chipKIT™ DP32™ Reference Manual
Revision:
July 10, 2013
Note:
This document applies to REV B of the board.
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Overview
The chipKIT DP32 is a chipKIT/MPIDE
compatible prototyping and project
development board from Digilent. It
combines the power of the Microchip®
PIC32MX250F128B with a wire wrap
prototyping area, provision for an EEPROM
non-volatile memory, and analog
temperature sensor, a potentiometer,
buttons and LEDs in a single board. The
mounting hole footprint on the board is
designed to fit in the Hammond
1591XXSSBK project box.
The DP32 takes advantage of the powerful
PIC32MX250F128B microcontroller. This
microcontroller features a 32-bit MIPS
processor core running at 40Mhz, 128K of flash program memory and 32K of SRAM data memory. It
is suitable for building projects directly on the board utilizing the provided prototyping area, but it can
also be used as a device programmer to program the microcontrollers for inclusion in custom built
projects.
The DP32 can be programmed using the Multi-Platform Integrated Development Environment,
MPIDE, an environment based on the open source Arduino IDE modified to support the PIC32
microcontroller. The board provides everything needed to start developing embedded applications
using the MPIDE.
The DP32 is also fully compatible with the advanced Microchip MPLAB® IDE. To develop embedded
applications using MPLAB, a separate device programmer/debugger, such as the Digilent chipKIT
PGM or the Microchip PICkit3™ is required.
Features Include:
•
•
•
•
•
•
•
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•
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Microchip® PIC32MX250F128B microcontroller (40/50 MHz 32-bit MIPS, 128K Flash, 32K
SRAM)
5 – 12 Volt recommended operating voltage
19 available I/O pins
Up to 9 analog inputs
1 Potentiometer connected to an analog input
Four user LEDs
Two user push button
Wirewrap prototype area
Provision for an SPI EEPROM and an analog temperature sensor
Mounting Hole compatible with Hammond 1591XXSSBK project box
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Doc: 502-280
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
chipKIT DP32
Functional Description
The PIC32MX250F12B microcontroller features a 32-bit MIPS processor core capable of running at
up to 50 MHz. The DP32 operates the microcontroller at 40Mhz by default.The microcontroller
features 128 KB of flash program memory and 32 KB of SRAM data memory. Programming the DP32
can be done using the Multi-Platform Integrated Development Environment (MPIDE) or with the
advanced Microchip MPLAB® IDE with the addition of a PICKit3 or chipKIT PGM in-system
programmer/debugger.
The DP32 provides 19 I/O pins as located on two through-hole header footprints. Some pins share
functions with the onboard circuits such as the on-board 8 MHz oscillator or USB data lines (see the
schematic for details). If these peripherals are needed in the design then the microcontroller can be
reconfigured to allow these pins can be used for other purposes. Nine of the digital I/O pins are
shared with the analog inputs and can be used as analog input pins.
The PIC32MX250F128B microcontroller supports peripheral functions such as UART, SPI, and I
2
C,
as well as pulse-modulated outputs. To use the peripheral functions the PIC32MX2xx family of
microcontrollers features a mappable I/O system called peripheral pin select (PPS), which allows
select peripheral functionality to be mapped to a multiple pins on the device. The default DP32 board
support files provide a specific mapping of peripheral functions to microcontroller pins. This default
pinout can be over-ridden by the user’s sketch if a different mapping is desired.
Additional features of the board include an 8-pin DIP header labeled IC4 that is mapped for use with a
customer supplied Microchip 25LC256 EEPROM. The SPI bus and power signals are mapped to the
correct pins so that the user can solder in an 8-pin dip socket or directly solder the IC into the holes.
Similarly the IC3 header on the board is mapped for a customer supplied Microchip MCP9701A
analog temperature sensor.
chipKIT DP32 Hardware Overview
The DP32 has the following hardware features:
1. J2 – USB Connector for USB Serial Converter
This connects to a USB port on the PC to provide the communications port for the MPIDE to
talk to the DP32 board. This can also be used to power the DP32 when connected to the PC.
