承德网站建设咨询,做的比较好的网站有哪些,汉力建设网站,京东网上商城怎么看订单文档说明#xff1a;通过滴答定时器的1ms中断实现时间计数#xff0c;标记需要的时间标志#xff0c;在主函数中查询标志#xff0c;避免延时函数消耗CPU
1、HAL库systick定时器说明
在CubeMx生成的代码main()函数首先执行的函数为HAL_Init();里面会进行滴答定时器初始化…文档说明通过滴答定时器的1ms中断实现时间计数标记需要的时间标志在主函数中查询标志避免延时函数消耗CPU
1、HAL库systick定时器说明
在CubeMx生成的代码main()函数首先执行的函数为HAL_Init();里面会进行滴答定时器初始化
/*** brief This function is used to initialize the HAL Library; it must be the first * instruction to be executed in the main program (before to call any other* HAL function), it performs the following:* Configure the Flash prefetch, instruction and Data caches.* Configures the SysTick to generate an interrupt each 1 millisecond,* which is clocked by the HSI (at this stage, the clock is not yet* configured and thus the system is running from the internal HSI at 16 MHz).* Set NVIC Group Priority to 4.* Calls the HAL_MspInit() callback function defined in user file * stm32f4xx_hal_msp.c to do the global low level hardware initialization * * note SysTick is used as time base for the HAL_Delay() function, the application* need to ensure that the SysTick time base is always set to 1 millisecond* to have correct HAL operation.* retval HAL status*/
HAL_StatusTypeDef HAL_Init(void)
{/* Configure Flash prefetch, Instruction cache, Data cache */
#if (INSTRUCTION_CACHE_ENABLE ! 0U)__HAL_FLASH_INSTRUCTION_CACHE_ENABLE();
#endif /* INSTRUCTION_CACHE_ENABLE */#if (DATA_CACHE_ENABLE ! 0U)__HAL_FLASH_DATA_CACHE_ENABLE();
#endif /* DATA_CACHE_ENABLE */#if (PREFETCH_ENABLE ! 0U)__HAL_FLASH_PREFETCH_BUFFER_ENABLE();
#endif /* PREFETCH_ENABLE *//* Set Interrupt Group Priority */HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);/* Use systick as time base source and configure 1ms tick (default clock after Reset is HSI) */HAL_InitTick(TICK_INT_PRIORITY);/* Init the low level hardware */HAL_MspInit();/* Return function status */return HAL_OK;
}此处就是在做初始化滴答定时器 /* Use systick as time base source and configure 1ms tick (default clock after Reset is HSI) */HAL_InitTick(TICK_INT_PRIORITY);意思就是他的中断函数会1ms调用1次HAL_InitTick函数里面就是实现配置的
__weak HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
{/* Configure the SysTick to have interrupt in 1ms time basis*/if (HAL_SYSTICK_Config(SystemCoreClock / (1000U / uwTickFreq)) 0U){return HAL_ERROR;}......return HAL_OK;
}typedef enum
{HAL_TICK_FREQ_10HZ 100U,HAL_TICK_FREQ_100HZ 10U,HAL_TICK_FREQ_1KHZ 1U,HAL_TICK_FREQ_DEFAULT HAL_TICK_FREQ_1KHZ
} HAL_TickFreqTypeDef;
HAL_TickFreqTypeDef uwTickFreq HAL_TICK_FREQ_DEFAULT; /* 1KHz */由此可得HAL_SYSTICK_Config系统时钟/1000U/1,所以是1KHz的中断
2、时间戳文件
Timestamp_Driver.h
#ifndef _Timestamp_Driver_H_
#define _Timestamp_Driver_H_
#include main.htypedef enum
{Timestamp_10ms 0,Timestamp_50ms 1,Timestamp_100ms 2,Timestamp_200ms 3,Timestamp_500ms 4,Timestamp_1s 5,Timestamp_2s 6,Timestamp_10s 7,
}Timestamp_Flag_EnumDef;typedef struct
{/******************************* bit Annotation:Timestamp_Flag_EnumDef 使用后需自行清零* 7--10s* 6--2s* 5--1s* 4--500ms* 3--200ms* 2--100ms* 1--50ms* 0--10ms* ***************************/uint8_t Flag;uint16_t msCnt;//Max 10s
}Timestamp_User_StructDef;extern void Timestamp_UserInit(Timestamp_User_StructDef *p);
extern void Timestamp_Timer(Timestamp_User_StructDef *p);
extern uint8_t Timestamp_GetStatus(Timestamp_User_StructDef *p,Timestamp_Flag_EnumDef flag);#endif
Timestamp_Driver.c
/**********************************************************************
*file:时间戳文件
*author:残梦
*date:2022.9.2
*note:注用户禁止使用、更改
为了方便将时间进行计数划分方便将任务按实时性划分运行减少消耗
**********************************************************************/
#include Timestamp_Driver.h/****************************************
function:时间戳初始化
param:
return:void
date:2022.9.2
note:
****************************************/
void Timestamp_UserInit(Timestamp_User_StructDef *p)
{p-msCnt 0; p-Flag 0;
}/****************************************
function:时间戳计时器
param:
return:void
date:2022.9.2
note:
****************************************/
void Timestamp_Timer(Timestamp_User_StructDef *p)
{p-msCnt;p-Flag | ((((p-msCnt % 10) 0)?1:0) Timestamp_10ms);p-Flag | ((((p-msCnt % 50) 0)?1:0) Timestamp_50ms);p-Flag | ((((p-msCnt % 100) 0)?1:0) Timestamp_100ms);p-Flag | ((((p-msCnt % 200) 0)?1:0) Timestamp_200ms);p-Flag | ((((p-msCnt % 500) 0)?1:0) Timestamp_500ms);p-Flag | ((((p-msCnt % 1000) 0)?1:0) Timestamp_1s);p-Flag | ((((p-msCnt % 2000) 0)?1:0) Timestamp_2s);p-Flag | ((((p-msCnt % 10000) 0)?1:0) Timestamp_10s);p-msCnt (p-msCnt 10000)?0:p-msCnt;
}/****************************************
function:获取时间戳x状态
param:flag--Timestamp_Flag_EnumDef
return:0--无效,1--有效
date:2022.8.13
note:
****************************************/
uint8_t Timestamp_GetStatus(Timestamp_User_StructDef *p,Timestamp_Flag_EnumDef flag)
{uint8_t temp 0,status 0;temp 1 flag;status (p-Flag temp)?1:0;p-Flag (~temp);return status;
}
说明此文件其实就是循环计数1ms计算时间是否等于标志时间没什么特别的
3、使用时间戳
1、添加文件Timestamp_Driver.c到工程 2、定义时间戳变量
Timestamp_User_StructDef TimestampNRT;//定义时间戳:SysTick_Handler()调用计数3、主函数初始化时间戳
Timestamp_UserInit(TimestampNRT);4、滴答定时器中断服务函数中调用时间戳计数函数
void SysTick_Handler(void)
{/* USER CODE BEGIN SysTick_IRQn 0 *//* USER CODE END SysTick_IRQn 0 */HAL_IncTick();/* USER CODE BEGIN SysTick_IRQn 1 */extern Timestamp_User_StructDef TimestampNRT;//时间戳Timestamp_Timer(TimestampNRT); //1ms计数一次/* USER CODE END SysTick_IRQn 1 */
}5、main()函数while中查询时间标志并执行操作 if(Timestamp_GetStatus(TimestampNRT,Timestamp_1s))//标志会查询后清除{printf(Timestamp_1s\r\n);}
