求助Timer3 CH2 PWM输出问题

haoyue1995 · 发表于 2022-12-7 21:29:29

我用IAR写的PWM输出程序，正常应该看到PB5的小灯亮灭交替，结果一直是常亮状态，搜了一圈没搞明白怎么回事
基本定时功能和中断倒是正常，PWM输出无作用

//Main.c
/* Includes ------------------------------------------------------------------*/
#include "main.h"
void SystemClock_Config(void);
void LED_Init(void);
#define LED1_ON HAL_GPIO_WritePin(GPIOB,GPIO_PIN_5, GPIO_PIN_RESET)
#define LED1_OFF HAL_GPIO_WritePin(GPIOB,GPIO_PIN_5, GPIO_PIN_SET)
#define LED1_Toggle HAL_GPIO_TogglePin(GPIOB,GPIO_PIN_5)
#define LED2_ON HAL_GPIO_WritePin(GPIOE,GPIO_PIN_5, GPIO_PIN_RESET)
#define LED2_OFF HAL_GPIO_WritePin(GPIOE,GPIO_PIN_5, GPIO_PIN_SET)
#define LED2_Toggle HAL_GPIO_TogglePin(GPIOE,GPIO_PIN_5)
void Tim3_Init(void);
void Tim3B_Init(void);
TIM_HandleTypeDef TIM3_Handler; //定时器句柄
TIM_OC_InitTypeDef TIM3_CH2Handler; //定时器3通道2句柄
uint ret;
int compare=0;
int main(void)
{
HAL_Init();
SystemClock_Config();
// LED_Init();
// LED1_OFF;
// LED2_OFF;
//Tim3B_Init();
Tim3_Init();
while (1)
{
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 72000000
* HCLK(Hz) = 72000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* HSE PREDIV1 = 1
* PLLMUL = 9
* Flash Latency(WS) = 2
* [url=home.php?mod=space&uid=271674]@param[/url] None
* @retval None
*/
void SystemClock_Config(void)
{
RCC_ClkInitTypeDef clkinitstruct = {0};
RCC_OscInitTypeDef oscinitstruct = {0};
/* Enable HSE Oscillator and activate PLL with HSE as source */
oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
oscinitstruct.HSEState = RCC_HSE_ON;
oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
oscinitstruct.PLL.PLLState = RCC_PLL_ON;
oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
{
/* Initialization Error */
while(1);
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
{
/* Initialization Error */
while(1);
}
}
void LED_Init(void)
{
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOE_CLK_ENABLE();
GPIO_InitTypeDef GPIO_Init_Struct;
GPIO_Init_Struct.Pin=GPIO_PIN_5;
GPIO_Init_Struct.Mode=GPIO_MODE_OUTPUT_PP;
GPIO_Init_Struct.Pull=GPIO_PULLUP;
GPIO_Init_Struct.Speed=GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOB, &GPIO_Init_Struct);
HAL_GPIO_Init(GPIOE, &GPIO_Init_Struct);
}
void Tim3_Init(void)
{
TIM3_Handler.Instance=TIM3; //定时器3
TIM3_Handler.Init.Prescaler=(72-1); //定时器分频
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;//向上计数模式
TIM3_Handler.Init.Period=(50000-1); //自动重装载值
TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
TIM3_Handler.Init.RepetitionCounter = 0;
TIM3_Handler.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
HAL_TIM_PWM_Init(&TIM3_Handler); //初始化PWM
TIM3_CH2Handler.OCMode=TIM_OCMODE_PWM1; //模式选择PWM1
TIM3_CH2Handler.Pulse=(50000-1)/2; //设置比较值,此值用来确定占空比，默认比较值为自动重装载值的一半,即占空比为50%
TIM3_CH2Handler.OCPolarity=TIM_OCPOLARITY_LOW; //输出比较极性为低
TIM3_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;
TIM3_CH2Handler.OCNPolarity = TIM_OCNPOLARITY_HIGH;
TIM3_CH2Handler.OCNIdleState = TIM_OCNIDLESTATE_RESET;
HAL_TIM_PWM_ConfigChannel(&TIM3_Handler,&TIM3_CH2Handler,TIM_CHANNEL_2);//配置TIM3通道2
HAL_TIM_PWM_Start(&TIM3_Handler,TIM_CHANNEL_2);//开启PWM通道2
}
void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
GPIO_InitTypeDef GPIO_Initure;
if(htim->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_ENABLE(); //使能定时器3
__HAL_RCC_GPIOB_CLK_ENABLE(); //开启GPIOB时钟
__HAL_AFIO_REMAP_TIM3_PARTIAL(); //TIM3通道引脚部分重映射使能
GPIO_Initure.Pin=GPIO_PIN_5; //PB5
GPIO_Initure.Mode=GPIO_MODE_AF_PP; //复用推挽输出
//GPIO_Initure.Pull=GPIO_PULLUP; //上拉
GPIO_Initure.Speed=GPIO_SPEED_FREQ_HIGH;//高速
HAL_GPIO_Init(GPIOB,&GPIO_Initure);
}
}
void Tim3B_Init(void)
{
TIM3_Handler.Instance=TIM3; //定时器3
TIM3_Handler.Init.Prescaler=(72-1)*100; //定时器分频
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;//向上计数模式
TIM3_Handler.Init.Period=(50000-1); //自动重装载值
TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&TIM3_Handler); //初始化PWM
HAL_TIM_Base_Start_IT(&TIM3_Handler); //使能定时器3和定时器3更新中断：TIM_IT_UPDATE
}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
{
if(htim->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_ENABLE(); //使能TIM3时钟
HAL_NVIC_SetPriority(TIM3_IRQn,1,3); //设置中断优先级，抢占优先级1，子优先级3
HAL_NVIC_EnableIRQ(TIM3_IRQn); //开启ITM3中断
}
}
//定时器3中断服务函数
void TIM3_IRQHandler(void)
{
HAL_TIM_IRQHandler(&TIM3_Handler);
}
//回调函数，定时器中断服务函数调用
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim==(&TIM3_Handler))
{
LED1_Toggle; //LED1反转
}
}

