1300 Henley Court
Pullman, WA 99163
509.334.6306
www.digilentinc.com
Wi-FIRE™ Board Reference Manual
Revised April 12, 2017
This manual applies to the Wi-FIRE rev. D
DOC#: 502-302
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 1 of 23
Production Release
The production boards of the Wi-FIRE are manufactured using the Microchip PIC32MZ2048EFG100 MCU. Earlier
pre-production, Rev B and earlier, uses the PIC32MZ2048ECG100 MCU. The MCUs are pin for pin compatible,
however the PIC32MZ2048EFG100 has substantially improved ADCs, and there is an FPU coprocessor. For the most
part, code written to the pre-production Wi-FIRE will run unaltered on the Rev C or newer Wi-FIREs, with the
exception of the ADCs. The Digilent core will support either MCU, even with respect to the new ADCs, as long as
the Arduino hardware abstraction API, analogRead(), was used; no sketch source code change is required. The
production PCB is identical between the Rev B and Rev C, with the exception of the silk screen to indicate Rev C.
Rev D boards now include a new header for MIPS JTAG debugging and iFlowtrace and a few hardware changes to
support this connector. Most components on the board remained the same, although nearly all of the silk screen
designators were changed from Rev C.
Overview
The Wi-FIRE is based on the popular Arduino™ open-source hardware prototyping platform and adds the
performance of the Microchip PIC32MZ microcontroller. The Wi-FIRE has a WiFi MRF24 and SD card on the board,
both with dedicated SPI signals. The Wi-FIRE board takes advantage of the powerful PIC32MZ2048EFG
microcontroller. This microcontroller features a 32-bit MIPS M5150 processor core running at 200 MHhz, 2MB of
flash program memory, and 512K of RAM data memory. The Wi-FIRE can be programmed using the Arduino IDE
with the Digilent Core. It contains everything needed to start developing embedded applications. The Wi-FIRE
features a USB serial port interface for connection to the Arduino IDE and can be powered via USB or by an
external power supply. In addition, the Wi-FIRE is fully compatible with the advanced Microchip MPLAB®X IDE and
works with all MPLAB ®X compatible in-system programmer/debuggers, such as the Microchip PICkit™3 or the
Digilent® chipKIT PGM. The Wi-FIRE is easy to use and suitable for both beginners and advanced users
experimenting with electronics and embedded control systems.
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 2 of 23
The Wi-FIRE board.
Microchip® PIC32MZ2048EFG100
microcontroller (200 MHz 32-bit MIPS
M5150, 2MB Flash, 512K RAM)
Microchip MRF24WG0MA WiFi module
Micro SD card connector
USB 2.0 Hi-Speed OTG controller with A
and micro-AB connectors
50 MHz SPI
43 available I/O pins
Four user LEDs
PC connection uses a USB A > micro B
cable (not included)
12 analog inputs
3.3 V operating voltage
200MHz operating frequency
7 V to 15 V input voltage
(recommended)
30 V input voltage (maximum)
0 V to 3.3 V analog input voltage range
High efficiency, switching 3.3 V power
supply providing low power operation
1 Wi-FIRE Hardware Overview
The Wi-FIRE has the following hardware features:
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 3 of 23
Call Out
Component Description
Call Out
Component Description
1
IC3 – Microchip MRF24WG0MA WiFi
Module
14
JP5 – Host USB Bus Power Enable
2
Reset
15
JP4 – USB Overcurrent Detect
3
JP7 – Reset Disable
16
J6 – Analog and Digital Signal Connector
4
Potentiometer
17
JP1 – 3.3 V / 5.0 V Shield Voltage Select
5
JP2 – Microchip Debug Tool Connector
18
J1 – Shield Power Connector
6
J4 – I2C Signals
19
J15 – 5.0 V Regulator Configuration
7
J5 – Digital Signal Connector
20
J13 – Power Select Jumper
8
PIC32 Microcontroller
21
User Buttons
9
J6 – Digital Signal Connector
22
J12 – External Power Connector Pin
Connector
10
User LEDs
23
J15 – External Power Connector Barrel
Jack
11
J8 – SPI Connector
24
JTAG/TRACE Programming/Debugging
Header
12
JP6 – USB Host or OTG Select
25
USB connector for USB Serial Converter
13
J10 & J11 – USB Connectors
26
Serial Communication LEDs
Table 1. Hardware description.
2 Arduino IDE and USB Serial Communications
The Wi-FIRE board is designed to be used with the Arduino IDE with the Digilent core. Users can learn how to
download the Digilent Core for the Arduino IDE from our guide here.
The Arduino IDE uses a serial communications port to communicate with a boot loader running on the Wi-FIRE
board. The serial port on the Wi-FIRE board is implemented using an FTDI FT232RQ USB serial converter. Before
attempting to use the Arduino IDE to communicate with the Wi-FIRE, the appropriate USB device driver must be
installed; when you connect the Wi-FIRE on a Windows machine, the appropriate driver should install
automatically.
The Wi-FIRE board uses a standard mini-USB connector. Generally, a USB A to micro-B cable is used for connection
to a USB port on the PC.
When the Arduino IDE needs to communicate with the Wi-FIRE board, the board is reset and starts running the
boot loader. The Arduino IDE then establishes communications with the boot loader and uploads the program to
the board.
When the Arduino IDE 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.
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 4 of 23
This automatic reset action (when the serial communications connection is opened) can be disabled. To disable
this operation, there is a jumper labeled JP7, which can be disconnected. JP7 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 Wi-FIRE and the PC over
the serial connection.
3 Power Supply
The Wi-FIRE is designed to be powered via USB (J16), from an external power supply (J12 or J14), or from the USB
OTG receptacle (J10). Jumper block J13 is used to select which power supply is used. The power supply voltage
selected by J13 is applied to the unregulated power bus, VU.
In order to operate the Wi-FIRE as a USB device powered from the USB serial interface, (connector J16), place a
shorting block in the UART position of jumper block J13. To operate the Wi-FIRE from an external power supply,
attach the power supply to either J12 or J14 and place a shorting block in the EXT position of J13. Be sure to
observe correct polarity when connecting a power supply to J12, as a reversed connection could damage the
board. To operate the Wi-FIRE as a USB powered device from the USB OTG connector (J10), place a shorting block
on the USB position of J13. This will normally only be done when running a sketch on the board that programs it to
operate as a USB device. The power supply section in the Wi-FIRE provides two voltage regulators, a 3.3 V
regulator and a 5 V regulator. All systems on the Wi-FIRE board itself operate at 3.3 V and are powered by the 3.3
V regulator. The 5 V regulator is used to provide power for external circuits, such as shields, that require 5 V for
operation and to supply USB 5.0 V when the Wi-FIRE is used as a USB Host. The 5 V regulator can be completely
disabled if it is not needed for a given application.
When a shield is used, connector J1 provides power to the shield. Connector J1 pin 8 provides VIN as applied by
the external power source J12 or J14. If no power is provided to J12 or J14, VIN will not be powered. For most
shields, pin 5 on connector J1 would provide 5.0 V to the shield; however, the Wi-FIRE is not 5 V tolerant and it
would be very easy for a shield to destroy an input if 5.0 V were applied to the PIC32MZ. For this reason, JP1 was
added to control the voltage supplied to the shield’s 5 V source. By default, JP1 is loaded to supply only 3.3 V on
the 5.0 V pin so that the shield does not get 5 V and thus cannot inadvertently apply 5.0 V to any input to the Wi-
FIRE. If the shield requires 5.0 V to operate, the shield will not work when 3.3 V is applied; JP1 must be selected to
provide 5.0 V for the shield to work. However, extreme caution should be used when selecting 5.0 V on JP1 to
ensure that the shield will observe IOREF and not supply 5.0 V to any input to the Wi-FIRE; as this will damage the
input to the PIC32MZ on the Wi-FIRE.
