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/* The definition of the timers themselves. */
typedef struct tmrTimerControl /* The old naming convention is used to prevent breaking kernel aware debuggers. */
{
const char *pcTimerName; /*<< Text name. This is not used by the kernel, it is included simply to make debugging easier. */ /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
ListItem_t xTimerListItem; /*<< Standard linked list item as used by all kernel features for event management. */
TickType_t xTimerPeriodInTicks;/*<< How quickly and often the timer expires. */
void *pvTimerID; /*<< An ID to identify the timer. This allows the timer to be identified when the same callback is used for multiple timers. */
TimerCallbackFunction_t pxCallbackFunction; /*<< The function that will be called when the timer expires. */
#if( configUSE_TRACE_FACILITY == 1 )
UBaseType_t uxTimerNumber; /*<< An ID assigned by trace tools such as FreeRTOS+Trace */
#endif
uint8_t ucStatus; /*<< Holds bits to say if the timer was statically allocated or not, and if it is active or not. */
} xTIMER;
pcTimerName
xTimerListItem
xTimerPeriodInTicks
pvTimerID
pxCallbackFunction
ucStatus
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TimerHandle_t xTimerCreate(const char * const pcTimerName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
const TickType_t xTimerPeriodInTicks,
const UBaseType_t uxAutoReload,
void * const pvTimerID,
TimerCallbackFunction_t pxCallbackFunction )
BaseType_t xTimerGenericCommand(TimerHandle_t xTimer,const BaseType_t xCommandID,const TickType_t xOptionalValue,BaseType_t * const pxHigherPriorityTaskWoken,const TickType_t xTicksToWait)
BaseType_t xTimerStart(TimerHandle_t xTimer,const TickType_t xTicksToWait)
BaseType_t xTimerStop(TimerHandle_t xTimer, TickType_t xTicksToWait)
BaseType_t xTimerChangePeriod(TimerHandle_t xTimer,TickType_t xNewPeriod,TickType_t xTicksToWait)
BaseType_t xTimerDelete(TimerHandle_t xTimer, TickType_t xTicksToWait)
BaseType_t xTimerReset(TimerHandle_t xTimer,TickType_t xTicksToWait)
BaseType_t xTimerStartFromISR(TimerHandle_t xTimer xTimer,BaseType_t *pxHigherPriorityTaskWoken)
BaseType_t xTimerStopFromISR(TimerHandle_t xTimer,BaseType_t *pxHigherPriorityTaskWoken)
BaseType_t xTimerChangePeriodFromISR(TimerHandle_t xTimer,TickType_t xNewPeriod,BaseType_t *pxHigherPriorityTaskWoken)
BaseType_t xTimerResetFromISR(TimerHandle_t xTimer,BaseType_t *pxHigherPriorityTaskWoken)
Manage Run-Time Environment
RTOS->Timers
FreeRTOSConfig.h
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/* Software timer definitions. */
#define configUSE_TIMERS 1
#define configTIMER_TASK_PRIORITY configMAX_PRIORITIES-1
#define configTIMER_QUEUE_LENGTH 10
#define configTIMER_TASK_STACK_DEPTH (configMINIMAL_STACK_SIZE * 2)
main.c
