wd_51.c

系统以MSP430F2274单片机为核心

#include<reg52.h>
#define WREN 0x06		//设置写锁存
#define WRDI 0x04		//重新设置写锁存	 
#define RSDR 0x05		//读状态寄存器
#define WRSR 0x01		//写状态寄存器
#define READ 0x03		//在选区的地址区读数据
#define WRITE 0x02		//在选区的地址区写数据（1 to 16BYTES)

sbit WDCS=P1^4;
sbit WDSCK=P1^5;
sbit WDSI=P1^6;
sbit WDSO=P1^7;
sbit LED=P1^0; 

void X5045SpiOpen(void);//打开X5045片选
void X5045SpiClose(void);//关闭X5045片选
unsigned char X5045SpiSend(unsigned char val);//X5045收发SPI协议
void X5045WriteEnable();
void X5045SetTimer(void);//软件使能X5045写操作
void FillWD(void);
unsigned char X5045ReadStatus(void);
void X5045WriteStatus(unsigned char val);
void X5045WriteWait(void);
unsigned int X5045ReadWord(unsigned int addr);
unsigned char X5045ReadByte(unsigned int addr);
void X5045WriteWord(unsigned int addr, unsigned int val);
void X5045WriteByte(unsigned int addr, unsigned char val);


/*************************************************

void X5045SpiOpen(void);//打开X5045片选

*************************************************/
void X5045SpiOpen(void)//打开X5045片选
{
	WDCS=1;
	WDSI=1;
	WDSO=1;
	WDSCK=0;
	WDCS=0;
	
}

/*************************************************

void X5045SpiClose(void);//关闭X5045片选

*************************************************/
void X5045SpiClose(void)//关闭X5045片选
{
	WDCS=1;
	WDSCK=0;	
}

/*************************************************

unsigned char X5045SpiSend(unsigned char val);//X5045收发SPI协议
Dataout		:读取到的WD数据
Datain		:写入WD的数据
Cout		:读取WD的数据进位
Cin			:写入WD的数据进位	
*************************************************/
unsigned char X5045SpiSend(unsigned char val)//X5045收发SPI协议
{
	unsigned char Cout,i,Q=0x80;
	unsigned char Dataout=0x00;
	unsigned char Cin;

	for(i=0;i<8;i++)
		{
		

			Cout=WDSO;

			if(val&Q)
				Cin=1;
			else
				Cin=0;

		
		    WDSI=Cin;
			WDSCK=1;
			;
		
			WDSCK=0;
		
			Dataout|=(Cout<<(7-i));
			
			val<<=1;
	
		}
		
		return Dataout;
			
}
/*******************************8
void EnableWrite(void)
功能：发送WREN，写使能
*********************************/
void X5045WriteEnable()
{
	X5045SpiOpen();
	X5045SpiSend(WREN);
//	WDCS=0;
//	;
	WDCS=1;
	;
	WDCS=0;
	WDSCK=0;
}

/*************************************************
unsigned char X5045SpiSend(unsigned char val)
{
unsigned char i;

  ACC = val;
  for (i = 8; i > 0; i --)
  {
  CY = WDSO;//取数据SO
    _rlca_();//存数据ACC.0读数据ACC.7同时进行
WDSI = CY;//送数据SI
WDSCK = 1;//上升沿打入数据
    _nop_();
WDSCK  = 0;//下降沿读入数据(首次为假动作)
  }
  return ACC;
}


void X5045SetTimer(void);//设置看门狗时间,复位电压
状态寄存器status register :(default =30h)
SR.7=0,SR.6=0
SR.5=WD1;SR.4=WD0//设置看门狗的时间//WD1WD0=10；200ms,WD1WD0=01:600ms,WD1WD0=00;1.4s
SR.3=BL1;SR.2=BL0//设置保护区BL1BL0=10
SR.1=WEL;SR.0=WIP

*************************************************/
void X5045SetTimer(void)//软件使能X5045写操作
{
	unsigned char timer=0x38;//设置为200ms,同时将100h--1ffh段地址保护起来；
	X5045WriteEnable();
	X5045SpiSend(WRSR);
	X5045SpiSend(timer);
	X5045SpiClose();//关闭X5045片选
	
