【STM32】STM32学习笔记-定时器定时中断 定时器外部时钟(14)

00. 目录

文章目录

• • 00. 目录
  • 01. 定时器中断相关API
  • • 1.1 TIM_InternalClockConfig
    • 1.2 TIM_TimeBaseInit
    • 1.3 TIM_TimeBaseInitTypeDef
    • 1.4 TIM_ClearFlag
    • 1.5 TIM_ITConfig
    • 1.6 TIM_Cmd
    • 1.7 中断服务函数
    • 1.8 TIM_ETRClockMode2Config
  • 02. 定时器定时中断接线图
  • 03. 定时器定时中断示例
  • 04. 定时器外部时钟接线图
  • 05. 定时器外部时钟示例
  • 06. 程序下载
  • 07. 附录

01. 定时器中断相关API

1.1 TIM_InternalClockConfig

/*** @briefConfigures the TIMx internal Clock* @paramTIMx: where x can be1, 2, 3, 4, 5, 8, 9, 12 or 15* to select the TIM peripheral.* @retval None*/void TIM_InternalClockConfig(TIM_TypeDef* TIMx)功能:设置 TIMx 内部时钟参数:TIMx：x 可以是 2，3 或者 4，来选择 TIM 外设返回值:无 

1.2 TIM_TimeBaseInit

/*** @briefInitializes the TIMx Time Base Unit peripheral according to * the specified parameters in the TIM_TimeBaseInitStruct.* @paramTIMx: where x can be 1 to 17 to select the TIM peripheral.* @paramTIM_TimeBaseInitStruct: pointer to a TIM_TimeBaseInitTypeDef* structure that contains the configuration information for the * specified TIM peripheral.* @retval None*/void TIM_TimeBaseInit(TIM_TypeDef* TIMx, TIM_TimeBaseInitTypeDef* TIM_TimeBaseInitStruct)功能:根据 TIM_TimeBaseInitStruct 中指定的参数初始化 TIMx 的时间基数单位参数:TIMx：x 可以是 2，3 或者 4，来选择 TIM 外设TIMTimeBase_InitStruct：指向结构 TIM_TimeBaseInitTypeDef 的指针，包含了TIMx 时间基数单位的配置信息返回值:无 

1.3 TIM_TimeBaseInitTypeDef

/** * @briefTIM Time Base Init structure definition* @note This structure is used with all TIMx except for TIM6 and TIM7.*/typedef struct{uint16_t TIM_Prescaler; uint16_t TIM_CounterMode; uint16_t TIM_Period;uint16_t TIM_ClockDivision;uint8_t TIM_RepetitionCounter;} TIM_TimeBaseInitTypeDef; TIM_PeriodTIM_Period 设置了在下一个更新事件装入活动的自动重装载寄存器周期的值。它的取值必须在0x0000和0xFFFF之间。TIM_PrescalerTIM_Prescaler 设置了用来作为 TIMx 时钟频率除数的预分频值。它的取值必须在0x0000和0xFFFF之间。/** @defgroup TIM_Counter_Mode * @{*/#define TIM_CounterMode_Up ((uint16_t)0x0000)#define TIM_CounterMode_Down ((uint16_t)0x0010)#define TIM_CounterMode_CenterAligned1 ((uint16_t)0x0020)#define TIM_CounterMode_CenterAligned2 ((uint16_t)0x0040)#define TIM_CounterMode_CenterAligned3 ((uint16_t)0x0060)/** @defgroup TIM_Clock_Division_CKD * @{*/#define TIM_CKD_DIV1 ((uint16_t)0x0000)#define TIM_CKD_DIV2 ((uint16_t)0x0100)#define TIM_CKD_DIV4 ((uint16_t)0x0200)TIM_RepetitionCounter 只用在高级定时器中