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#include "FreeRTOS.h"
#include "task.h"
#include "timers.h"
#include "my_gpio.h"
#include "my_usart.h"
/* 任务句柄 */
static TaskHandle_t AppTaskCreate_Handle = NULL;/* 创建任务句柄 */
/* 句柄 */
static TimerHandle_t Swtmr1_Handle =NULL; /* 软件定时器句柄 */
static TimerHandle_t Swtmr2_Handle =NULL; /* 软件定时器句柄 */
static uint32_t TmrCb_Count1 = 0; /* 记录软件定时器1回调函数执行次数 */
static uint32_t TmrCb_Count2 = 0; /* 记录软件定时器2回调函数执行次数 */
static void AppTaskCreate(void);/* 用于创建任务 */
static void Swtmr1_Callback(void* parameter);
static void Swtmr2_Callback(void* parameter);
static void BSP_Init(void);/* 用于初始化板载相关资源 */
int main(void)
{
BSP_Init();
printf("FreeRTOS-TIMERS!\r\n");
BaseType_t xReturn = pdPASS;/* 定义一个创建信息返回值,默认为pdPASS */
/* 创建 AppTaskCreate 任务 */
xReturn = xTaskCreate((TaskFunction_t )AppTaskCreate, //任务函数
(const char* )"AppTaskCreate", //任务名称
(uint32_t )128, //任务堆栈大小
(void* )NULL, //传递给任务函数的参数
(UBaseType_t )1, //任务优先级
(TaskHandle_t* )&AppTaskCreate_Handle); //任务控制块
if (pdPASS == xReturn)/* 创建成功 */
vTaskStartScheduler(); /* 启动任务,开启调度 */
else
return -1;
while(1); /* 正常不会执行到这里 */
}
/**
* @brief 为了方便管理,所有的任务创建函数都放在这个函数里面
* @param 无
* @retval 无
*/
static void AppTaskCreate(void)
{
taskENTER_CRITICAL(); //进入临界区
Swtmr1_Handle=xTimerCreate((const char* )"AutoReloadTimer",
(TickType_t )1000,/* 定时器周期 1000(tick) */
(UBaseType_t )pdTRUE,/* 周期模式 */
(void* )1,/* 为每个计时器分配一个索引的唯一ID */
(TimerCallbackFunction_t)Swtmr1_Callback);
if(NULL != Swtmr1_Handle)
xTimerStart(Swtmr1_Handle,0); //开启周期定时器
Swtmr2_Handle=xTimerCreate((const char* )"OneShotTimer",
(TickType_t )5000,/* 定时器周期 5000(tick) */
(UBaseType_t )pdFALSE,/* 单次模式 */
(void* )2,/* 为每个计时器分配一个索引的唯一ID */
(TimerCallbackFunction_t)Swtmr2_Callback);
if(NULL != Swtmr2_Handle)
xTimerStart(Swtmr2_Handle,0); //开启周期定时器
vTaskDelete(AppTaskCreate_Handle); //删除AppTaskCreate任务
taskEXIT_CRITICAL(); //退出临界区
}
/**
* @brief Swtmr1_Callback主体
* @param parameter 参数
* @retval 无
*/
static void Swtmr1_Callback(void* parameter)
{
TickType_t tick_num1;
TmrCb_Count1++; /* 每回调一次加一 */
tick_num1 = xTaskGetTickCount(); /* 获取滴答定时器的计数值 */
LED1_TOGGLE;
printf("Swtmr1_Callback %d \n", TmrCb_Count1);
printf("TICK=%d\n", tick_num1);
}
/**
* @brief Swtmr2_Callback主体
* @param parameter 参数
* @retval 无
*/
static void Swtmr2_Callback(void* parameter)
{
TickType_t tick_num2;
TmrCb_Count2++; /* 每回调一次加一 */
tick_num2 = xTaskGetTickCount(); /* 获取滴答定时器的计数值 */
printf("Swtmr2_Callback %d \n", TmrCb_Count2);
printf("TICK=%d\n", tick_num2);
}
/**
* @brief 板级外设初始化,所有板子上的初始化均可放在这个函数里面
* @param 无
* @retval 无
*/
static void BSP_Init(void)
{
/*
* STM32中断优先级分组为4,即4bit都用来表示抢占优先级,范围为:0~15
* 优先级分组只需要分组一次即可,以后如果有其他的任务需要用到中断,
* 都统一用这个优先级分组,千万不要再分组,切忌。
*/
NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 );
/* LED 初始化 */
LED_GPIO_Config();
/* 串口初始化 */
USART_Config();
/* 按键初始化 */
Key_GPIO_Config();
}