rt thraed stm32使用外部SRAM，我是根据这两篇文章弄出来的

发布于 2021-12-04 14:23:16 浏览：1926 订阅该版

外部SRAM cubemx配置
https://www.codetd.com/article/11600726

外部SRAM rt studio 设置
https://blog.skyate.com/index.php/2021/09/25/rt-thread-%EF%BC%881%EF%BC%89-%E6%B7%BB%E5%8A%A0%E5%A4%96%E9%83%A8%E5%86%85%E5%AD%98%E5%88%B0%E5%86%85%E5%AD%98%E7%AE%A1%E7%90%86/

测试代码
```
#define RAM_HEAP_EX_START           (0xC0000000)
#define RAM_HEAP_EX_SIZE            (32x1024x1024)
#define RAM_HEAP_EX_END             (RAM_HEAP_EX_START + RAM_HEAP_EX_SIZE)
struct rt_memheap ex_ram_heap;
int DRV_EX_SDRAM_Register(void)
{
    //注册内存堆到内存堆管理
    rt_memheap_init(&ex_ram_heap,"SDRAM EX",(void*)RAM_HEAP_EX_START,RAM_HEAP_EX_SIZE);

return 0;
}

#define MALLOC_SIZE                 1024

int malloc_test(char argc ,char *argv[])
{
        int cnt = 0;

char *malloc_buf;
        char *temp_buf;

if(argc < 2)
        {
            rt_kprintf("plsase use formate \"malloc_test x\"\r\n");
            return -1;
        }

cnt = atoi(argv[1]);
        rt_kprintf("%s\r\n",argv[0]);

malloc_buf = (char *)rt_memheap_alloc(&ex_ram_heap,MALLOC_SIZE*cnt);
        temp_buf = malloc_buf;
        if (malloc_buf == RT_NULL)
        {
                rt_kprintf("rt_malloc fail\r\n");
                return -1;
        }
        for(int j = 0; j < MALLOC_SIZE; j++)
        {
                *malloc_buf++ = 0x5a;
        }

for(int k = 0; k < MALLOC_SIZE; k++)
        {
                if(*temp_buf++ != 0x5a)
                {
                        rt_kprintf("mem test failed :\r\n");
                }
        }

rt_kprintf("rt_malloc return\r\n");

return 1;
}

MSH_CMD_EXPORT(malloc_test, test how many memory can be malloc);
```

实验结果
![image.png](https://oss-club.rt-thread.org/uploads/20211204/206c9bfafa2c55b4bb1e72bdeafe84c5.png.webp)