一、时间管理
概述
时间管理，提供了一族与时间相关的函数，可以获取/设置系统时钟滴答数（systick）、systick与毫秒单位之间互相转化、按毫秒、墙上时钟等单位进行任务睡眠的功能。
API讲解
编程实例
1、配置每秒钟的系统滴答数TOS_CFG_CPU_TICK_PER_SECOND：
#define TOS_CFG_CPU_TICK_PER_SECOND 1000u
2、编写main.c示例代码：
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "cmsis_os.h"
#include "stdio.h"
#include "tos_k.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
#define STK_SIZE_TASK_DEMO 512
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
k_stack_t stack_task_demo[STK_SIZE_TASK_DEMO];
k_task_t task_demo;
extern void entry_task_demo(void *arg);
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
void entry_task_demo(void *arg)
{
k_time_t ms;
k_tick_t systick, after_systick;
// 因为TOS_CFG_CPU_TICK_PER_SECOND为1000，也就是一秒钟会有1000个systick，因此1000个systick等于1000毫秒。
systick = tos_millisec2tick(2000);
printf("%d millisec equals to %lld ticks\n", 2000, systick);
ms = tos_tick2millisec(1000);
printf("%lld ticks equals to %d millisec\n", (k_tick_t)1000, ms);
systick = tos_systick_get();
printf("before sleep, systick is %lld\n", systick);
tos_sleep_ms(2000);
after_systick = tos_systick_get();
printf("after sleep %d ms, systick is %lld\n", 2000, after_systick);
printf("milliseconds sleep is about: %d\n", tos_tick2millisec(after_systick - systick));
}
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
tos_knl_init();
// 创建静态内存池
(void)tos_task_create(&task_demo, "receiver_higher_prio", entry_task_demo, NULL,
4, stack_task_demo, STK_SIZE_TASK_DEMO, 0);
tos_knl_start();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
} 
3、运行效果
源码链接
