SD2400 AVR程序.doc

/-/ SD24XX读写演示程序，此程序仅供参考/ e-mail: FAE/ TEL 2014/07/01/-#include #include #define uchar unsigned char#define uint unsigned int#define ulong unsigned long/数据sda的位设置#define sda_in DDRC &= (1 PC1) /数据设置输入#define sda_out DDRC |= (1 PC1) /数据设置输出#define sda_setb PORTC |= (1 PC1) /数据拉高 #define sda_clr PORTC &= (1 PC1) /数据拉低 #define sda_r PINC & (1 PC1) /数据读取 /时钟scl的位设置#define scl_in DDRC &= (1 PC0) /时钟设置输入#define scl_out DDRC |= (1 PC0) /时钟设置输出#define scl_setb PORTC |= (1 PC0) /时钟拉高 #define scl_clr PORTC &= (1 PC0) /时钟拉低 #define scl_r PINC & (1 0;time-) for(i=0;i1571;i+); asm(nop); asm(nop); asm(nop);void delay_1us(void) /11.0592M, 1us延时函数 asm(nop); void delay_us(uint time) /11.0592M, Nus延时函数 uint i; for (i=0;itime;i+) asm(nop); /= /*开启SD24XX的I2C总线*/uchar I2CStart(void) sda_out;scl_out;delay_1us(); sda_setb;scl_setb;delay_us(5);sda_in;delay_us(5);if(!sda_r)return false;/SDA线为低电平则总线忙,退出sda_out;delay_1us();sda_clr;delay_us(10);sda_in; delay_us(10);while(sda_r)return false;/SDA线为高电平则总线出错,退出scl_clr;delay_us(5);return true;/*关闭SD24XX的I2C总线*/void I2CStop(void) scl_out;sda_out;delay_1us();sda_clr;delay_1us();scl_clr;delay_us(5);scl_setb;delay_us(2);sda_setb;/*发送 ACK*/void I2CAck(void) scl_out;sda_out;delay_1us();sda_clr;delay_1us();scl_clr;delay_us(5);scl_setb;delay_us(5);scl_clr;/*发送NO ACK*/void I2CNoAck(void) scl_out;sda_out;delay_1us();sda_setb;delay_1us();scl_clr;delay_us(5);scl_setb;delay_us(5);scl_clr;/*读取ACK信号*uchar I2CWaitAck(void) /返回为:1=有ACK,0=无ACKuchar errtime=255;scl_out;sda_in;delay_1us();scl_clr;delay_us(5);scl_setb;delay_1us();sda_in;delay_1us();while(sda_r)errtime-;delay_1us();if(!errtime)delay_us(10);scl_clr;return false; scl_clr;return true;/*MCU向SD24XX发送一个字节*/ void I2CSendByte(uchar demand) /数据从高位到低位uchar bd=8; sda_out;scl_out;while(bd-)scl_clr; delay_1us;if(demand&0x80) sda_setb; else sda_clr; demand=1;delay_us(3);scl_setb;delay_us(3);scl_clr; /*MCU从SD24XX读入一字节*/uchar I2CReceiveByte(void) /数据从高位到低位/uchar bl=8;uchar ddata=0;scl_out;delay_1us();delay_1us();sda_in; /端口切换为输入状态！sda_setb; /有的单片机需要加这句，如果不需要可以删掉delay_1us();while(bl-)ddata=1; /数据从高位开始读取delay_1us();scl_clr;delay_us(5); /从高位开始 ddata|=SDA;ddatasecond=I2CReceiveByte();I2CAck();psRTC-minute=I2CReceiveByte();I2CAck();psRTC-hour=I2CReceiveByte();I2CAck();psRTC-week=I2CReceiveByte();I2CAck();psRTC-day=I2CReceiveByte();I2CAck();psRTC-month=I2CReceiveByte();I2CAck();psRTC-year=I2CReceiveByte();I2CNoAck();/读时间完成，发送NoAckI2CStop();returntrue;/*写SD24XX实时数据寄存器*/uchar I2CWriteDate(S_TimeSetRTC)/写时间操作要求一次对实时时间寄存器(00H06H)依次写入， /不可以单独对7个时间数据中的某一位进行写操作,否则可能会引起时间数据的错误进位. /要修改其中某一个数据 , 应一次性写入全部 7 个实时时钟数据.S_Time *psRTC; psRTC=&SetRTC;WriteTimeOn();/使能，开锁if(!I2CStart()return false;I2CSendByte(RTC_Address); if(!I2CWaitAck()I2CStop(); return false;I2CSendByte(0x00);/设置写起始地址 I2CWaitAck();I2CSendByte(psRTC-second);/second I2CWaitAck();I2CSendByte(psRTC-minute);/minute I2CWaitAck();I2CSendByte(psRTC-hour|0x80);/hour ,同时设置小时寄存器最高位（0：为12小时制，1：为24小时制）I2CWaitAck();I2CSendByte(psRTC-week);/week