A memory management
- Dynamic Memory
Outline
Dynamic memory management module that provides a mechanism for dynamic memory management system to support dynamic user application, the release of variable length memory block.
API to explain
Programming Example
1, in tos_config.h, the dynamic memory is configured switch assembly TOS_CFG_MMHEAP_EN:
#define TOS_CFG_MMHEAP_EN 1u
2, in tos_config.h, configure dynamic memory pool size:
#define TOS_CFG_MMHEAP_POOL_SIZE 0x2000
3, the preparation of the sample code main.c:
/* 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, operating results:
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