Pololu - Pololu USB AVR Programmer User's Guide - Roboweb.net

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Pololu USB AVR Programmer User's Guide© 2001–2011 Pololu CorporationPuTTY is a free Windows terminal program that can send and receive bytes on aserial port.If you need to send and receive non-ASCII bytes, you can use the Pololu Serial Transmitter Utility forWindows [http://www.pololu.com/docs/0J23].You can also write a computer program to use the serial port. The freely available Microsoft .NET frameworkcontains a SerialPort class that makes it easy to read and write bytes from a serial port. Here is some example C#.NET code that uses a serial port:// Choose the port name and the baud rate.System.IO.Ports.SerialPort port = new System.IO.Ports.SerialPort("COM4", 115200);// Connect to the port.port.Open();// Transmit two bytes on the TX line: 1, 2port.Write(new byte[]{1, 2}, 0, 2);// Wait for a byte to be received on the RX line.int response = port.ReadByte();// Show the user what byte was received.MessageBox.Show("Received byte: " + response);// Disconnect from the port so that other programs can use it.port.Close();6.a. Communicating via the Serial Control LinesFirmware version 1.04 (released on April 29th, 2011) fixes a problem with the RTS and DTR controlsignal outputs. If you want to use those outputs, you should upgrade your firmware to version 1.04.Please see Section 9 for information about upgrading your firmware.Firmware version 1.03 (released on December 22nd, 2010) inverts the TTL serial port’s controlsignals so that 0 V corresponds to 1 and 5 V corresponds to 0, making it consistent with otherUSB-to-TTL-serial adapters. Prior to version 1.03, the opposite convention was used.In addition to transmitting bytes on the TX line and receiving bytes on the RX line, the USB-to-TTL-serial adaptercan use programmer pins A and B as serial handshaking lines of your choosing. Each pin can be configured as6. Communicating via the USB-to-TTL-Serial Adapter Page 42 of 53
Pololu USB AVR Programmer User's Guide© 2001–2011 Pololu Corporationan input or an output by identifying it with a serial handshaking line. The table below shows which handshakinglines are available (CTS is not available because there is no provision for it in the USB CDC ACM subclass).Direction Name .NET System.IO.Ports.SerialPort memberOutput DTR DtrEnableOutput RTS RtsEnableInput CD CDHoldingInput DSR DsrHoldingInput RI N/ABy default, pins A and B are high-impedance inputs that are not identified with any handshaking line. To usepins A and/or B, you must configure them to be serial handshaking lines using the Pololu USB AVR ProgrammerConfiguration Utility (see Section 3.e). The programmer stores the configuration in persistent memory.Pins A and B can be identified with serial handshaking lines using the Pololu USB AVRProgrammer Configuration Utility.After your have associated pins A and/or B with serial handshaking lines, you can take advantage of the I/Ocapabilities of A and B. For input lines, this means you can get a digital reading of the voltage on the line overUSB. For output lines, this means you can set the voltage on the line over USB. A voltage of 0 V corresponds toa logical 1, while a voltage of 1 V corresponds to a logical 0.6. Communicating via the USB-to-TTL-Serial Adapter Page 43 of 53
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Pololu - Pololu USB AVR Programmer User's Guide - Roboweb.net

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