自学教程：C++ I2CStart函数代码示例

void ImuRead(ImuRegisters & r, bool bDoMag){I2CStart( 0x68,false,2);I2CSend(0x3B);//59I2CStop(20);rv=I2CReadBuf(0x68, (PBYTE)&r, 14);if(bDoMag){I2CStart(MAGADDR,false,2);I2CSend(0x03);I2CStop(20);rv2=I2CReadBuf(MAGADDR, (PBYTE)&r.mx, 6);I2CStart(MAGADDR,false,2);I2CSend(0x0A);I2CSend(0x01);I2CStop(20);}else{ r.mx=0; r.my=0; r.mz=0;}}

void communications() {    I2CStart();    I2CPut(0xb0);    I2CPut('U');    I2CStart();    I2CPut(0xb1);    I2CPut('Y');    I2CStop();}

void main(){/* Buffer where we will read/write our data */	unsigned char I2CData[] = {0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x09, 0x00};	unsigned char i;	/* Initialize I2C Port */	I2CInit();	/* Send Start condition */	I2CStart();	/* Send DS1307 slave address with write operation */	I2CSend(0xD0);	/* Send subaddress 0x00, we are writing to this location */	I2CSend(0x00);	/* Loop to write 8 bytes */	for (i = 0; i < 8; i++) {		/* send I2C data one by one */		//I2CSend(I2CInitval[i]);I2CSend(I2CData[i]);	}	/* Send a stop condition - as transfer finishes */	I2CStop();	/* We will now read data from DS1307 */	/* Reading for a memory based device always starts with a dummy write */	/* Send a start condition */	I2CStart();	/* Send slave address with write */	I2CSend(0xD0);	/* Send address for dummy write operation */	/* this address is actually where we are going to read from */	I2CSend(0x00);	/* Send a repeated start, after a dummy write to start reading */	I2CRestart();	/* send slave address with read bit set */	I2CSend(0xD1);	/* Loop to read 8 bytes from I2C slave */	for (i = 8; i > 0; i--) {		/* read a byte */		I2CData[i] = I2CRead();		/* ACK if its not the last byte to read */		/* if its the last byte then send a NAK */		if (i - 1)			I2CAck();		else			I2CNak();	}	/* Send stop */	I2CStop();	/* end of program */	while(1);}

void WriteReg(BYTE rg, BYTE val){I2CStart( 0x68,false,2);I2CSend(rg);I2CSend(val);I2CStop(20);}

char i2c_recv(char addr, char count){  char byteptr, byte_in;  if (I2CStart()) return 1;  i2cError = 0;  byteptr = 0;  byte_in = addr | 0x01;  if (ByteOutI2C(byte_in))    {      if (i2cError == I2CERR_NAK) I2CStop();      return i2cError;    }  while(count)    {      count-=1;      if (count) {	byte_in = I2CByteIn(0);      } else {	byte_in = I2CByteIn(1);   /* No ACK during last byte */      }      i2cReceiveBuffer[byteptr] = byte_in;      byteptr++;    }  I2CStop();  return (i2cError ? 1 : 0);}

char I2CSendStop(char addr, char count, char send_stop){  char byteptr, byte_out;  if (I2CStart()) return 1;  i2cError = 0;  byte_out = addr & 0xfe;     /* Ensure that it's a write address */  count++;                    /* Include slave address to byte count */  byteptr = 0;  while(count)    {      if (ByteOutI2C(byte_out))        {	  if (i2cError == I2CERR_NAK && send_stop) I2CStop();	  return i2cError;        }      byte_out = i2cTransmitBuffer[byteptr];      byteptr++;      count--;    }  if (send_stop) I2CStop();  return 0;}

BOOL I2C_startTransfer(I2C_MODULE I2C_ID, BOOL restart){    I2C_STATUS  status;// Send the Start (or Restart) signal    if(restart){        if(I2CRepeatStart(I2C_ID) != I2C_SUCCESS){            #ifdef DEBUG            printf("Error: Bus collision during transfer Start at Read/n");            #endif            return FALSE;        }    }    else{    // Wait for the bus to be idle, then start the transfer        while( !I2CBusIsIdle(I2C_ID) );        if(I2CStart(I2C_ID) != I2C_SUCCESS){            #ifdef DEBUG            printf("Error: Bus collision during transfer Start at Write/n");            #endif            return FALSE;        }    }    // Wait for the signal to complete    do{        status = I2CGetStatus(I2C_ID);    }    while (!(status & I2C_START) );    return TRUE;}

