main.c

用凌阳单片机软件产生的PWM

#include "SPCE061A.h"

unsigned int PWM_Date[24]={6,12,18,24,30,36,42,48,54,60,66,72,78,84,90,96,102,108,114,120,126,132,138,144};

unsigned int PWM_Voltage_Flag,PWM_Duty,num=0;
unsigned int num_sige=1;
 int main(void)
{      
		*P_IOB_Data=0xff;			
		
		*P_IOB_Dir=0xff	;			
		*P_IOB_Attrib=0xff;               //B口初始化
	__asm("irq off");
	
	*P_INT_Ctrl=C_IRQ2_TMB;

	*P_TimerB_Ctrl = 0x01;
	PWM_Voltage_Flag = 1;
//	PWM_Duty = 138;
	*P_TimerB_Data = 65535 -  PWM_Date[num];//舵机在中间位置定时器B的预制寄存器初值
   		__asm("irq on");
   		while(1)
   			*P_Watchdog_Clear=0x0001;
}


void IRQ2(void)__attribute__((ISR));
void IRQ2(void)
{
	if (PWM_Voltage_Flag == 1){
		PWM_Voltage_Flag = 0;
		*P_TimerB_Data = 65535 - (1920 -  PWM_Date[num]);
		*P_IOB_Data &= 0xfffe;}
	else{
		PWM_Voltage_Flag = 1;
		*P_TimerB_Data = 65535 - PWM_Date[num];
		*P_IOB_Data |= 0x0001;}
   if(num_sige==1)
   {  num+=1;
     if(num==23)
     	num_sige=0;
     
   }
   if(num_sige==0)
   {	 num-=1;
    if(num==0)
    	 num_sige=1;
   }		
	*P_INT_Clear = 0x0400;
}