public int Reset()
{
int res;
if (!_isAvailable)
{
return(-1);
}
lock (_i2cBus)
res = I2CNativeLib.i2c_smbus_write_byte(_i2cBus.BusHandle, (byte)SI7021CMD.RESET);
return(res);
}
public ushort ReadWord(SI7021CMD cmd)
{
ushort data = 0;
int res;
byte[] buffer = new byte[3];
int count = 0;
if (!_isAvailable)
{
return(0);
}
lock (_i2cBus)
{
byte bCMD = (byte)cmd;
res = I2CNativeLib.i2c_smbus_write_byte(_i2cBus.BusHandle, bCMD);
if (res < 0)
{
Console.WriteLine("Error write command");
return(0);
}
//Wait for conversion to be finished ..
Thread.Sleep(20);
res = -1;
while (res < 0 && count < 100) //Sometime the sensor still not finish it will return -1..
{
//Use low level I2C read to continue reading until we get data from sensor..
//I tried block read but it didn't work.. :P
res = I2CNativeLib.ReadBytes(_i2cBus.BusHandle, 0x40, buffer, buffer.Length);
//Console.WriteLine("Read number: " + count.ToString() + "Res: " + res.ToString());
count++;
if (res > 0)
{
data = (ushort)((int)buffer[0] << 8);
data += buffer[1];
break;
}
}
return(data);
}
}