The Wi-FIRE board is designed for low power operation and efficient use of battery power; a switching mode
voltage regulator is used for the 3.3 V power supply. This switching mode regulator is made up of a Microchip
MCP16301 and associated circuitry. It can operate on input voltages from 4 V to 30 V with up to 96% efficiency,
and is rated for 600 mA total current output. The MCP16301 has internal short circuit protection and thermal
protection. The 3.3 V regulator takes its input from the unregulated power bus, VU, and produces its output on the
VCC3V3 power bus. The VCC3V3 bus provides power to all on-board systems and is available at the shield power
connector (J1) to provide 3.3 V power to external circuitry, such as shields.
The 5 V regulator section provides a low dropout linear regulator. The 5.0 regulator is provided for powering
external circuitry that needs a 5 V power supply, such as providing for USB 5.0 V when the Wi-FIRE is used as a USB
Host, or to provide 5.0 V to the shield on J1 with JP1 selected to 5.0 V. This voltage regulator uses an On
Semiconductor NCP1117LP. The NCP1117LP is rated for an output current of 1A. The dropout voltage of the
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 5 of 23
NCP1117LP is a maximum of 1.4 V at 1A output current. The maximum input voltage of the NCP1117LP is 18 V. The
recommended maximum operating voltage is 15 V. However, if the 5.0 V regulator is completely disable by
removing all jumpers on J15, the external input voltage applied to J12 or J14 may be as high as the 30 V as limited
by the switching mode 3.3 V regulator.
The input voltage to the 5 V regulator is taken from the VU bus, and the output is placed on the VCC5V0 power
bus. There is a reverse polarity protection diode in the external power supply circuit. Considering the diode drop
plus the forward drop across the regulator, the minimum input voltage to the regulator should be 7 V to produce a
reliable 5 V output.
For input voltages above 9 V, the regulator will get extremely hot when drawing high currents. The NCP1117LP has
output short circuit protection as well as internal thermal protection and will shut down automatically to prevent
damage.
The 5 V regulator selection on J15 provides four 5 V power configurations:
1) 5 V regulator completely disabled and no 5 V power available;
2) 5 V regulator bypassed and 5 V provided from an external 5 V power supply, such as USB;
3) on-board 5 V regulator used to provide 5 V power;
4) External 5 V regulator used to regulate VU and provide 5 V power.
Jumper block J15 is used to select these various options and the following diagrams describe the use of J13. This
diagram shows the arrangement of the signals on J15:
Signals
Description
LDO In
The input to the on-board linear regulator.
LDO Out
The output of the on-board regulator.
VU
The unregulated input voltage selected by the jumper setting jumper block J13.
5V0
The connection to the VCC5V0 power bus on the Wi-FIRE board.
EN Ext
Signal provided to enable an external voltage regulator, if one is being used. This would allow
the sketch running on the Wi-FIRE to turn on/off the external voltage regulator. When used
with an external voltage regulator, this allows the board to go into an extremely low power
operating mode. This signal is connected to Port D, bit 13 (RD13) on the PIC32 microcontroller.
This is accessible using digital pin 40.
GND
Connection to the digital ground bus on the Wi-FIRE board.
Table 2. Description of signals on J15.
To completely disable operation of the on-board linear regulator, remove all shorting blocks from J15. To use the
on-board 5 V regulator, use the provided shorting blocks to connect VU to LDO In, and to connect LDO Out to 5V0,
as follows:
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 6 of 23
Note: In this case, when J13 is in the EXT position, and J15 is jumpered to regulate the external input, do not apply
more than 18 V. This can destroy the 5.0 V regulator.
To bypass the on-board 5 V regulator when powering the board from an externally regulator 5 V power supply,
such as USB, use one of the provided shorting blocks to connect VU to 5V0, as follows:
An external 5 V regulator can be used. This would be desirable, for example, when operating from batteries. An
external switching mode 5 V regulator could be used to provide higher power efficiency than the on-board linear
regulator. In this case, use wires as appropriate to connect VU to the unregulated input of the external regulator.
Connect the regulated 5 V output to 5V0. Connect GND to the ground connection of the external regulator.
Optionally, connect EN Ext to the enable input control of the external regulator, if available. This allows the
external regulator to be turned off for low power operation. Digital pin 50 is then used to turn on/off the external
regulator.
The PIC32MZ microcontroller is rated to use a maximum of 60 mA of current when operating at 200 MHz. The
MRF24WG0MA WiFi module typically consumes a maximum of 237 mA when transmitting. This allows
approximately 303 mA of current to power the remaining 3.3 V circuitry on the Wi-FIRE board and external
circuitry powered from the VCC3V3 bus. No circuitry on the Wi-FIRE board is powered from the VCC5V0 power
bus, leaving all current available from the 5 V regulator to power external circuitry and the USB 5.0 V power bus
when the Wi-FIRE is used as a USB Host.
The POWER connector (J1) is used to power shields connected to the Wi-FIRE board. Pin 1 is unconnected, the
following pins are provided on this connector:
IOREF (pin 2): This pin is tied to the VCC3V3 bus.
RST (pin 3): This connects to the MCLR pin on the PIC32 microcontroller and can be used to reset the
PIC32.
3V3 (pin 4): This routes the 3.3 V power bus to shields.
5V0 (pin 5): This routes 3.3 V or 5.0 V power to shields depending on the position of JP1.
GND (pin 6, 7): This provides a common ground connection between the Wi-FIRE and the shields. This
common ground is also accessible on connector J3.
VIN (pin 8): This connects to the voltage provided at the external power supply connectors (J12 and J14).
This can be used to provide unregulated input power to the shield. It can also be used to power the Wi-
FIRE board from the shield instead of from the external power connector. If no power is supplied at J12 or
J14 or from the shield, VIN will not have any power on it.
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 7 of 23
4 5 V Compatibility
The PIC32 microcontroller operates at 3.3 V. The original Arduino boards operate at 5 V, as do many Arduino
shields.
There are two issues to consider when dealing with 5 V compatibility for 3.3 V logic. The first is protection of 3.3 V
inputs from damage caused by 5 V signals. The second is whether the 3.3 V output is high enough to be recognized
as a logic high value by a 5 V input.
The digital I/O pins on the PIC32 microcontroller are 5 V tolerant. The, whereas the analog capable I/O pins are not
5 V tolerant. There are 48 analog capable I/O pins on the PIC32MZ, and this applies to most GPIO pins on the
processor. Historically, clamp diodes and current limiting resistors have been used to protect the analog capable
I/O from being damaged but because of the large number of analog capable I/Os and because clamp diodes and
resistors will limit the maximum speed at which these I/Os will operate, it was decided that the Wi-FIRE would not
be 5 V tolerant. Instead, JP1 was added to allow for the 5V0 bus to the shield to be selectable between 3.3 V or 5.0
V. If 5.0 V is selected, great care must be used to ensure that no input to the PIC32MZ exceeds 3.6 V as that will
damage the PIC32MZ.
The minimum high-voltage output of the PIC32 microcontroller is rated at 2.4 V when sourcing 12 mA of current.
When driving a high impedance input (typical of CMOS logic) the output high voltage will be close to 3.3 V. Some 5
V devices will recognize this voltage as a logic high input, and some won’t. Many 5 V logic devices will work reliably
with 3.3 V inputs.
5 Input / Output Connections
The Wi-FIRE board provides 43 of the I/O pins from the PIC32 microcontroller at pins on the input/output
connectors J4, J5, J6, J7, and J8.
