自学教程：C++ wiresend函数代码示例

/** * Writes a given register */void RFduinoProXShield::writeRegister(uint8_t regAddr, uint8_t regValue){	// Write the register	Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);	wiresend(regAddr);	wiresend(regValue);	Wire.endTransmission();}

/** * Writes all the pins in one go. This method is very useful if you are implementing a multiplexed matrix and want to get a decent refresh rate. */void Adafruit_MCP23017::writeGPIOAB(uint16_t ba) {	Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);	wiresend(MCP23017_GPIOA);	wiresend(ba & 0xFF);	wiresend(ba >> 8);	Wire.endTransmission();}

//-----------------------------------------------------//	This function clear a single register//  RegAdd  = Register address//	i2caddr = device address (0 to 7. See A0, A1 e A2 configurations)void MCP23017::ClearReg(uint8_t RegAdd, uint8_t i2caddr) {	if (i2caddr > 7) { i2caddr = 7; }	Wire.beginTransmission(MCP23017_HW_ADD | i2caddr);	wiresend(RegAdd);	wiresend(0x00);	Wire.endTransmission();	}

	void MCP23017::SetAllRegBank1(uint8_t i2caddr) {		uint8_t Count = 0;				if (i2caddr > 7) { i2caddr = 7; }		UpdateArrayDataBank1();		Wire.beginTransmission(MCP23017_HW_ADD | i2caddr);		wiresend(MCP23017_BNK1_IODIRA);		do {			wiresend(ConfReg[Count]);		} while (Count++ < sizeof(ConfReg)); 		Wire.endTransmission();	}

void Adafruit_MCP23017::begin(uint8_t addr) {  if (addr > 7) {    addr = 7;  }  i2caddr = addr;  Wire.begin();    // set defaults!  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_IODIRA);  wiresend(0xFF);  // all inputs on port A  Wire.endTransmission();  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_IODIRB);  wiresend(0xFF);  // all inputs on port B  Wire.endTransmission();      //default IOCON register pairs GPA and GPB interrupt outputs  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_IOCONA);  wiresend(0x40);    Wire.endTransmission();    Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_IOCONB);  wiresend(0x40);    Wire.endTransmission();}

void Adafruit_NFCShield_I2C::wiresendcommand(uint8_t* cmd, uint8_t cmdlen) {  uint8_t checksum;  cmdlen++;  #ifdef PN532DEBUG  Serial.print("/nSending: ");#endif  delay(2);     // or whatever the delay is for waking up the board  // I2C START  Wire.beginTransmission(PN532_I2C_ADDRESS);  checksum = PN532_PREAMBLE + PN532_PREAMBLE + PN532_STARTCODE2;  wiresend(PN532_PREAMBLE);  wiresend(PN532_PREAMBLE);  wiresend(PN532_STARTCODE2);  wiresend(cmdlen);  wiresend(~cmdlen + 1);   wiresend(PN532_HOSTTOPN532);  checksum += PN532_HOSTTOPN532;#ifdef PN532DEBUG  Serial.print(" 0x"); Serial.print(PN532_PREAMBLE, HEX);  Serial.print(" 0x"); Serial.print(PN532_PREAMBLE, HEX);  Serial.print(" 0x"); Serial.print(PN532_STARTCODE2, HEX);  Serial.print(" 0x"); Serial.print(cmdlen, HEX);  Serial.print(" 0x"); Serial.print(~cmdlen + 1, HEX);  Serial.print(" 0x"); Serial.print(PN532_HOSTTOPN532, HEX);#endif  for (uint8_t i=0; i<cmdlen-1; i++) {   wiresend(cmd[i]);   checksum += cmd[i];#ifdef PN532DEBUG   Serial.print(" 0x"); Serial.print(cmd[i], HEX);#endif  }    wiresend(~checksum);  wiresend(PN532_POSTAMBLE);    // I2C STOP  Wire.endTransmission();#ifdef PN532DEBUG  Serial.print(" 0x"); Serial.print(~checksum, HEX);  Serial.print(" 0x"); Serial.print(PN532_POSTAMBLE, HEX);  Serial.println();#endif} 

//Added to default library//From the Adafruit_RGBLCDShield library we learn that the//buttons are on bits 0..4, which are on GPIOA,//so we use GPINTENA, INTCONA and IOCONA.void Adafruit_MCP23017::enableButtonInterrupt() {  uint8_t data;  //Enable the interrupts on the button pins 0..4  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_GPINTENA);  Wire.endTransmission();  Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);  data = wirerecv();  data |= 0x1F; //Bits 0..4 high, to enable IOC  //Write the new value back  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_GPINTENA);  wiresend(data);  Wire.endTransmission();    //We set INTCONA bits 0..4 to 0 = State change interrupt  //(instead of compare to state)  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_INTCONA);  Wire.endTransmission();  Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);  data = wirerecv();  data &= ~0x1F; //Force bits 0..4 to low    //Write the new value back  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_INTCONA);  wiresend(data);  Wire.endTransmission();  //We set the INTA pin to Active-Low  //first read current register value  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_IOCONA);  Wire.endTransmission();  Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);  data = wirerecv();  //Bit 1 = INTPOL = Low = Active-Low  //(When disabled or no interrupt, signal is high)  data &= ~0x02;  //Bit 2 = ODR = Low = Open Drain disabled  data &= ~0x04;  //Bit 6 = MIRROR = Low = INTA/INTB seperate  data &= ~0x40;    //Write the new value back  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(MCP23017_IOCONA);  wiresend(data);  Wire.endTransmission();}

