#include "fram.h" 
#include "inout.h"

//-------------------------------------------------------------------------------
// 读写函数


//----------------------------------------
// 访问命令

#define FRAM_CMD_WREN		0x06		// 设置写保护
#define FRAM_CMD_WRDI		0x04		// 清除写保护
#define FRAM_CMD_RDSR		0x05		// 读状态寄存器
#define FRAM_CMD_WRSR		0x01		// 写状态寄存器
#define FRAM_CMD_READ		0x03		// 读数据
#define FRAM_CMD_WRITE		0x02		// 写数据


//------------------------------------------------------------------------------------------
// 初始化 Fram
void InitFram(void)
{
	InitFramSpi();
}

//------------------------------------------------------------------------------------------
// 读数据
int ReadFramData(u16 addr, u8 * pBuf, u16 len)
{
	int i;
	if (len != 0 && pBuf != NULL)
	{
		FramNceOn(); 
		FramWriteByte(FRAM_CMD_READ);		// 读命令
		FramWriteByte(HIBYTE(addr));
		FramWriteByte(LOBYTE(addr));
		for (i = 0; i < len; i++)
		{
			*pBuf++ = FramReadByte();
		}
		FramNceOff();

		return len;
	}

	return 0;
}

//------------------------------------------------------------------------------------------
// 写数据
int WriteFramData(u16 addr, u8 * pBuf, u16 len)
{
	int i;

	if (len != 0 && pBuf != NULL)
	{
		FramNceOn(); 
		FramWriteByte(FRAM_CMD_WREN);		// 清除写保护
		FramNceOff();

		FramNceOn(); 
		FramWriteByte(FRAM_CMD_WRITE);		// 写命令
		FramWriteByte(HIBYTE(addr));
		FramWriteByte(LOBYTE(addr));
		for (i = 0; i < len; i++)
		{
			FramWriteByte(*pBuf++);
		}
		FramNceOff();
		return len;
	}
	return 0;
}