The PIC32 microcontroller can source or sink a maximum of 15 mA on all digital I/O pins; however, some pins can
source or sink 25 mA or even 33 mA, check with the PIC32MZ datasheet for more information. To keep the output
voltage within the specified output voltage range (VOL 0.4 V, VOH 2.4 V) the pin current must be restricted to +/-
10 mA on the 15 mA pins, or for the higher current pins check the PIC32MZ datasheet for the maximum currents.
The maximum current that can be sourced or sunk across all I/O pins simultaneously is +/- 150 mA. The maximum
voltage that can be applied to any I/O pin is 3.6 V. For more detailed specifications, refer to the PIC32MZ Data
Sheet available from www.microchip.com.
The Arduino system uses logical pin numbers to identify digital I/O pins on the connectors. The logical pin numbers
for the I/O pins on the Wi-FIRE are 0-42. These pin numbers are labeled in the silk screen on the board. Additional
pins 43-70 allow access to the on board components such as the uSD, MRF24 WiFi radio, User LEDs / BTNs, and
POT.
Pins 0-7 and 27-33 are available on header J6 on the outer and inner row of pins, respectively. Pins 8-13 and 34-41
are available on header J5 on the outer and inner row of pins, respectively. Pin 42 is also available on the outer pin
labeled “A” on the silkscreen on header J5; it is normally for the reference voltage for the microcontrollers ADC,
but it can also be used as a digital I/O pin.
Analog input pins A0 through A12 are available on header J7 with A0-A5 on the outer row of pins and A6-A12 on
the inner row of pins. The pins on the header J7 can also be used as digital pins rather than just analog pins 14-25
with 14-19 on the outer row of pins and 20-25 on the inner row of pins.
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 8 of 23
In addition to the connector pin on header J5, Pin 13 also connects to the user LED LD1. Pin 43, 44, and 45 connect
to user LEDs LD2, LD3, and LD4, but do not attach to any connector. Pins 46 and 47 connect to Buttons BTN1 and
BTN2 and do not attach to any connector.
6 802.11b/g Interface
The 802.11b/g compatible WiFi interface on the Wi-FIRE is provided by a Microchip MRF24WG0MA WiFi module.
This module provides the radio transceiver, antenna, and 802.11 compatible network firmware.
The MRF24WG0MA firmware provides the 802.11 network protocol software support. The DEIPcK and DEWFcK
libraries provide the TCP/IP network protocol support that works with the 802.11 protocol support provided by the
WiFi module.
The primary communications interface with the MRF24WG0MA WiFi module is a 4 wire SPI bus. This SPI bus uses
SPI4 in the PIC32 microcontroller, and this SPI controller is dedicated to use for communications with the WiFi
module.
The WiFi module supports SPI clock speeds up to 25MHz. In addition to the SPI interface, the interface to the WiFi
module also includes a reset signal, an interrupt signal and a hibernate signal. The active low RESET signal is used
to reset the WiFi module The external interrupt signal, INT, is used by the module to signal to the host
microcontroller that it needs servicing by the microcontroller software. The INT signal on the WiFi module is
connected to external interrupt INT4 on the PIC32 microcontroller and is not routed to any connector. The active
low HIBERNATE signal is used to power the WiFi module down and puts it into a low power state.
The interface signals to the WiFi module are controlled by the network libraries and are not normally accessed by
the user sketch. Refer to the schematic for the Wi-FIRE board for details on these connections.
More detailed information about the operation of the MRF24WG0MA can be obtained from the manufacturer
data sheet available from www.microchip.com.
7 Network Library Software
The WiFi module on the Wi-FIRE is intended for use with the Digilent Embedded network libraries, DEIPcK and
DEWFcK. The DEIPcK library provides TCP/UDP/IP protocol support for all compatible network interfaces
supported by Digilent products, including the Wi-FIRE. The DEWFcK library provides the additional library support
required for connecting to and operating with the Microchip MRF24WG0MA wireless network modules. Caution
should be used in understanding that the DEIPcK library is different than the DNETcK network libraries. DEIPcK is
the Digilent Embedded Open Source IP stack that supports both the MX and MZ processor lines, while the DNETcK
IP stack is built on top of the Microchip MLA proprietary stack and only supports the MX processor line, and will
not work with the Wi-FIRE.
The DEWFcK library supports the MRF24WG0MA WiFi module as loaded on the Wi-FIRE. The correct header file
must be used to specify the network hardware being used by the sketch. When writing a network sketch on the
Wi-FIRE, use the following hardware library:
#include <MRF24G.h>
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 9 of 23
The Digilent Embedded network libraries are available as part of the Digilent core (Arduino IDE) download at
our installing the Digilent Core guide. If you have previously installed the Digilent Network Stack as a 3rd party
library, you will need to delete the Network libraries from your 3rd party sketchbook\libraries subdirectory and use
the one installed with the Digilent Core (Arduino IDE). Having both libraries installed will cause compile time
errors.
There are reference examples demonstrating the use of these libraries as part of the examples code downloaded
with the Digilent core (Arduino IDE).
8 USB Interface
The PIC32MZ microcontroller on the Wi-FIRE contains a USB 2.0 Compliant, Hi/Full-Speed Device and On-The-Go
(OTG) controller. This controller provides the following features:
USB Hi or Full speed host and device support.
Low speed host support.
USB OTG support.
Endpoint buffering anywhere in system RAM.
Integrated DMA to access system RAM and Flash memory
Connector J12 is a standard USB type A receptacle. This connector will be used when the Wi-FIRE has been
programmed to operate as a USB embedded host. The USB device is connected either directly to the Wi-FIRE, or
via cable to this connector.
Connector J11, on the bottom of the board, is the Device/OTG connector. This is a standard USB micro-AB
connector. Connect a cable with a micro-A plug (optionally available from Digilent) from this connector to an
available USB port on a PC or USB hub for device operation.
The USB specification allows for two types of devices with regard to how they are powered: self-powered devices
and bus powered devices. A self-powered device is one that is powered from a separate power supply and does
not draw power from the USB bus. A bus powered device is one that draws power from the USB bus and does not
have a separate power supply. The Wi-FIRE can be operated as a self-powered device or as a bus powered device
from either the USB serial connector (J16) or the USB OTG/device connector (J10).
For operation as a self-powered device, place a shorting block on the EXT position of J13 and connect a suitable
external power supply to either J12 or J14.
To operate the Wi-FIRE as a bus powered device powered from the USB serial connector (J16), place a shorting
block in the UART position of J13. To operate as a bus powered device powered from the OTG/device connector
(J10), place a shorting block in the USB position of J13.
Note that there are two completely independent USB interfaces on the Wi-FIRE board, and it is possible for the Wi-
FIRE to appear as two different USB devices at the same time. These two devices can be connected to two
different USB ports on the same host, or to USB ports on two different hosts. If the Wi-FIRE board is connected to
two different USB hosts simultaneously, there will be a common ground connection between these two hosts
through the Wi-FIRE board. In this case, it is possible for ground current to flow through the Wi-FIRE board,
possibly damaging one or the other USB host if they do not share a common earth ground connection.
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 10 of 23
When the Wi-FIRE is operating as a bus powered device using USB connector J16, it will appear as a self-powered
device from the perspective of a USB host connected to J10. Similarly, when operating as a bus powered device
from connector J10, it will appear as a self-powered device from the perspective of connector J16.