void MCP23017::begin(uint8_t addr) {	if (addr > 7) {		addr = 7;	}	i2caddr = addr;	Wire.begin();	// set defaults!	Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);	wiresend(MCP23017_IODIRA);	wiresend(0xFF);  // all inputs on port A	Wire.endTransmission();	Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);	wiresend(MCP23017_IODIRB);	wiresend(0xFF);  // all inputs on port B	Wire.endTransmission();}

void MCP23017::digitalWrite(uint8_t p, uint8_t d) {  uint8_t gpio;  uint8_t gpioaddr, olataddr;  // only 16 bits!  if (p > 15)    return;  if (p < 8) {    olataddr = MCP23017_OLATA;    gpioaddr = MCP23017_GPIOA;  } else {    olataddr = MCP23017_OLATB;    gpioaddr = MCP23017_GPIOB;    p -= 8;  }  // read the current GPIO output latches  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(olataddr);	  Wire.endTransmission();    Wire.requestFrom(MCP23017_ADDRESS | i2caddr, 1);   gpio = wirerecv();  // set the pin and direction  if (d == HIGH) {    gpio |= 1 << p;   } else {    gpio &= ~(1 << p);  }  // write the new GPIO  Wire.beginTransmission(MCP23017_ADDRESS | i2caddr);  wiresend(gpioaddr);  wiresend(gpio);	  Wire.endTransmission();}

void TLC59116::writeRegister(uint8_t reg, uint8_t val) {    Wire.beginTransmission(TLC59116_BASEADDR | (_addr & 0x0F));    wiresend(reg);    wiresend(val);    Wire.endTransmission();}

void LiquidTWI2::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {  // SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!  // according to datasheet, we need at least 40ms after power rises above 2.7V  // before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50  delay(50);  Wire.begin();  uint8_t result;#if defined(MCP23017)&&defined(MCP23008)  if (_mcpType == LTI_TYPE_MCP23017) {#endif#ifdef MCP23017    /* don't think we need this    // set defaults!    Wire.beginTransmission(MCP23017_ADDRESS | _i2cAddr);    wiresend(MCP23017_IODIRA);    wiresend(0xFF);  // all inputs on port A    result = Wire.endTransmission();#ifdef DETECT_DEVICE    if (result) {        if (_deviceDetected == 2) {          _deviceDetected = 0;          return;        }    }#endif 	      Wire.beginTransmission(MCP23017_ADDRESS | _i2cAddr);    wiresend(MCP23017_IODIRB);    wiresend(0xFF);  // all inputs on port B    result = Wire.endTransmission();#ifdef DETECT_DEVICE    if (result) {        if (_deviceDetected == 2) {          _deviceDetected = 0;          return;        }    }#endif     */    // now set up input/output pins    Wire.beginTransmission(MCP23017_ADDRESS | _i2cAddr);    wiresend(MCP23017_IODIRA);    wiresend(0x0F); // buttons input, all others output    result = Wire.endTransmission();#ifdef DETECT_DEVICE    if (result) {        if (_deviceDetected == 2) {          _deviceDetected = 0;          return;        }    }#endif         // set the button pullups    Wire.beginTransmission(MCP23017_ADDRESS | _i2cAddr);    wiresend(MCP23017_GPPUA);    wiresend(0x0F);	    result = Wire.endTransmission();#ifdef DETECT_DEVICE    if (result) {        if (_deviceDetected == 2) {          _deviceDetected = 0;          return;        }    }#endif    // now set up input/output pins    Wire.beginTransmission(MCP23017_ADDRESS | _i2cAddr);    wiresend(MCP23017_GPIOA);    wiresend(0x00); // buttons input, all others output    result = Wire.endTransmission();#ifdef DETECT_DEVICE    if (result) {        if (_deviceDetected == 2) {          _deviceDetected = 0;          return;        }    }#endif    // set button input polarity    Wire.beginTransmission(MCP23017_ADDRESS | _i2cAddr);    wiresend(MCP23017_IPOLA);    wiresend(0x0F);	    result = Wire.endTransmission();#ifdef DETECT_DEVICE    if (result) {        if (_deviceDetected == 2) {          _deviceDetected = 0;          return;        }    }#endif    // set button input polarity    Wire.beginTransmission(MCP23017_ADDRESS | _i2cAddr);//.........这里部分代码省略.........