pwm.zip_msp430f149pwm代码

#include <msp430x14x.h> #define CPU_F ((double)8000000) #define delay_us(x) __delay_cycles((long)(CPU_F*(double)x/1000000.0)) #define delay_ms(x) __delay_cycles((long)(CPU_F*(double)x/1000.0)) void main(void) { WDTCTL = WDTPW +WDTHOLD; unsigned int temp1,temp2; P5DIR = 0XFF; P5OUT = 0XFF; TACTL = TASSEL0 + TACLR; // ACLK, 清除 TAR CCR0 = 512-1; // PWM周期 CCTL1 = OUTMOD_7; CCR1 = 2; //占空比 384/512=0.75 CCTL2 = OUTMOD_7; CCR2 = 128; //占空比128/512=0.25 P1DIR |= 0x04; // P1.2 输出 P1SEL |= 0x04; // P1.2 TA1 P2DIR |= 0x01; // P2.0 输出 P2SEL |= 0x01; // P2.0 TA2 TACTL |= MC0; // Timer_A 增计数模式 for (;;) { temp1=P1IN & 0X0F; //读取按键IO口电平 if(temp1 !=0X0F) //判断是否有按键被按下 { delay_ms(100); //按键延时防抖动 temp2=P1IN&0X0F; if(temp2==temp1) { while(temp2!=0X0F) //等待松开按键 temp2=P1IN&0X0F; { switch(temp1) { case 0x0E: CCR1+=50; break; case 0x0d: CCR1-=50; break; case 0x0b: P5OUT=0XFD; break; case 0x07: P5OUT=0XFE; break; } } } } } }