Microchip Technology PIC-BLE Manuale di installazione

PIC-BLE

PIC-BLE Hardware User Guide

Preface

The PIC-BLE Development Board is a small and easily expandable demonstration and development platform for

Bluetooth® Low Energy (BLE) solutions based on the PIC® microcontroller architecture. It is designed to demonstrate

that the design of a typical BLE application can be simplified by partitioning the task into three blocks:

• Smart – represented by the PIC16LF18456 microcontroller

• Secure – represented by the ATECC608A secure element

• Connected – represented by the RN4870 BLE module

Also, the PIC-BLE Development Board features the following elements:

• The on-board debugger (PKoB nano) supplies full programming and debugging support through Microchip

MPLAB® X IDE. It also provides access to a serial port interface (serial to USB bridge) and one logic analyzer

channel (debug GPIO).

• A mikroBUS™ socket enables the ability to expand the board capabilities with the selection from 450+ sensors

and actuators options offered by MikroElektronika (www.mikroe.com) via a growing portfolio of Click board™.

Table of Contents

Preface........................................................................................................................................................... 1

1. Introduction............................................................................................................................................. 3

1.1. Features....................................................................................................................................... 3

1.2. Board Overview............................................................................................................................3

2. Getting Started........................................................................................................................................ 6

2.1. Quick Start....................................................................................................................................6

2.2. Design Documentation and Relevant Links................................................................................. 7

3. Hardware User Guide............................................................................................................................. 8

3.1. On-Board Debugger Overview..................................................................................................... 8

3.2. Power Supply............................................................................................................................. 14

3.3. Low-Power Operation.................................................................................................................14

3.4. Target Current Measurement..................................................................................................... 15

3.5. Peripherals................................................................................................................................. 15

4. Hardware Revision History and Known Issues..................................................................................... 22

4.1. Identifying Product ID and Revision........................................................................................... 22

4.2. Revision 4...................................................................................................................................22

4.3. Revision 3...................................................................................................................................22

5. Document Revision History...................................................................................................................23

6. Appendix............................................................................................................................................... 24

6.1. Schematics.................................................................................................................................24

6.2. Assembly Drawing......................................................................................................................27

The Microchip Website.................................................................................................................................28

Product Change Notification Service............................................................................................................28

Customer Support........................................................................................................................................ 28

Microchip Devices Code Protection Feature................................................................................................ 28

Legal Notice................................................................................................................................................. 29

Trademarks.................................................................................................................................................. 29

Quality Management System....................................................................................................................... 30

Worldwide Sales and Service.......................................................................................................................31

PIC-BLE

1. Introduction

1.1 Features

• PIC16LF18456 Microcontroller

• Two User LEDs (Data and Error)

• Mechanical Button

• RN4870 Bluetooth Low Energy (BLE) Module

• MCP9844 Temperature Sensor

• BMA253 Acceleration Sensor

• ATECC608A CryptoAuthentication™ Device

• SST25PF040CT 4 Mb Serial Flash

• mikroBUS Socket

• On-board Debugger

– Board identification in Microchip MPLAB® X IDE

– Programming and debugging

– Virtual serial port (USB CDC)

– One logic analyzer channel (DGI GPIO)

• USB or Battery Powered

1.2 Board Overview

The PIC-BLE development board is a hardware platform that is being used to evaluate the PIC16LF18456

microcontroller and RN4870 BLE module.

Figure 1-1. PIC-BLE Development Board Front Side

Micro-USB

Connector

Debugger

Power/Status

LED

ATECC6080A

Crypto

Data LED

(Green)

Error LED

(Red)

SST25PF040CT

Serial Flash

USB/Battery

MUX

BLE LED

(Blue)

MCP9844

Temp-sensor

BMA253

Accelerometer

PIC16LF18456

MCU

User Switch

(SW0)

RN4870

BLE module

PIC-BLE

Introduction

Figure 1-2. PIC-BLE Development Board Back Side

CR2032 Battery Holder

Additional RN4870 GPIO

PIC-BLE

Introduction

Figure 1-3. PIC-BLE Quick Reference Overview

PIC-BLE Development Board (DT100112)