复制代码

haoyue1995 · 发表于 2022-12-7 21:29:30

本帖最后由 haoyue1995 于 2022-12-8 13:02 编辑

更新一下，我好像发现问题所在了
我把例程里串口初始化屏蔽了，例程就成我现在程序的样子，PB5常亮PWM不输出
我把例程里串口初始化解除屏蔽了，例程就能够正常输出PWM了，PB5亮灭发生了变化然后发现问题出在语句__HAL_RCC_AFIO_CLK_ENABLE();上，而且这个语句必须在PWM输出引脚重映射语句前执行，否则就不会执行PWM输出引脚重映射，PWM不会才PB5输出。

现在在我的程序中单独执行PWM输出，PB5就可以正常亮灭了

//Main.c
/* Includes ------------------------------------------------------------------*/
#include "main.h"
void SystemClock_Config(void);
void LED_Init(void);
#define LED1_ON HAL_GPIO_WritePin(GPIOB,GPIO_PIN_5, GPIO_PIN_RESET)
#define LED1_OFF HAL_GPIO_WritePin(GPIOB,GPIO_PIN_5, GPIO_PIN_SET)
#define LED1_Toggle HAL_GPIO_TogglePin(GPIOB,GPIO_PIN_5)
#define LED2_ON HAL_GPIO_WritePin(GPIOE,GPIO_PIN_5, GPIO_PIN_RESET)
#define LED2_OFF HAL_GPIO_WritePin(GPIOE,GPIO_PIN_5, GPIO_PIN_SET)
#define LED2_Toggle HAL_GPIO_TogglePin(GPIOE,GPIO_PIN_5)
void Tim3_Init(void);
void Tim3B_Init(void);
TIM_HandleTypeDef TIM3_Handler; //定时器句柄
TIM_OC_InitTypeDef TIM3_CH2Handler; //定时器3通道2句柄
uint ret;
int compare=0;
int main(void)
{
HAL_Init();
SystemClock_Config();
// LED_Init();
// LED1_OFF;
// LED2_OFF;
//Tim3B_Init();
Tim3_Init();
while (1)
{
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 72000000
* HCLK(Hz) = 72000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* HSE PREDIV1 = 1
* PLLMUL = 9
* Flash Latency(WS) = 2
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
RCC_ClkInitTypeDef clkinitstruct = {0};
RCC_OscInitTypeDef oscinitstruct = {0};
/* Enable HSE Oscillator and activate PLL with HSE as source */
oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
oscinitstruct.HSEState = RCC_HSE_ON;
oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
oscinitstruct.PLL.PLLState = RCC_PLL_ON;
oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
{
/* Initialization Error */
while(1);
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
clocks dividers */
clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
{
/* Initialization Error */
while(1);
}
}
void LED_Init(void)
{
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOE_CLK_ENABLE();
GPIO_InitTypeDef GPIO_Init_Struct;
GPIO_Init_Struct.Pin=GPIO_PIN_5;
