i2c.rar_i2c_visual c

/************************************************************************************ * 超越自我，创新未来，自强不息 * House Confidential Strictly Private * * Archive: I2C.C * Revision: 1.0 * Author: GANDY HUANG * Date: 2007/09/18 10:40:01 * *************************************************************************************/ // ---------------------------------------------------------------------------------- // >>>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<< // ---------------------------------------------------------------------------------- // Copyright 2007(c) CCT Design House. // This is an unpublished work. // ---------------------------------------------------------------------------------- ////////update version content here//////////////////////// /////////////////////////////////////////////////////// #if !defined(__I2C_C__) #define __I2C_C__ ////////////////////////////////////////////////////////////////////// #include "system.h" #ifdef I2C_DRIVE_MODULE //#include "common\I2c.h" //INSIDE INCLUDE "system.h" !!!!!! #define SET_SDA SDA=1 #define CLR_SDA SDA=0 #define SET_SCL SCL=1 #define CLR_SCL SCL=0 #if 0 #define SDIO_DIR_IN SET_SDA #define SDIO_LOW CLR_SDA #define SDIO_HIGH SET_SDA #define READ_SDIO SDA #define SCLK_LOW CLR_SCL #define SCLK_HIGH SET_SCL unsigned char fgOperationI2c(T_OPERA_MODE operation, unsigned char *data, unsigned char numBytes); #endif ///////////////////////////////////////////////////////////////////////////////// void vI2cTest(void) { if (unBoolState.stBoolState.bI2CIsBusy == 0) unBoolState.stBoolState.bI2CIsBusy = 1; else return ; vI2cStart( ); fgI2cSendData(0X55,NO_NEED_ACK);//0101 0101 //P1.6 vI2cStop( ); unBoolState.stBoolState.bI2CIsBusy = 0; } //////////////////////////////////////////////////////////////////////////////////// void vI2cInit(void) { SET_SCL; // SET_SDA; // } //////////////////////////////////////////////////////////// void vI2cStart(void) { //UINT16 bBusDelayTemp = wWAIT_TIME; SET_SDA; // make sure SDA released vDelay5Us(); SET_SCL; // make sure SCL released vDelay5Us(); CLR_SDA; // start condition here vDelay5Us() ; CLR_SCL; // ready for clocking vDelay5Us() ; } /************************************************************************ Function : void vI2CStop(void) Description : Stop Routine timing : SCL ___|^^^^^ SDA xx___|^^^ (P) |<--- stop condition Parameter : NONE Return : NONE ************************************************************************/ void vI2cStop(void) { CLR_SDA; // ready for stop condition vDelay5Us() ; SET_SCL; // ready for stop condition vDelay5Us() ; SET_SDA; // stop condition here vDelay5Us() ; } /************************************************************************ Function : BOOL fgI2cSendData(BYTE bValue) Description : Send Routine timing : SCL ___|^|___|^|__~__|^|___|^|__ SDA __/D7 \_/D6 \_~_/D0 \_/ACK\_ Parameter : bValue(8-bit output data) Return : TRUE : successful with ACK from slave FALSE : bus (SCL = 0) or ACK failure ************************************************************************/ BOOL8 fgI2cSendData(UINT8 idata bValue, BOOL8 idata fgSendAck) { UINT8 bBitMask = 0x80; // step 1 : 8-bit data transmission while(bBitMask) { if(bBitMask & bValue) { SET_SDA; } else { CLR_SDA; } vDelay5Us() ; SET_SCL; // data clock in vDelay5Us() ; CLR_SCL; // ready for next clock in vDelay5Us() ; bBitMask = bBitMask >> 1; // MSB first & timing delay } // step 2 : slave acknowledge check SET_SDA; // release SDA for ACK polling vDelay5Us() ; SET_SCL; // start ACK polling bBitMask = (UINT8) wWAIT_TIME; // time out protection vDelay5Us() ; if (fgSendAck) { while(SDA && bBitMask--) { ; // wait for ACK, SDA=0 or bitMask=0->jump to this loop } CLR_SCL; // end ACK polling vDelay5Us() ; if(bBitMask) return(TRUE); // return TRUE if ACK detected else return(FALSE); // return FALSE if time out } else { CLR_SCL; // end ACK polling vDelay5Us() ; return(TRUE); } } /************************************************************************ Function : BOOL fgI2cSendDataMore(BYTE bDevice, BYTE bData_Addr, BYTE bDataCount, BYTE *prData) Description : ByteWrite Routine Parameter : bData_Addr -> ic eeprom Data Address bDataCount -> Data Content Cont *prData -> SEND Data Content Pointer Return : TRUE : successful with ACK from slave FALSE : bus (SCL = 0) or ACK failure ************************************************************************/ BOOL8 fgI2cSendDataMore( UINT8 *idata prData, UINT8 idata bDataCount, BOOL8 idata fgSendAck ) { while(bDataCount) { if(!fgI2cSendData(* prData++,fgSendAck)) // Data Content Write ///?????????!!!!!!!!!!!!!!!*********** { return(FALSE); // Device Address exceeds the range } bDataCount--; } return(TRUE); } ////////////////////////////////// void vI2cReadData(UINT8 *idata prValue, BOOL8 idata fgReadAck) { UINT8 bBitMask = 0x80; *prValue = 0; // reset data buffer SET_SDA; // make sure SDA released vDelay5Us(); // step 1 : 8-bit data reception while(bBitMask) { // CLR_SCL; // lee add 2007.12.22?????? // vDelay5Us(); SET_SCL; // data clock out vDelay5Us(); if(SDA) { *prValue = *prValue | bBitMask; // Get all data } // non-zero bits to buffer CLR_SCL; // ready for next clock out vDelay5Us(); bBitMask = bBitMask >> 1; // shift bit mask & clock delay } // step 2 : acknowledgement to slave if(fgReadAck) { CLR_SDA; // ACK here for Sequential Read } else { SET_SDA; // NACK here (for single byte read) } vDelay5Us(); SET_SCL; // NACK clock out vDelay5Us(); CLR_SCL; // ready for next clock out vDelay5Us(); SET_SDA; // release SDA vDelay5Us(); } /************************************************************************ Function : BOOL vI2cReadDataMore(BYTE bDevice, BYTE bData_Addr, BYTE bDataCount, BYTE *prData) Description : DataRead Routine Parameter : bDevice -> Device Address bData_Addr -> Data Address bDataCount -> Data Content Cont *prData -> Data Content Pointer Return : TRUE : successful with ACK from slave FALSE : bus (SCL = 0) or ACK failure ******