unsigned char DS2482WriteConfig(unsigned char config){    unsigned char read_config;    I2CStart();    I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Transmitter);    I2CWrite(DS2482_CMD_WCFG);    I2CWrite(config | (~config << 4));    I2CRestart();    I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Receiver);    I2CNotAck();    I2CStop();    read_config = I2CRead();    // check for failure due to incorrect read back    if (config != read_config)    {        DS2482Reset();        return false;    }    return true;}

void OneWireWriteByte(unsigned char sendbyte){    unsigned char status;    int poll_count = 0;    I2CStart();    I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Transmitter);    I2CWrite(DS2482_CMD_1WWB);    I2CWrite(sendbyte);    I2CRestart();    I2CSendAddress(DS2482_I2C_ADDR, I2C_Direction_Receiver);    I2CAck();    do    {        status = I2CRead();    }    while ((status & DS2482_STATUS_1WB) && (poll_count++ < POLL_LIMIT));    I2CNotAck();    I2CStop();    status = I2CRead();    if (poll_count >= POLL_LIMIT)        DS2482Reset();}

void ks0066Init(void){	I2CStart(PCF8574_ADDR, I2C_WRITE);	i2cData &= ~PCF8574_BL_LINE;	i2cData &= ~PCF8574_E_LINE;	i2cData &= ~PCF8574_RW_LINE;	i2cData &= ~PCF8574_RS_LINE;	ks0066SetData(KS0066_FUNCTION | KS0066_8BIT);	/* Init data */	ks0066WriteStrob();	delay_ms(20);	ks0066WriteStrob();	delay_ms(5);	ks0066WriteStrob();	delay_us(120);	ks0066WriteStrob();	i2cData &= ~PCF8574_RW_LINE;	i2cData &= ~PCF8574_RS_LINE;	ks0066SetData(KS0066_FUNCTION);	ks0066WriteStrob();	I2CStop();	ks0066WriteCommand(KS0066_FUNCTION | KS0066_2LINES);	ks0066WriteCommand(KS0066_DISPLAY | KS0066_DISPAY_ON);	ks0066WriteCommand(KS0066_CLEAR);	delay_ms(2);	ks0066WriteCommand(KS0066_SET_MODE | KS0066_INC_ADDR);	return;}

void TM1651_Init(uint8_t backlight){   I2CStart(); I2CWritebyte(0x88|  backlight);			 //显示控制命令，开显示，脉冲宽度为11/16 0x08表示显示0|0x08|0x00	//脉冲宽度 1/16-0b000 2/16-0b001 4/16-0b010 10/16-0b011 12/16-0b101 13/16-0b110 14/16-0b111 I2CStop();} 

/****** I2C Driver implementation *******/static bool StartTransfer(I2C_MODULE i2c_id, bool restart){    I2C_STATUS status;    // Send the Start (or Restart) signal    if (restart)    {        I2CRepeatStart(i2c_id);    }    else    {        // Wait for the bus to be idle, then start the transfer        while (!I2CBusIsIdle(i2c_id));        if (I2CStart(i2c_id) != I2C_SUCCESS)        {            //DBPRINTF("Error: Bus collision during transfer Start/n");            return FALSE;        }    }    // Wait for the signal to complete    do    {        status = I2CGetStatus(i2c_id);    } while (!(status & I2C_START));    return TRUE;}

//==============================================================================BOOL i2c_Start(UINT8 restart ){    I2C_STATUS  status;    // Send the Start (or Restart) signal    if(restart)    {        //I2CRepeatStart(EEPROM_I2C_BUS);        I2C1CONbits.RSEN = 1;    }    else    {        // Wait for the bus to be idle, then start the transfer        while( !I2CBusIsIdle(EEPROM_I2C_BUS) );        if(I2CStart(EEPROM_I2C_BUS) != I2C_SUCCESS)        {            DBPRINTF("Error: Bus collision during transfer Start/n");            return FALSE;        }    }    // Wait for the signal to complete    do    {        status = I2CGetStatus(EEPROM_I2C_BUS);    } while ( !(status & I2C_START) );    return TRUE;}

