STM32

求助，我想用用两个定时器TIM3和TIM5输出两路PWM，结果为什么只能用一个定时器的PWM呢？

2019-07-21 05:21发布

站内问答 / STM32/STM8
17036 2 1526
代码是在STM32CubeMX生成的代码基础上改的。TIM3用了PWM_CH3和PWM_CH4，TIM5用了PWM_CH4，结果两个定时器不能同时输出PWM。初始化函数MX_TIM3_Init() 和 MX_TIM5_Init()，根据规律，先调用的函数其对应定时器PWM就能用。后调用的不能用。。两个初始化是一模一样的。。。郁闷了，求帮忙看下。




#include "sys.h"
#include "includes.h"


static void MX_TIM3_Init(void);
static void MX_TIM5_Init(void);
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim);
static void MX_GPIO_Init(void);
void SystemClock_Config(void);
void TIM_SetTIM3Compare4(unsigned int compare);
void TIM_SetTIM5Compare4(unsigned int compare);
void delay_ms(unsigned int count);


int main(void)
{
        unsigned int led0pwmval = 0;
        unsigned char dir = 1;

  HAL_Init();                                                     //初始化HAL库   
       
        SystemClock_Config();
       
        MX_GPIO_Init();
       
        MX_TIM3_Init();
        MX_TIM5_Init();       
       
        while(1)
        {
                delay_ms(1);
                if(dir)led0pwmval+=3;                                //dir==1 led0pwmval递增
                else led0pwmval--;                                    //dir==0 led0pwmval递减
                if(led0pwmval>500)dir=0;                        //led0pwmval到达300后，方向为递减
                if(led0pwmval==0)dir=1;                            //led0pwmval递减到0后，方向改为递增
                TIM_SetTIM3Compare4(led0pwmval);        //修改比较值，修改占空比               
                TIM_SetTIM5Compare4(led0pwmval);        //修改比较值，修改占空比       

       
        }
}





















void delay_ms(unsigned int count)
{
        unsigned int temp = 0;
       
        for(;count > 0;count--)
                for(temp=0;temp<30000;temp++);
       
}

void TIM_SetTIM3Compare4(unsigned int compare)
{
        TIM3->CCR4=compare;
        TIM3->CCR3=(500-compare);
}


void TIM_SetTIM5Compare4(unsigned int compare)
{
        TIM5->CCR4=compare;
}


void _Error_Handler(char *file, int line)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  while(1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}
/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{

  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;

    /**Initializes the CPU, AHB and APB busses clocks
    */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = 16;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL16;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Initializes the CPU, AHB and APB busses clocks
    */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

    /**Configure the Systick interrupt time
    */
  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

    /**Configure the Systick
    */
  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

static void MX_GPIO_Init(void)
{
  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOB_CLK_ENABLE();
        __HAL_RCC_GPIOA_CLK_ENABLE();
}


void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
  GPIO_InitTypeDef GPIO_InitStruct;
  if(htim->Instance==TIM3)
  {
    /**TIM3 GPIO Configuration   
    PB1     ------> TIM3_CH4
    */
                __HAL_RCC_TIM3_CLK_ENABLE();                        //使能定时器3
    GPIO_InitStruct.Pin = GPIO_PIN_1;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
               
                GPIO_InitStruct.Pin = GPIO_PIN_0;
                HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
  }
        else if(htim->Instance==TIM5)
        {
    /**TIM5 GPIO Configuration   
    PA3     ------> TIM5_CH4
    */
                __HAL_RCC_TIM5_CLK_ENABLE();                        //使能定时器5
    GPIO_InitStruct.Pin = GPIO_PIN_3;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);               
        }
}



/* TIM3 init function */
static void MX_TIM3_Init(void)
{
        TIM_ClockConfigTypeDef sClockSourceConfig;
  TIM_MasterConfigTypeDef sMasterConfig;
  TIM_OC_InitTypeDef sConfigOC;
        TIM_HandleTypeDef htim3;

  htim3.Instance = TIM3;
  htim3.Init.Prescaler = (64000000/1000000 - 1);        //定时器分频
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 1000;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
       
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 500;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_LOW;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_4) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
       
  if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }       

        HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_4);//开启PWM通道4
        HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_3);//开启PWM通道3
}





/* TIM4 init function */
static void MX_TIM5_Init(void)
{
        TIM_ClockConfigTypeDef sClockSourceConfig;
  TIM_MasterConfigTypeDef sMasterConfig;
  TIM_OC_InitTypeDef sConfigOC;
        TIM_HandleTypeDef htim5;

  htim5.Instance = TIM5;
  htim5.Init.Prescaler = (64000000/1000000 - 1);        //定时器分频
  htim5.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim5.Init.Period = 1000;
  htim5.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  if (HAL_TIM_PWM_Init(&htim5) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
       
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim5, &sClockSourceConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim5, &sMasterConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 500;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_LOW;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_PWM_ConfigChannel(&htim5, &sConfigOC, TIM_CHANNEL_4) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }
  HAL_TIM_PWM_Start(&htim5,TIM_CHANNEL_4);//开启PWM通道4
}

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2条回答
CeleronN3150
2019-07-21 08:09
 精彩回答 2  元偷偷看……0人看过

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