ATMEGA16讀寫24C02 C51程序

完整代碼下載地址: http://www.51hei.com/f/2402avr.rar

main函數(shù)：/*程序功能：ATMEGA16讀寫24C02作者：朱波時間：2012年1月30日說明：程序運行后會從0開始自動計數(shù)到256(對字節(jié)操作的結(jié)果)當復(fù)位或者斷電時24C02保存斷電時的數(shù)據(jù)，當重新啟動后計數(shù)值會從斷電時的值開始計數(shù)*/#include iom16v.h>#include macros.h>#include"delay.h"  #include"display.h"#include"24C02.h"#define  uchar unsigned char#define  uint  unsigned intuint num;//定義變量用于讀取24C02中的數(shù)值,注意必須為uint型void  main(){  LCD_init();twi_init();while(1){num=IIC_Read(0x00);//從器件中讀取(0x00是器件地址)num=num+1;//加1num=num%1000;//關(guān)鍵語句，沒有此句則不工作*/IIC_Write(num,0x00);//加1后寫入器件display();}}延時函數(shù)delay.c#include"delay.h"void delay(unsigned int ms){unsigned int i,j;for(i=0;ims;i++){for(j=0;j1141;j++);}}顯示函數(shù)display.c#include iom16v.h>#include macros.h>#include"display.h"#define  uchar unsigned char#define  uint  unsigned intuchar table1[]="0123456789";uchar table2[]="zhubo-24C02";uchar table3[]="result:";extern uint num;//主函數(shù)中的值void write_com(uchar com){PORTD=~BIT(4);PORTD=~BIT(5);PORTB=com;PORTD|=BIT(6);delay(1);PORTD=~BIT(6);}void write_dat(uchar dat){     PORTD|=BIT(4);PORTD=~BIT(5);PORTB=dat;PORTD|=BIT(6);delay(1);PORTD=~BIT(6);}void LCD_init(){ DDRB=0XFF;DDRD|=BIT(4)|BIT(5)|BIT(6);PORTD=~BIT(6);write_com(0X38);delay(5);write_com(0X01);delay(5);write_com(0X0C);delay(5);write_com(0X06);delay(5);}void display(){uint i;write_com(0X80+0);delay(5);for(i=0;i7;i++){write_dat(table3[i]);delay(5);} //這是在1602液晶中顯示數(shù)值的方法write_com(0X80+8);delay(5);write_dat(table1[num/1000]);delay(5);write_com(0X80+9);delay(5);write_dat(table1[num%1000/100]);delay(5);write_com(0X80+10);delay(5);write_dat(table1[num%100/10]);delay(5);write_com(0X80+11);delay(5);write_dat(table1[num%10]);delay(5);write_com(0X80+0X40);//仿真與實際1602有區(qū)別delay(5);for(i=0;i11;i++){write_dat(table2[i]);delay(5);}}24C02.c:#include iom16v.h>#include macros.h>#include"24C02.h"#define  uchar unsigned char#define  uint  unsigned int//主機模式啟動狀態(tài)碼#define I2C_START                       0x08   //啟動總線#define I2C_RESTART      0x10   //重新啟動總線//主機發(fā)送模式狀態(tài)碼#define I2C_MT_SLA_ACK   0x18   //SLA+W寫地址已發(fā)送，收到應(yīng)答位#define I2C_MT_SLA_NACK  0x20   //SLA+W寫地址已發(fā)送，收到非應(yīng)答位#define I2C_MT_DATA_ACK  0x28   //寫入數(shù)據(jù)已發(fā)送，收到應(yīng)答位#define