Curiosity Nano; On-Board Debugger - Microchip Technology PIC16F15376 Curiosity Nano Hardware User's Manual

3.

Curiosity Nano

Curiosity Nano is an evaluation platform of small boards with access to most of the microcontrollers I/Os. The
platform consists of a series of low pin count microcontroller (MCU) boards with on-board debuggers, which are
integrated with Microchip MPLAB
data sheets, and example code are easy to find. The on-board debugger features a Virtual COM port (CDC) for serial
communication to a host PC, and a Data Gateway Interface (DGI) GPIO logic analyzer pin.
3.1

On-board Debugger

The PIC16F15376 Curiosity Nano contains an on-board debugger for programming and debugging. The on-board
debugger is a composite USB device of several interfaces: A debugger, a mass storage device, a data gateway, and
a Virtual COM port (CDC).
Together with Microchip MPLAB
A Data Gateway Interface (DGI) is available for use with the logic analyzer channels for code instrumentation, to
visualize the program flow. DGI GPIOs can be graphed using the
The Virtual COM port is connected to a UART on the PIC16F15376 and provides an easy way to communicate with
the target application through terminal software.
The on-board debugger controls a Power and Status LED (marked PS) on the PIC16F15376 Curiosity Nano. The
table below shows how the LED is controlled in different operation modes.
Table 3-1. On-Board Debugger LED Control
Operation Mode
Boot Loader mode
Power-up
Normal operation
Programming
Fault
Sleep/Off
3.1.1 Virtual COM Port
The Virtual COM port is a general purpose serial bridge between a host PC and a target device.
3.1.1.1 Overview
The on-board debugger implements a composite USB device that includes a standard Communications Device Class
(CDC) interface, which appears on the host as a Virtual COM port. The CDC can be used to stream arbitrary data in
both directions between the host and the target: All characters sent from the host will be sent through a UART on the
CDC TX pin, and UART characters sent into the CDC RX pin will be sent back to the host through the Virtual COM
Port.
On Windows machines, the CDC will enumerate as Curiosity Virtual COM Port and appear in the Ports section of the
device manager. The COM port number is shown here.
On Linux machines, the CDC will enumerate and appear as /dev/ttyACM#.
On MAC machines, the CDC will enumerate and appear as /dev/tty.usbmodem#. Depending on which terminal
program is used, it will appear in the available list of modems as usbmodem#.
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®
X. Each board is identified in the IDE, and relevant user guides, application notes,
®
X, the on-board debugger can program and debug the PIC16F15376.
LED blink at 1 Hz during power-up.
LED is ON.
LED is ON.
Activity indicator: The LED flashes slowly during programming/debugging.
The LED flashes fast if a power fault is detected.
LED is off. The on-board debugger is either in Sleep mode or powered down. This
can occur if the kit is externally powered.
User Guide
PIC16F15376 Curiosity Nano
Data Visualizer.
Status LED
Curiosity Nano
50002900B-page 6