C++ readBytes函数代码示例

/**
 * Handle calling a callback function that uses three bytes as parameters
 * e.g. leds, pwmLowSideDrivers
 */
void OpenInterface::callCallbackWithThreeBytes(callbackWithThreeBytes callbackFunction)
{
  uint8_t status[3];
  bool result = readBytes(status, 3);
  if (result && callbackFunction)
  {
    (*callbackFunction)(status[0], status[1], status[2]);
  }
}

/* Read device memory to extract current
 accelerometer and gyroscope values. */
void MPU6050::read6dof(int* ax, int* ay, int* az, int* gx, int* gy, int* gz) {
  readBytes(MPU6050_RA_ACCEL_XOUT_H, 14, buffer);
  *ax = (((int)buffer[0]) << 8) | buffer[1];
  *ay = (((int)buffer[2]) << 8) | buffer[3];
  *az = (((int)buffer[4]) << 8) | buffer[5];
  *gx = (((int)buffer[8]) << 8) | buffer[9];
  *gy = (((int)buffer[10]) << 8) | buffer[11];
  *gz = (((int)buffer[12]) << 8) | buffer[13];
}

void LIS2MDL::readData(int16_t * destination)
{
  uint8_t rawData[6];  // x/y/z mag register data stored here
  readBytes(LIS2MDL_ADDRESS, (0x80 | LIS2MDL_OUTX_L_REG), 8, &rawData[0]);  // Read the 6 raw data registers into data array

  destination[0] = ((int16_t)rawData[1] << 8) | rawData[0] ;       // Turn the MSB and LSB into a signed 16-bit value
  destination[1] = ((int16_t)rawData[3] << 8) | rawData[2] ;  
  destination[2] = ((int16_t)rawData[5] << 8) | rawData[4] ; 
}

size_t DecompressG711ALaw::getSamples(AudioSample *buffer, size_t length)
{
   AudioByte *byteBuff =
      reinterpret_cast<AudioByte *>(buffer);
   size_t read = readBytes(byteBuff,length);
   for(long i=read-1; i>=0; i--)
      buffer[i] = aLawDecodeTable[ byteBuff[i] ];
   return read;
}

int SE_BufferInput::readInt()
{
    int out = 0xFFFFFFFF;
    readBytes((char*)&out, sizeof(int));
    if(mNetOrder)
    {
        out = SE_Util::net2HostInt32(out);
    }
    return out;
}

void getMotion6(int16_t* ax, int16_t* ay, int16_t* az, int16_t* gx, int16_t* gy, int16_t* gz)
{
	readBytes(MPU6050Addr, MPU6050_RA_ACCEL_XOUT_H, 14, buffer);
	*ax = (((int16_t)buffer[0]) << 8) | buffer[1];
	*ay = (((int16_t)buffer[2]) << 8) | buffer[3];
	*az = (((int16_t)buffer[4]) << 8) | buffer[5];
	*gx = (((int16_t)buffer[8]) << 8) | buffer[9];
	*gy = (((int16_t)buffer[10]) << 8) | buffer[11];
	*gz = (((int16_t)buffer[12]) << 8) | buffer[13];
}

static uint64_t
parseCorrupt( tr_torrent *    tor,
              const uint8_t * buf,
              uint32_t        len )
{
    if( len != sizeof( uint64_t ) )
        return 0;
    readBytes( &tor->corruptPrev, &buf, sizeof( uint64_t ) );
    return TR_FR_CORRUPT;
}

size_t DecompressPcm8Unsigned::getSamples(AudioSample * buffer,
                                    size_t length) {
   AudioByte *byteBuff =
      reinterpret_cast<AudioByte *>(buffer);
   size_t samplesRead = readBytes(byteBuff,length);
   for(long i=samplesRead-1; i>=0; i--)
      buffer[i] = static_cast<AudioSample>(byteBuff[i] ^ 0x80)
                  << ((sizeof(AudioSample)-1)*8);
   return samplesRead;
}

static uint64_t
parseUploaded( tr_torrent *    tor,
               const uint8_t * buf,
               uint32_t        len )
{
    if( len != sizeof( uint64_t ) )
        return 0;
    readBytes( &tor->uploadedPrev, &buf, sizeof( uint64_t ) );
    return TR_FR_UPLOADED;
}

int64_t AbstractTransport::readLong()
{
  std::vector<char> longBytes= readBytes(8);
  int64_t result = 0;
  for (int i = 0; i < 8 ; i++) {
    result <<= 8;
    result ^= (int64_t) *(longBytes.data() + i) & 0xFF;
  }
  return result;
}