A USB host is expected to be able to provide bus power to USB devices connected to it. Therefore, when operating
as a USB host, the Wi-FIRE should normally be externally powered. Connect a power supply to the external power
connector, J15. It is possible to operate the Wi-FIRE as a USB host powered from USB connector J16; however, in
this case, the host USB port will be providing power for the Wi-FIRE as well as the USB device connected to the Wi-
FIRE. In this case, ensure that the total load does not exceed the 500 mA maximum load that a USB device is
allowed to present to the host.
The USB host provides regulated 5 V power to the connected USB device. The internal 5 V LDO regulator can be
used to provide the USB power when operating from an external power supply. Place shorting blocks on jumper
block J15, as described above in the power supply section.
If the external power supply being used is a regulated 5 V supply, place a shorting block between pins VU and 5V0
on connector J15, as described above in the power supply section to bypass the on board 5.0 V regulator.
The power supply used must be able to supply enough current to power both the Wi-FIRE, and the attached USB
device, since the Wi-FIRE provides power to the attached USB device when operating as a host. The USB 2.0
specification requires that the host provide at least 100 mA to the device.
Jumper JP6 is used to provide the required USB host capacitance to the host connector being used. Place the
shorting block in the “A” position when using the standard USB type A (host) Connector (J11). Place the shorting
block in the “AB” position for use with the USB micro-AB (OTG) connector (J10).
With JP5 shorted, Digilent pin 25 drives the enable input of a TPS2051B Current-Limited Power Distribution Switch
to supply 5 V USB power to the host connector. This switch has over-current detection capability and provides an
over-current fault indication by pulling the signal USBOC low. The over-current output pin can be monitored via
the Digilent pin 8 (RA14/INT3) when JP4 is shorted. Details about the operation of the TPS2051B can be obtained
from the data sheet available at www.ti.com.
When using the Wi-FIRE outside the Arduino IDE environment, the Microchip Harmony Library provides USB stack
code that can be used with the board. There are reference designs available on the Microchip web site
demonstrating both device and host operation of PIC32 microcontrollers. These reference designs can be modified
for developing USB firmware for the Wi-FIRE.
9 SD Card Interface
The micro-SD card connector provides the ability to access data stored on micro-SD sized flash memory cards using
the SD card library provided as part of the Arduino IDE software system.
The SD card is accessed using an SPI interface on PIC32 microcontroller pins dedicated to this purpose. The Arduino
IDE SD library uses a “bit-banged” software SPI implementation to talk to SD card. However, software can be
written to access the SD card using SPI3.
On the Wi-FIRE board, SPI3 and I/O pins used to communicate with the SD card are dedicated to that function and
are not shared with other uses.
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 11 of 23
10 Peripheral I/O Functions
The PIC32 microcontroller on the Wi-FIRE board provides a number of peripheral functions. The provided
peripherals are explained in the following sections.
10.1 UART Ports
UART 4: Asynchronous serial port. Pin 0 (RX), Pin 1 (TX). This is accessed using the runtime object: Serial. These
pins are connected to I/O connector J6 and are also connected to the FT232RQ USB serial converter. It is possible
to use these pins to connect to an external serial device when not using the FT232RQ USB serial interface. This
uses UART4 (U4RX, U4TX) on the PIC32 microcontroller.
UART 1: Asynchronous serial port. Pin 39 (RX), Pin 40 (TX). This is accessed using the runtime object: Serial1. This
uses UART1 (U1RX, U1TX) on the PIC32 microcontroller.
10.2 SPI
Synchronous serial port. Pin 10 (SS), Pin 11 (MOSI), Pin 12 (MISO), Pin 13 (SCK). This can be accessed using the SPI
standard library. It can also be accessed using the DSPI0 object from the DSPI standard library. This uses SPI2 (SS2,
SDI2, SDO2, SCK2) on the PIC32 microcontroller. These signals also appear on connector J5. Be aware that pin 13
(SCK) is shared with USER LED1, and that both LED1 and the SPI port cannot be used concurrently.
SPI1: Synchronous serial port. This is an additional SPI interface on the PIC32 microcontroller that can be assessed
using the DSPI1 object from the DSPI standard library. SS1 is accessed via digital pin number 7. SDO1 is accessed
via digital pin 35. SDI1 is accessed via digital pin 36. SCK1 is connected to digital pin 5.
10.3
𝐈
𝟐
C
Synchronous serial interface. The PIC32 microcontroller shares analog pins A4 and A5 with the two I2C signals, SDA
and SCL. This uses I2C4 (SDA4, SCL4) on the PIC32 microcontroller. Both SDA4 and SCL4 are accessible on
connector J4.
Note: The I2C bus uses open collector drivers to allow multiple devices to drive the bus signals. This means that
external pull-up resistors must be provided to supply the logic high state for the signals.
10.4 PWM
Pulse width modulated output; Pins 3 (OC1), 5 (OC2), 6 (OC3), 9 (OC4), 10 (OC9), and 11 (OC7). These can be
accessed using the analogWrite() runtime function.
10.5 External Interrupts
Pin 3 (INT0), Pin 2 (INT1), Pin 7 (INT2), Pin 8 (INT3), Pin 59 (INT4). Note that the pin numbers for INT0 and INT4 are
different than on some other Digilent boards. INT4 is dedicated for use with the MRF24WG0MA WiFi module and
is not brought out to a connector pin.
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 12 of 23
10.6 User LEDs
Pin 13 (LD1), Pin 43 (LD2), Pin 44 (LD3), Pin 45 (LD4). Pin 13 is shared between a connector pin and the LED. Pin 43,
44, and 45 only goes to the LED and are not brought out to any connector pin. Driving the pin HIGH turns
the LED on, driving it LOW turns it off.
10.7 User Push Buttons
There are two push button switches, which are labeled BTN1 (pin 46), and BTN2 (pin 47). The digitalRead()
function will return LOW if the button is not pressed and HIGH when the button is pressed.
10.8 A/D Converter Reference
Labeled A, the left-most outer pin on connector J5. This is used to provide an external voltage reference to
determine the input voltage range of the analog pins. The maximum voltage that can be applied to this pin is 3.3 V.
This pin can also be used as digital pin 42.
10.9 Potentiometer
A potentiometer (pot) is provided on the board to be used as an analog signal source or analog control input. The
pot is a 10 kΩ trimmer pot connected between the VCC3V3 supply and ground. The wiper of the pot is connected
to analog input A12 or Digilent pin 48. The pot is read using the analogRead() function.
10.10 VU Voltage Monitor
The supply voltage as provided by J13 can be monitored on analog input A13 or digital pin 49. The voltage
presented to the analog input is 1/11th of the actual VU voltage. This allows for a supply voltage between 2.2 V to
30 V to be monitored and still fall within the range of 0 to 3.3 V on the analog input. By doing an analogRead(49),
the supply voltage can be monitored.
10.11 RTCC
The PIC32 microcontroller contains an RTCC circuit that can be used to maintain time and date information. The
operation of the RTCC requires a 32.768 kHhz frequency source. Crystal X1 (not loaded), just above and to the
right of the PIC32 microcontroller IC, is provided for you to solder a 32 kHhz watch crystal. The Citizen CFS206-
32.768KDZF-UB crystal can be used in this location.
UPDATE: At this time, the PIC32MZ processor does not support crystals as a source for the secondary clock and an
oscillator must be used. The unloaded circuit as provided may not be usable for an RTCCsource.
10.12 RESET
The PIC32 microcontroller is reset by bringing its MCLR pin low. The MCLR pin is connected to the RST pin, as
presented on J1.
As previously described earlier, reset of the PIC32 microcontroller can be initiated by the USB serial converter. The
USB serial converter brings the DTR pin low to reset the microcontroller. Jumper JP7 can be used to enable/disable
the ability for the USB serial converter to initiate a reset.
