【STM32】STM32学习笔记-对射式红外传感器计次 旋转编码器计次(12)

00. 目录

01. NVIC相关函数

相关头文件: misc.h

1.1 NVIC_PriorityGroupConfig函数

/*** @brief  Configures the priority grouping: pre-emption priority and subpriority.* @param  NVIC_PriorityGroup: specifies the priority grouping bits length. *   This parameter can be one of the following values:*     @arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority*                                4 bits for subpriority*     @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority*                                3 bits for subpriority*     @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority*                                2 bits for subpriority*     @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority*                                1 bits for subpriority*     @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority*                                0 bits for subpriority* @retval None*/
void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup);
功能:设置优先级分组：先占优先级和从优先级
参数:NVIC_PriorityGroup：优先级分组位长度     
返回值:无

1.2 NVIC_PriorityGroup类型

/** @defgroup Preemption_Priority_Group * @{*/#define NVIC_PriorityGroup_0         ((uint32_t)0x700) /*!< 0 bits for pre-emption priority4 bits for subpriority */
#define NVIC_PriorityGroup_1         ((uint32_t)0x600) /*!< 1 bits for pre-emption priority3 bits for subpriority */
#define NVIC_PriorityGroup_2         ((uint32_t)0x500) /*!< 2 bits for pre-emption priority2 bits for subpriority */
#define NVIC_PriorityGroup_3         ((uint32_t)0x400) /*!< 3 bits for pre-emption priority1 bits for subpriority */
#define NVIC_PriorityGroup_4         ((uint32_t)0x300) /*!< 4 bits for pre-emption priority0 bits for subpriority */

1.3 NVIC_Init函数

/*** @brief  Initializes the NVIC peripheral according to the specified*         parameters in the NVIC_InitStruct.* @param  NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains*         the configuration information for the specified NVIC peripheral.* @retval None*/
void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
功能:根据 NVIC_InitStruct 中指定的参数初始化外设 NVIC 寄存器
参数:NVIC_InitStruct：指向结构 NVIC_InitTypeDef 的指针，包含了外设 GPIO 的配置信息     
返回值:无    

1.4 NVIC_InitTypeDef类型

typedef struct
{uint8_t NVIC_IRQChannel; //指定要启用或禁用的IRQ通道uint8_t NVIC_IRQChannelPreemptionPriority;//指定的IRQ通道的抢占优先级uint8_t NVIC_IRQChannelSubPriority; //指定的IRQ通道的次级优先级FunctionalState NVIC_IRQChannelCmd; //IRQ通道是启用还是禁用 
} NVIC_InitTypeDef;

NVIC_IRQChannel取值

#ifdef STM32F10X_MDADC1_2_IRQn                 = 18,     /*!< ADC1 and ADC2 global Interrupt                       */USB_HP_CAN1_TX_IRQn         = 19,     /*!< USB Device High Priority or CAN1 TX Interrupts       */USB_LP_CAN1_RX0_IRQn        = 20,     /*!< USB Device Low Priority or CAN1 RX0 Interrupts       */CAN1_RX1_IRQn               = 21,     /*!< CAN1 RX1 Interrupt                                   */CAN1_SCE_IRQn               = 22,     /*!< CAN1 SCE Interrupt                                   */EXTI9_5_IRQn                = 23,     /*!< External Line[9:5] Interrupts                        */TIM1_BRK_IRQn               = 24,     /*!< TIM1 Break Interrupt                                 */TIM1_UP_IRQn                = 25,     /*!< TIM1 Update Interrupt                                */TIM1_TRG_COM_IRQn           = 26,     /*!< TIM1 Trigger and Commutation Interrupt               */TIM1_CC_IRQn                = 27,     /*!< TIM1 Capture Compare Interrupt                       */TIM2_IRQn                   = 28,     /*!< TIM2 global Interrupt                                */TIM3_IRQn                   = 29,     /*!< TIM3 global Interrupt                                */TIM4_IRQn                   = 30,     /*!< TIM4 global Interrupt                                */I2C1_EV_IRQn                = 31,     /*!< I2C1 Event Interrupt                                 */I2C1_ER_IRQn                = 32,     /*!< I2C1 Error Interrupt                                 */I2C2_EV_IRQn                = 33,     /*!< I2C2 Event Interrupt                                 */I2C2_ER_IRQn                = 34,     /*!< I2C2 Error Interrupt                                 */SPI1_IRQn                   = 35,     /*!< SPI1 global Interrupt                                */SPI2_IRQn                   = 36,     /*!< SPI2 global Interrupt                                */USART1_IRQn                 = 37,     /*!< USART1 global Interrupt                              */USART2_IRQn                 = 38,     /*!< USART2 global Interrupt                              */USART3_IRQn                 = 39,     /*!< USART3 global Interrupt                              */EXTI15_10_IRQn              = 40,     /*!< External Line[15:10] Interrupts                      */RTCAlarm_IRQn               = 41,     /*!< RTC Alarm through EXTI Line Interrupt                */USBWakeUp_IRQn              = 42      /*!< USB Device WakeUp from suspend through EXTI Line Interrupt */  
#endif /* STM32F10X_MD */  

