testeeprom.c

AVR开发板电路图/PCB/示范程序

#include <mega16.h>
#include <USART.h> 
#include <TWI.h>
#include <TWIAPP.h>
#include <String.h>
#include <Types.h>
#include <delay.h>

/************************
  接线方式：
  DS1302           PortC
  6.VCC  5.WP1     1.PC0  2.PC1
  4.SCL  3.WP2     3.PC2  4.PC3
  2.SDA  1.GND     5.PC4  6.PC5
                   7.PC6  8.PC7
                   9.GND  10.VCC
  
  6.VCC --  10.VCC
  4.SCL --  1.PC0
  2.SDA --  2.PC1
  5.WP1 --  3.PC2 (可不接)
  3.WP2 --  4.PC3 (可不接)
  1.GND --  9.GND

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

#define MAXCMDBUF 32
#pragma warn-
//eeprom unsigned char EEPROMS[512];
#pragma warn+

void port_init(void)  //初始化各端口
{
 PORTB = 0xF0;
 DDRB  = 0x0F;
 PORTC = 0x00;
 DDRC  = 0x00;
 PORTB =0b11001100;
}

void TestCmd(void)
{
	unsigned int i;
  unsigned char CmdBuf[CMD_MAXBUFFER]; //命令缓冲区
  unsigned char Chip;    //芯片地址
  unsigned int Addr;     //内存地址
  unsigned char AddrType;//内存地址格式 8 bit 或16 bit
  unsigned int Cnt;      //读取长度
  unsigned char LED;     //LED显示，作用不大
	USART_Init(47);  //3.6864M=23,   7.3728M=47
	TransmitStringF("Welcome AVR Zone");
	for (i=0;i<CMD_MAXBUFFER;i++) CmdBuf[i]=0;  //初始化命令缓冲区
	LED=0;
	while (1)
	{
	 ReceiveCMD(CmdBuf);	//读取一条命令行
   if (CmdBuf[0]>0)   //如果命令行长度不为零
   {
           //for (i=0;i<MAXCMDBUF;i++) TransmitByte(CmdBuf[i]);
     TransmitByte(CMDBEGIN);   //送出命令开始符
     TransmitByte(CmdBuf[1]);  //送出命令
     if (CmdBuf[1]=='H') //如果接收的是帮助命令
     {
       TransmitStringF("Command format(Hex):'1B CMD 1C'");
       TransmitByte(13);
       TransmitStringF("Read EEPROM Data:'R','Addr','Count'");
       TransmitByte(13);
       TransmitStringF("Write EEPROM Data:'W','Addr','Data'");
       TransmitByte(13);
       TransmitStringF("Show Help:'H'");
       TransmitByte(13);
       PORTB=~PORTB;
     }               
     if (CmdBuf[1]=='R') //如果接收的是读取EEPROM命令
     {
       AddrType=HexToByte(&CmdBuf[2]);  //EEPROM地址类型
       Chip=(HexToByte(&CmdBuf[4])&0B00001110)|EEPROM_BUS_ADDRESS; //芯片地址
       Addr=(((unsigned int)HexToByte(&CmdBuf[6]))<<8)|((unsigned int)HexToByte(&CmdBuf[8])); //内存地址
       Cnt=(((unsigned int)HexToByte(&CmdBuf[10]))<<8)|((unsigned int)HexToByte(&CmdBuf[12])); //读写个数
       if (Addr+Cnt>255) Cnt=255-Addr;
       for (i=0;i<Cnt;i++) 
         {
          TransmitString(ByteToHex(EEPROM_Read(Chip,AddrType,Addr+i)));  //送回上位机
          TransmitByte(32);
         }
     }
     if (CmdBuf[1]=='W') //如果接收的是写入EEPROM命令
     { 
       AddrType=HexToByte(&CmdBuf[2]);
       Chip=(HexToByte(&CmdBuf[4])&0B00001110)|EEPROM_BUS_ADDRESS;
       Addr=(((unsigned int)HexToByte(&CmdBuf[6]))<<8)|((unsigned int)HexToByte(&CmdBuf[8]));
       EEPROM_Write(Chip,AddrType,Addr,HexToByte(&CmdBuf[10]));
       delay_ms(5);  //写EEPROM的时候要隔5ms
       TransmitString(ByteToHex(EEPROM_Read(Chip,AddrType,Addr)));  //回送给上位机做检查
     }
   TransmitByte(CMDEND); //送出命令结束符
   for (i=0;i<CMD_MAXBUFFER;i++) CmdBuf[i]=0;  //清空命令缓冲区
   }
	LED++;
	//PORTB&=~((LED>>7)&0x03);
	}
}

void main()
{
	port_init();
	TWI_DefaultInit();
 	TestCmd();
}