I2C_MT_DATA_NACK 0x30   //寫入數(shù)據(jù)已發(fā)送，收到應(yīng)答位#define I2C_MT_ARB_LOST  0x38   //SLA+W或數(shù)據(jù)仲裁失敗//主機接收模式狀態(tài)碼#define I2C_MR_ARB_LOST  0x38   //SLA+R或NOT ACK的仲裁失敗#define I2C_MR_SLA_ACK   0x40   //SLA+R已發(fā)送，收到應(yīng)答位#define I2C_MR_SLA_NACK  0x48   //SLA+R已發(fā)送，收到非應(yīng)答位#define I2C_MR_DATA_ACK  0x50   //接收到數(shù)據(jù)，應(yīng)答位已返回#define I2C_MR_DATA_NACK 0x58   //接收到數(shù)據(jù)，非應(yīng)答位已返回//從機接收模式狀態(tài)碼#define I2C_SR_SLA_ACK    0x60   //自己的SLA+W已經(jīng)被接收ACK已返回#define I2C_SR_ARB_LOST_SLA_ACK  0x68   //SLA+R/W作為主機的仲裁失敗，自己的SLA+W已經(jīng)被接收ACK已返回#define I2C_SR_GCALL_ACK   0x70   //接收到廣播地址ACK已返回#define I2C_SR_ARB_LOST_GCALL_ACK 0x78   //SLA+R/W作為主機的仲裁失敗，接收到廣播地址ACK已返回#define I2C_SR_DATA_ACK    0x80   //以前以自己的SLA+W被尋址，數(shù)據(jù)已經(jīng)被接收ACK已返回#define I2C_SR_DATA_NACK   0x88   //以前以自己的SLA+W被尋址，數(shù)據(jù)已經(jīng)被接收NOT ACK已返回#define I2C_SR_GCALL_DATA_ACK  0x90   //以前以廣播方式被尋址，數(shù)據(jù)已經(jīng)被接收ACK已返回#define I2C_SR_GCALL_DATA_NACK  0x98   //以前以廣播方式被尋址，數(shù)據(jù)已經(jīng)被接收NOT ACK已返回#define I2C_SR_STOP     0xA0   //在以從機工作時接收到STOP或重復(fù)START//從機發(fā)送模式狀態(tài)碼#define I2C_ST_SLA_ACK   0xA8   //自己的SLA+R已經(jīng)被接收ACK已返回#define I2C_ST_ARB_LOST_SLA_ACK 0xB0   //SLA+R/W作為主機的仲裁失敗，自己的SLA+R已經(jīng)被接收ACK已返回#define I2C_ST_DATA_ACK   0xB8   //TWDR里數(shù)據(jù)已經(jīng)被發(fā)送接收到ACK#define I2C_ST_DATA_NACK 0xC0   //TWDR里數(shù)據(jù)已經(jīng)被發(fā)送接收到NOT ACK#define I2C_ST_LAST_DATA  0xC8   //TWDR的一字節(jié)數(shù)據(jù)已經(jīng)發(fā)送（TWAE='0'）,接收到ACK//其他狀態(tài)碼#define I2C_NO_INFO   0xF8   //沒有相關(guān)的狀態(tài)信息，TWINT='0'#define I2C_BUS_ERROR  0x00   //由于非法的START或STOP引起的總線錯誤//定義SLA中讀寫控制位極性#define I2C_READ   1#define I2C_WRITE  0#define RD_DEVICE_ADDR                  0XA1   //寫的器件地址#define WD_DEVICE_ADDR                  0XA0   //讀的器件地址//常用TWI操作（主模式寫和讀）#define Start() (TWCR=(1TWINT)|(1TWSTA)|(1TWEN))#define Stop()  (TWCR=(1TWINT)|(1TWEN)|(1TWSTO))                   #define Wait()  {while(!(TWCR(1TWINT)));}#define TestAck() (TWSR0XF8)#define SetAck   (TWCR|=(1TWEA))#define SetNoAck  (TWCR=~(1TWEA))#define Twi()     (TWCR=(1TWINT)|(1TWEN))//重新啟動發(fā)送數(shù)據(jù)   #define Write8Bit(x) {TWDR=(x);TWCR=(1TWINT)|(1TWEN);}//裝入SLA_W到TWDR//寄存器，TWINT位清零，啟動發(fā)送地址//定義運行狀態(tài)返回值極性#define I2C_ERR   0     //錯誤#define I2C_CRR   1     //正確//定義TWINT位置位查詢等待時間#define WAITCOUNT  50   //3.6864M時，此處必須大于60，驗證得知小于60，程序均不能正常工作void twi_init()//硬件初始化{TWBR=0X20;//TWBR的值不小于10TWCR=0X04;//使能TWI操作 TWSR=0;//1分頻}uchar IIC_Write(uchar wdata,uchar addr)//字節(jié)寫操作{//按照時序來寫Start();//開始Wait();//等待if(TestAck()!