tim2输出pwm问题

18320378056

tim2 无法输出pwm， 用仿真看波形，一直为高电平，下面是源码
#include "tim.h"
static void TIMx_GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

          RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); //¿aÆôGPIOAμÄê±Öó
          

          RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);  //¿aÆôtim2μÄê±Öó
       
          GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
          GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1;
          GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
          
          GPIO_Init(GPIOA,&GPIO_InitStructure);           //3õê¼»ˉGPIOA
         
}


static void TIMx_Mode_Config(void)
{
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;

        /* PWMDÅoÅμçƽìø±äÖμ */
        u16 CCR1_Val = 500;        
        u16 CCR2_Val = 375;



  /* Time base configuration */                 
  TIM_TimeBaseStructure.TIM_Period = 999;       //챶¨ê±Æ÷′ó0¼Æêyμ½999￡¬¼′Îa1000′Î￡¬Îaò»¸ö¶¨ê±ÖüÆú
  TIM_TimeBaseStructure.TIM_Prescaler = 0;            //éèÖÃÔ¤·ÖÆμ￡o2»Ô¤·ÖÆμ￡¬¼′Îa72MHz
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;        //éèÖÃê±Öó·ÖÆμÏμêy￡o2»·ÖÆμ(ÕaàïóÃ2»μ½)
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //ÏòéϼÆêyÄ￡ê½
  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;            //ÅäÖÃÎaPWMÄ￡ê½1
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;       
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;           //éèÖÃìø±äÖμ￡¬μ±¼ÆêyÆ÷¼Æêyμ½Õa¸öÖμê±￡¬μçƽ·￠éúìø±ä
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  //챶¨ê±Æ÷¼ÆêyÖμD¡óúCCR1_Valê±Îa¸ßμçƽ
  TIM_OC1Init(TIM2, &TIM_OCInitStructure);         //ê1Äüí¨μà1
  TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel2 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;          //éèÖÃí¨μà2μÄμçƽìø±äÖμ￡¬êä3öáííaò»¸öÕ¼¿Õ±èμ&#196WM
  TIM_OC2Init(TIM2, &TIM_OCInitStructure);          //ê1Äüí¨μà2
  TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel3 */


  /* PWM1 Mode configuration: Channel4 */
  TIM_ARRPreloadConfig(TIM2, ENABLE);                         // ê1ÄüTIM3ÖØÔؼÄ′æÆ÷ARR

  /* TIM3 enable counter */
  TIM_Cmd(TIM2, ENABLE);                   //ê1Äü¶¨ê±Æ÷3       
}


void TIMx_PWM_Init(void)
{
        TIMx_GPIO_Config();
        TIMx_Mode_Config();       
}

fire

参考配套的历程和教程

18320378056

fire 发表于 2016-12-4 16:41
参考配套的历程和教程

火哥，我就是把例程的tim3改成tim2 ，把tim3的3,4 通道去掉而已，还有一个问题，printf重定义到usart1里，我在主函数一调用printf，代码就运行不下去，c8t6的usart1引脚也和指南者的一样啊