MIC33050 DC/DC Converter

BMA253 Acceleration Sensor

ATECC608A Secure Element

RA4

RA1

RB3

RB0

RB1

RB2

5.0V

GND

SST25PF040C 4MB FLASH

RA5

Micro USB Connector

PKoB Nano Debugger/ Programmer

MCP9844 Temperature Sensor

RST

SPI CS

SPI SCK

SPI MISO

SPI MOSI

3.3V

GND

PIC16LF18456 MCU

User Switch 0

RN4870 Bluetooth Low Energy Module

RA2

RA3

RC0

RC1

RC2

RC3

RA7

PWM

INT

UART RX

UART TX

I2C SCL

I2C SDA

DATA LED

RN4870 P2_2

RN4870 P1_1 BLE STATUS LED

ERROR LED

CDC RX

CDC TX

DEBUG GPIO0

RB4 | EUSART1 TX

RB5 | EUSART1 RX

RA7

I2C SCL

I2C SDA

RB1

RB2

BLE MODE

BLE RST

BLE RX

RA7

RA0

RC4 | EUSART2 TX

BLE TX RC5 | EUSART2 RX SPI FLASH CS

SPI SCK

SPI MISO

RC7

RC1

RC2

SPI MOSIRC3

I2C SCL

I2C SDA

BMA 253 INT1

RB1

RB2

RA6

I2C SCL

I2C SDA

RB1

RB2

GREEN

BLUE

RED

PIC-BLE

Introduction

2. Getting Started

2.1 Quick Start

Demo Application

Out of the box, the PIC-BLE board comes programmed with the pic-lightblue-explorer-demo. This application can be

used to demonstrate a number of the board features using the LightBlue® app by Punch Through.

1. Download the latest demo firmware from the releases section on the pic-lightblue-explorer-demo GitHub page.

2. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the PC and the debug USB port on the

board.

3. Program the PIC-BLE with the downloaded .hex file through the drag-and-drop feature.

4. Download the LightBlue® app for iOS or Android.

5. Power the board through a Micro-USB cable or CR2032 battery.

6. Open the LightBlue® app and select the PIC-BLE peripheral.

7. Use the custom interface to explore the board.

Info: The PIC-BLE will show up in the LightBlue® app as PIC-BLE_xxxx, where xxxx are the last two

bytes of the RN4870 BLE module’s Bluetooth MAC address. This makes it possible to distinguish between

multiple PIC-BLE boards.

Communication between the demo application and the LightBlue® app is done by using a protocol based on ASCII

packets. Refer to the protocol section on the pic-lightblue-explorer-demo page for a list of commands with examples,

as well as the full source code for the project.

Development Requirements

MPLAB® X IDE:

•MPLAB X IDE v5.30 or later

•XC8 Compiler v2.10 or later

For help with installation, view the MPLAB X installation guide.

Build an Application

View the default source code that is pre-loaded onto the development board. Explore, modify, and build off this

source code to create a custom application.

1. View the source code at the pic-lightblue-explorer-demo GitHub page.

2. Read through the README.md to get more information on how to expand the solution.

3. Download the project from GitHub and open it in the latest version of MPLAB® X IDE.

4. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the Windows®, Mac®, or Linux® device

and the debug USB port on the PIC-BLE. The board will be identified in the kit window in MPLAB® X IDE.

5. Explore, modify, and build off the source code.

6. Make and program the device. Select the PKoB nano serial number as the debug tool when prompted.

Driver Installation

When the board connects to your computer for the first time, the operating system will perform a driver software

installation. The driver file supports both 32- and 64-bit versions of Microsoft® Windows® XP, Windows Vista®,

Windows® 7, Windows® 8, and Windows® 10. The drivers for the board are included with MPLAB® X IDE.

Kit Window

Once the board is powered, the green status LED will lit, and MPLAB® X IDE will auto-detect which boards are

connected. The Kit Window in MPLAB® X IDE will present relevant information like data sheets and board

documentation. The PIC16LF18456 device on the PIC-BLE board is programmed and debugged by the on-board

debugger, and, therefore, no external programmer or debugger tool is required.

PIC-BLE

Getting Started

Tip: If closed, the Kit Window in MPLAB® X IDE can be reopened through the menu bar Window > Kit

Window.