void tda731xSetSpeakers(void){	int8_t spFrontLeft = 0;	int8_t spFrontRight = 0;	int8_t spRearLeft = 0;	int8_t spRearRight = 0;	if (sndPar[MODE_SND_BALANCE].value > 0) {		spFrontLeft -= sndPar[MODE_SND_BALANCE].value;		spRearLeft -= sndPar[MODE_SND_BALANCE].value;	} else {		spFrontRight += sndPar[MODE_SND_BALANCE].value;		spRearRight += sndPar[MODE_SND_BALANCE].value;	}	if (sndPar[MODE_SND_FRONTREAR].value > 0) {		spRearLeft -= sndPar[MODE_SND_FRONTREAR].value;		spRearRight -= sndPar[MODE_SND_FRONTREAR].value;	} else {		spFrontLeft += sndPar[MODE_SND_FRONTREAR].value;		spFrontRight += sndPar[MODE_SND_FRONTREAR].value;	}	I2CStart(TDA731X_I2C_ADDR);	I2CWriteByte(TDA731X_SP_REAR_LEFT | -spRearLeft);	I2CWriteByte(TDA731X_SP_REAR_RIGHT | -spRearRight);	I2CWriteByte(TDA731X_SP_FRONT_LEFT | -spFrontLeft);	I2CWriteByte(TDA731X_SP_FRONT_RIGHT | -spFrontRight);	I2CStop();	return;}

/* Sends a start to begin i2c transaction (with no strings attached) */void sendStart(I2C_MODULE i2c){        while( ! I2CBusIsIdle(i2c));        DelayMs(2);                     // timing for ADXL345        I2CStart(i2c);        while( ! (I2CGetStatus(i2c) & I2C_START) );        I2CClearStatus(i2c, I2C_START);}

uint8_t AT24_read(struct eeprom_data *data) {	uint8_t ret = ESUCCESS;	uint8_t counter = 0;	uint8_t *p;	struct eeprom_data *tmp = (struct eeprom_data *)malloc(sizeof(tmp));	memset(tmp, 0, EEPROM_MU_WR_SIZE);	// Send EEPROM's i2c address + raise read flag	ret = I2CStart(at24_addr | TW_READ);	if (ret > 0)		return ret;	// Read one page	do {		if (counter + 1 == EEPROM_MU_WR_SIZE)			ret = I2CReadByte(p, I2C_NOACK);		else			ret = I2CReadByte(p, I2C_ACK);		if (ret > 0)			return EEEPDATAREAD;		tmp += *p++;		counter++;	} while (counter != EEPROM_MU_WR_SIZE);	I2CStop();	data = tmp;	return ESUCCESS;}

int transfer_start(I2C_MODULE port, I2C_7_BIT_ADDRESS address, UINT8 rw){    I2C_STATUS status;    int result = 0;    while(!I2CBusIsIdle(port));    if(I2CStart(port) != I2C_SUCCESS)        return -1;    do {        status = I2CGetStatus(port);    } while(!(status & I2C_START));    /* Send address */    address.rw = rw;    result = transmit_byte(port, address.byte);    if(result < 0)        return result;    if(!I2CByteWasAcknowledged(port))        return -1;        return result;}

uint8_t DS1307Write(uint8_t address,uint8_t data){	uint8_t res;	//result		//Start	I2CStart();		//SLA+W	res=I2CWriteByte(0b11010000);	//DS1307 address + W		//Error	if(!res)	return FALSE;		//Now send the address of required register	res=I2CWriteByte(address);		//Error	if(!res)	return FALSE;		//Now write the value	res=I2CWriteByte(data);		//Error	if(!res)	return FALSE;		//STOP	I2CStop();		return TRUE;}

/*写SD2200状态寄存器命令*/void I2CWriteStatus(void){			if(!I2CStart())return;	I2CSendByte(0x60,1);      //发送SD2200状态寄存器_1命令	if(!I2CWaitAck()){I2CStop();return;}   //	I2CSendByte(0x03,0);      //IC进行复位初始化,24小时制	I2CSendByte(0x02,0);      //IC不进行复位初始化,24小时制	I2CWaitAck();	I2CStop();        	I2CStart();	I2CSendByte(0x62,1);      //发送SD2200状态寄存器_2命令	I2CWaitAck();   	I2CSendByte(0x00,0);      //清TEST位,禁止中断输出	I2CWaitAck();	I2CStop();        }

