public byte[] ReadBytes(int address, int count)
{
var buf = new byte[count];
var res = I2CNativeLib.ReadBytes(busHandle, address, buf, buf.Length);
if (res == -1)
{
var message = String.Format(
"Error accessing address '{0}': {1}",
address,
UnixMarshal.GetErrorDescription(Stdlib.GetLastError()));
log.Error(message);
throw new IOException(message);
}
if (res <= 0)
{
var message = String.Format("Error reading from address '{0}': I2C transaction failed", address);
log.Error(message);
throw new IOException(message);
}
if (res < count)
{
Array.Resize(ref buf, res);
}
return(buf);
}
public void Open(string busPath)
{
log.Trace("I2C bus opening");
BusPath = busPath;
int res = I2CNativeLib.OpenBus(busPath);
if (res < 0)
{
throw new IOException(String.Format("Error opening bus '{0}': {1}", busPath, UnixMarshal.GetErrorDescription(Stdlib.GetLastError())));
}
busHandle = res;
log.Trace("I2C bus handle - {0}", busHandle);
}
protected virtual void Dispose(bool disposing)
{
log.Trace("Disposing");
if (disposing)
{
// disposing managed resouces
}
if (busHandle != 0)
{
I2CNativeLib.CloseBus(busHandle);
busHandle = 0;
}
}
public void WriteBytes(int address, byte[] bytes)
{
log.Trace("Writing to I2C. Bus handle {0}", busHandle);
var res = I2CNativeLib.WriteBytes(busHandle, address, bytes, bytes.Length);
if (res == -1)
{
string message = String.Format(
"Error accessing address '{0}': {1}",
address,
UnixMarshal.GetErrorDescription(Stdlib.GetLastError()));
log.Error(message);
throw new IOException(message);
}
if (res == -2)
{
var message = String.Format("Error writing to address '{0}': I2C transaction failed", address);
log.Error(message);
throw new IOException(message);
}
}