成员NVIC_IRQChannelPreemptionPriority可赋的值：最大取值15，具体有上面设置的优先级组中规定的位数决定
成员NVIC_IRQChannelSubPriority可赋的值：最大取值15，具体有上面设置的优先级组中规定的位数决定
成员NVIC_IRQChannelCmd可赋的值：ENABLE or DISABLE

02. 外部中断相关API

2.1 GPIO_EXTILineConfig

void GPIO_EXTILineConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource);
功能:选择 GPIO 管脚用作外部中断线路
参数:GPIO_PortSource: 选择用作外部中断线源的 GPIO 端口GPIO_PinSource：待设置的外部中断线路    
返回值:无    

参数：GPIO_PortSource 选择用于EXTI线的GPIO端口

/** @defgroup GPIO_Port_Sources * @{*/#define GPIO_PortSourceGPIOA       ((uint8_t)0x00)
#define GPIO_PortSourceGPIOB       ((uint8_t)0x01)
#define GPIO_PortSourceGPIOC       ((uint8_t)0x02)
#define GPIO_PortSourceGPIOD       ((uint8_t)0x03)
#define GPIO_PortSourceGPIOE       ((uint8_t)0x04)
#define GPIO_PortSourceGPIOF       ((uint8_t)0x05)
#define GPIO_PortSourceGPIOG       ((uint8_t)0x06)

参数：GPIO_PortSource 选择用于EXTI线的GPIO端口

/** @defgroup GPIO_Pin_sources * @{*/#define GPIO_PinSource0            ((uint8_t)0x00)
#define GPIO_PinSource1            ((uint8_t)0x01)
#define GPIO_PinSource2            ((uint8_t)0x02)
#define GPIO_PinSource3            ((uint8_t)0x03)
#define GPIO_PinSource4            ((uint8_t)0x04)
#define GPIO_PinSource5            ((uint8_t)0x05)
#define GPIO_PinSource6            ((uint8_t)0x06)
#define GPIO_PinSource7            ((uint8_t)0x07)
#define GPIO_PinSource8            ((uint8_t)0x08)
#define GPIO_PinSource9            ((uint8_t)0x09)
#define GPIO_PinSource10           ((uint8_t)0x0A)
#define GPIO_PinSource11           ((uint8_t)0x0B)
#define GPIO_PinSource12           ((uint8_t)0x0C)
#define GPIO_PinSource13           ((uint8_t)0x0D)
#define GPIO_PinSource14           ((uint8_t)0x0E)
#define GPIO_PinSource15           ((uint8_t)0x0F)

2.2 EXTI_Init

void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct);
功能:根据 EXTI_InitStruct 中指定的参数初始化外设 EXTI 寄存器
参数:EXTI_InitStruct：指向结构 EXTI_InitTypeDef 的指针，包含了外设 EXTI 的配置信息 
返回值:无    

EXTI_InitTypeDef类型

typedef struct
{uint32_t EXTI_Line; 				//中断线EXTIMode_TypeDef EXTI_Mode; 		//中断模式EXTITrigger_TypeDef EXTI_Trigger; 	//中断触发方式FunctionalState EXTI_LineCmd; 		//中断功能使能
}EXTI_InitTypeDef;

