drv5045.h

基于spi总线的c51单片机x5045驱动程序代码

#define WREN  0x06
#define WRDI  0x04
#define RDSR  0x05
#define WRSR  0x01
#define READ  0x03
#define WRITE 0x02
#define WIP   0x01

sbit EEPROMCS      = P1^0;
sbit EEPROMSCK     = P1^1;
sbit EEPROMSI      = P1^2;
sbit EEPROMSO      = P1^3;
sbit EEPROMWP	   = P1^4;
sfr  WDTRST        = 0xA6;

void X5045SpiOpen(void);//打开X5045片选
void X5045SpiClose(void);//关闭X5045片选
void X5045WriteEnable(void);//软件使能X5045写操作
void X5045WriteDisable(void);//软件禁止X5045写操作
unsigned char X5045SpiSend(unsigned char val);//X5045收发SPI协议
void X5045WriteByte(unsigned int addr,unsigned char val);//写X5045一个字节
void X5045WriteWord(unsigned int addr,unsigned int val);//写X5045一个字
unsigned char X5045ReadByte(unsigned int addr);//读X5045一个字节
unsigned int X5045ReadWord(unsigned int addr);//读X5045一个字
unsigned char X5045ReadStatus(void);//读X5045状态
void X5045WriteStatus(unsigned char val);//写X5045状态
void X5045WriteWait(void);//等待X5045写入完成

/*--------------------------------------
       打开X5045片选
--------------------------------------*/
void X5045SpiOpen(void)
{
    EEPROMCS      = 1;//WDT
    EEPROMSCK     = 0;
    EEPROMSO      = 1;//SO=SI=1 释放总线
	EEPROMSI      = 1;
    EEPROMCS      = 0;//WDT;打开X5045片选CS
}
/*--------------------------------------
      关闭X5045片选
--------------------------------------*/
void X5045SpiClose(void)
{
    EEPROMCS      = 1;//关闭X5045片选CS
    EEPROMSI      = 1;//SO=SI=1 释放总线
	EEPROMSO      = 1;
    EEPROMSCK     = 0;
}

/*--------------------------------------
      软件使能X5045写操作
--------------------------------------*/

void X5045WriteEnable(void)
{
    X5045SpiOpen();//打开X5045片选
    EEPROMWP = 1;//硬件使能X5045写操作
    X5045SpiSend(WREN);//发送使能X5045写命令
    X5045SpiClose();//关闭X5045片选
}


/*--------------------------------------
      软件禁止X5045写操作
--------------------------------------*/
void X5045WriteDisable(void)
{
    X5045SpiOpen();//打开X5045片选
    X5045SpiSend(WRDI);//发送禁止X5045写命令
    EEPROMWP = 0;//硬件禁止X5045写操作
    X5045SpiClose();//关闭X5045片选
}

/*--------------------------------------
      X5045收发SPI协议
--------------------------------------*/
unsigned char X5045SpiSend(unsigned char val)
{
unsigned char i;
    WDTRST = 0x1e;//89s52内狗
    WDTRST = 0xe1;//89s52内狗
    ACC = val;
    for (i = 8; i > 0; i --)
    {
    CY = EEPROMSO;//取数据SO
      _rlca_();//存数据ACC.0读数据ACC.7同时进行
	EEPROMSI = CY;//送数据SI
	EEPROMSCK = 1;//上升沿打入数据
      _nop_();
	EEPROMSCK    = 0;//下降沿读入数据(首次为假动作)
    }
    return ACC;
}

/*--------------------------------------
      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
    X5045SpiOpen();//打开X5045片选
    X5045SpiSend(temp);//发送X5045写命令及高位地址
    X5045SpiSend(addr & 0xff);//发送X5045写低位地址
    X5045SpiSend(val);//发送X5045写数据
    X5045SpiClose();//关闭X5045片选
    X5045WriteWait();//等待本次X5045写入完成
    X5045WriteDisable();//禁止X5045写操作
}


/*--------------------------------------
      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
    X5045SpiOpen();//打开X5045片选
    X5045SpiSend(temp);//发送X5045写命令及高位地址
    X5045SpiSend(addr & 0xff);//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
    X5045WriteDisable();//禁止X5045写操作
}

/*--------------------------------------
      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
    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;
}
/*--------------------------------------
      读X5045状态
--------------------------------------*/
unsigned char X5045ReadStatus(void)
{
	unsigned char val;
    X5045SpiOpen();//打开X5045片选
    X5045SpiSend(RDSR);//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
    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)
{
    while (X5045ReadStatus() & WIP);//WIP=0 退出
}