TencentOS-tiny 内存管理（十 二）- 动态内存

一、内存管理

1. 动态内存

概述

动态内存管理模块，提供了一套动态管理系统内存的机制，支持用户动态的申请、释放不定长内存块。

API讲解

编程实例

1、在tos_config.h中，配置动态内存组件开关TOS_CFG_MMHEAP_EN：

#define TOS_CFG_MMHEAP_EN 1u

2、在tos_config.h中，配置动态内存池大小：

#define TOS_CFG_MMHEAP_POOL_SIZE 0x2000

3、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)
{
    void *p = K_NULL, *p_aligned = K_NULL;
    int i = 0;

    while (K_TRUE) {
        if (i == 1) {
            p = tos_mmheap_alloc(0x30);
            if (p) {
                printf("alloc: %x\n", (cpu_addr_t)p);
            }
        } else if (i == 2) {
            if (p) {
                printf("free: %x\n", p);
                tos_mmheap_free(p);
            }
        } else if (i == 3) {
            p = tos_mmheap_alloc(0x30);
            if (p) {
                printf("alloc: %x\n", (cpu_addr_t)p);
            }            
        } else if (i == 4) {
            p_aligned = tos_mmheap_aligned_alloc(0x50, 16);
            if (p_aligned) {
                printf("aligned alloc: %x\n", (cpu_addr_t)p_aligned);
                if ((cpu_addr_t)p_aligned % 16 == 0) {
                    printf("%x is 16 aligned\n", (cpu_addr_t)p_aligned);
                } else {
                    printf("should not happen\n");
                }
            }
        } else if (i == 5) {
            p = tos_mmheap_realloc(p, 0x40);
            if (p) {
                printf("realloc: %x\n", (cpu_addr_t)p);
            }
        } else if (i == 6) {
            if (p) {
                tos_mmheap_free(p);
            }
            if (p_aligned) {
                tos_mmheap_free(p_aligned);
            }
        }

        tos_task_delay(1000);
        ++i;
    }
}
/* 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();
	(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 */
}

4、运行效果：

源码链接：Git