am29lv160d Flash相关操作

最新推荐文章于 2019-01-08 00:00:09 发布

极简Qt

最新推荐文章于 2019-01-08 00:00:09 发布

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分类专栏： Linux/嵌入式文章标签： flash

本文链接：https://blog.youkuaiyun.com/BeyondHaven/article/details/6708548

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本文介绍了一种针对Flash存储器的操作方法，包括读取ID、解锁快写功能、擦除整个芯片或特定扇区以及进行写操作等关键功能的实现。

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#define FLASH_BASE 0x08000000
//读取一个ID  
unsigned short ReadID()
{
	unsigned short *BaseAdd = (unsigned short *)FLASH_BASE;
	*(BaseAdd + 0x555) = 0xaa;
	*(BaseAdd + 0x2aa) = 0x55;
	*(BaseAdd + 0x555) = 0x90;
	return (*(BaseAdd + 1));
}

//开启快写功能
int Unlock_Bypass(void)
{
	unsigned short *BaseAdd = (unsigned short *)FLASH_BASE;
	*(BaseAdd + 0x555) = 0xaa;
	*(BaseAdd + 0x2aa) = 0x55;
	*(BaseAdd + 0x555) = 0x20;
	return 1;
}

//开启快写功能复位
int Unlock_Bypass_ReSet()
{
	unsigned short *BaseAdd = (unsigned short *)FLASH_BASE;
	*(BaseAdd + 0x555) = 0x90;
	*(BaseAdd + 0x555) = 0x20;
	return 1;
}

//擦除全部
int Chip_Erase(void)
{
	unsigned short *BaseAdd = (unsigned short *)FLASH_BASE;
	*(BaseAdd + 0x555) = 0xaa;
	*(BaseAdd + 0x2aa) = 0x55;
	*(BaseAdd + 0x555) = 0x80;
	*(BaseAdd + 0x555) = 0xaa;
	*(BaseAdd + 0x2aa) = 0x55;
	*(BaseAdd + 0x555) = 0x10;

	int i = 0;
	do 
	{
		i ++;
		if(i > 0x100000)//超时
			return 0;
	}while((*BaseAdd & 0x0020) == 0);

	if (*BaseAdd != 0xffff)
	{
		return 0;
	}
	return 1;
}

//擦除一段
int Sector_Erase(int addr)
{
	int i = 0;
	unsigned short * BaseAdd = (unsigned short *)FLASH_BASE;
	unsigned short tmpData;
	*(BaseAdd + 0x555) = 0xaa;
	*(BaseAdd + 0x2aa) = 0x55;
	*(BaseAdd + 0x555) = 0x80;
	*(BaseAdd + 0x555) = 0xaa;
	*(BaseAdd + 0x2aa) = 0x55;
	*(BaseAdd + 0x555) = 0x30;

	do
	{
		tmpData = *(BaseAdd + addr);
		i ++;
		if(i > 0x100000)
		{
			return 0;
		}
	}while((tmpData & 0x0020) == 0);

	if (tmpData != 0xffff)
	{
		return 0;
	}
	return 1;
}

//写操作
int WriteInfo(int address, unsigned short mydata)
{
	unsigned short *BaseAdd = (unsigned short *)FLASH_BASE;
	unsigned short tmpData;
	*(BaseAdd + 0x555) = 0xaa;
	*(BaseAdd + 0x2aa) = 0x55;
	*(BaseAdd + 0x555) = 0xa0;
	*(BaseAdd + address) = mydata;
	int i = 0;
	do
	{
		tmpData = *(BaseAdd + address);
		if (((tmpData^mydata) & 0x0080)== 0)
		{
			return 1;
		}
		i ++;
		if (i > 0x100000)
		{
			return 0;
		}
	}while ((tmpData & 0x0020) == 0);
	tmpData = *(BaseAdd + address);
	if ((tmpData^mydata) & 0x0080 != 0)
	{
		return 0;
	}
	return 1;
}

//快速写操作
int FastWrite(int addr, unsigned short myData)
{
	int i = 0;
	unsigned short *BaseAdd = (unsigned short *)FLASH_BASE;
	unsigned short tmpData;
	*(BaseAdd + 0xaaa) = 0xa0;

	*(BaseAdd + addr) = myData;
	do
	{
		tmpData = *(BaseAdd + addr);
		if (((tmpData^myData) & 0x0080) == 0)
		{
			return 1;
		}
		i ++;
		if (i > 0x100000)
		{
			return 0;
		}
	}while(tmpData & 0x0020 == 0);

	tmpData = *(BaseAdd + addr);
	if ((tmpData^myData) & 0x0080 != 0)
	{
		return 0;
	}
	return 1;
}