The RST is connected to pin 3 of connector J1. This allows circuitry on a shield to reset the microcontroller, or to
ensure that the circuitry on the shield is reset at the same time as the microcontroller.
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 13 of 23
Connector J8 provides access to the SPI bus. Pin 5 provides access to the SPI Slave Select signal (SS).
On Arduino boards, the corresponding connector is also used as an in-system programming connector as well as
providing access to some of the SPI signals. On Arduino boards, pin 5 of this connector is connected to the reset
net.
Some Arduino shields, most notably the Ethernet shield, connect pin 5 on J8 to the reset net on pin 3 of connector
J1. This causes the processor to be reset each time an attempt is made to access the SPI port. Jumper JP3 can be
used to break the connection between J8 pin 5 and reset when using Arduino shields that make this connection.
JP3 has a cuttable trace on the top of the board that can be cut to break the connection between SPI SS and reset.
JP3 is not loaded at the factory. To restore the connection, solder a two pin header at the JP3 position and install a
shorting block.
A reset button is located to the right of the MRF24WG0MA WiFi module. Pressing this button resets the PIC32
microcontroller.
11 Microchip Development Tool Compatibility
In addition to being used with the Arduino IDE, the Wi-FIRE board can be used as a more traditional
microcontroller development board using Microchip Development Tools.
Unloaded connector JP2 on the right side of the MRF24WG0MA WiFi module is used to connect to a Microchip
development tool, such as the PICkit™3. The holes for JP2 are staggered so that a standard 100-mil spaced 6-pin
header can fit to the board without the need to solder it in place. Any Microchip development tool that supports
the PIC32MZ microcontroller family, and that can be connected via the same 6-pin ICSP interface as the PICkit™3,
can be used.
Typically, a standard male connector and a 6-pin cable is used with JP2 so that a PICkit™3 can be attached to the
Wi-FIRE board.
The Digilent chipKIT PGM can also be used in place of a PICkit3 to program the Wi-FIRE with the Microchip
Development tools. The chipKIT PGM has a smaller form factor and does not need a 6-pin cable to connect to JP2.
The Microchip MPLAB ®X IDE can be used to program and debug code running on the Wi-FIRE board. The MPLAB
®X IDE can be downloaded from the Microchip web site. Please note that Microchip’s MPLAB® V8 and earlier IDEs
cannot be used with the Wi-FIRE, as those versions of MPLAB® IDE do not support the MZ processor.
Using the Microchip development tools to program the Wi-FIRE board will cause the boot loader to be erased. To
use the board with the Arduino IDE again, it is necessary to program the boot loader back onto the board. The
boot loader HEX file can be found at on the Wi-FIRE Resource Center. To reprogram the bootloader, use the
Microchip IPE which comes with the MPLAB ®X tool set. The bootloader cannot be easily reprogrammed directly
with the MPLAB ®X IDE.
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 14 of 23
12 Programming and Debugging with OpenOCD through
the EJTAG/Trace Connector
OpenOCD (Open On-Chip Debugger) is a system that provides debugging, in-system programming, and boundary-
scan testing for embedded target devices. For the Wi-FIRE, users may use the OpenOCD directly with the Wi-FIRE
through the primary programming UART port.
Header J17 provides a EJTAG header where users may attach a debugging adapter such as the Bus Blaster v3C to
use with OpenOCD.
More information on how to use OpenOCD Debug with the Wi-FIRE can be found via MIPS Debug OpenOCD with
Bus Blaster Getting Started Guide available on the Imagination Technologies website.
13 Pinout Tables
The following tables show the relationship between the digital pin numbers, the connector pin numbers, and the
microcontroller pin numbers.
In the following tables, columns labeled Digilent pin # refer to the digital pin number. This is the value that is
passed to the pinMode(), digitalRead(), digitalWrite() and other functions which refer to the pin.
13.1 Pinout Table by Digilent Pin Number
Digilent
Pin #
MCU
Pin
Port
Bit
PIC32 Signal Name
Function
0
57
RF02
EBIRDY3/RPF2/SDA3/RF2
GPIO, U4RX
1
58
