关于利用0x68000000作为扩展sram？

发布于 2020-07-15 15:44:02 浏览：2189 订阅该版

小鳄鱼 2020-07-17

rt-thread脑残粉

0904love 2020-07-20

这家伙很懒，什么也没写！

stm32f407的板子，外部sram经过测试也是可以用的，测试主要代码如下：
unsigned int data;
void get_data(unsigned int n)
{
	data = n;
}

int FSMC_SRAM_ReadBuffer(unsigned char *pBuffer, unsigned int ReadAddr, unsigned int byte)
{
	int temp_sum = 0;	
	for (int i = 0; i < byte; i++)
	{
		data = *(volatile unsigned char *)(Bank1_SRAM3_ADDR + ReadAddr);
		temp_sum += data;
		ReadAddr++;
	}
	rt_kprintf(" %d\n", temp_sum);
	return temp_sum;
}

int FSMC_SRAM_WriteBuffer(unsigned char *pBuffer, unsigned int WriteAddr, unsigned int byte)
{
	int sum = 0;
	for(int i = 0; i < byte; i++)
	{
		get_data(i);
		*(volatile unsigned char *)(Bank1_SRAM3_ADDR + WriteAddr) = data;
		sum += data;
		WriteAddr++;
		while(i == 255)
		{
			i = 0;
			byte = byte - 255;
		}
	}
	rt_kprintf(" %d\n", sum);
	return sum;
}

static void sram_test( unsigned int byte)
{
	unsigned int sum = 0;
	unsigned int data_sum = 0;
	unsigned int temp_sum = 0;

sum = FSMC_SRAM_WriteBuffer(data, 0, byte);
	temp_sum = FSMC_SRAM_ReadBuffer(data, 0, byte);

if (sum == temp_sum)
	{
		rt_kprintf("read sram success\n");
	}
	if (sum != temp_sum)
	{
		rt_kprintf("read sram failed\n");
	}
}
测试结果如下：
![QQ截图20200720163032.png](/uploads/20200720/eaec6a6ac06fb4335f9c6404f00b3d61.png)