/** Get 3-axis gyroscope readings.
 * These gyroscope measurement registers, along with the accelerometer
 * measurement registers, temperature measurement registers, and external sensor
 * data registers, are composed of two sets of registers: an internal register
 * set and a user-facing read register set.
 * The data within the gyroscope sensors' internal register set is always
 * updated at the Sample Rate. Meanwhile, the user-facing read register set
 * duplicates the internal register set's data values whenever the serial
 * interface is idle. This guarantees that a burst read of sensor registers will
 * read measurements from the same sampling instant. Note that if burst reads
 * are not used, the user is responsible for ensuring a set of single byte reads
 * correspond to a single sampling instant by checking the Data Ready interrupt.
 *
 * Each 16-bit gyroscope measurement has a full scale defined in FS_SEL
 * (Register 27). For each full scale setting, the gyroscopes' sensitivity per
 * LSB in GYRO_xOUT is shown in the table below:
 *
 * <pre>
 * FS_SEL | Full Scale Range   | LSB Sensitivity
 * -------+--------------------+----------------
 * 0      | +/- 250 degrees/s  | 131 LSB/deg/s
 * 1      | +/- 500 degrees/s  | 65.5 LSB/deg/s
 * 2      | +/- 1000 degrees/s | 32.8 LSB/deg/s
 * 3      | +/- 2000 degrees/s | 16.4 LSB/deg/s
 * </pre>
 *
 * @param x 16-bit signed integer container for X-axis rotation
 * @param y 16-bit signed integer container for Y-axis rotation
 * @param z 16-bit signed integer container for Z-axis rotation
 * @see getMotion6()
 * @see MPU6050_RA_GYRO_XOUT_H
 */
PUBLIC void getRotation(int16* x, int16* y, int16* z) {
	if(gyroEnabled)
	{
		readBytes(LSM6DS0_ADDRESS, OUT_X_L_G, 6, IMUBuffer);
		*x = ((((int16)IMUBuffer[1]) << 8) | IMUBuffer[0]);
		*y = ((((int16)IMUBuffer[3]) << 8) | IMUBuffer[2]);
		*z = ((((int16)IMUBuffer[5]) << 8) | IMUBuffer[4]);
		vWaitMicroseconds(500);
	}
}

void* getEntryScript()
{
	fseek(HE1_File, RoomResource->RMDA->ENCD - 4, SEEK_SET);
	uint32_t length;
	readU32LE(HE1_File, &length);
	length = SWAP_CONSTANT_32(length) - 8;
	void* data = malloc(length);
	readBytes(HE1_File, (uint8_t*)data, length);
	return data;
}

static uint64_t
parseConnections( tr_torrent *    tor,
                  const uint8_t * buf,
                  uint32_t        len )
{
    if( len != sizeof( uint16_t ) )
        return 0;
    readBytes( &tor->maxConnectedPeers, &buf, sizeof( uint16_t ) );
    return TR_FR_MAX_PEERS;
}

/*
 * Read the control register
 */
byte DS1339::readControlRegister() {
  byte ctrlReg = 0;

  if(readBytes(&ctrlReg, DS1339_CONTROL_REG, 1) != 1) {
    // Something went wrong so return -1
    return 0xff;
  }

  return ctrlReg;
}

DS::String DS::Stream::readString(size_t length, DS::StringType format)
{
    String result;
    if (format == e_StringUTF16) {
        chr16_t* buffer = new chr16_t[length];
        ssize_t bytes = readBytes(buffer, length * sizeof(chr16_t));
        DS_DASSERT(bytes == static_cast<ssize_t>(length * sizeof(chr16_t)));
        result = String::FromUtf16(buffer, length);
        delete[] buffer;
    } else {
        chr8_t* buffer = new chr8_t[length];
        ssize_t bytes = readBytes(buffer, length * sizeof(chr8_t));
        DS_DASSERT(bytes == static_cast<ssize_t>(length * sizeof(chr8_t)));
        result = (format == e_StringUTF8) ? String::FromUtf8(buffer, length)
                                          : String::FromRaw(buffer, length);
        delete[] buffer;
    }
    return result;
}