单片机编程的源程序

#include <LPC21XX.H>
void pwm_init(void);
int main(void)
{
	unsigned int val;
	pwm_init();
	ADCR   = 0x00250601;    // adc 
	ADCR  |= 0x01000000;    
	while(1)				
	{       
		while (((val=ADDR) & 0x80000000) == 0);  	
		val = ((val >> 9) & 0x00FF);  			 
		PWMMR1 = 0x00000000+val;				
		PWMMR2 = 0x000000FF-val;
		PWMLER = 0x00000006;					
	}
}

void pwm_init(void)
{
	PINSEL0 |= 0x00028000;		//pwm
	PWMPR 	 = 0x00000001;	
	PWMPCR = 0x0000404;		
	PWMMCR = 0x00000003;	
	PWMMR0 = 0x000000FF;
	PWMMR1 = 0x00000080;	
	PWMMR2 = 0x00000080;	
	PWMLER = 0x00000007;	
	PWMTCR = 0x00000009;	
}