RF08
EBIRDY2/RPF8/SCL3/RF8
GPIO, U4TX
2
18
RE08
AN25/AERXD0/RPE8/RE8
GPIO, IC1, INT1
3
71
RD00
EMDIO/AEMDIO/RPD0/RTCC/INT0/RD0
PWM 1, INT0, OC1
4
60
RA03
EBIRDY1/SDA2/RA3
GPIO
5
76
RD01
RPD1/SCK1/RD1
PWM 2, OC2
6
77
RD02
EBID14/ETXEN/RPD2/PMD14/RD2
PWM 3, OC3
7
19
RE09
AN26/AERXD1/RPE9/RE9
GPIO, IC2, INT2
8
66
RA14
AETXCLK/RPA14/SCL1/RA14
GPIO, IC3, INT3
9
78
RD03
EBID15/ETXCLK/RPD3/PMD15/RD3
PWM 4, OC4
10
16
RG09
EBIA2/AN11/C2INC/ERXCLK/EREFCLK/AERXCLK/AEREF
CLK/RPG9/PMA2/RG9
SPI_SS2, PWM 5, OC9,
IC6
11
70
RD11
EMDC/AEMDC/RPD11/RD11
SPI_SDO2/SDI2 PWM 6,
OC7
12
85
RF00
EBID11/ETXD1/RPF0/PMD11/RF0
SPI_SDI2/SDO2, T5CK(+)
13
10
RG06
AN14/C1IND/ECOL/RPG6/SCK2/RG6
SPI_SCK2, USER LED1
14
20
RB05
AN45/C1INA/RPB5/RB5
AIN0, GPIO
15
33
RB09
EBIA7/AN49/RPB9/PMA7/RB9
AIN1, GPIO
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 15 of 23
Digilent
Pin #
MCU
Pin
Port
Bit
PIC32 Signal Name
Function
16
7
RC02
EBIA12/AN21/RPC2/PMA12/RC2
AIN2, GPIO
17
44
RB15
EBIA0/AN10/ERXD3/AETXD2/RPB15/OCFB/PMA0/RB
15
AIN3, GPIO
18
11
RG07
EBIA4/AN13/C1INC/ECRS/RPG7/SDA4/PMA4/RG7
AIN4, SDA
19
12
RG08
EBIA3/AN12/C2IND/ERXDV/ECRSDV/AERXDV/AECRSD
V/RPG8/SCL4/PMA3/RG8
AIN5, SCL
20
22
RB03
AN3/C2INA/RPB3/RB3
AIN6, GPIO
21
23
RB02
AN2/C2INB/RPB2/RB2
AIN7, GPIO
22
21
RB04
AN4/C1INB/RB4
AIN8, GPIO
23
24
RB01
PGEC1/AN1/RPB1/RB1
AIN9, GPIO
24
32
RB08
EBIA10/AN48/RPB8/PMA10/RB8
AIN10, GPIO
25
25
RB00
PGED1/AN0/RPB0/RB0
AIN11, GPIO,
P32_VBUSON
26
91
RE00
EBID0/PMD0/RE0
GPIO
27
94
RE01
EBID1/PMD1/RE1
GPIO
28
98
RE02
EBID2/PMD2/RE2
GPIO
29
99
RE03
EBID3/RPE3/PMD3/RE3
GPIO
30
100
RE04
EBID4/AN18/PMD4/RE4
GPIO
31
3
RE05
EBID5/AN17/RPE5/PMD5/RE5
GPIO
32
4
RE06
EBID6/AN16/PMD6/RE6
GPIO
33
5
RE07
EBID7/AN15/PMD7/RE7
GPIO
34
82
RD05
SQICS1/RPD5/RD5
GPIO, T4CK
35
6
RC01
EBIA6/AN22/RPC1/PMA6/RC1
GPIO, T2CK, IC7
36
86
RF01
EBID10/ETXD0/RPF1/PMD10/RF1
GPIO, T6CK
37
59
RA02
EBICS0/SCL2/RA2
GPIO
38
79
RD12
EBID12/ETXD2/RPD12/PMD12/RD12
GPIO, T3Ck
39
47
RD14
AN32/AETXD0/RPD14/RD14
GPIO, U1RX
40
48
RD15
AN33/AETXD1/RPD15/SCK6/RD15
GPIO, U1TX
41
28
RA09
VREF-/CVREF-/AN27/AERXD2/RA9
GPIO, VREF-
42
29
RA10
VREF+/CVREF+/AN28/AERXD3/RA10
VREF+
43
81
RD04
SQICS0/RPD4/RD4
USER_LED2
44
35
RB11
AN6/ERXERR/AETXERR/RB11
USER_LED3
45
1
RG15
AN23/AERXERR/RG15
USER_LED4
46
2
RA05
EBIA5/AN34/PMA5/RA5
BTN1
47
61
RA04
EBIA14/PMCS1/PMA14/RA4
BTN2
48
42
RB13
AN8/ERXD1/AECOL/RB13
AIN12/POT
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 16 of 23
Digilent
Pin #
MCU
Pin
Port
Bit
PIC32 Signal Name
Function
49
41
RB12
EBIA11/AN7/ERXD0/AECRS/PMA11/RB12
AIN13/POWER SUPPLY
MONITOR
50
80
RD13
EBID13/ETXD3/PMD13/RD13
5V POWER ENABLE
51
43
RB14
EBIA1/AN9/ERXD2/AETXD3/RPB14/SCK3/PMA1/RB14
SD_SCK3
52
8
RC03
EBIWE/AN20/RPC3/PMWR/RC3
SD_SS3
53
34
RB10
EBIA13/CVREFOUT/AN5/RPB10/PMA13/RB10
SD_SDI3
54
9
RC04
EBIOE/AN19/RPC4/PMRD/RC4
SD_SDO3
55
69
RD10
RPD10/SCK4/RD10
MRF24_SCK4
56
68
RD09
EBIA15/RPD9/PMCS2/PMA15/RD9
MRF24_SS4
57
65
RF05
EBIA8/RPF5/SCL5/PMA8/RF5
MRF24_SDI4
58
88
RG00
EBID8/RPG0/PMD8/RG0
MRF24 SDO4
59
67
RA15
AETXEN/RPA15/SDA1/RA15
MRF24_INT4
60
87
RG01
EBID9/ETXERR/RPG1/PMD9/RG1
MRF24_HIBERNATE
61
64
RF04
EBIA9/RPF4/SDA5/PMA9/RF4
MRF24_RESET
62
38
RA01
TCK/EBIA19/AN29/RA1
TCK
63
17
RA00
TMS/EBIA16/AN24/RA0
TMS
64
40
RF12
TDO/EBIA17/AN31/RPF12/RF12
TDO
65
39
RF13
TDI/EBIA18/AN30/RPF13/SCK5/RF13
TDI
66
89
RA06
TRCLK/SQICLK/RA6
TRCLK
67
97
RG13
TRD0/SQID0/RG13
TRD0
68
96
RG12
TRD1/SQID1/RG12
TRD1
69
95
RG14
TRD2/SQID2/RG14
TRD2
70
90
RA07
TRD3/SQID3/RA7
TRD3
N/A
13
VSS
POWER
N/A
14
VDD
POWER
N/A
15
MCLR
MCLR, ICSP
N/A
26
RB06
PGEC2/AN46/RPB6/RB6
ICSP
N/A
27
RB07
PGED2/AN47/RPB7/RB7
ICSP
N/A
30
AVDD
POWER
N/A
31
AVSS
POWER
N/A
36
VSS
POWER
N/A
37
VDD
POWER
N/A
45
VSS
POWER
N/A
46
VDD
POWER
N/A
49
RC12
OSCI/CLKI/RC12
XTAL
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 17 of 23
Digilent
Pin #
MCU
Pin
Port
Bit
PIC32 Signal Name
Function
N/A
50
RC15
OSCO/CLKO/RC15
XTAL
N/A
51
VBUS
POWER
N/A
52
VUSB3V3
POWER
N/A
53
VSS
POWER
N/A
54
D-
PIC32_USBD-
N/A
55
D+
PIC32_USBD+
N/A
56
RF03
USBID/RPF3/RF3
PIC32_USBID
N/A
62
VDD
POWER
N/A
63
VSS
POWER
N/A
72
RC13
SOSCI/RPC13/RC13
SOSC XTAL
N/A
73
RC14
SOSCO/RPC14/T1CK/RC14
SOSC XTAL
N/A
74
VDD
POWER
N/A
75
VSS
POWER
N/A
83
VDD
POWER
N/A
84
VSS
POWER
N/A
92
VSS
POWER
N/A
93
RF02
VDD
POWER
13.2 Pinout Table by MCU Pin and Port Bit Numbers
Port
Bit
Digilent
Pin #
MCU
Pin
PIC32 Signal Name
