求助STM32F103 Timer3 CH2 PWM輸出問題

ID:916650 · 發(fā)表于 2022-12-8 10:28

我用IAR寫的PWM輸出程序，正常應(yīng)該看到PB5的小燈亮滅交替，結(jié)果一直是常亮狀態(tài)，搜了一圈沒搞明白怎么回事
基本定時功能和中斷倒是正常，PWM輸出無作用

//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; //定時器句柄
TIM_OC_InitTypeDef TIM3_CH2Handler; //定時器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; //定時器3
TIM3_Handler.Init.Prescaler=(72-1); //定時器分頻
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;//向上計數(shù)模式
TIM3_Handler.Init.Period=(50000-1); //自動重裝載值
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; //模式選擇PWM1
TIM3_CH2Handler.Pulse=(50000-1)/2; //設(shè)置比較值,此值用來確定占空比，默認(rèn)比較值為自動重裝載值的一半,即占空比為50%
TIM3_CH2Handler.OCPolarity=TIM_OCPOLARITY_LOW; //輸出比較極性為低
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);//開啟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(); //使能定時器3
__HAL_RCC_GPIOB_CLK_ENABLE(); //開啟GPIOB時鐘
__HAL_AFIO_REMAP_TIM3_PARTIAL(); //TIM3通道引腳部分重映射使能
GPIO_Initure.Pin=GPIO_PIN_5; //PB5
GPIO_Initure.Mode=GPIO_MODE_AF_PP; //復(fù)用推挽輸出
//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; //定時器3
TIM3_Handler.Init.Prescaler=(72-1)*100; //定時器分頻
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;//向上計數(shù)模式
TIM3_Handler.Init.Period=(50000-1); //自動重裝載值
TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&TIM3_Handler); //初始化PWM
HAL_TIM_Base_Start_IT(&TIM3_Handler); //使能定時器3和定時器3更新中斷：TIM_IT_UPDATE
}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
{
if(htim->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_ENABLE(); //使能TIM3時鐘
HAL_NVIC_SetPriority(TIM3_IRQn,1,3); //設(shè)置中斷優(yōu)先級，搶占優(yōu)先級1，子優(yōu)先級3
HAL_NVIC_EnableIRQ(TIM3_IRQn); //開啟ITM3中斷
}
}
//定時器3中斷服務(wù)函數(shù)
void TIM3_IRQHandler(void)
{
HAL_TIM_IRQHandler(&TIM3_Handler);
}
//回調(diào)函數(shù)，定時器中斷服務(wù)函數(shù)調(diào)用
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim==(&TIM3_Handler))
{
LED1_Toggle; //LED1反轉(zhuǎn)
}
}

復(fù)制代碼

ID:916650 · 發(fā)表于 2022-12-8 12:56

更新一下，我好像發(fā)現(xiàn)問題所在了
問題出在缺少語句__HAL_RCC_AFIO_CLK_ENABLE();
而且這個語句必須在PWM輸出引腳重映射語句前執(zhí)行，否則就不會執(zhí)行PWM輸出引腳重映射，PWM不會從PB5輸出。

現(xiàn)在在我的程序中單獨執(zhí)行PWM輸出，PB5就可以正常亮滅了

//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; //定時器句柄
TIM_OC_InitTypeDef TIM3_CH2Handler; //定時器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; //定時器3
TIM3_Handler.Init.Prescaler=(7200-1); //定時器分頻
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;//向上計數(shù)模式
TIM3_Handler.Init.Period=(50000-1); //自動重裝載值
TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
HAL_TIM_PWM_Init(&TIM3_Handler); //初始化PWM
TIM3_CH2Handler.OCMode=TIM_OCMODE_PWM1; //模式選擇PWM1
TIM3_CH2Handler.Pulse=(50000-1)/2; //設(shè)置比較值,此值用來確定占空比，默認(rèn)比較值為自動重裝載值的一半,即占空比為50%
TIM3_CH2Handler.OCPolarity=TIM_OCPOLARITY_LOW; //輸出比較極性為低
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);//開啟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(); //使能定時器3
__HAL_RCC_AFIO_CLK_ENABLE();
__HAL_AFIO_REMAP_TIM3_PARTIAL(); //TIM3通道引腳部分重映射使能
__HAL_RCC_GPIOB_CLK_ENABLE(); //開啟GPIOB時鐘
GPIO_Initure.Pin=GPIO_PIN_5; //PB5
GPIO_Initure.Mode=GPIO_MODE_AF_PP; //復(fù)用推挽輸出
//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; //定時器3
TIM3_Handler.Init.Prescaler=(72-1); //定時器分頻
TIM3_Handler.Init.CounterMode=TIM_COUNTERMODE_UP;//向上計數(shù)模式
TIM3_Handler.Init.Period=(50000-1); //自動重裝載值
TIM3_Handler.Init.ClockDivision=TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&TIM3_Handler); //初始化PWM
HAL_TIM_Base_Start_IT(&TIM3_Handler); //使能定時器3和定時器3更新中斷：TIM_IT_UPDATE
}
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
{
if(htim->Instance==TIM3)
{
__HAL_RCC_TIM3_CLK_ENABLE(); //使能TIM3時鐘
HAL_NVIC_SetPriority(TIM3_IRQn,1,3); //設(shè)置中斷優(yōu)先級，搶占優(yōu)先級1，子優(yōu)先級3
HAL_NVIC_EnableIRQ(TIM3_IRQn); //開啟ITM3中斷
}
}
//定時器3中斷服務(wù)函數(shù)
void TIM3_IRQHandler(void)
{
HAL_TIM_IRQHandler(&TIM3_Handler);
}
//回調(diào)函數(shù)，定時器中斷服務(wù)函數(shù)調(diào)用
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if(htim==(&TIM3_Handler))
{
LED1_Toggle; //LED1反轉(zhuǎn)
}
}

復(fù)制代碼

ID:814525 · 發(fā)表于 2022-12-8 13:01

要能看到LED閃爍，PWM頻率必須要十幾赫茲一下。頻率高了，是看不到的，必須用示波器觀察。

ID:77589 · 發(fā)表于 2022-12-8 14:34

初步看了一下，你設(shè)置PWM的頻率是20Hz, 人眼應(yīng)該是感覺不到閃爍。
你先試試幾Hz的情況。

ID:916650 · 發(fā)表于 2022-12-8 15:21

張?zhí)鞄?發(fā)表于 2022-12-8 13:01
要能看到LED閃爍，PWM頻率必須要十幾赫茲一下。頻率高了，是看不到的，必須用示波器觀察。

感謝回復(fù)，確實頻率設(shè)的有些低了
問題后來解決了，發(fā)現(xiàn)是少了復(fù)用引腳時鐘開啟語句。

ID:916650 · 發(fā)表于 2022-12-8 15:21

Longan.Wang 發(fā)表于 2022-12-8 14:34
初步看了一下，你設(shè)置PWM的頻率是20Hz, 人眼應(yīng)該是感覺不到閃爍。
你先試試幾Hz的情況。

感謝回復(fù)，確實頻率設(shè)的有些低了
問題后來解決了，發(fā)現(xiàn)是少了復(fù)用引腳時鐘開啟語句。

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求助STM32F103 Timer3 CH2 PWM輸出問題