2.2 Design Documentation and Relevant Links

The following list contains links to the most relevant documents and software for the PIC-BLE board:

•MPLAB® X IDE - MPLAB X IDE is a software program that runs on a PC (Windows®, Mac OS®, Linux®) to

develop applications for Microchip microcontrollers and digital signal controllers. It is named an Integrated

Development Environment (IDE) because it provides a single integrated “environment” to develop code for

embedded microcontrollers.

•MPLAB® XC Compilers - MPLAB® XC8 C Compiler is available as a free, unrestricted-use download.

Microchips MPLAB® XC8 C Compiler is a comprehensive solution for your project’s software development on

Windows®, macOS® or Linux®. MPLAB® XC8 supports all 8-bit PIC® and AVR® microcontrollers (MCUs).

•MPLAB® Xpress Cloud-based IDE - MPLAB Xpress Cloud-Based IDE is an online development environment

that contains the most popular features of our award-winning MPLAB X IDE. This simplified and distilled

application is a faithful reproduction of our desktop-based program, which allows users to easily transition

between the two environments.

•MPLAB® Code Configurator - MPLAB Code Configurator (MCC) is a free software plug-in that provides a

graphical interface to configure peripherals and functions specific to your application.

•Microchip Sample Store - Microchip sample store where you can order samples of devices.

•MPLAB Data Visualizer - MPLAB Data Visualizer is a program used for processing and visualizing data. The

Data Visualizer can receive data from various sources such as serial ports and on-board debugger’s Data

Gateway Interface, as found on Curiosity Nano and Xplained Pro boards.

•Microchip PIC® and AVR® Examples - Microchip PIC and AVR Device Examples is a collection of examples

and labs that use Microchip development boards to showcase the use of PIC and AVR device peripherals.

•Microchip PIC® and AVR® Solutions - Microchip PIC and AVR Device Solutions contains complete

applications for use with Microchip development boards, ready to be adapted and extended.

•PIC-BLE website - Kit information, latest user guide and design documentation.

•PIC-BLE on Microchip Direct - Purchase this kit on Microchip Direct.

PIC-BLE

Getting Started

3. Hardware User Guide

3.1 On-Board Debugger Overview

PIC-BLE contains an on-board debugger for programming and debugging. The on-board debugger is a composite

USB device consisting of several interfaces:

• A debugger that can program and debug the PIC16LF18456 in MPLAB® X IDE

• A mass storage device that allows drag-and-drop programming of the PIC16LF18456

• A virtual serial port (CDC) that is connected to a Universal Asynchronous Receiver/Transmitter (UART) on the

PIC16LF18456, and provides an easy way to communicate with the target application through terminal software

• A Data Gateway Interface (DGI) for code instrumentation with logic analyzer channels (debug GPIO) to visualize

program flow

The on-board debugger controls a Power and Status LED (marked PS) on the PIC-BLE board. The table below

shows how the LED is controlled in different operation modes.

Table 3-1. On-Board Debugger LED Control

Operation Mode Power and Status LED

Boot Loader mode The LED blinks slowly during power-up

Power-up The LED is ON

Normal operation The LED is ON

Programming Activity indicator: The LED blinks slowly during programming/debugging

Drag-and-drop

programming Success: The LED blinks slowly for 2 sec.

Failure: The LED blinks rapidly for 2 sec.

Fault The LED blinks rapidly if a power fault is detected

Sleep/Off The LED is OFF. The on-board debugger is either in a sleep mode or powered down.

This can occur if the board is externally powered.

Info: Slow blinking is approximately 1 Hz, and rapid blinking is approximately 5 Hz.

3.1.1 Debugger

The on-board debugger on the PIC-BLE board appears as a Human Interface Device (HID) on the host computer’s

USB subsystem. The debugger supports full-featured programming and debugging of the PIC16LF18456 using

MPLAB® X IDE.

Remember: Keep the debugger’s firmware up-to-date. Firmware upgrades automatically when using

MPLAB® X IDE.

3.1.2 Virtual Serial Port (CDC)

The virtual serial port (CDC) is a general purpose serial bridge between a host PC and a target device.

PIC-BLE

Hardware User Guide

3.1.2.1 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 serial port. The CDC can be used to stream arbitrary data in

both directions between the host computer and the target: All characters sent through the virtual serial port on the

host computer will be transmitted as UART on the debugger’s CDC TX pin, and UART characters captured on the

debugger’s CDC RX pin will be returned to the host computer through the virtual serial port.