2. JP6 – Microchip Debug Tool Connector
This connector is used to connect Microchip and Digilent programmer/debugger tools, such as
the PICkit™3 or Digilent chipKIT PGM. This allows the DP32 board to be used as a traditional
microcontroller development board using the Microchip MPLAB® IDE.
3. J6 – External Power Screw Terminal Connectors
This screw terminal connector may be used to provide up to 15VDC to the DP32. The polarity
of the terminals is marked on the silkscreen and must be followed to avoid damaging the
board.
4. JP7 – Power Select Jumper
This jumper may be set to either power the DP32 via USB (J2), or Screw Terminal (J6). To
power via USB, set the jumper to short the pins with VIN and VUSB directly to their right. To
power via external supply, short the two pins nearest the screw terminal.
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page 2 of 9
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chipKIT DP32
5. JP1 – USBID Jumper for use with USB OTG
This jumper allows Digital I/O pin 0 (RB5) to be disconnected from the USBID line on the USB
Port. If JP1 is shorted, pin 0 may not operate as expected. Some users may wish to keep JP1
shorted for USB operations.
6. JP2 and JP3 – D+ and D- USB Signals
These jumpers are shipped unloaded. The trace between the two terminals may be cut if USB
functionality is required to be permanently disabled. Once the traces have been cut, it is
possible to solder jumper pins in these locations to re-enable the D+ and D- signals as
desired.
7. IC4 – SPI EEPROM Device (Microchip 25LC256) Loading Point
This 8-pin DIP footprint is designed so that a SPI controlled EEPROM device could be added
at a later time if desired. It is intended that an 8-pin DIP socket or a Microchip 25LC256 device
would be soldered into this location.
8. VR1 – Analog Potentiometer
An analog potentiometer connected to chipKIT analog pin A2. When rotated fully counter
clockwise, 0V is read on the pin. When rotated fully clockwise, 3.3V is read on the pin.
9. User LEDs
Four LEDs connected to digital signal pins 11, 12, 13, and 14.
10. Reset Button
When pressed, the microcontroller resets the currently loaded sketch. If Button 2 (BTN2/PGM)
is held down while pressing the reset button, the microcontroller will start from the boot loader,
allowing a new sketch to be loaded.
11. BTN2/PGM and BTN3 User Buttons
These user buttons are connected to digital signal pins 1 and 17. They produce a logic high
signal when depressed, and a logic low signal when released.
12. JP4/JP5 – Pullup/Pulldown jumpers
These jumpers are used to add pullups or pulldowns to the digital signal pins 2 and 3. Pullups
are necessary when utilizing I
2
C on these two pins. These two jumpers can be used as
settable logic states either pulled high or pulled low depending on the jumper settings. In
addition, if no pullups or pulldowns are desired, the jumper may be safely removed completely,
allowing the pins to be used for other input/output purposes.
13. IC1 PIC32 Microcontroller
The PIC32MX250F128B microcontroller is the main processor for the board.
14. J4 – Digital and Analog I/O Connector #1
The set of Digital I/Os with chipKIT numbers 0 through 8 and Analog pins A0-A2. See table 1
in appendix A for more details.
15. IC3 – Analog Temperature Sensor (Microchip MCP9701A) Loading Point
This 3-pin footprint is intended for an analog temperature sensor to be loaded by the user. It
was designed with the Microchip MCP9701A Linear Active Thermistor in mind. The pin one
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page 3 of 9
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
chipKIT DP32
(square pin) is for VCC3V3 of the device, pin two (center pin) is for the VOUT pin of the
device, and pin three is for the ground pin.
16. J3 – Digital and Analog I/O Connector #2
The set of Digital I/Os with chipKIT numbers 9 through 18 and Analog pins A3-A8. See table 1
in appendix A for more details.
17. Prototyping Area
This area may be used to prototype any desired hardware designs using standard wire
wrapping methods.
Programming the chipKIT DP32
MPIDE Development Tool
The DP32 uses the PIC32MX250F128B onboard USB peripheral to program the microcontroller with
the MPIDE environment. This requires a driver to be installed to accommodate this programing
solution. The driver file is called Stk500v2.inf and is available in the drivers folder in the MPIDE
distribution.
