TencentOS-tiny 内存管理（十 三）- 静态内存

一、内存管理

1. 静态内存

概述

静态内存管理模块，提供了一套管理静态内存块的机制，支持用户申请、释放定长的内存块。

API讲解

创建静态内存池接口：

k_err_t tos_mmblk_pool_create(k_mmblk_pool_t *mbp, void *pool_start, size_t blk_num, size_t blk_size);

这里详细讲解此api参数意义：

• mbp

  静态内存池句柄。

• pool_start

  静态内存池起始地址。

• blk_num

  内存池将要划分的内存块个数。

• blk_size

  每个内存块的大小。

编程实例

1、在tos_config.h中，配置静态内存组件开关TOS_CFG_MMBLK_EN：

#define TOS_CFG_MMBLK_EN 1u

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 */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define STK_SIZE_TASK_DEMO      512

k_stack_t stack_task_demo[STK_SIZE_TASK_DEMO];

k_task_t task_demo;

#define MMBLK_BLK_NUM       5
#define MMBLK_BLK_SIZE      0x20

k_mmblk_pool_t mmblk_pool;

// 需要管理的静态内存池
uint8_t mmblk_pool_buffer[MMBLK_BLK_NUM * MMBLK_BLK_SIZE];

// 记录从内存池中分配到的地址
void *p[MMBLK_BLK_NUM] = { K_NULL };

extern void entry_task_demo(void *arg);

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
void entry_task_demo(void *arg)
{
    void *p_dummy = K_NULL;
    k_err_t err;
    int i = 0;

    printf("mmblk_pool has %d blocks, size of each block is 0x%x\n", 5, 0x20);
    // 从内存池中获取所有的block
    for (; i < MMBLK_BLK_NUM; ++i) {
        err = tos_mmblk_alloc(&mmblk_pool, &p[i]);
        if (err == K_ERR_NONE) {
            printf("%d block alloced: 0x%x\n", i, p[i]);
        } else {
            printf("should not happen\n");
        }
    }

    // 前文逻辑已经将所有可用block分配完毕，继续分配会返回K_ERR_MMBLK_POOL_EMPTY错误码
    err = tos_mmblk_alloc(&mmblk_pool, &p_dummy);
    if (err == K_ERR_MMBLK_POOL_EMPTY) {
        printf("blocks exhausted, all blocks is alloced\n");
    } else {
        printf("should not happen\n");
    }

    // 将前文分配得到的所有block归还到池中
    for (i = 0; i < MMBLK_BLK_NUM; ++i) {
        err = tos_mmblk_free(&mmblk_pool, p[i]);
        if (err != K_ERR_NONE) {
            printf("should not happen\n");
        }
    }
    // 前文的归还动作中已经将所有的block归还到池中，继续规范会返回K_ERR_MMBLK_POOL_FULL错误码
    err = tos_mmblk_free(&mmblk_pool, p[0]);
    if (err == K_ERR_MMBLK_POOL_FULL) {
        printf("pool is full\n");
    } else {
        printf("should not happen\n");
    }
}
/* 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
	tos_mmblk_pool_create(&mmblk_pool, mmblk_pool_buffer, MMBLK_BLK_NUM, MMBLK_BLK_SIZE);
	(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 */
}

（注：如果程序没有跑起来，去看看是不是等级优化设置导致的，把它改为Level 0 即可） 

3、运行效果:

源码链接：Git