void TM1650_CMD(uchar data){	I2CStart();	I2CWrByte(data);	I2Cask();	I2CStop();}

/******读SD2200实时数据寄存器******/void I2CReadDate(void){	uchar m,tmp;	if(!I2CStart())return;	I2CSendByte(0x65,1);//从年开始读取数据	if(!I2CWaitAck()){I2CStop();return;}	for(m=0;m<7;m++)	{		timeBuf[m]=I2CReceiveByte();		if (m!=6)         //最后一个数据不应答		{			I2CAck();		}	}	I2CNoAck();	I2CStop();	/*	for(m=0;m<SEND_TIME_LEN;m++)   {           //BCD处理		tmp=timeBuf[m+4]/16;		sendTimeBuf[m]=timeBuf[m+4]%16;		sendTimeBuf[m]=sendTimeBuf[m]+tmp*10;		showTimeBuf[2*m]=timeBuf[m+4]/16;	    showTimeBuf[2*m+1]=timeBuf[m+4]%16;   }*/   //展开处理 因小时需单独处理 12点以上的需减去40   	tmp=timeBuf[4]/16;	sendTimeBuf[0]=timeBuf[4]%16;	sendTimeBuf[0]=sendTimeBuf[0]+tmp*10;	if(sendTimeBuf[0]>=40){		sendTimeBuf[0]-=40;	}	showTimeBuf[0]=sendTimeBuf[0]/10;    showTimeBuf[1]=sendTimeBuf[0]%10;	tmp=timeBuf[5]/16;	sendTimeBuf[1]=timeBuf[5]%16;	sendTimeBuf[1]=sendTimeBuf[1]+tmp*10;	showTimeBuf[2]=sendTimeBuf[1]/10;    showTimeBuf[3]=sendTimeBuf[1]%10;	tmp=timeBuf[6]/16;	sendTimeBuf[2]=timeBuf[6]%16;	sendTimeBuf[2]=sendTimeBuf[2]+tmp*10;	showTimeBuf[4]=sendTimeBuf[2]/10;    showTimeBuf[5]=sendTimeBuf[2]%10;  	//年月日	tmp=timeBuf[0]/16;	sendTimeBuf[3]=timeBuf[0]%16;	sendTimeBuf[3]=sendTimeBuf[3]+tmp*10;	tmp=timeBuf[1]/16;	sendTimeBuf[4]=timeBuf[1]%16;	sendTimeBuf[4]=sendTimeBuf[4]+tmp*10;	tmp=timeBuf[2]/16;	sendTimeBuf[5]=timeBuf[2]%16;	sendTimeBuf[5]=sendTimeBuf[5]+tmp*10;}

void tda731xSetInput(void){	I2CStart(TDA731X_I2C_ADDR);	I2CWriteByte(TDA731X_SW | (3 - sndPar[MODE_SND_GAIN0 + aproc.input].value) << 3 | !(aproc.extra & APROC_EXTRA_LOUDNESS) << 2 | aproc.input);	I2CStop();	return;}

void tda731xSetVolume(void){	I2CStart(TDA731X_I2C_ADDR);	I2CWriteByte(TDA731X_VOLUME | -sndPar[MODE_SND_VOLUME].value);	I2CStop();	return;}

int8_t *readAlarm(void){	uint8_t temp;	uint8_t i;	I2CStart(DS1307_ADDR);	I2CWriteByte(DS1307_A0_HOUR);	I2CStart(DS1307_ADDR | I2C_READ);	for (i = DS1307_A0_HOUR; i < DS1307_A0_WDAY; i++) {		temp = I2CReadByte(I2C_ACK);		alarm[i - DS1307_A0_HOUR] = temp;	}	temp = I2CReadByte(I2C_NOACK);	alarm[DS1307_A0_WDAY - DS1307_A0_HOUR] = temp;	I2CStop();	return alarm;}

void tea63x0SetSpeakers(){    int8_t spFR = sndPar[MODE_SND_FRONTREAR].value;    // Front channels    I2CStart(TEA63X0_I2C_ADDR);    I2CWriteByte(TEA63X0_FADER);    I2CWriteByte(TEA63X0_MFN | TEA63X0_FCH | (spFR < 0 ? 15 + spFR : 15));    I2CStop();    // Rear channels    I2CStart(TEA63X0_I2C_ADDR);    I2CWriteByte(TEA63X0_FADER);    I2CWriteByte(TEA63X0_MFN | (spFR < 0 ? 15 : 15 - spFR));    I2CStop();    return;}

void tea63x0SetInputMute(void){    I2CStart(TEA63X0_I2C_ADDR);    I2CWriteByte(TEA63X0_AUDIO_SW);    I2CWriteByte((aproc.mute ? TEA63X0_GMU : 0) | (1 << aproc.input));    I2CStop();    return;}