Function
RA00
63
17
TMS/EBIA16/AN24/RA0
TMS
RA01
62
38
TCK/EBIA19/AN29/RA1
TCK
RA02
37
59
EBICS0/SCL2/RA2
GPIO
RA03
4
60
EBIRDY1/SDA2/RA3
GPIO
RA04
47
61
EBIA14/PMCS1/PMA14/RA4
BTN2
RA05
46
2
EBIA5/AN34/PMA5/RA5
BTN1
RA06
66
89
TRCLK/SQICLK/RA6
TRCLK
RA07
70
90
TRD3/SQID3/RA7
TRD3
RA09
41
28
VREF-/CVREF-/AN27/AERXD2/RA9
GPIO, VREF-
RA10
42
29
VREF+/CVREF+/AN28/AERXD3/RA10
VREF+
RA14
8
66
AETXCLK/RPA14/SCL1/RA14
GPIO, IC3, INT3
RA15
59
67
AETXEN/RPA15/SDA1/RA15
MRF24_INT4
RB00
25
25
PGED1/AN0/RPB0/RB0
AIN11, GPIO,
P32_VBUSON
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 18 of 23
Port
Bit
Digilent
Pin #
MCU
Pin
PIC32 Signal Name
Function
RB01
23
24
PGEC1/AN1/RPB1/RB1
AIN9, GPIO
RB02
21
23
AN2/C2INB/RPB2/RB2
AIN7, GPIO
RB03
20
22
AN3/C2INA/RPB3/RB3
AIN6, GPIO
RB04
22
21
AN4/C1INB/RB4
AIN8, GPIO
RB05
14
20
AN45/C1INA/RPB5/RB5
AIN0, GPIO
RB06
N/A
26
PGEC2/AN46/RPB6/RB6
ICSP
RB07
N/A
27
PGED2/AN47/RPB7/RB7
ICSP
RB08
24
32
EBIA10/AN48/RPB8/PMA10/RB8
AIN10, GPIO
RB09
15
33
EBIA7/AN49/RPB9/PMA7/RB9
AIN1, GPIO
RB10
53
34
EBIA13/CVREFOUT/AN5/RPB10/PMA13/RB10
SD_SDI3
RB11
44
35
AN6/ERXERR/AETXERR/RB11
USER_LED3
RB12
49
41
EBIA11/AN7/ERXD0/AECRS/PMA11/RB12
AIN13/POWER SUPPLY
MONITOR
RB13
48
42
AN8/ERXD1/AECOL/RB13
AIN12/POT
RB14
51
43
EBIA1/AN9/ERXD2/AETXD3/RPB14/SCK3/PMA1/RB1
4
SD_SCK3
RB15
17
44
EBIA0/AN10/ERXD3/AETXD2/RPB15/OCFB/PMA0/RB
15
AIN3, GPIO
RC01
35
6
EBIA6/AN22/RPC1/PMA6/RC1
GPIO, T2CK, IC7
RC02
16
7
EBIA12/AN21/RPC2/PMA12/RC2
AIN2, GPIO
RC03
52
8
EBIWE/AN20/RPC3/PMWR/RC3
SD_SS3
RC04
54
9
EBIOE/AN19/RPC4/PMRD/RC4
SD_SDO3
RC12
N/A
49
OSCI/CLKI/RC12
XTAL
RC13
N/A
72
SOSCI/RPC13/RC13
SOSC XTAL
RC14
N/A
73
SOSCO/RPC14/T1CK/RC14
SOSC XTAL
RC15
N/A
50
OSCO/CLKO/RC15
XTAL
RD00
3
71
EMDIO/AEMDIO/RPD0/RTCC/INT0/RD0
PWM 1, INT0, OC1
RD01
5
76
RPD1/SCK1/RD1
PWM 2, OC2
RD02
6
77
EBID14/ETXEN/RPD2/PMD14/RD2
PWM 3, OC3
RD03
9
78
EBID15/ETXCLK/RPD3/PMD15/RD3
PWM 4, OC4
RD04
43
81
SQICS0/RPD4/RD4
USER_LED2
RD05
34
82
SQICS1/RPD5/RD5
GPIO, T4CK
RD09
56
68
EBIA15/RPD9/PMCS2/PMA15/RD9
MRF24_SS4
RD10
55
69
RPD10/SCK4/RD10
MRF24_SCK4
RD11
11
70
EMDC/AEMDC/RPD11/RD11
SPI_SDO2/SDI2 PWM 6,
OC7
RD12
38
79
EBID12/ETXD2/RPD12/PMD12/RD12
GPIO, T3Ck
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 19 of 23
Port
Bit
Digilent
Pin #
MCU
Pin
PIC32 Signal Name
Function
RD13
50
80
EBID13/ETXD3/PMD13/RD13
5V POWER ENABLE
RD14
39
47
AN32/AETXD0/RPD14/RD14
GPIO, U1RX
RD15
40
48
AN33/AETXD1/RPD15/SCK6/RD15
GPIO, U1TX
RE00
26
91
EBID0/PMD0/RE0
GPIO
RE01
27
94
EBID1/PMD1/RE1
GPIO
RE02
28
98
EBID2/PMD2/RE2
GPIO
RE03
29
99
EBID3/RPE3/PMD3/RE3
GPIO
RE04
30
100
EBID4/AN18/PMD4/RE4
GPIO
RE05
31
3
EBID5/AN17/RPE5/PMD5/RE5
GPIO
RE06
32
4
EBID6/AN16/PMD6/RE6
GPIO
RE07
33
5
EBID7/AN15/PMD7/RE7
GPIO
RE08
2
18
AN25/AERXD0/RPE8/RE8
GPIO, IC1, INT1
RE09
7
19
AN26/AERXD1/RPE9/RE9
GPIO, IC2, INT2
RF00
12
85
EBID11/ETXD1/RPF0/PMD11/RF0
SPI_SDI2/SDO2, T5CK(+)
RF01
36
86
EBID10/ETXD0/RPF1/PMD10/RF1
GPIO, T6CK
RF02
0
57
EBIRDY3/RPF2/SDA3/RF2
GPIO, U4RX
RF03
N/A
56
USBID/RPF3/RF3
PIC32_USBID
RF04
61
64
EBIA9/RPF4/SDA5/PMA9/RF4
MRF24_RESET
RF05
57
65
EBIA8/RPF5/SCL5/PMA8/RF5
MRF24_SDI4
RF08
1
58
EBIRDY2/RPF8/SCL3/RF8
GPIO, U4TX
RF12
64
40
TDO/EBIA17/AN31/RPF12/RF12
TDO
RF13
65
39
TDI/EBIA18/AN30/RPF13/SCK5/RF13
TDI
RG00
58
88
EBID8/RPG0/PMD8/RG0
MRF24 SDO4
RG01
60
87
EBID9/ETXERR/RPG1/PMD9/RG1
MRF24_HIBERNATE
RG06
13
10
AN14/C1IND/ECOL/RPG6/SCK2/RG6
SPI_SCK2, USER LED1
RG07
18
11
EBIA4/AN13/C1INC/ECRS/RPG7/SDA4/PMA4/RG7
AIN4, SDA
RG08
19
12
EBIA3/AN12/C2IND/ERXDV/ECRSDV/AERXDV/AECRS
DV/RPG8/SCL4/PMA3/RG8
AIN5, SCL
RG09
10
16
EBIA2/AN11/C2INC/ERXCLK/EREFCLK/AERXCLK/AERE
FCLK/RPG9/PMA2/RG9
SPI_SS2, PWM 5, OC9,
IC6
RG12
68
96
TRD1/SQID1/RG12
TRD1
RG13
67
97
TRD0/SQID0/RG13
TRD0
RG14
69
95
TRD2/SQID2/RG14
TRD2
RG15
45
1
AN23/AERXERR/RG15
USER_LED4
N/A
13
VSS
POWER
N/A
14
VDD
POWER
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 20 of 23
Port
Bit
Digilent
Pin #
MCU
Pin
PIC32 Signal Name
Function
N/A
15
MCLR
MCLR, ICSP
N/A
30
AVDD
POWER
N/A
31
AVSS
POWER
N/A
36
VSS
POWER
N/A
37
VDD
POWER
N/A
45
VSS
POWER
N/A
46
VDD
POWER
N/A
51
VBUS
POWER
N/A
52
VUSB3V3
POWER
N/A
53
VSS
POWER
N/A
54
D-
PIC32_USBD-
N/A
55
D+
PIC32_USBD+
N/A
62
VDD
POWER
N/A
63
VSS
POWER
N/A
74
VDD
POWER
N/A
75
VSS
POWER
N/A
83
VDD
POWER
N/A
84
VSS
POWER
N/A
92
VSS
POWER
N/A
93
VDD
POWER
13.3 Pinout Table by PIC32 Microcontroller Pin
MCU
Pin
