SRAM

rt_memheap_init 初始化外部sram 死机

发布于 2021-07-21 11:05:39 浏览：1497 订阅该版

使用RTThreadNano 版本，  board.c中的代码
```c
/*
 * Copyright (c) 2006-2019, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2021-05-24                  the first version
 */

#include <rthw.h>
#include <rtthread.h>

#include "main.h"

#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
/*
 * Please modify RT_HEAP_SIZE if you enable RT_USING_HEAP
 * the RT_HEAP_SIZE max value = (sram size - ZI size), 1024 means 1024 bytes
 */
#define RT_HEAP_SIZE (15*1024)
static rt_uint8_t rt_heap[RT_HEAP_SIZE];

RT_WEAK void *rt_heap_begin_get(void)
{
    return rt_heap;
}

RT_WEAK void *rt_heap_end_get(void)
{
    return rt_heap + RT_HEAP_SIZE;
}

#elif defined (RT_USING_USER_MAIN)&&defined(RT_USING_MEMHEAP)
 #define RT_HEAP_RAM_SIZE (15*1024)
static rt_uint8_t rt_heap_ram[RT_HEAP_RAM_SIZE];
#define RT_HEAP_EXRAM_SIZE (800*1024)
static rt_uint8_t rt_heap_exram[RT_HEAP_EXRAM_SIZE]  __attribute((used,section("EXRAM")));

struct rt_memheap  Strucmem;

#endif

void SysTick_Handler(void)
{
    rt_interrupt_enter();
    
    rt_tick_increase();

rt_interrupt_leave();
}

/**
 * This function will initial your board.
 */
void rt_hw_board_init(void)
{
    extern void SystemClock_Config(void);
    
    HAL_Init();
    SystemClock_Config();
    SystemCoreClockUpdate();
    /* 
     * 1: OS Tick Configuration
     * Enable the hardware timer and call the rt_os_tick_callback function
     * periodically with the frequency RT_TICK_PER_SECOND. 
     */
    HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/RT_TICK_PER_SECOND);

/* Call components board initial (use INIT_BOARD_EXPORT()) */
#ifdef RT_USING_COMPONENTS_INIT
    rt_components_board_init();
#endif

#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
    rt_system_heap_init(rt_heap_begin_get(), rt_heap_end_get());

#elif defined (RT_USING_USER_MAIN)&&defined(RT_USING_MEMHEAP)
    rt_memheap_init(&Strucmem,"memram", rt_heap_ram, RT_HEAP_RAM_SIZE);
    //rt_memheap_init(&Strucmem,"memexram", rt_heap_exram, RT_HEAP_EXRAM_SIZE);

#endif
}

#ifdef RT_USING_CONSOLE

static UART_HandleTypeDef UartHandle;
static int uart_init(void)
{
    /* TODO: Please modify the UART port number according to your needs */
    UartHandle.Instance = USART1;
    UartHandle.Init.BaudRate = 115200;
    UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
    UartHandle.Init.StopBits = UART_STOPBITS_1;
    UartHandle.Init.Parity = UART_PARITY_NONE;
    UartHandle.Init.Mode = UART_MODE_TX_RX;
    UartHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    UartHandle.Init.OverSampling = UART_OVERSAMPLING_16;

if (HAL_UART_Init(&UartHandle) != HAL_OK)
    {
        while (1);
    }
    return 0;
}
INIT_BOARD_EXPORT(uart_init);

void rt_hw_console_output(const char *str)
{
    rt_size_t i = 0, size = 0;
    char a = '\r';

__HAL_UNLOCK(&UartHandle);

size = rt_strlen(str);

for (i = 0; i < size; i++)
    {
        if (*(str + i) == '\n')
        {
            HAL_UART_Transmit(&UartHandle, (uint8_t *)&a, 1, 1);
        }
        HAL_UART_Transmit(&UartHandle, (uint8_t *)(str + i), 1, 1);
    }
}
#endif

#ifdef RT_USING_FINSH
char rt_hw_console_getchar(void)
{
    /* Note: the initial value of ch must < 0 */
    int ch = -1;

if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_RXNE) != RESET)
    {
        ch = UartHandle.Instance->DR & 0xff;
    }
    else
    {
        rt_thread_mdelay(10);
    }
    return ch;
}
#endif
```

其中只要一把屏蔽的 `//rt_memheap_init(&Strucmem,"memexram", rt_heap_exram,`  
打开，即只要一初始化片外sram 就会死机，我该如何查呢 ？
其中，片外sram 使用的fsmc 驱动