i2c.rar_stc89c52 i2c_单片机i2c编程

#include<reg51.h> #include<define.h> #include<i2c.h> void __CS_IIC_Initial( void ); void _CS_Set_sda_high( void ); void _CS_Set_sda_low ( void ); void _CS_Set_sck_high( void ); void _CS_Set_sck_low ( void ); BIT _CS_IIC_GetACK(void); void _CS_IIC_SetACk(void); void _CS_IIC_SetNAk(void); void _CS_IIC_START(void); void _CS_IIC_STOP(void); void _CS_IIC_TxByte(BYTE); BYTE _CS_IIC_RxByte(void); BIT _CS_I2C_Read ( BYTE,BYTE,BYTE,BYTE *); BIT _CS_I2C_Write( BYTE,BYTE,BYTE,BYTE *); BIT HAL_EEPROM_Write (BYTE,BYTE); BIT HAL_EEPROM_PWrite( BYTE , BYTE* , BYTE ); BIT HAL_EEPROM_Read ( BYTE ,BYTE *); BIT HAL_EEPROM_PRead( BYTE , BYTE , BYTE* ); void __delay(BYTE); //BIT judge_password(void); //# [19]EEPROM read/write function part begin // ------------------------------------------------------------------ void _CS_Set_sda_high() { __sbCSsda=1; NOP; NOP; NOP; NOP; } void _CS_Set_sda_low() { __sbCSsda=0; NOP; NOP; NOP; NOP; } void _CS_Set_sck_high() { __sbCSsck=1; NOP; NOP; NOP; NOP; } void _CS_Set_sck_low() { __sbCSsck=0; NOP; NOP; NOP; NOP; } // ------------------------------------------------------------------- // __CS_IIC_Initial // initial I2C bus before use // look for SDA high in each cycle while SCL is high //-------------------------------------------------------------------- void __CS_IIC_Initial(void) { _CS_Set_sck_low(); _CS_IIC_STOP(); __delay(DELAY_10mS); } // ------------------------------------------------------------------- // _CS_IIC_GetACK // 1) The acknowledge-related clock pulse is generated by the master. // 2) The transmitter (Tx) release the SDA line (HIGH) during the // acknowledge clock pulse. // 3) The receiver (Rx) must pull down the SDA line during the // acknowledge clock pulse so that it remains stable LOW during // the HIGH period of this clock pulse. // // Return: // LOW if OK // ------------------------------------------------------------------- BIT _CS_IIC_GetACK (void) { BIT bResult; _CS_Set_sda_high(); //__sbCSsda=1; _CS_Set_sck_high(); bResult = __sbCSsda; _CS_Set_sck_low(); return ( bResult ); } // _CS_IIC_GetACK // ------------------------------------------------------------------- // _CS_IIC_SetACK // __ ____ // SDA: \________/ // ____ // SCL: ____/ \____ // // ------------------------------------------------------------------- void _CS_IIC_SetACK (void) { _CS_Set_sck_low(); _CS_Set_sda_low(); _CS_Set_sck_high(); _CS_Set_sck_low(); } // _SC_IIC_SetACK // --------------------------------------------------------------------- // _CS_IIC_SetNAK // ____ // SCK: ___/ \____ // _____________ // SDA: // ------------------------------------------------------------------- void _CS_IIC_SetNAK (void) { _CS_Set_sck_low(); _CS_Set_sda_high(); _CS_Set_sck_high(); _CS_Set_sck_low(); } // _CS_IIC_SetNAK // ------------------------------------------------------------------- // _CS_IIC_START - START condition (SDA falling edge). // ____ // SDA: \_____ // _____ // SCL: \__ // // ------------------------------------------------------------------- void _CS_IIC_START (void) { NOP; NOP; NOP; NOP; _CS_Set_sda_high(); _CS_Set_sck_high();//prepare for start condition _CS_Set_sda_low(); _CS_Set_sck_low(); } // _CS_IIC_START // ------------------------------------------------------------------- // _CS_IIC_STOP - STOP condition (SDA rising edge). // ____ __ // SDA: ____\_____/ // __ _______ // SCL: __\___/ // // ------------------------------------------------------------------- void _CS_IIC_STOP (void) { NOP; NOP; NOP; NOP; _CS_Set_sck_low(); _CS_Set_sda_low();//prepare for stop condition _CS_Set_sck_high(); _CS_Set_sda_high(); __delay(DELAY_10mS);//delay time from stop to start time must >10mS } // CS_IIC_STOP // ------------------------------------------------------------------- // _CS_IIC_TxByte - Parallel serial conversion. // __ ________ // SDA: __X_state__ // ________ // SCL: _____/ \__ // // ------------------------------------------------------------------- void _CS_IIC_TxByte (BYTE bValue) { BYTE i ; for(i = 0 ; i < 8 ; i++) { if( bValue & 0x80) _CS_Set_sda_high(); else _CS_Set_sda_low(); _CS_Set_sck_high(); _CS_Set_sck_low(); bValue = bValue << 1 ; } } //_CS_IIC_TxByte // ------------------------------------------------------------------- // _CS_IIC_RxByte - // ______ // SDA: --<_read_>-- // _________ // SCL: __/ \__ // // ------------------------------------------------------------------- BYTE _CS_IIC_RxByte (void) { BYTE bResult; BYTE i; bResult = 0x00; // clear value // _CS_Set_sda_high(); for ( i=0;i<8;i++) // Read all bits // { _CS_Set_sck_high(); bResult <<=1; // Set Result to correct value // if ( __sbCSsda ) // Sampling SDA input level // bResult |= 0x01; else bResult &= 0xFE; _CS_Set_sck_low(); } return( bResult ); } // _IIC_RxByte // ********************************************************************* // Function : _CS_I2C_Read // Description : // Arguments : DevSel : Device ID // addr : read address // Return : data in the address // Side Effect : // ********************************************************************* BIT _CS_I2C_Read ( BYTE DevSel, BYTE addr, BYTE count, BYTE *val) { BIT bError; _CS_IIC_START(); // START condition _CS_IIC_TxByte(DevSel); bError = _CS_IIC_GetACK(); if ( bError ) return FALSE; _CS_IIC_TxByte(addr); bError = _CS_IIC_GetACK(); if ( bError ) return FALSE; _CS_IIC_START(); // START condition _CS_IIC_TxByte((BYTE)(DevSel|0x01)); bError = _CS_IIC_GetACK(); if ( bError ) return FALSE; while(count) { *val=_CS_IIC_RxByte(); val++; count--; if(count) _CS_IIC_SetACK(); } _CS_IIC_SetNAK (); _CS_IIC_STOP(); // STOP condition return TRUE; } // ********************************************************************* // Function : _CS_I2C_Write // Description : // Arguments : DevSel : Device ID // AS pin '0' : ID is 40h // AS pin '1' : ID is 42h // * pBuffer : Buffer pointer // but normal is not more than 8) // count : size of buffer normal is less than 8 // Return : // Side Effect : // ********************************************************************* BIT _CS_I2C_Write ( BYTE DevSel, BYTE addr ,BYTE count ,BYTE *pBuffer ) { BYTE idx; BIT bError; _CS_IIC_START(); // START condition _CS_IIC_TxByte ( DevSel ); // write DevEel adress bError = _CS_IIC_GetACK(); if ( bError ) return FALSE; _CS_IIC_TxByte ( addr ); //