Figure 3-1. CDC Connection

Target MCU

UART TX

UART RX

Debugger

USB

CDC RX

CDC TX

Terminal

Software

Target

Receive

Target

Send

Terminal

Receive

Terminal

Send

Info: As shown in Figure 3-1, the debugger’s CDC TX pin is connected to a UART RX pin on the target

for receiving characters from the host computer. Similarly, the debugger’s CDC RX pin is connected to a

UART TX pin on the target for transmitting characters to the host computer.

3.1.2.2 Operating System Support

On Windows® machines, the CDC will enumerate as Curiosity Virtual COM Port and appear in the Ports section of

the Windows Device Manager. The COM port number can also be found there.

Info: On older Windows systems, the CDC requires a USB. This driver is included in installations of

MPLAB® X IDE.

On Linux® machines, the CDC will enumerate and appear as /dev/ttyACM#.

Info: tty* devices belong to the “dialout” group in Linux, so it may be necessary to become a member of

that group to have permissions to access the CDC.

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#.

Info: For all operating systems: Be sure to use a terminal emulator that supports DTR signaling. See

3.1.2.4 Signaling.

3.1.2.3 Limitations

Not all UART features are implemented in the on-board debugger CDC. The constraints are outlined here:

•Baud rate: Must be in the range of 1200 bps to 500 kbps. Any baud rate outside this range will be set to the

closest limit, without warning. Baud rate can be changed on-the-fly.

•Character format: Only 8-bit characters are supported.

PIC-BLE

Hardware User Guide

•Parity: Can be odd, even, or none.

•Hardware flow control: Not supported.

•Stop bits: One or two bits are supported.

3.1.2.4 Signaling

During USB enumeration, the host OS will start both communication and data pipes of the CDC interface. At this

point, it is possible to set and read back the baud rate and other UART parameters of the CDC, but data sending and

receiving will not be enabled.

When a terminal connects to the host, it must assert the DTR signal. As this is a virtual control signal implemented on

the USB interface, it is not physically present on the board. Asserting the DTR signal from the host will indicate to the

on-board debugger that a CDC session is active. The debugger will then enable its level shifters (if available) and

start the CDC data send and receive mechanisms.

Deasserting DTR in debugger firmware version 1.20 or earlier has the following behavior:

• Debugger UART receiver is disabled, and no further data will be transferred to the host computer

• Debugger UART transmitter will continue to send data that is queued for sending, but no new data is accepted

from the host computer

• Level shifters (if available) are not disabled, and the debugger CDC TX line remains driven

Deasserting DTR in debugger firmware version 1.21 or later has the following behavior:

• Debugger UART receiver is disabled, so no further data will be transferred to the host computer

• Debugger UART transmitter will continue to send data that is queued for sending, but no new data is accepted

from the host computer

• Once the ongoing transmission is complete, level shifters (if available) are disabled, so the debugger CDC TX

line will become high-impedance

Remember: Set up the terminal emulator to assert the DTR signal. Without the signal, the on-board

debugger will not send or receive any data through its UART.

Tip: The on-board debugger’s CDC TX pin will not be driven until the CDC interface is enabled by the

host computer. Also, there are no external pull-up resistors on the CDC lines connecting the debugger and

the target, which means that during power-up, these lines are floating. To avoid any glitches resulting in

unpredictable behavior like framing errors, the target device may enable the internal pull-up resistor on the

pin connected to the debugger’s CDC TX pin.

3.1.2.5 Advanced Use

CDC Override Mode

In normal operation, the on-board debugger is a true UART bridge between the host and the device. However, in

certain use cases, the on-board debugger can override the basic operating mode and use the CDC TX and RX pins

for other purposes.

Dropping a text file into the on-board debugger’s mass storage drive can be used to send characters out of the

debugger’s CDC TX pin. The filename and extension are trivial, but the text file must start with the characters:

CMD:SEND_UART=

Debugger firmware version 1.20 or earlier has the following limitations:

• The maximum message length is 50 characters – all remaining data in the frame are ignored

• The default baud rate used in this mode is 9600 bps, but if the CDC is already active or has been configured,

the previously used baud rate still applies

Debugger firmware version 1.21 and later has the following limitations/features:

PIC-BLE

Hardware User Guide

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