EXTI_Line

/** @defgroup EXTI_Lines * @{*/#define EXTI_Line0       ((uint32_t)0x00001)  /*!< External interrupt line 0 */
#define EXTI_Line1       ((uint32_t)0x00002)  /*!< External interrupt line 1 */
#define EXTI_Line2       ((uint32_t)0x00004)  /*!< External interrupt line 2 */
#define EXTI_Line3       ((uint32_t)0x00008)  /*!< External interrupt line 3 */
#define EXTI_Line4       ((uint32_t)0x00010)  /*!< External interrupt line 4 */
#define EXTI_Line5       ((uint32_t)0x00020)  /*!< External interrupt line 5 */
#define EXTI_Line6       ((uint32_t)0x00040)  /*!< External interrupt line 6 */
#define EXTI_Line7       ((uint32_t)0x00080)  /*!< External interrupt line 7 */
#define EXTI_Line8       ((uint32_t)0x00100)  /*!< External interrupt line 8 */
#define EXTI_Line9       ((uint32_t)0x00200)  /*!< External interrupt line 9 */
#define EXTI_Line10      ((uint32_t)0x00400)  /*!< External interrupt line 10 */
#define EXTI_Line11      ((uint32_t)0x00800)  /*!< External interrupt line 11 */
#define EXTI_Line12      ((uint32_t)0x01000)  /*!< External interrupt line 12 */
#define EXTI_Line13      ((uint32_t)0x02000)  /*!< External interrupt line 13 */
#define EXTI_Line14      ((uint32_t)0x04000)  /*!< External interrupt line 14 */
#define EXTI_Line15      ((uint32_t)0x08000)  /*!< External interrupt line 15 */
#define EXTI_Line16      ((uint32_t)0x10000)  /*!< External interrupt line 16 Connected to the PVD Output */
#define EXTI_Line17      ((uint32_t)0x20000)  /*!< External interrupt line 17 Connected to the RTC Alarm event */
#define EXTI_Line18      ((uint32_t)0x40000)  /*!< External interrupt line 18 Connected to the USB Device/USB OTG FSWakeup from suspend event */                                    
#define EXTI_Line19      ((uint32_t)0x80000)  /*!< External interrupt line 19 Connected to the Ethernet Wakeup event */

成员EXTI_Mode可赋的值：（中断模式）

typedef enum
{EXTI_Mode_Interrupt = 0x00,//中断EXTI_Mode_Event = 0x04   //事件
}EXTIMode_TypeDef;

成员EXTI_Trigger可赋的值（中断）

typedef enum
{EXTI_Trigger_Rising = 0x08, //上升沿触发EXTI_Trigger_Falling = 0x0C, //下降沿触发EXTI_Trigger_Rising_Falling = 0x10 //双边延触发
}EXTITrigger_TypeDef;

成员EXTI_LineCmd可赋的值： ENABLE or DISABLE

2.3 EXTI_GetITStatus

/*** @brief  Checks whether the specified EXTI line is asserted or not.* @param  EXTI_Line: specifies the EXTI line to check.*   This parameter can be:*     @arg EXTI_Linex: External interrupt line x where x(0..19)* @retval The new state of EXTI_Line (SET or RESET).*/
ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
功能:检查指定的 EXTI 线路触发请求发生与否
参数:EXTI_Line：待检查 EXTI 线路的挂起位 
返回值:EXTI_Line 的新状态（SET 或者 RESET） 

2.4 EXTI_ClearITPendingBit

/*** @brief  Clears the EXTI's line pending bits.* @param  EXTI_Line: specifies the EXTI lines to clear.*   This parameter can be any combination of EXTI_Linex where x can be (0..19).* @retval None*/
void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
功能:清除 EXTI 线路挂起位
参数:EXTI_Line：待清除 EXTI 线路的挂起位 
返回值:无 

2.5 中断回调函数

EXPORT EXTI0_IRQHandler
EXPORT EXTI1_IRQHandler
EXPORT EXTI2_IRQHandler
EXPORT EXTI3_IRQHandler
EXPORT EXTI4_IRQHandler
EXPORT EXTI9_5_IRQHandler
EXPORT EXTI15_10_IRQHandler

常用的中断服务函数格式为：

void EXTI3_IRQHandler(void)
{if(EXTI_GetITStatus(EXTI_Line3)!=RESET)//判断某个线上的中断是否发生{//中断逻辑…EXTI_ClearITPendingBit(EXTI_Line3); //清除 LINE 上的中断标志位} 
}