1.4 TIM_ClearFlag

/*** @briefClears the TIMx's pending flags.* @paramTIMx: where x can be 1 to 17 to select the TIM peripheral.* @paramTIM_FLAG: specifies the flag bit to clear.* This parameter can be any combination of the following values:* @arg TIM_FLAG_Update: TIM update Flag* @arg TIM_FLAG_CC1: TIM Capture Compare 1 Flag* @arg TIM_FLAG_CC2: TIM Capture Compare 2 Flag* @arg TIM_FLAG_CC3: TIM Capture Compare 3 Flag* @arg TIM_FLAG_CC4: TIM Capture Compare 4 Flag* @arg TIM_FLAG_COM: TIM Commutation Flag* @arg TIM_FLAG_Trigger: TIM Trigger Flag* @arg TIM_FLAG_Break: TIM Break Flag* @arg TIM_FLAG_CC1OF: TIM Capture Compare 1 overcapture Flag* @arg TIM_FLAG_CC2OF: TIM Capture Compare 2 overcapture Flag* @arg TIM_FLAG_CC3OF: TIM Capture Compare 3 overcapture Flag* @arg TIM_FLAG_CC4OF: TIM Capture Compare 4 overcapture Flag* @note* - TIM6 and TIM7 can have only one update flag. * - TIM9, TIM12 and TIM15 can have only TIM_FLAG_Update, TIM_FLAG_CC1,*TIM_FLAG_CC2 or TIM_FLAG_Trigger. * - TIM10, TIM11, TIM13, TIM14, TIM16 and TIM17 can have TIM_FLAG_Update or TIM_FLAG_CC1. * - TIM_FLAG_Break is used only with TIM1, TIM8 and TIM15. * - TIM_FLAG_COM is used only with TIM1, TIM8, TIM15, TIM16 and TIM17. * @retval None*/void TIM_ClearFlag(TIM_TypeDef* TIMx, uint16_t TIM_FLAG)功能:清除 TIMx 的待处理标志位参数:TIMx：x 可以是 2，3 或者 4，来选择 TIM 外设TIM_FLAG：待清除的 TIM 标志位 返回值:无 

1.5 TIM_ITConfig

/*** @briefEnables or disables the specified TIM interrupts.* @paramTIMx: where x can be 1 to 17 to select the TIMx peripheral.* @paramTIM_IT: specifies the TIM interrupts sources to be enabled or disabled.* This parameter can be any combination of the following values:* @arg TIM_IT_Update: TIM update Interrupt source* @arg TIM_IT_CC1: TIM Capture Compare 1 Interrupt source* @arg TIM_IT_CC2: TIM Capture Compare 2 Interrupt source* @arg TIM_IT_CC3: TIM Capture Compare 3 Interrupt source* @arg TIM_IT_CC4: TIM Capture Compare 4 Interrupt source* @arg TIM_IT_COM: TIM Commutation Interrupt source* @arg TIM_IT_Trigger: TIM Trigger Interrupt source* @arg TIM_IT_Break: TIM Break Interrupt source* @note * - TIM6 and TIM7 can only generate an update interrupt.* - TIM9, TIM12 and TIM15 can have only TIM_IT_Update, TIM_IT_CC1,*TIM_IT_CC2 or TIM_IT_Trigger. * - TIM10, TIM11, TIM13, TIM14, TIM16 and TIM17 can have TIM_IT_Update or TIM_IT_CC1. * - TIM_IT_Break is used only with TIM1, TIM8 and TIM15. * - TIM_IT_COM is used only with TIM1, TIM8, TIM15, TIM16 and TIM17.* @paramNewState: new state of the TIM interrupts.* This parameter can be: ENABLE or DISABLE.* @retval None*/void TIM_ITConfig(TIM_TypeDef* TIMx, uint16_t TIM_IT, FunctionalState NewState)功能:使能或者失能指定的 TIM 中断参数:TIMx：x 可以是 2，3 或者 4，来选择 TIM 外设TIM_IT：待使能或者失能的 TIM 中断源NewState：TIMx 中断的新状态返回值:无 

1.6 TIM_Cmd

/*** @briefEnables or disables the specified TIM peripheral.* @paramTIMx: where x can be 1 to 17 to select the TIMx peripheral.* @paramNewState: new state of the TIMx peripheral.* This parameter can be: ENABLE or DISABLE.* @retval None*/void TIM_Cmd(TIM_TypeDef* TIMx, FunctionalState NewState)功能:使能或者失能 TIMx 外设参数:TIMx：x 可以是 2，3 或者 4，来选择 TIM 外设NewState: 外设 TIMx 的新状态 返回值:无

1.7 中断服务函数

参考程序

void TIM2_IRQHandler(void){if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET){Num ++;TIM_ClearITPendingBit(TIM2, TIM_IT_Update);}}

