iic.rar_I2C多主通信_IIC多主_io 模拟 i2c

#include <REG_MA86L104.H> #include <intrins.h> sbit SDA= P3^1; sbit SCL= P3^0; #define uchar unsigned char #define uint unsigned int /***************for 24c02************************************************************/ #define WriteDeviceAddress 0xa0 #define ReadDviceAddress 0xa1 #define NOP5() _nop_();_nop_();_nop_();_nop_();_nop_() /***************************************************************************/ void Start() { SDA=1; NOP5(); SCL=1; NOP5(); SDA=0; NOP5(); SCL=0; NOP5(); } /***************************************************************************/ void Stop() { SDA=0; NOP5(); SCL=1; NOP5(); SDA=1; NOP5(); SCL=0; NOP5(); } /***************************************************************************/ void Ack() { SDA=0; NOP5(); SCL=1; NOP5(); SCL=0; NOP5(); SDA=1; } /***************************************************************************/ void NoAck() { SDA=1; NOP5(); SCL=1; NOP5(); SCL=0; NOP5(); } /***************************************************************************/ bit TestAck(void) { bit ErrorBit; SDA=1; NOP5(); SCL=1; NOP5(); ErrorBit=SDA; NOP5(); SCL=0; return(ErrorBit); } /***************************************************************************/ void Write8Bit(unsigned char input) { unsigned char temp; for(temp=8;temp!=0;temp--) { SDA=(bit)(input&0x80); NOP5(); SCL=1; NOP5(); SCL=0; NOP5(); input=input<<1; } } /***************************************************************************/ void write24c02(unsigned char *Wdata,unsigned char RomAddress,unsigned char number) { Start(); Write8Bit(WriteDeviceAddress); TestAck(); Write8Bit(RomAddress); TestAck(); for(;number!=0;number--) { Write8Bit(*Wdata); TestAck(); Wdata++; } Stop(); } /***************************************************************************/ unsigned char Read8Bit() { unsigned char temp,rbyte=0; for(temp=8;temp!=0;temp--) { SCL=1; rbyte=rbyte<<1; rbyte=rbyte|((unsigned char)(SDA)); SCL=0; } return(rbyte); } /***************************************************************************/ void read24c02(unsigned char *RamAddress,unsigned char RomAddress,unsigned char bytes) { Start(); Write8Bit(WriteDeviceAddress); TestAck(); Write8Bit(RomAddress); TestAck(); Start(); Write8Bit(ReadDviceAddress); TestAck(); while(bytes!=1) { *RamAddress=Read8Bit(); Ack(); RamAddress++; bytes--; } *RamAddress=Read8Bit(); NoAck(); Stop(); } main() { uchar date[10]; read24c02 (&date,0x0,10); write24c02(&date,0x0,10); while(1); }