Port
Bit
Digilent
Pin #
PIC32 Signal Name
Function
1
RG15
45
AN23/AERXERR/RG15
USER_LED4
2
RA05
46
EBIA5/AN34/PMA5/RA5
BTN1
3
RE05
31
EBID5/AN17/RPE5/PMD5/RE5
GPIO
4
RE06
32
EBID6/AN16/PMD6/RE6
GPIO
5
RE07
33
EBID7/AN15/PMD7/RE7
GPIO
6
RC01
35
EBIA6/AN22/RPC1/PMA6/RC1
GPIO, T2CK, IC7
7
RC02
16
EBIA12/AN21/RPC2/PMA12/RC2
AIN2, GPIO
8
RC03
52
EBIWE/AN20/RPC3/PMWR/RC3
SD_SS3
9
RC04
54
EBIOE/AN19/RPC4/PMRD/RC4
SD_SDO3
10
RG06
13
AN14/C1IND/ECOL/RPG6/SCK2/RG6
SPI_SCK2, USER LED1
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 21 of 23
MCU
Pin
Port
Bit
Digilent
Pin #
PIC32 Signal Name
Function
11
RG07
18
EBIA4/AN13/C1INC/ECRS/RPG7/SDA4/PMA4/RG7
AIN4, SDA
12
RG08
19
EBIA3/AN12/C2IND/ERXDV/ECRSDV/AERXDV/AECRS
DV/RPG8/SCL4/PMA3/RG8
AIN5, SCL
13
N/A
VSS
POWER
14
N/A
VDD
POWER
15
N/A
MCLR
MCLR, ICSP
16
RG09
10
EBIA2/AN11/C2INC/ERXCLK/EREFCLK/AERXCLK/AERE
FCLK/RPG9/PMA2/RG9
SPI_SS2, PWM 5, OC9,
IC6
17
RA00
63
TMS/EBIA16/AN24/RA0
TMS
18
RE08
2
AN25/AERXD0/RPE8/RE8
GPIO, IC1, INT1
19
RE09
7
AN26/AERXD1/RPE9/RE9
GPIO, IC2, INT2
20
RB05
14
AN45/C1INA/RPB5/RB5
AIN0, GPIO
21
RB04
22
AN4/C1INB/RB4
AIN8, GPIO
22
RB03
20
AN3/C2INA/RPB3/RB3
AIN6, GPIO
23
RB02
21
AN2/C2INB/RPB2/RB2
AIN7, GPIO
24
RB01
23
PGEC1/AN1/RPB1/RB1
AIN9, GPIO
25
RB00
25
PGED1/AN0/RPB0/RB0
AIN11, GPIO,
P32_VBUSON
26
RB06
N/A
PGEC2/AN46/RPB6/RB6
ICSP
27
RB07
N/A
PGED2/AN47/RPB7/RB7
ICSP
28
RA09
41
VREF-/CVREF-/AN27/AERXD2/RA9
GPIO, VREF-
29
RA10
42
VREF+/CVREF+/AN28/AERXD3/RA10
VREF+
30
N/A
AVDD
POWER
31
N/A
AVSS
POWER
32
RB08
24
EBIA10/AN48/RPB8/PMA10/RB8
AIN10, GPIO
33
RB09
15
EBIA7/AN49/RPB9/PMA7/RB9
AIN1, GPIO
34
RB10
53
EBIA13/CVREFOUT/AN5/RPB10/PMA13/RB10
SD_SDI3
35
RB11
44
AN6/ERXERR/AETXERR/RB11
USER_LED3
36
N/A
VSS
POWER
37
N/A
VDD
POWER
38
RA01
62
TCK/EBIA19/AN29/RA1
TCK
39
RF13
65
TDI/EBIA18/AN30/RPF13/SCK5/RF13
TDI
40
RF12
64
TDO/EBIA17/AN31/RPF12/RF12
TDO
41
RB12
49
EBIA11/AN7/ERXD0/AECRS/PMA11/RB12
AIN13/POWER SUPPLY
MONITOR
42
RB13
48
AN8/ERXD1/AECOL/RB13
AIN12/POT
43
RB14
51
EBIA1/AN9/ERXD2/AETXD3/RPB14/SCK3/PMA1/RB1
4
SD_SCK3
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 22 of 23
MCU
Pin
Port
Bit
Digilent
Pin #
PIC32 Signal Name
Function
44
RB15
17
EBIA0/AN10/ERXD3/AETXD2/RPB15/OCFB/PMA0/RB
15
AIN3, GPIO
45
N/A
VSS
POWER
46
N/A
VDD
POWER
47
RD14
39
AN32/AETXD0/RPD14/RD14
GPIO, U1RX
48
RD15
40
AN33/AETXD1/RPD15/SCK6/RD15
GPIO, U1TX
49
RC12
N/A
OSCI/CLKI/RC12
XTAL
50
N/A
OSCO/CLKO/RC15
XTAL
51
N/A
VBUS
POWER
52
N/A
VUSB3V3
POWER
53
N/A
VSS
POWER
54
N/A
D-
PIC32_USBD-
55
N/A
D+
PIC32_USBD+
56
RF03
N/A
USBID/RPF3/RF3
PIC32_USBID
57
RF02
0
EBIRDY3/RPF2/SDA3/RF2
GPIO, U4RX
58
RF08
1
EBIRDY2/RPF8/SCL3/RF8
GPIO, U4TX
59
RA02
37
EBICS0/SCL2/RA2
GPIO
60
RA03
4
EBIRDY1/SDA2/RA3
GPIO
61
RA04
47
EBIA14/PMCS1/PMA14/RA4
BTN2
62
N/A
VDD
POWER
63
N/A
VSS
POWER
64
RF04
61
EBIA9/RPF4/SDA5/PMA9/RF4
MRF24_RESET
65
RF05
57
EBIA8/RPF5/SCL5/PMA8/RF5
MRF24_SDI4
66
RA14
8
AETXCLK/RPA14/SCL1/RA14
GPIO, IC3, INT3
67
RA15
59
AETXEN/RPA15/SDA1/RA15
MRF24_INT4
68
RD09
56
EBIA15/RPD9/PMCS2/PMA15/RD9
MRF24_SS4
69
RD10
55
RPD10/SCK4/RD10
MRF24_SCK4
70
RD11
11
EMDC/AEMDC/RPD11/RD11
SPI_SDO2/SDI2 PWM 6,
OC7
71
RD00
3
EMDIO/AEMDIO/RPD0/RTCC/INT0/RD0
PWM 1, INT0, OC1
72
RC13
N/A
SOSCI/RPC13/RC13
SOSC XTAL
73
RC14
N/A
SOSCO/RPC14/T1CK/RC14
SOSC XTAL
74
N/A
VDD
POWER
75
N/A
VSS
POWER
76
RD01
5
RPD1/SCK1/RD1
PWM 2, OC2
77
RD02
6
EBID14/ETXEN/RPD2/PMD14/RD2
PWM 3, OC3
Wi-FIRE™ Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page 23 of 23
MCU
Pin
Port
Bit
Digilent
Pin #
PIC32 Signal Name
Function
78
RD03
9
EBID15/ETXCLK/RPD3/PMD15/RD3
PWM 4, OC4
79
RD12
38
EBID12/ETXD2/RPD12/PMD12/RD12
GPIO, T3Ck
80
RD13
50
EBID13/ETXD3/PMD13/RD13
5V POWER ENABLE
81
RD04
43
SQICS0/RPD4/RD4
USER_LED2
82
RD05
34
SQICS1/RPD5/RD5
GPIO, T4CK
83
N/A
VDD
POWER
84
N/A
VSS
POWER
85
RF00
12
EBID11/ETXD1/RPF0/PMD11/RF0
SPI_SDI2/SDO2, T5CK(+)
86
RF01
36
EBID10/ETXD0/RPF1/PMD10/RF1
GPIO, T6CK
87
RG01
60
EBID9/ETXERR/RPG1/PMD9/RG1
MRF24_HIBERNATE
88
RG00
58
EBID8/RPG0/PMD8/RG0
MRF24 SDO4
89
RA06
66
TRCLK/SQICLK/RA6
TRCLK
90
RA07
70
TRD3/SQID3/RA7
TRD3
91
RE00
26
EBID0/PMD0/RE0
GPIO
92
N/A
VSS
POWER
93
N/A
VDD
POWER
94
RE01
27
EBID1/PMD1/RE1
GPIO
95
RG14
69
TRD2/SQID2/RG14
TRD2
96
RG12
68
TRD1/SQID1/RG12
TRD1
97
RG13
67
TRD0/SQID0/RG13
TRD0
98
RE02
28
EBID2/PMD2/RE2
GPIO
99
RE03
29
EBID3/RPE3/PMD3/RE3
GPIO
100
RE04
30
EBID4/AN18/PMD4/RE4
GPIO
