Digilent 410-302P-KIT - Manual (Page 3)

WiFire Reference Manual
Call Out Component Description Call Out Component Description
1 IC3- Microchip MRF24WG0MA WiFi Module 15 JP8- Hos USB Bus Power Enable
2 User Buttons 16 JP7- USB Overcurrent Detect
3 JP1- Microchip Debug Tool Connector 17 J8- Analog and Digital Signal Connector
4 J6- I 2 C Signals 18 JP9- 3.3v / 5.0v Shield Voltage Select
5 BTN3- Reset 19 J5- Shield Power Connector
6 JP2- Reset Disable 20 J17- 5.0V Regulator Configuration
7 J7- Digital Signal Connector 21 J16- Power Select Jumper
8 PIC32 Microcontroller 22 J13- Micro SD Connector
9 Potentiometer 23 J15- External Power Connector
10 J10- Digital Signal Connector 24 J14- External Power Connector
11 User LEDs 25 J4- USB- UART Handshaking Signals
12 JP6- USB Host or OTG Select 26 USB connector for USB Serial Converter
13 J9- SPI Connector 27 Serial Communication LEDs
14 J12- USB Connectors
Table 1. chipKIT hardware description.
2 MPIDE and USB Serial Communications
The WiFire board is designed to be used with the MPIDE; the MPIDE development platform was created by
modifying the Arduino IDE and is backwards-compatible with the Arduino IDE. Links for where to obtain the MPIDE
installation files, as well as instructions for installing MPIDE, can be found at www.chipkit.net/started.
The MPIDE uses a serial communications port to communicate with a boot loader running on the WiFire board.
The serial port on the WiFire board is implemented using an FTDI FT232RQ USB serial converter. Before attempting
to use the MPIDE to communicate with the WiFire, the appropriate USB device driver must be installed.
The WiFire board uses a standard mini-USB connector. Generally, a USB A to mini-B cable is used for connection to
a USB port on the PC.
When the MPIDE needs to communicate with the WiFire board, the board is reset and starts running the boot
loader. The MPIDE then establishes communications with the boot loader and uploads the program to the board.
When the MPIDE opens the serial communications connection on the PC, the DTR pin on the FT232RQ chip is
driven low. This pin is coupled through a capacitor to the MCLR pin on the PIC32 microcontroller. Driving the MCLR
line low resets the microcontroller, which restarts the execution with the boot loader.
This automatic reset action (when the serial communications connection is opened) can be disabled. To disable
this operation, there is a jumper labeled JP2, which can be disconnected. JP2 is normally shorted, but if the
shorting block is removed, the automatic reset operation will be disabled.
Two red LEDs (LD5 and LD6) will blink when data is being sent or received between the WiFire and the PC over the
serial connection.
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