AT24CXX.rar_AT24cxx 读写 程序_at24cxx

//****************************11.0592MHz晶振，延时8.69*Count US**************************** void DelayUS(unsigned int Count) { while(--Count){;} } //****************************AT24C02B存储芯片代码**************************** /****************************************************************************/ void Write24C02B(unsigned char Wdata,unsigned char RomAddress) { AT24C02B_Start(); AT24C02B_Write8Bit(Write24C02BAddress); AT24C02B_TestAck(); AT24C02B_Write8Bit(RomAddress); AT24C02B_TestAck(); AT24C02B_Write8Bit(Wdata); AT24C02B_TestAck(); AT24C02B_Stop(); DelayUS(11000); } /***************************************************************************/ unsigned char Read24C02B(unsigned char RomAddress) { unsigned char data temp; AT24C02B_Start(); AT24C02B_Write8Bit(Write24C02BAddress); AT24C02B_TestAck(); AT24C02B_Write8Bit(RomAddress); AT24C02B_TestAck(); AT24C02B_Start(); AT24C02B_Write8Bit(Read24C02BAddress); AT24C02B_TestAck(); temp=AT24C02B_Read8Bit(); AT24C02B_NoAck(); AT24C02B_Stop(); return temp; } /****************************************************************************/ void AT24C02B_I2CWait(void) { _nop_(); _nop_(); } /****************************************************************************/ void AT24C02B_Start(void) { AT24C02B_SDA=1; AT24C02B_SCL=1; AT24C02B_I2CWait(); AT24C02B_SDA=0; AT24C02B_I2CWait(); AT24C02B_SCL=0; AT24C02B_I2CWait(); } /****************************************************************************/ void AT24C02B_Stop(void) { AT24C02B_SCL=0; AT24C02B_SDA=0; AT24C02B_I2CWait(); AT24C02B_SCL=1; AT24C02B_I2CWait(); AT24C02B_SDA=1; AT24C02B_I2CWait(); } /****************************************************************************/ void AT24C02B_NoAck(void) { AT24C02B_SDA=1; AT24C02B_SCL=1; AT24C02B_I2CWait(); AT24C02B_SCL=0; AT24C02B_I2CWait(); } /****************************************************************************/ unsigned char AT24C02B_TestAck(void) { unsigned char data ErrorBit; AT24C02B_SDA=1; AT24C02B_SCL=1; AT24C02B_I2CWait(); ErrorBit=AT24C02B_SDA; AT24C02B_I2CWait(); AT24C02B_SCL=0; AT24C02B_I2CWait(); AT24C02B_I2CWait(); return(ErrorBit); } /****************************************************************************/ void AT24C02B_Write8Bit(unsigned char input) { unsigned char data temp; for(temp=8;temp!=0;temp--) { if(input&0x80) AT24C02B_SDA=1; else AT24C02B_SDA=0; AT24C02B_I2CWait(); AT24C02B_SCL=1; AT24C02B_I2CWait(); AT24C02B_SCL=0; AT24C02B_I2CWait(); input=input<<1; } } /****************************************************************************/ unsigned char AT24C02B_Read8Bit(void) { unsigned char data temp,rbyte=0; for(temp=8;temp!=0;temp--) { AT24C02B_SCL=1; AT24C02B_I2CWait(); rbyte=rbyte<<1; if(AT24C02B_SDA) rbyte=rbyte|0x1; AT24C02B_I2CWait(); AT24C02B_SCL=0; AT24C02B_I2CWait(); } return(rbyte); } 我的温湿度监控板子上的部分代码。