fm31xx.c

FM3104 3116 3164 31256 铁电存储器 DSP2812 I2C读写程序

//***************************************************
#include "DSP28_Device.h"
//**************************************************
struct
{
	unsigned int second;
	unsigned int minute;
	unsigned int hour;
	unsigned int week;
	unsigned int date;
	unsigned int month;	
	unsigned int year;
}RtcRegs;
unsigned int buffer[32];
/////////////////////////////////////////////////////////////
#define IIC_WRITE 0xa0
#define IIC_READ 0xa1
#define REG_READ 0xd1 
#define REG_WRITE 0xd0 
//==================================================
#define WRITEPROTECT 0x0b
#define WDTTIME 0x0a
#define WDTFLAG 0x09
#define YEAR 0x08
#define MOUNTH 0x07
#define DAY 0x06
#define DATE 0x05
#define HOUR 0x04 
#define MINUTE 0x03
#define SECOND 0x02
#define CONTROL 0x01
#define FLAGS 0x00
//================================================
#define		SDA		GpioDataRegs.GPADAT.bit.GPIOA0
#define		SCL		GpioDataRegs.GPADAT.bit.GPIOA2
#define		PFO		GpioDataRegs.GPADAT.bit.GPIOA1
#define 	SDA_INPUT()    {GpioMuxRegs.GPADIR.all &= 0xfffe;}//SDA作为输入口
#define 	SDA_OUTPUT()   {GpioMuxRegs.GPADIR.all |= 0x0001;}//SDA作为输出口
//================================
void Start(void)
{
	EALLOW;
	SDA_OUTPUT()
	SDA = 1;DelayUs(1);
	SCL = 1;DelayUs(1);
	SDA = 0;DelayUs(1);
	EDIS;
}
//=================================
void Stop(void)
{
	EALLOW;
	SDA_OUTPUT()
	SDA = 0;DelayUs(1);
	SCL = 1;DelayUs(1);
	SDA = 1;DelayUs(1);
	EDIS;
}
//=================================
void WriteByte(unsigned int Wdata)//写一个字节（写int型数据的低位字节，高字节忽略）
{
	unsigned int i;

	EALLOW;
	SDA_OUTPUT()
	SCL = 0;DelayUs(1);

	for(i=0x80;i!=0;i>>=1)
	{
		if(Wdata & i) SDA = 1;
		else SDA = 0;
		DelayUs(1);	
		SCL = 1;DelayUs(1);	
		SCL = 0;DelayUs(1);
	}

	EDIS;
}
//==================================
unsigned int ReadByte(void)//读一个字节（放入int型数据的低位字节，高字节清零）
{
	unsigned int i;
	unsigned int RetValue=0;
    EALLOW;
	SDA_INPUT()
	SCL = 0;DelayUs(1);

	for(i=0;i<8;i++)
	{
		RetValue <<= 1;
		SCL = 1;DelayUs(1);	
		RetValue += SDA;DelayUs(1);	
		SCL = 0;DelayUs(1);
	}

	EDIS;
	return RetValue;
}
//====================================
void SlaveAck(void)//查询从机FM31应答信号
{
	unsigned int i=10;
	EALLOW;
	SDA_INPUT()
	SCL = 1;DelayUs(1);
	while(SDA&&(i--));
	{
	    DelayUs(1);
	}
	SCL = 0;DelayUs(1);
	EDIS;
}
//====================================
void MasterAck(void)//主机应答
{
	EALLOW;
	SDA_OUTPUT()
	SDA = 0;DelayUs(1);
	SCL = 1;DelayUs(1);
	SCL = 0;DelayUs(1);
	EDIS;
}
//====================================
void MasterNoAck(void)//主机无应答
{
	EALLOW;
	SDA_OUTPUT()
	SDA = 1;DelayUs(1);
	SCL = 1;DelayUs(1);
	SCL = 0;DelayUs(1);
	EDIS;
}
//====================================
unsigned int ReadFRAM(unsigned int Address)//单字节读
{
	unsigned int RetValue;
	Start();
	WriteByte(IIC_WRITE);
	SlaveAck();
	WriteByte(Address>>8);
	SlaveAck();
	WriteByte(Address & 0x00ff);
	SlaveAck();
	Start();
	WriteByte(IIC_READ);
	SlaveAck();
	RetValue = ReadByte();
	MasterNoAck();
	Stop();
	return RetValue;
}
//=====================================
void WriteFRAM(unsigned int Address,unsigned int Wdata)//单字节写
{
	Start();
	WriteByte(IIC_WRITE);
	SlaveAck();
	WriteByte(Address>>8);
	SlaveAck();
	WriteByte(Address & 0x00ff);
	SlaveAck();
	Wdata &= 0x00ff;
	WriteByte(Wdata);
	SlaveAck();
	Stop();
}
//=====================================
unsigned int ReadReg(unsigned int RegAdd)
{
	unsigned int RetValue;
	Start();
	WriteByte(REG_WRITE);
	SlaveAck();
	RegAdd &= 0x001f;
	WriteByte(RegAdd);
	SlaveAck();
	Start();
	WriteByte(REG_READ);
	SlaveAck();
	RetValue = ReadByte();
	MasterNoAck();
	Stop();
	return RetValue;
}
//=====================================
void WriteReg(unsigned int RegAdd,unsigned int Wdata)
{
	Start();
	WriteByte(REG_WRITE);
	SlaveAck();
	RegAdd &= 0x001f;
	WriteByte(RegAdd);
	SlaveAck();
	WriteByte(Wdata);
	SlaveAck();
	Stop();
}
//====================================
void Read_array(unsigned int Address,unsigned int number/*16bit字数*/)//数据读入buffer
{
	unsigned int i;
	unsigned int RetValue_LSB,RetValue_MSB;
	Start();
	WriteByte(IIC_WRITE);
	SlaveAck();
	WriteByte(Address>>8);
	SlaveAck();
	WriteByte(Address & 0x00ff);
	SlaveAck();