GPIO_Init_Struct.Mode=GPIO_MODE_OUTPUT_PP;
GPIO_Init_Struct.Pull=GPIO_PULLUP;
GPIO_Init_Struct.Speed=GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOB, &GPIO_Init_Struct);
HAL_GPIO_Init(GPIOE, &GPIO_Init_Struct);
}
void Tim3_Init(void)
{
TIM3_Handler.Instance=TIM3; //定时器3
TIM3_Handler.Init.Prescaler=(7200-1); //定时器分频
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;//向上计数模式
TIM3_Handler.Init.Period=(50000-1); //自动重装载值
TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
HAL_TIM_PWM_Init(&TIM3_Handler); //初始化PWM
TIM3_CH2Handler.OCMode=TIM_OCMODE_PWM1; //模式选择PWM1
TIM3_CH2Handler.Pulse=(50000-1)/2; //设置比较值,此值用来确定占空比，默认比较值为自动重装载值的一半,即占空比为50%
TIM3_CH2Handler.OCPolarity=TIM_OCPOLARITY_LOW; //输出比较极性为低
HAL_TIM_PWM_ConfigChannel(&TIM3_Handler,&TIM3_CH2Handler,TIM_CHANNEL_2);//配置TIM3通道2
HAL_TIM_PWM_Start(&TIM3_Handler,TIM_CHANNEL_2);//开启PWM通道2
}
void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
GPIO_InitTypeDef GPIO_Initure;
if(htim->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_ENABLE(); //使能定时器3
__HAL_RCC_AFIO_CLK_ENABLE();
__HAL_AFIO_REMAP_TIM3_PARTIAL(); //TIM3通道引脚部分重映射使能
__HAL_RCC_GPIOB_CLK_ENABLE(); //开启GPIOB时钟
GPIO_Initure.Pin=GPIO_PIN_5; //PB5
GPIO_Initure.Mode=GPIO_MODE_AF_PP; //复用推挽输出
//GPIO_Initure.Pull=GPIO_PULLUP; //上拉
GPIO_Initure.Speed=GPIO_SPEED_FREQ_HIGH;//高速
HAL_GPIO_Init(GPIOB,&GPIO_Initure);
}
}
void Tim3B_Init(void)
{
TIM3_Handler.Instance=TIM3; //定时器3
TIM3_Handler.Init.Prescaler=(72-1); //定时器分频
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;//向上计数模式
TIM3_Handler.Init.Period=(50000-1); //自动重装载值
TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&TIM3_Handler); //初始化PWM
HAL_TIM_Base_Start_IT(&TIM3_Handler); //使能定时器3和定时器3更新中断：TIM_IT_UPDATE
}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
{
if(htim->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_ENABLE(); //使能TIM3时钟
HAL_NVIC_SetPriority(TIM3_IRQn,1,3); //设置中断优先级，抢占优先级1，子优先级3
HAL_NVIC_EnableIRQ(TIM3_IRQn); //开启ITM3中断
}
}
//定时器3中断服务函数
void TIM3_IRQHandler(void)
{
HAL_TIM_IRQHandler(&TIM3_Handler);
}
//回调函数，定时器中断服务函数调用
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim==(&TIM3_Handler))
{
LED1_Toggle; //LED1反转
}
}