// *****************************************************************************// read one byte// *****************************************************************************uint8_t I2CGetc(struct i2c_info *bb){    uint8_t rv;    I2CStart(bb);    I2CSend(bb, (bb->address * 2)+1); // address    rv = I2CRead(bb, 1);    I2CStop(bb); // stop    return rv;    }

/************显示函数 固定地址写数据 ************/void disp(uint8_t add, uint8_t  value){ I2CStart(); I2CWritebyte(0x44);			//数据命令设置，固定地址，写数据到显示寄存器	 I2CStop(); I2CStart();  I2CWritebyte(add);				//地址命令设置，写入add对应地址 I2CWritebyte(CODE00[value]);			//给add地址写数据 I2CStop();// I2CStart();//  I2CWritebyte(0x80);				//显示控制命令，开显示，脉冲宽度为11/16 0x08表示显示0|0x08|0x00//	//脉冲宽度 1/16-0b000 2/16-0b001 4/16-0b010 10/16-0b011 12/16-0b101 13/16-0b110 14/16-0b111// I2CStop();}

void Tm1651_BackLight(uint16_t jibie){    I2CStart();  I2CWritebyte(0x88|jibie);			 //显示控制命令，开显示，脉冲宽度为11/16 0x08表示显示0|0x08|0x00	//脉冲宽度 1/16-0b000 2/16-0b001 4/16-0b010 10/16-0b011 12/16-0b101 13/16-0b110 14/16-0b111  //F 4bit 1表示开显示 0关显示 3bit 2bit 1bit表示脉冲宽度  I2CStop();}

BOOLEAN NTAPIVideoPortDDCMonitorHelper(   PVOID HwDeviceExtension,   PVOID I2CFunctions,   PUCHAR pEdidBuffer,   ULONG EdidBufferSize   ){   PDDC_CONTROL ddc = (PDDC_CONTROL)I2CFunctions;   PI2C_CALLBACKS i2c = &ddc->I2CCallbacks;   INT Count, i;   PUCHAR pBuffer = (PUCHAR)pEdidBuffer;   BOOL Ack;   TRACE_(VIDEOPRT, "VideoPortDDCMonitorHelper()/n");   ASSERT_IRQL_LESS_OR_EQUAL(PASSIVE_LEVEL);   if (ddc->Size != sizeof (ddc))     {        WARN_(VIDEOPRT, "ddc->Size != %d (%d)/n", sizeof (ddc), ddc->Size);        return FALSE;     }   /* select eeprom */   if (!I2CStart(HwDeviceExtension, i2c, DDC_EEPROM_ADDRESS | WRITE))     return FALSE;   /* set address */   if (!I2CWrite(HwDeviceExtension, i2c, 0x00))     return FALSE;   /* change into read mode */   if (!I2CRepStart(HwDeviceExtension, i2c, DDC_EEPROM_ADDRESS | READ))     return FALSE;   /* read eeprom */   RtlZeroMemory(pEdidBuffer, EdidBufferSize);   Count = min(128, EdidBufferSize);   for (i = 0; i < Count; i++)     {        Ack = ((i + 1) < Count);        pBuffer[i] = I2CRead(HwDeviceExtension, i2c, Ack);     }   I2CStop(HwDeviceExtension, i2c);   /* check EDID header */   if (pBuffer[0] != 0x00 || pBuffer[1] != 0xff ||       pBuffer[2] != 0xff || pBuffer[3] != 0xff ||       pBuffer[4] != 0xff || pBuffer[5] != 0xff ||       pBuffer[6] != 0xff || pBuffer[7] != 0x00)     {        WARN_(VIDEOPRT, "VideoPortDDCMonitorHelper(): Invalid EDID header!/n");        return FALSE;     }   INFO_(VIDEOPRT, "VideoPortDDCMonitorHelper(): EDID version %d rev. %d/n", pBuffer[18], pBuffer[19]);   INFO_(VIDEOPRT, "VideoPortDDCMonitorHelper() - SUCCESS!/n");   return TRUE;}