03. 对射式红外传感器计次接线图

04. 对射式红外传感器计次程序示例

CountSensor.h

#ifndef __COUNT_SENSOR_H__
#define __COUNT_SENSOR_H__#include "stm32f10x.h" void count_sensor_init(void);uint16_t CountSensor_Get(void);#endif /*__COUNT_SENSOR_H__*/

CountSensor.c

#include "CountSensor.h"uint16_t CountSensor_Count = 0;//初始化
void count_sensor_init(void)
{GPIO_InitTypeDef GPIO_InitStruct;EXTI_InitTypeDef EXTI_InitStruct;NVIC_InitTypeDef NVIC_InitStruct;//使能时钟RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);//初始化GPIOGPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU ;GPIO_InitStruct.GPIO_Pin = GPIO_Pin_14;GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIO_InitStruct);//初始化外部中断线GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource14);//初始化外部中断EXTI_InitStruct.EXTI_Line = EXTI_Line14;EXTI_InitStruct.EXTI_LineCmd = ENABLE ;EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_Init(&EXTI_InitStruct);//初始化NVICNVIC_InitStruct.NVIC_IRQChannel = EXTI15_10_IRQn;NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE ;NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;NVIC_Init(&NVIC_InitStruct);
}uint16_t CountSensor_Get(void)
{return CountSensor_Count;
}void EXTI15_10_IRQHandler(void)
{if (EXTI_GetITStatus(EXTI_Line14) == SET){/*如果出现数据乱跳的现象，可再次判断引脚电平，以避免抖动*/if (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_14) == 0){CountSensor_Count ++;}EXTI_ClearITPendingBit(EXTI_Line14);}
}

main.c

#include "stm32f10x.h"#include "delay.h"
#include "oled.h"
#include "CountSensor.h"int main(void){		 //初始化OLED_Init();OLED_ShowString(1, 1, "Count:");NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);count_sensor_init();while(1){OLED_ShowNum(1 , 7, CountSensor_Get(), 5);}return 0;}

05. 旋转编码器计次接线图

【其它】

06. 旋转编码器计次程序示例

encode.h

#ifndef __ENCODE_H__
#define __ENCODE_H__#include "stm32f10x.h"   void Encoder_Init(void);
int16_t Encoder_Get(void);#endif /*__ENCODE_H__*/

encode.c

#include "encode.h"int16_t Encoder_Count;void Encoder_Init(void)
{NVIC_InitTypeDef NVIC_InitStructure;GPIO_InitTypeDef GPIO_InitStructure;EXTI_InitTypeDef EXTI_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIO_InitStructure);GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource0);GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource1);EXTI_InitStructure.EXTI_Line = EXTI_Line0 | EXTI_Line1;EXTI_InitStructure.EXTI_LineCmd = ENABLE;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;EXTI_Init(&EXTI_InitStructure);NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_Init(&NVIC_InitStructure);NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;NVIC_Init(&NVIC_InitStructure);
}int16_t Encoder_Get(void)
{int16_t Temp;Temp = Encoder_Count;Encoder_Count = 0;return Temp;
}void EXTI0_IRQHandler(void)
{if (EXTI_GetITStatus(EXTI_Line0) == SET){/*如果出现数据乱跳的现象，可再次判断引脚电平，以避免抖动*/if (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_0) == 0){if (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_1) == 0){Encoder_Count --;}}EXTI_ClearITPendingBit(EXTI_Line0);}
}void EXTI1_IRQHandler(void)
{if (EXTI_GetITStatus(EXTI_Line1) == SET){/*如果出现数据乱跳的现象，可再次判断引脚电平，以避免抖动*/if (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_1) == 0){if (GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_0) == 0){Encoder_Count ++;}}EXTI_ClearITPendingBit(EXTI_Line1);}
}

main.c

#include "stm32f10x.h"#include "delay.h"
#include "oled.h"
#include "CountSensor.h"
#include "encode.h"int16_t Num;int main(void){		 //初始化OLED_Init();NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);Encoder_Init();OLED_ShowString(1, 1, "Num:");while (1){Num += Encoder_Get();OLED_ShowSignedNum(1, 5, Num, 5);}return 0;}

07. 示例程序下载

07-对射式红外传感器计次.rar

08-旋转编码器计次.rar

08. 附录

参考: 【STM32】江科大STM32学习笔记汇总