USB CDC and FreeRTOS

Hi @MK..1 

ST USB middleware is not explicitly using malloc() and free(), but it is crucial to configure it to use static memory allocation to ensure thread safety.

/**
 * @brief Static single allocation.
 * @param size: Size of allocated memory
 * @retval None
 */
void *USBD_static_malloc(uint32_t size)
{
 static uint32_t mem[(sizeof(USBD_CDC_HandleTypeDef)/4)+1];/* On 32-bit boundary */
 return mem;
}

/**
 * @brief Dummy memory free
 * @param p: Pointer to allocated memory address
 * @retval None
 */
void USBD_static_free(void *p)
{

}