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标题: coldfire求帮忙看下我的PWM初始化 [打印本页]

作者: 9__2__9 时间: 2014-5-9 19:50
标题: coldfire求帮忙看下我的PWM初始化
我的pwm初始话对应输出50hz的pwm波，不是固定的，是在不停的跳变，

void PWM_init(void)
{

MCF_GPIO_PTCPAR=MCF_GPIO_PTCPAR_DTIN0_PWM0
   |MCF_GPIO_PTCPAR_DTIN1_PWM2
   |MCF_GPIO_PTCPAR_DTIN2_PWM4
   |MCF_GPIO_PTCPAR_DTIN3_PWM6;

MCF_GPIO_PTAPAR=MCF_GPIO_PTAPAR_ICOC0_PWM1
   |MCF_GPIO_PTAPAR_ICOC1_PWM3
   |MCF_GPIO_PTAPAR_ICOC2_PWM5
   |MCF_GPIO_PTAPAR_ICOC3_PWM7;
   MCF_PWM_PWMPOL=0xff;
   MCF_PWM_PWMCLK=0xff;
   MCF_PWM_PWMPRCLK=MCF_PWM_PWMPRCLK_PCKA(3)
                  |MCF_PWM_PWMPRCLK_PCKB(3); //分频系数4总线分频为10Mhz
   MCF_PWM_PWMCAE=0;//左对齐
   MCF_PWM_PWMCTL|=MCF_PWM_PWMCTL_CON01;    //级联01
   MCF_PWM_PWMSCLA=5;
   MCF_PWM_PWMSCLB=5;                         //SA，SB为1Mhz

   //MCF_PWM_PWMPER(0)=20000/256;
   //MCF_PWM_PWMPER(1)=20000%256;
   MCF_PWM_PWMPER2=100;
   MCF_PWM_PWMPER3=100;
   MCF_PWM_PWMPER4=100;
   MCF_PWM_PWMPER5=100;
   MCF_PWM_PWMPER6=100;
   MCF_PWM_PWMPER7=100;          //10Khz


   MY_PWMPER01=20000;             //50hz
   MY_PWMDTY01=10000;


   //MCF_PWM_PWMDTY(0)=1470/256;
   //MCF_PWM_PWMDTY(1)=1470%256;
   MCF_PWM_PWMDTY2=0;
   MCF_PWM_PWMDTY3=0;
   MCF_PWM_PWMDTY4=0;
   MCF_PWM_PWMDTY5=0;
   MCF_PWM_PWMDTY6=0;
   MCF_PWM_PWMDTY7=0;






   MCF_PWM_PWME=0xf3;


}

头文件中加
#define MY_PWMPER01 (*(vuint16 *)(0x401B0014))
#define MY_PWMPER23 (*(vuint16 *)(0x401B0016))
#define MY_PWMPER45 (*(vuint16 *)(0x401B0018))
#define MY_PWMPER67 (*(vuint16 *)(0x401B001A))

#define MY_PWMDTY01 (*(vuint16 *)(0x401B001C))
#define MY_PWMDTY23 (*(vuint16 *)(0x401B001E))
#define MY_PWMDTY45 (*(vuint16 *)(0x401B0020))
#define MY_PWMDTY67 (*(vuint16 *)(0x401B0022))

输出到舵机会使舵机不停的抖，示波器上看到的是一个抖动的方波,求大神帮忙看下

作者: chengxinshuaish 时间: 2014-5-13 09:34
你用的是哪一款芯片呢？

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