iic.rar_51串口控制

#include "reg51.h" sbit SCL = P0^6; sbit SDA = P0^7; sbit Key1 = P3^4; void delay1ms(unsigned int time){ unsigned int i; for(i = 0;i<50*time;i++); } void Serinit(){ SCON = 0X50; TMOD = 0X20; TH1 = 253; TL1 = 253; TR1 = 1; ES = 1; EA = 1; } void SendData(unsigned char sData){ TI = 0; SBUF = sData; while(!TI); TI = 0; } void Start(){ SCL = 1; SDA = 1; SDA = 0; SCL = 0; } void Stop(){ SCL = 0; SDA = 0; SDA = 1; SCL = 1; } void SendAck(bit blag){ SCL = 0; SDA = blag; SCL = 1; SCL = 0; } bit RevAck(){ bit blag; SCL = 0; SCL = 1; blag = SDA; SCL = 0; return blag; } void SendByte(unsigned char sData){ unsigned char icount; for(icount = 0;icount<8;icount++){ SCL = 0; if(sData & 0x80) SDA = 1; else SDA = 0; SCL = 1; sData <<= 1; } SCL = 0; } unsigned char RevByte(){ unsigned char icount,cRev; for(icount = 0;icount<8;icount++){ SCL = 0; cRev <<= 1; SCL = 1; if(SDA) cRev += 1; } SCL = 0; return cRev; } unsigned char WriteData(unsigned char Addr,unsigned char sData){ Start(); SendByte(0xa0); if(RevAck()) return 1; SendByte(Addr); if(RevAck()) return 2; SendByte(sData); if(RecAck()) return 3; Stop(); return 0; } unsigned char ReadData(unsigned char Addr){ unsigned char Rdata; Start(); SendByte(0xa0); if(RevAck()) return 1; SendByte(Addr); if(RevAck()) return 2; Start(); SendByte(0xa1); if(RevAck()) return 3; Rdata = RevByte(); SendAck(1); Stop(); return Rdata; } main(){ unsigned char ReadData1,WriteData1 = 0; Serinit(); while(1){ if(!Key1){ delay1ms(1); if(!Key1){ while(!Key1); WriteData(10,++WriteData1); delay1ms(500); ReadData1 = ReadData(10); SendData(ReadData1); } } } }