Digilent chipKIT Uno32 Довідковий посібник - Сторінка 11

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chipKIT Uno32 Reference Manual

serial converter. The USB serial converter

brings the DTR pin low to reset the

microcontroller. Jumper JP1 can be used to

enable/disable the ability for the USB serial

converter to initiate a reset.

The P32_RST net is connected to pin 1 of

connector J2. 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.

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, notably, the Ethernet

shield, connect pin 5 to the reset net on pin 1

of connector J2. This causes the processor to

be reset each time an attempt is made to

access the SPI port. Jumper JP9 can be used

to break the connection between J8 pin 5 and

reset when using Arduino shields that make

this connection. JP9 has a cut-able trace on

the bottom of the board that can be cut to

break the connection between SPI SS and

reset. JP9 is not loaded at the factory. To

restore the connection, solder a two pin header

at the JP9 position and install a shorting block.

A reset button is at the upper left corner of the

board. Pressing this button resets the PIC32

microcontroller.

Microchip Development Tool

Compatibility

In addition to being used with the MPIDE, the

Uno32 board can be used as a more traditional

microcontroller development board using

Microchip Development Tools.

www.digilentinc.com

Unloaded connector JP3 on the left side of the

board is used to connect to a Microchip

development tool, such as the PICkit3™. The

holes for JP3 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 PIC32 microcontroller family, and can be

connected via the same 6-pin interface as the

PICkit3, can be used.

Typically, a right-angle male connector is used

in JP3 so that a PICkit3 can be attached

coplanar with the Uno32 board. If the

connector is loaded from the top, the PICkit3

will be upright (button and LEDs visible).

Alternatively, the connector can be loaded from

the bottom. In this case, the PICkit3 will be

upside down.

If JP3 is loaded from the top, the PICkit3 will

interfere with the USB connector and the

external power connector. A short six-wire

cable can be used between the PICkit3 and

the Uno32. If JP3 is loaded from the bottom,

the PICkit3 won't interfere with the USB and

external power connectors.

The Digilent PICkit3 Programming Cable Kit

includes all necessary connectors and a cable

for connecting a PICkit3 to the Uno32.

The Microchip MPLAB

IDE can be used to program and debug code

running on the Uno32 board. These programs

can be downloaded from the Microchip web

site.

Using the Microchip development tools to

program the Uno32 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 boot

loader source code and compiled image can

be found in the MPIDE software download.

IDE or the MPLAB

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