00. 目录
文章目录
01. 定时器中断相关API
1.1 TIM_InternalClockConfig
/**
* @brief Configures the TIMx internal Clock
* @param TIMx: where x can be 1, 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
/**
* @brief Initializes the TIMx Time Base Unit peripheral according to
* the specified parameters in the TIM_TimeBaseInitStruct.
* @param TIMx: where x can be 1 to 17 to select the TIM peripheral.
* @param TIM_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
/**
* @brief TIM 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_Period
TIM_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_Prescaler
TIM_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
/**
* @brief Clears the TIMx's pending flags.
* @param TIMx: where x can be 1 to 17 to select the TIM peripheral.
* @param TIM_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
/**
* @brief Enables or disables the specified TIM interrupts.
* @param TIMx: where x can be 1 to 17 to select the TIMx peripheral.
* @param TIM_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.
* @param NewState: 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
/**
* @brief Enables or disables the specified TIM peripheral.
* @param TIMx: where x can be 1 to 17 to select the TIMx peripheral.
* @param NewState: 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
/**
* @brief Configures the External clock Mode2
* @param TIMx: where x can be 1, 2, 3, 4, 5 or 8 to select the TIM peripheral.
* @param TIM_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.
* @param TIM_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.
* @param ExtTRGFilter: 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 header
void 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NVIC
NVIC_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 header
void 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NVIC
NVIC_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);
}
}