1.8 TIM_ETRClockMode2Config

/*** @briefConfigures the External clock Mode2* @paramTIMx: where x can be1, 2, 3, 4, 5 or 8 to select the TIM peripheral.* @paramTIM_ExtTRGPrescaler: The external Trigger Prescaler.* This parameter can be one of the following values:* @arg TIM_ExtTRGPSC_OFF: ETRP Prescaler OFF.* @arg TIM_ExtTRGPSC_DIV2: ETRP frequency divided by 2.* @arg TIM_ExtTRGPSC_DIV4: ETRP frequency divided by 4.* @arg TIM_ExtTRGPSC_DIV8: ETRP frequency divided by 8.* @paramTIM_ExtTRGPolarity: The external Trigger Polarity.* This parameter can be one of the following values:* @arg TIM_ExtTRGPolarity_Inverted: active low or falling edge active.* @arg TIM_ExtTRGPolarity_NonInverted: active high or rising edge active.* @paramExtTRGFilter: External Trigger Filter.* This parameter must be a value between 0x00 and 0x0F* @retval None*/void TIM_ETRClockMode2Config(TIM_TypeDef* TIMx, uint16_t TIM_ExtTRGPrescaler,uint16_t TIM_ExtTRGPolarity, uint16_t ExtTRGFilter)功能:配置TIMx外部时钟模式2 参数:TIMx：x可以是2，3或者4，来选择TIM外设TIM_ExtTRGPrescaler：外部触发预分频TIM_ExtTRGPolarity：外部时钟极性ExtTRGFilter：外部触发滤波器。该参数取值在0x0和0xF之间。返回值:无

02. 定时器定时中断接线图

03. 定时器定时中断示例

timer.h

#ifndef __TIMER_H__#define __TIMER_H__#include "stm32f10x.h"// Device headervoid timer_init(void);#endif

timer.c

#include "timer.h"void timer_init(void){TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;NVIC_InitTypeDef NVIC_InitStruct;//1. 开启时钟RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//2. 开启定时器2内部时钟TIM_InternalClockConfig(TIM2);//3. 初始化定时器TIM_TimeBaseInitStruct.TIM_Period = 10000 - 1;TIM_TimeBaseInitStruct.TIM_Prescaler = 7200 - 1;TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0; //高级定时器使用TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);//4. 清除中断标志TIM_ClearFlag(TIM2, TIM_FLAG_Update);//5. 使能中断TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);//6. 设置NVICNVIC_InitStruct.NVIC_IRQChannel = TIM2_IRQn;NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE ;NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;NVIC_Init(&NVIC_InitStruct);//7. 使能定时器TIM_Cmd(TIM2, ENABLE);}

main.c

#include "stm32f10x.h"#include "delay.h"#include "oled.h"#include "timer.h"int16_t num; int main(void) { //初始化OLED_Init(); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); timer_init(); OLED_ShowString(1, 1, "num:");while (1){OLED_ShowNum(1, 5, num, 5);}return 0; }void TIM2_IRQHandler(void) {if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET){num ++;TIM_ClearITPendingBit(TIM2, TIM_IT_Update);}}

04. 定时器外部时钟接线图

05. 定时器外部时钟示例

timer.h

#ifndef __TIMER_H__#define __TIMER_H__#include "stm32f10x.h"// Device headervoid timer_init(void);#endif

timer.c

#include "timer.h"void timer_init(void){GPIO_InitTypeDef GPIO_InitStructure;TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;NVIC_InitTypeDef NVIC_InitStruct;//1. 开启时钟RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);//2. 配置TIMx外部时钟模式2 TIM_ETRClockMode2Config(TIM2, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_NonInverted, 0xf);//3. 初始化定时器TIM_TimeBaseInitStruct.TIM_Period = 10 - 1;TIM_TimeBaseInitStruct.TIM_Prescaler = 1 - 1;TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0; //高级定时器使用TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);//4. 清除中断标志TIM_ClearFlag(TIM2, TIM_FLAG_Update);//5. 使能中断TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);//6. 设置NVICNVIC_InitStruct.NVIC_IRQChannel = TIM2_IRQn;NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE ;NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;NVIC_Init(&NVIC_InitStruct);//7. 使能定时器TIM_Cmd(TIM2, ENABLE);}

main.c

#include "stm32f10x.h"#include "delay.h"#include "oled.h"#include "timer.h"int16_t num; int main(void) { //初始化OLED_Init(); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); timer_init(); OLED_ShowString(1, 1, "num:");while (1){OLED_ShowNum(1, 5, num, 5);OLED_ShowNum(2, 5, TIM_GetCounter(TIM2), 5);}return 0; }void TIM2_IRQHandler(void) {if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET){num ++;TIM_ClearITPendingBit(TIM2, TIM_IT_Update);}} 

06. 程序下载

09-定时器定时中断.rar

10-定时器外部时钟.rar

07. 附录

参考: 【STM32】江科大STM32学习笔记汇总