=I2C_START)//測試return 1;// 如果出錯則返回1Write8Bit(WD_DEVICE_ADDR);//寫器件地址(SLAVE ADDRESS)Wait();//等待if(TestAck()!=I2C_MT_SLA_ACK  )//檢驗TWI狀態(tài)寄存器，屏蔽return 1;//預(yù)分頻位，如果狀態(tài)字不是SLA+R已發(fā)送，收到應(yīng)答位//轉(zhuǎn)出錯處理 ,(SLA針對的是器件地址)此時時序中第一個ACK結(jié)束Write8Bit(addr);//寫數(shù)據(jù)地址（要存儲到哪個字節(jié)上BYTE ADDRESS）Wait();//等待if(TestAck()!=I2C_MT_DATA_ACK )//檢驗TWI狀態(tài)寄存器，屏蔽return 1;//預(yù)分頻位，如果狀態(tài)字不是寫入數(shù)據(jù)已發(fā)送，收到應(yīng)答位//轉(zhuǎn)出錯，到此時序中第二個ACK結(jié)束Write8Bit(wdata);//寫數(shù)據(jù)（DATA）Wait();//等待if(TestAck()!=I2C_MT_DATA_ACK)//DATA和ADDRESS是EEPROM內(nèi)部的就用return 1;   //I2C_MT_DATA_ACKStop();return 0;//運行到STOP處都沒有出錯就返回0}uchar IIC_Read(uchar addr)//根據(jù)選擇讀時序來寫的{uchar temp;//定義此變量從單片機中讀取數(shù)據(jù)//此段與上個函數(shù)相同Start();Wait();if(TestAck()!=I2C_START)//測試return 1;//此段與上個函數(shù)相同Write8Bit(WD_DEVICE_ADDR);//寫器件地址(SLAVE ADDRESS)Wait();if(TestAck()!=I2C_MT_SLA_ACK)//sla是器件外部return 1;//此處時序下方的第一個ACK完成Write8Bit(addr);//寫存儲地址(BYTE ADDRESS)Wait();if(TestAck()!=I2C_MT_DATA_ACK)//器件內(nèi)部用I2C_MT_DATA_ACKreturn 1;//此處時序下方的第二個ACK完成Start();//根據(jù)時序又出現(xiàn)了STARTWait();if(TestAck()!=I2C_RESTART)//判斷是否是重復(fù)START出現(xiàn)return 1;//如果出錯則返回1Write8Bit(RD_DEVICE_ADDR);//讀器件地址(SLAVE ADDRESS)Wait();if(TestAck()!=I2C_MR_SLA_ACK)//現(xiàn)在是主機接收所以不是T而是Rreturn 1;//此處時序下方的第三個ACK完成Twi();//重新啟動TWI總線Wait();if(TestAck()!=I2C_MR_DATA_NACK)//向器件里讀數(shù)據(jù)，時序中為NO ACKreturn 1;//程序到了這里數(shù)據(jù)已經(jīng)到了單片機里邊了temp=TWDR;//從數(shù)據(jù)寄存器中讀取數(shù)據(jù)Stop();//發(fā)送停止信號return temp;}以下是接口函數(shù)代碼：delay.h:#ifndef delay_h#define delay_hextern void delay(unsigned int ms);#endifdisplay.h:#define  uchar unsigned char#define  uint  unsigned int#ifndef display_h24C02.h:#define  uchar unsigned char#define  uint  unsigned intextern void twi_init();extern uchar IIC_Write(uchar wdata,uchar addr);extern uchar IIC_Read(uchar addr);#define display_hextern void write_com(uchar com);extern void write_dat(uchar dat);extern void LCD_init();extern void display();extern uchar table[];#endif