AVR16EB32 datasheet(18/46 Pages) MICROCHIP

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AVR16EB32 Curiosity Nano

On-Board Debugger

User Guide

DS50003605B - 18

Info: The on-board debugger dynamically updates STATUS.TXT. The contents

may not reflect the correct status as the OS may cache it.

3.5.2

Limitations of Drag-and-Drop Programming

Lock Bits

Lock bits included in the hex file will be ignored when using drag-and-drop programming. To

program lock bits, use MPLAB® X IDE.

Enabling CRC Check in Fuses

It is not advisable to enable the CRC check fuses in the target device when using drag-and-drop

programming because a subsequent chip erase (which does not affect fuse bits) will cause a CRC

mismatch, and the application will fail to boot. A chip erase must be done using MPLAB® X IDE, which

automatically clears the CRC fuses after erasing to recover a target from this state.

3.5.3

Special Commands

Several utility commands are supported by copying text files to the mass storage disk. The filename

or extension is irrelevant – the command handler reacts to content only.

Table 3-3. Special File Commands

Command Content

Description

CMD:ERASE

Executes a chip erase of the target

CMD:SEND_UART=

Sends a string of characters to the CDC UART. See “CDC Override

Mode.”

CMD:SEND_9600=

CMD:SEND_115200=

CMD:SEND_460800=

Sends a string of characters to the CDC UART at the specified baud

rate. Note that only the baud rates explicitly specified here are

supported. See “CDC Override Mode.” (Debugger firmware v1.25.6

or newer.)

CMD:RESET

Resets the target device by entering Programming mode and exiting

Programming mode immediately afterward. The exact timing can

vary according to the programming interface of the target device.

(Debugger firmware v1.25.6 or newer.)

Info: The content sent to the mass storage emulated disk triggers the commands

listed here and provides no feedback in the case of either success or failure.

3.6

Data Gateway Interface (DGI)

Data Gateway Interface (DGI) is a USB interface transporting raw and timestamped data between

on-board debuggers and host computer-based visualization tools. MPLAB Data Visualizer is used on

the host computer to display any debug GPIO data. It is available as a plug-in for MPLAB X IDE or a

stand-alone application that can be used in parallel withMPLAB® X IDE.

Although DGI encompasses several physical data interfaces, the AVR16EB32 Curiosity Nano

implementation includes logic analyzer channels:

• Two debug GPIO channels (also known as DGI GPIO)

3.6.1

Debug GPIO

Debug GPIO channels are timestamped digital signal lines connecting the target application to a

host computer visualization application. They are typically used to plot low-frequency events on a

time axis, such as when given Application state transitions occur.

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