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This app will discard bytes received on the RX line that have framing errors or parity errors, and it will also throw
out bytes if there is an RX buffer overrun. An RX buffer overrun should not happen if you are using a baud rate of
350,000 bps or less.
Example Uses
• The TX line can be used to send commands to a microcontroller or other serial device.
• The RX line can be used to receive data from a microcontroller or other serial device.
• The DTR and RTS lines are general-purpose digital outputs that can be used to control something (such as an
LED) from a computer.
• The DSR and CD lines are general-purpose digital inputs that can be connected to a sensor or other circuit
and read from a computer.
Caveats
• The CC2511’s UARTs do not actually support 1.5 stop bits, so if you try to set the number of stop bits to 1.5,
this app will use 1 stop bit instead.
• The CC2511’s UARTs do not support having 2 stop bits very well, so if you set the number of stop bits to 2,
this app may fail to detect framing errors that occur during the second stop bit. Also, the next byte received after
the framing error occurred may be discarded even if that byte is valid. This problem only applies to receiving
bytes on the RX line; this app has no problem transmitting bytes on the TX line with 2 stop bits.
Caution: The Wixel’s I/O lines are not 5V tolerant. You must use level-shifters, diodes, or voltage dividers
to connect the Wixel to outputs from 5V systems. Also, avoid drawing more current from an I/O line than
it can provide (see the discussion of P1_0 and P1_1 in Section 1.a). Avoid connecting multiple output pins
together.
The Wixel does not support the RS-232 voltage levels typically used by DB9 serial ports. The Wixel’s I/O
lines, including the RX and TX lines, operate on voltages between 0 and 3.3 V. To connect the Wixel to an
RS-232 serial signal, you will need additional level-shifting and inverting hardware like the Pololu 23201a
serial adapter [http://www.pololu.com/product/126] (RS-232 serial is inverted; the Wixel’s serial interface
expects non-inverted serial).
9.d. Serial ASCII-to-Binary App
Overview
This app uses the Wixel’s two UARTs to convert between ASCII characters and “binary” data with arbitrary bytes.
This can be useful if you are programming a controller with a serial interface that is limited to only transmitting ASCII
characters, but you want to control a device with a serial interface that requires you to send arbitrary bytes between
0x00 and 0xFF. This app can act as a translator between your controller and such a device.
Installation Instructions
Download the Serial ASCII-to-Binary App (v1.0) [http://www.pololu.com/file/download/serial-ascii-binary-
v1.0.wxl?file_id=0J640] (17k wxl). Open it with the Wixel Configuration Utility, choose your parameters, and then write
it to a Wixel. See Section 4 for more information on how this is done.
Pololu Wixel User's Guide © 2001–2014 Pololu Corporation
9. Wixel Apps Page 38 of 64
- 1. Overview 3
- Green USB LED 6
- Yellow LED 6
- 2. Contacting Pololu 8
- 3. Getting Started 9
- Wixel in bootloader mode 12
- README.txt 15
- 4. Configuring Your Wixels 20
- App Configuration 21
- Writing to a Wixel 21
- Reading from a Wixel 21
- Other Commands 22
- 5. Connecting Your Wixels 23
- VALT Power Output 24
- Low Power Considerations 24
- 3V3 Power Output 24
- 6. Using a Virtual COM Port 28
- 8. Schematic Diagram 31
- 9. Wixel Apps 32
- Default Pinout 33
- Description 33
- Indicator LEDs 34
- Control Signals 34
- General Parameters 34
- Pin Assignment Parameters 35
- Example Uses 35
- Versions 36
- 9.c. USB-to-Serial App 37
- Overview 37
- Installation Instructions 37
- ASCII-to-Binary conversion 39
- Binary-to-ASCII conversion 39
- Serial specifications 39
- Parameters 39
- Serial Commands 41
- 9.f. I/O Repeater App 44
- Default Settings 45
- 9.g. Joystick App 46
- Wixel Configuration 47
- 9.h. Wireless Tilt Mouse App 49
- Parts Needed 49
- Pinout of Transmitter Wixel 49
- Assembly 50
- Alternative Parts 51
- Mouse Speed Calculation 51
- 9.i. ShiftBrite App 51
- Using the ShiftBrite App 52
- Data Format 52
- Compiling Apps 54
- Creating Your Own Apps 56
- 10.c. Using the Eclipse IDE 56
- Advanced Features of Eclipse 57
- Hiding Unused Features 59
- Contributing your source code 60
- 10.f. Wixel App File Format 61
- The hex section 62
- The license section 62
- The description section 62
- The cdb section 62
- 11. The Wixel USB Bootloader 63
- Startup Procedure 64
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