I2CWaitAck();I2CSendByte(psRTC-day);/day I2CWaitAck();I2CSendByte(psRTC-month);/month I2CWaitAck();I2CSendByte(psRTC-year);/year I2CWaitAck();I2CStop();WriteTimeOff();/使能，关锁returntrue;/*设置SD24XX报警中断演示程序演示*/void WriteALARM(void)/设置报警时间：2015年2月14日 8：00/只有设置未来的时间才有效WriteTimeOn();I2CWriteOneByte(RTC_Address,0x09,0x08);/8时I2CWriteOneByte(RTC_Address,0x0b,0x14);/14日I2CWriteOneByte(RTC_Address,0x0c,0x02);/02月I2CWriteOneByte(RTC_Address,0x0d,0x15);/15年I2CWriteOneByte(RTC_Address,0x0e,0x74);/设置报警允许（使能年、月、日、小时报警）I2CWriteOneByte(RTC_Address,0x10,0x92);/设置INT中断选通（INTS1，INTS0），及报警中断总允许位（INTAE）WriteTimeOff();/*关闭SD24XX报警中断程序*/void ClrALARM(void)/关闭报警中断WriteTimeOn();I2CWriteOneByte(RTC_Address,0x10,0x90);WriteTimeOff();/*设置SD24XX倒计时中断演示*/void SetDjs(void)/设置倒计时中断WriteTimeOn();I2CWriteOneByte(RTC_Address,0x10,0x0f);/先清倒计时中断总允许位（INTDE）I2CWriteOneByte(RTC_Address,0x10,0xf4);/设置周期性中断（IM=1）INT中断选通（INTS1，INTS0），配置倒计时中断总允许位（INTDE）I2CWriteOneByte(RTC_Address,0x11,0x30);/选择定时器频率源（TDS1、TDS0）为1/60HZI2CWriteOneByte(RTC_Address,0x13,0x05);/倒计时初值寄存器，设置8位倒计时计数初值（5min）WriteTimeOff();/*关闭SD24XX倒计时中断程序*/void ClrDjs(void) WriteTimeOn();I2CWriteOneByte(RTC_Address,0x10,0xf0);WriteTimeOff();/*设置SD24XX频率中断演示*/void SetFrq(void)WriteTimeOn();I2CWriteOneByte(RTC_Address,0x10,0xa1);/选通频率中断（INTS1，INTS0），设置频率中断总允许位（INTFE）I2CWriteOneByte(RTC_Address,0x11,0x09);/设置2Hz频率中断WriteTimeOff();/*关闭SD24XX频率中断*/void ClrFrq(void) WriteTimeOn();I2CWriteOneByte(RTC_Address,0x10,0xa0);WriteTimeOff();/|*I2C连续读多个字节*|/|*尾缀B、C、F型读EEPROM程序（连续读）*|uchar I2CReadSerial(uchar DeviceAddress, uchar Address, uchar length,uchar *ps)uchari;if(!I2CStart()return false;I2CSendByte(DeviceAddress); if(!I2CWaitAck()I2CStop(); return false; I2CSendByte(Address);/设置要读的地址I2CWaitAck();I2CStart(); I2CSendByte(DeviceAddress+1);I2CWaitAck();for(i=0;ilength-1;i+,ps+)*ps=I2CReceiveByte();/读数据I2CAck();*ps=I2CReceiveByte();I2CNoAck();I2CStop(); returntrue;/|*I2C连续写多个字节*|/|*尾缀B、C型和F型写EEPROM程序（连续写）演示*|uchar I2CWriteSerial(uchar DeviceAddress, uchar Address, uchar length,uchar *ps)uchari;if(!I2CStart()return false;I2CSendByte(DeviceAddress); /器件地址（或EEPROM页地址）if(!I2CWaitAck()I2CStop(); return false; I2CSendByte(Address);/设置起始地址I2CWaitAck();for(i=0;ilength;i+) I2CSendByte(*(ps+);/B、C型最多连续发送16个字节数据，F型最多连续发送8个字节数据，若使I2CAck();/用的是NVSRAM则无此限制，可连续写任意多个数据直到存储器的末地址。I2CStop(); returntrue;/*尾缀D、E型写EEPROM程序（连续写）*/void WriteEE_DE(uchar sramadd_hi,uchar sramadd_lo,uchar sramdata)uchar n;I2CStart();I2CSendByte(EE_FirstPage_Address);/发送页地址I2CWaitAck();I2CSendByte(sramadd_hi);/先发送高8位地址I2CWaitAck();I2CSendByte(sramadd_lo);/再发送低8位地址I2CWaitAck(); for(n=0;n8;n+)I2CSendByte(sramdata+);/D型最多连续发送32个字节数据，E型最多连续发送64个字节数据，若使用I2CWaitAck();/的是NVSRAM则无此限制，可连续写任意多个数据直到存储器的末地址。I2CStop(); /*D、E型读EEPROM程序*/void ReadEE_DE(uchar sramadd_hi,uchar sramadd_lo,uchar m)uchar n;I2CStart();I2CSendByte(EE_FirstPage_Address);/发送页地址 I2CWaitAck();I2CSendByte(sramadd_hi);/先发送高8位地址I2CWaitAck();I2CSendByte(sramadd_lo);