}

/*******************************************
void FillWD(void)
功能:喂狗指令
*********************************************/
void FillWD(void)
{
	WDCS=0;
	WDCS=1;
	WDCS=0;
	WDSCK=0;
}
/**************************************

unsigned char X5045ReadStatus(void)
功能：读状态寄存器
*****************************/

unsigned char X5045ReadStatus(void)
{
	unsigned char val;
	X5045SpiOpen();//打开X5045片选
	X5045SpiSend(RSDR);//发送读X5045状态命令
	val=X5045SpiSend(0xff);//接收X5045状态数据
	X5045SpiClose();//关闭X5045片选
	return val;
}
/*--------------------------------------
    写X5045状态
--------------------------------------*/
void X5045WriteStatus(unsigned char val)
{
	X5045SpiOpen();//打开X5045片选
	X5045WriteEnable();
	X5045SpiSend(WRSR);//发送写X5045状态命令
	X5045SpiSend(val);//发送X5045状态数据
	X5045SpiClose();//关闭X5045片选
}
/*--------------------------------------
    等待X5045写入完成
--------------------------------------*/
void X5045WriteWait(void)
{	unsigned char status;
    do
	{
	status=X5045ReadStatus();
	}
  	while (status & 0x01);//WIP=0 退出
}
/*--------------------------------------
    写X5045一个字节
--------------------------------------*/
void X5045WriteByte(unsigned int addr, unsigned char val)
{
unsigned char temp;
  temp = WRITE;
  if ((addr >> 8) & 0x01) temp |= 8;
  X5045WriteEnable();//使能X5045写操作
  X5045SpiSend(temp);//发送X5045写命令及高位地址
  X5045SpiSend(addr);//发送X5045写低位地址
  X5045SpiSend(val);//发送X5045写数据
  
  X5045WriteWait();//等待本次X5045写入完成
  X5045SpiClose();//关闭X5045片选
}


/*--------------------------------------
    写X5045一个字
--------------------------------------*/
void X5045WriteWord(unsigned int addr, unsigned int val)

{
unsigned char temp;
  temp = WRITE;
  if ((addr >> 8) & 0x01) temp |= 8;
  X5045WriteEnable();//使能X5045写操作
  X5045SpiSend(temp);//发送X5045写命令及高位地址
  X5045SpiSend(addr);//发送X5045写低位地址
  X5045SpiSend(val & 0xff);//发送X5045写低位数据
  X5045SpiSend(val >> 8);//发送X5045写高位数据
  X5045SpiClose();//关闭X5045片选
  X5045WriteWait();//等待本次X5045写入完成

}

/*--------------------------------------
    读X5045一个字节
--------------------------------------*/
unsigned char X5045ReadByte(unsigned int addr)

{
unsigned char val;
  X5045SpiOpen();//打开X5045片选
  val = READ;
  if ((addr >> 8) & 0x01) val |= 8;
  X5045SpiSend(val);//发送X5045读命令及高位地址
  X5045SpiSend(addr&0xff);//发送X5045读低位地址
  val=X5045SpiSend(0xff);//接收X5045读数据
X5045WriteWait();//等待本次X5045写入完成
  X5045SpiClose();//关闭X5045片选
  return val;
}

/*--------------------------------------
    读X5045一个字
--------------------------------------*/
unsigned int X5045ReadWord(unsigned int addr)

{
unsigned char val;
  X5045SpiOpen();//打开X5045片选
  val = READ;
  if ((addr >> 8) & 0x01) val |= 8;
  X5045SpiSend(val);//发送X5045读命令及高位地址
  X5045SpiSend(addr & 0xff);//发送X5045读低位地址
  val=X5045SpiSend(0xff);//接收X5045读低位数据
  addr=X5045SpiSend(0xff);//接收X5045读高位数据
  X5045SpiClose();//关闭X5045片选
  addr <<= 8;
  addr |= val;
  return addr;
}


/**************************************
void main():测试程序
**************************************/

void main()
{	
	unsigned int i;
	unsigned char status,save;
	unsigned char addr=0x03,datain=0x88;
	X5045SetTimer();
	X5045WriteByte(addr, datain);
//	X5045WriteWord(0x0003,0xff88);
//	FillWD();
//	for(i=0;i<1600;i++)
//	LED=1;
//	for(i=0;i<1600;i++)
//	LED=0;
	status=X5045ReadStatus();
	save=X5045ReadByte(addr);
//	data1=X5045ReadWord(0x0003);
	
}