	Start();
	WriteByte(IIC_READ);
	SlaveAck();
	for(i=0;i<number;i++)
	{
		RetValue_LSB = ReadByte();
		MasterAck();
		RetValue_MSB = ReadByte();
		if(i<(number-1))	MasterAck();	
		else MasterNoAck();
		buffer[i] = (RetValue_MSB<<8)+RetValue_LSB;
	}
	Stop();
}
//=====================================
void Write_array(unsigned int Address,unsigned int number/*16bit字数*/)//写buffer数据
{
	unsigned int i;
	Start();
	WriteByte(IIC_WRITE);
	SlaveAck();
	WriteByte(Address>>8);
	SlaveAck();
	WriteByte(Address & 0x00ff);
	SlaveAck();
	for(i=0;i<number;i++)
	{
		WriteByte(buffer[i] & 0x00ff);
		SlaveAck();
		WriteByte(buffer[i]>>8);
		SlaveAck();
	}
	Stop();
}
//=======================================
void Initiation_fm31(void)
{
	WriteReg(WRITEPROTECT,0x00);//无写保护，VTP=2.6V
	WriteReg(WDTTIME,0x1f); 	//看门狗关闭，禁止看门狗计数器
	WriteReg(WDTFLAG,0x0a); 	//清除复位标志，看门狗计数器复位
	WriteReg(CONTROL,0x00); 	//启动时钟
}
//=========================================
void WriteRTC(void)
{
	WriteReg(FLAGS,0x02); 		//允许写操作
	WriteReg(YEAR,0x09); 		//写时间寄存器 09年2月7日星期六12时34分56秒
	WriteReg(MOUNTH,0x02);
	WriteReg(DAY,0x07);
	WriteReg(DATE,0x06);
	WriteReg(HOUR,0x12);
	WriteReg(MINUTE,0x34);
	WriteReg(SECOND,0x56);
	WriteReg(FLAGS,0x00); 		//装载时间寄存器
}
//========================================
void ReadRTC(void) 
{
	unsigned int rtc[7];

	WriteReg(FLAGS,0x01); 		//捕捉时间寄存器，允许读时间操作
	rtc[0] = ReadReg(YEAR);
	rtc[1] = ReadReg(MOUNTH);
	rtc[2] = ReadReg(DAY);
	rtc[3] = ReadReg(DATE);
	rtc[4] = ReadReg(HOUR);
	rtc[5] = ReadReg(MINUTE);
	rtc[6] = ReadReg(SECOND);
	WriteReg(FLAGS,0x00); 		//返回0，准备下次读时间

	RtcRegs.year = ((rtc[0]>>4)*10) + (rtc[0] & 0xf);
	RtcRegs.month = ((rtc[1]>>4)*10) + (rtc[1] & 0xf);
	RtcRegs.date =((rtc[2]>>4)*10) + (rtc[2] & 0xf);
	RtcRegs.week = rtc[3];
	RtcRegs.hour = ((rtc[4]>>4)*10) + (rtc[4] & 0xf);
	RtcRegs.minute =((rtc[5]>>4)*10) + (rtc[5] & 0xf);
	RtcRegs.second = ((rtc[6]>>4)*10) + (rtc[6] & 0xf);


}
//=================================================
//=================================================
//end