Once the driver is installed and the computer has recognized the board, it is ready to be programmed.
The board has two modes of operation. The first is the bootloader mode, to enter this mode you must
press and hold down BTN2/PGM button while pressing the RESET button then release both to set the
board into program mode. In program mode LD1 will flash to show you that the bootloader is running
and the board is ready to be programmed.
Once the board is programmed it will be reset and will execute the programmed sketch. If there is a
sketch loaded on the board and you cycle power to the board, it will automatically reenter sketch
mode. To exit sketch mode you must press and hold the BTN2/PGM and press RESET button then
release both buttons.
Since the board resets between program mode and sketch mode the serial port will disconnect and
then reconnect. The MPIDE serial monitor will not work unless there is a delay of at least 5 seconds in
the user sketch before it begins to send data to the computer. To ensure the serial monitor is ready it
is recommended that users watch the device manager or similar program for your OS after the reset
to watch for the reconnection of the serial port before attempting to open the Serial Monitor in MPIDE.
The delay is required for proper operation of the serial port so that the board can disconnect and
reconnect to the computer before the DP32 begins sending data out while the OS is not listing. This is
a byproduct of the embedded USB controller solution on the DP32.
Microchip MPLAB® IDE Development Tool Compatibility
In addition to being compatible with the MPIDE, the DP32 board can be used as a more traditional
microcontroller development board using Microchip Development Tools.
The unloaded connector JP6 on the right side of the board is used to connect to a Microchip
development tool, such as the PICkit3™ or the Digilent chipKIT PGM. The holes for JP6 are
staggered so that a standard 100-mil spaced 6-pin header can be press fit to the board without the
need to solder it in place. Any Microchip development tool that supports the PIC32MX2xx
microcontroller family and can be used provided is uses the same 6-pin interface as the PICkit3.
www.digilentinc.com
page 4 of 9
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
chipKIT DP32
Typically, a right-angle male connector is used in JP6 so that a PICkit3 can be attached coplanar with
the DP32 board. The connector can be loaded from the top, or it can be loaded from the bottom. In
either case the programmer will be face down (buttons or LEDs not visible).
The Microchip MPLAB® IDE or the MPLAB® X IDE can be used to program and debug code running
on the DP32 board. These tools can be downloaded from the Microchip website.
Using the Microchip development tools to program the DP32 board will cause the boot loader to be
erased. To use the board with the MPIDE again, it is necessary to program the boot loader back onto
the board. The bootloader image can be downloaded from the DP32 product page on the Digilent
website.
chipKIT DP32 Jumper Settings
JP1
USBID Connect (USB OTG)
Loaded: USBID is connected to Digital I/O pin 0 (RB5) and is usable by the microcontroller.
Unloaded: Pin 0 is unconnected to USBID and freely usable.
JP2
JP3
USB Data+
USB Data-
For most users, these traces should be left uncut. Cutting the trace will remove the ability to program
the microcontroller from the USB Port. Users may optionally add jumper pins and a shorting block to
restore the original functionality of the DP32 if the traces have been cut.
JP4/JP5
Default configuration is with the shorting blocks loaded on pins 1 and 2, which results in pullup
configuration. Shorting pins 2 and 3 results in pulldown operation. Users may choose to remove
shorting blocks entirely if no pullup/pulldown settings are desired.
JP7 Power Select Jumper
Default power select is with the shorting block connecting the two pins directly next to VBUS,
providing power from the USB connector. If external power is desired, connect the two pins nearest
the external power screw terminal labeled VIN.
Power Supply
The DP32 is designed to be powered either via USB or from an external power supply. Only one
supply should be selected at a time.
The DP32 has a single voltage regulator which regulates either 5V from USB to 3.3V, or a maximum
of 15V external voltage to 3.3V. The 3.3V regulator is a Microchip MCP1703. This regulator is rated
for a maximum output current of 250mA. The absolute maximum input voltage for the MCP1703 is
16V. This regulator has internal short circuit protection and thermal protection. It will get noticeably
warm when the current consumed by the VCC3V3 bus is close to the 250mA maximum.
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page 5 of 9
Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.
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