概述
本篇只要介绍这么使用STM32CubeMx工具添加RT-Thread操作系统组件，码代码的IDE是keil。介绍单线程SRAM静态内存使用。如果还不知道，这么使用STM32CubeMx工具添加RT-Thread操作系统组件，请移步到《基于 STM32CubeMX 添加 RT-Thread 操作系统组件(一）- 详细介绍操作步骤》文章阅读。好了，喝杯茶先^_^，继续前行。上一篇介绍关于《双向链表》
在实现这个功能之前，先去RT-Thread的源码仓库中获取，该文件在 rtthread--master\examples\kernel 路径下，名字叫cpuusage.c。
链接如下：
github
码云
一、STM32CubeMx配置
CubeMx参照上一篇文章介绍来配置即可，这里就不再做讲解了。
二、KEIL IDE
- 在keil 工程项目视图，Application/User文件夹，打开下载好源码，找到cpuusage.c文件，添加到工程中来，如下代码：
#include <rtthread.h> #include <rthw.h> #include "cpuusage.h" #define CPU_USAGE_CALC_TICK 1000 #define CPU_USAGE_LOOP 100 static rt_uint8_t cpu_usage_major = 0, cpu_usage_minor= 0; static rt_uint32_t total_count = 0; static void cpu_usage_idle_hook() { rt_tick_t tick; rt_uint32_t count; volatile rt_uint32_t loop; if (total_count == 0) { /* get total count */ rt_enter_critical(); tick = rt_tick_get(); while(rt_tick_get() - tick < CPU_USAGE_CALC_TICK) { total_count ++; loop = 0; while (loop < CPU_USAGE_LOOP) loop ++; } rt_exit_critical(); } count = 0; /* get CPU usage */ tick = rt_tick_get(); while (rt_tick_get() - tick < CPU_USAGE_CALC_TICK) { count ++; loop = 0; while (loop < CPU_USAGE_LOOP) loop ++; } /* calculate major and minor */ if (count < total_count) { count = total_count - count; cpu_usage_major = (count * 100) / total_count; cpu_usage_minor = ((count * 100) % total_count) * 100 / total_count; } else { total_count = count; /* no CPU usage */ cpu_usage_major = 0; cpu_usage_minor = 0; } } void cpu_usage_get(rt_uint8_t *major, rt_uint8_t *minor) { RT_ASSERT(major != RT_NULL); RT_ASSERT(minor != RT_NULL); *major = cpu_usage_major; *minor = cpu_usage_minor; } void cpu_usage_init() { /* set idle thread hook */ rt_thread_idle_sethook(cpu_usage_idle_hook); }
- 在Application/User文件夹，新建cpuusage.h文件，并添加如下代码：
#ifndef __CPUUSAGE_H__ #define __CPUUSAGE_H__ #include <rtthread.h> #include <rthw.h> /* 获取 cpu 利用率 */ void cpu_usage_init(void); void cpu_usage_get(rt_uint8_t *major, rt_uint8_t *minor); #endif
- 在Application/User文件夹，新建app_rt_thread.c文件，并添加如下代码：
#include "rtthread.h" #include "main.h" #include "stdio.h" #include <string.h> #include "cpuusage.h" /* 定义线程控制块 */ static rt_thread_t led1_thread = RT_NULL; static rt_thread_t get_cpu_use_thread = RT_NULL; /* 函数声明 */ static void led1_thread_entry(void* parameter); static void get_cpu_use_thread_entry(void* parameter); int MX_RT_Thread_Init(void) { cpu_usage_init(); rt_kprintf("This is an RTT-CPU utilization statistics experiment\r\n"); led1_thread = /* 线程控制块指针 */ rt_thread_create( "led1", /* 线程名字 */ led1_thread_entry, /* 线程入口函数 */ RT_NULL, /* 线程入口函数参数 */ 512, /* 线程栈大小 */ 3, /* 线程的优先级 */ 20); /* 线程时间片 */ /* 启动线程，开启调度 */ if (led1_thread != RT_NULL) rt_thread_startup(led1_thread); else return -1; get_cpu_use_thread = /* 线程控制块指针 */ rt_thread_create( "get_cpu_use", /* 线程名字 */ get_cpu_use_thread_entry, /* 线程入口函数 */ RT_NULL, /* 线程入口函数参数 */ 512, /* 线程栈大小 */ 5, /* 线程的优先级 */ 20); /* 线程时间片 */ if (get_cpu_use_thread != RT_NULL) rt_thread_startup(get_cpu_use_thread); else return -1; } /* ************************************************************ * 线程定义 ********************************************************* */ static void led1_thread_entry(void* parameter) { rt_uint16_t i; while (1) { HAL_GPIO_TogglePin(LED1_GPIO_Port, LED1_Pin); /* 模拟占用 CPU 资源，修改数值作为模拟测试 */ for (i = 0; i < 10000; i++); rt_thread_delay(500); /* 延时 5 个 tick */ rt_kprintf("CPU utilization \r\n"); } } static void get_cpu_use_thread_entry(void* parameter) { rt_uint8_t major,minor; while (1) { /* 获取 CPU 利用率数据 */ cpu_usage_get(&major,&minor); /* 打印 CPU 利用率 */ rt_kprintf("CPU utilization = %d.%d%\r\n",major,minor); rt_thread_delay(1000); /* 延时 1000 个 tick */ } } - 在main.c文件添加如下代码：
/* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" #include "usart.h" #include "gpio.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ extern int MX_RT_Thread_Init(void); /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* 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 */ MX_RT_Thread_Init(); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } /* USER CODE END 3 */ } - 自定义rt_hw_console_output()函数，在kservice.c文件添加中（重映射串口控制台到 rt_kprintf 函数）代码：
#include "usart.h" . . . RT_WEAK void rt_hw_console_output(const char *str) { /* empty console output */ /* 进入临界段 */ rt_enter_critical(); /* 直到字符串结束 */ while (*str!='\0') { /* 换行 */ if (*str=='\n') { HAL_UART_Transmit(&huart1,(uint8_t *)'\r',1,1000); } HAL_UART_Transmit(&huart1,(uint8_t *)(str++),1,1000); } /* 退出临界段 */ rt_exit_critical(); }
- 运行结果
源码：git