STM32F103ret6 time4 CCR1和CCR2无法输出PWM但是CCR3和CCR4可以，怀疑和复用I^2C复用有关请求大神解答，附代码，控制舵机

feelfeel

#include "stm32f10x.h"
//#include "bsp_pwm_output.h"
//#include "bsp_pwm2_output.h"
#include "bsp_pwm4_output.h"
#include "bsp_SysTick.h"

int main(void)
{       
       
//        TIM2_PWM_Init();
       
//        TIM3_PWM_Init();
       
        TIM4_PWM_Init();
       

while(1)
{       
       
       
                TIM4->CCR1=1500;
                        delay_ms(250);
                TIM4->CCR1=500;
                        delay_ms(250);
                TIM4->CCR1=1500;
                        delay_ms(250);
                TIM4->CCR1=2500;
                        delay_ms(250);
        while(1)         
        {}
}
}



/*********************************************END OF FILE**********************/

#include "bsp_pwm4_output.h"

static void TIM4_GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

        /* éèÖÃTIM2CLK Îa 72MHZ */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

  /* GPIOA and GPIOB clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);

  /*GPIOA Configuration: TIM2 channel 1 and 2 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_8|GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;                  
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

}


static void TIM4_Mode_Config(void)
{
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;

        u16 CCR1_Val=1500;
        u16 CCR2_Val=1500;
        u16 CCR3_Val=1500;
        u16 CCR4_Val=1500;  
  /* Time base configuration */                 
  TIM_TimeBaseStructure.TIM_Period =14999;      
  TIM_TimeBaseStructure.TIM_Prescaler = 71;          
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;       
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: Channel1 */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;            
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;       
  TIM_OCInitStructure.TIM_Pulse = CCR1_Val;          
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  
  TIM_OC1Init(TIM4, &TIM_OCInitStructure);       
  TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
        /* PWM1 Mode configuration: Channel2 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR2_Val;         
  TIM_OC2Init(TIM4, &TIM_OCInitStructure);          
  TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel3 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR3_Val;       
  TIM_OC3Init(TIM4, &TIM_OCInitStructure);         
  TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel4 */
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = CCR4_Val;       
  TIM_OC4Init(TIM4, &TIM_OCInitStructure);       
  TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);
  /* TIM3 enable counter */
  TIM_Cmd(TIM4, ENABLE);               
}


extern void TIM4_PWM_Init(void)
{
        TIM4_GPIO_Config();
        TIM4_Mode_Config();       
}

/*********************************************END OF FILE**********************/

feelfeel

一定需要用到这两个通道  谢谢了