Texas Instruments BoosterPack BOOST-IR User manual

User's Guide

SLAU598A–December 2014–Revised July 2015

BOOST-IR Infrared (IR) BoosterPack™ Plug-in Module

The BOOST-IR BoosterPack™ Plug-in Module can be plugged into a LaunchPad™ Development Kit for

simple integration of infrared (IR) transceiver functionality. LaunchPad developers can use this

BoosterPack to start developing remote control applications using the on-board keypad, IR LED

transmitter, and IR receiver + demodulator.

Infrared modulation can be simplified by using on-chip IR Modulation Logic, which can be found on select

MSP430 ultra-low-power microcontrollers within the MSP430FRxx MCU series.

Explore IR communication using the MSP430FR4xx and MSP430FR2xx microcontrollers

TI Designs are also available to help accelerate development using IR transceiver capabilities. These

designs contain documentation, design files, and test data to minimize design overhead.

Download a full reference design leveraging the MSP-EXP430FR4133 LaunchPad and BOOST-IR

BoosterPack

Figure 1. BOOST-IR BoosterPack

BoosterPack, LaunchPad, MSP430, Code Composer Studio, E2E are trademarks of Texas Instruments.

All other trademarks are the property of their respective owners.

SLAU598A–December 2014–Revised July 2015 BOOST-IR Infrared (IR) BoosterPack™ Plug-in Module

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Contents

1 Getting Started............................................................................................................... 3

2 Hardware...................................................................................................................... 4

3 TI Design and Software Examples....................................................................................... 10

4 Additional Resources ...................................................................................................... 22

5 FAQs......................................................................................................................... 23

6 Schematics.................................................................................................................. 24

List of Figures

1 BOOST-IR BoosterPack .................................................................................................... 1

2 BOOST-IR Overview ........................................................................................................ 4

3 BoosterPack Pinout.......................................................................................................... 5

4 Membrane Keypad Connections........................................................................................... 6

5 IR Transmit Circuit........................................................................................................... 7

6 IR Receive Circuit............................................................................................................ 8

7 Pulse Position Encoding (ASK)........................................................................................... 11

8 IR Modulation Logic Blocks in MSP430FR4133 ....................................................................... 12

9 ASK IR Generation on MSP430FR4133 ................................................................................ 13

10 IR Demodulation............................................................................................................ 13

11 Pulse Distance Encoding.................................................................................................. 14

12 Pulse Distance Protocol, Data Frame Format.......................................................................... 14

13 MSP430FR4133 Pinout ................................................................................................... 16

14 Directing the Project>Import Function to the Demo Project .......................................................... 17

15 When CCS Has Found the Project ...................................................................................... 18

16 BOOST-IR Software Examples in TI Resource Explorer ............................................................. 22

17 Schematics.................................................................................................................. 24

List of Tables

1 IR Receiver Replacement Options ........................................................................................ 8

2 Hardware Change Log...................................................................................................... 9

3 Software Examples ........................................................................................................ 17

4 IDE Minimum Requirements for MSP430FR4133 ..................................................................... 17

5 Source Files and Folders.................................................................................................. 19

6 Source Files and Folders.................................................................................................. 20

7 Current Consumption...................................................................................................... 21

8 Range Testing .............................................................................................................. 21

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Getting Started

1 Getting Started

1.1 Introduction

The BOOST-IR BoosterPack™ Plug-in Module can be plugged into a LaunchPad™ Development Kit for

simple integration of infrared (IR) transceiver functionality. LaunchPad developers can use this

BoosterPack to start developing remote control applications using the on-board keypad, IR LED

transmitter, and IR receiver + demodulator.

Infrared modulation can be simplified by using on-chip IR Modulation Logic, which can be found on select

MSP430 ultra-low-power microcontrollers within the MSP430FRxx MCU series.

Explore IR communication using the MSP430FR4xx and MSP430FR2xx microcontrollers

TI Designs are also available to help accelerate development using IR transceiver capabilities. These

designs contain documentation, design files, and test data to minimize design overhead.

Download a full reference design leveraging the MSP-EXP430FR4133 LaunchPad and BOOST-IR

BoosterPack

1.2 Key Features

• IR LED transmitter

• IR receiver and demodulator

• 4x4 membrane keypad

• 20-pin BoosterPack standard for use with any LaunchPad

• Compatibility with different IR signal-generation methods

1.3 What’s Included

1.3.1 Kit Contents

• 1 x BOOST-IR BoosterPack Plug-in module

• 1 x Quick Start Guide

1.3.2 Software Examples

• MSP-EXP430FR4133 LaunchPad and BOOST-IR demos (see Section 3)

– IR Emitter and Receiver

– IR Learning Mode

1.4 Next Steps: Looking Into the Provided Code

After the EVM features have been explored, the fun can begin. It’s time to open an integrated

development environment (IDE) and start looking at the code examples. Section 3 describes the example

projects available to make it easy to understand the provided software.

SLAU598A–December 2014–Revised July 2015 BOOST-IR Infrared (IR) BoosterPack™ Plug-in Module

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2 Hardware

Figure 2 shows an overview of the BOOST-IR module.

Figure 2. BOOST-IR Overview

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Hardware

2.1 Hardware Features

2.1.1 BoosterPack Pinout

Figure 3. BoosterPack Pinout

The IR BoosterPack adheres to the 20-pin LaunchPad and BoosterPack pinout standard (see Figure 3).

This standard was created to aid compatibility between LaunchPad and BoosterPack tools across the TI

ecosystem.

The 20-pin standard is compatible with the 40-pin standard that is used by other LaunchPad kits like the

MSP-EXP430F5529LP. This allows for 20-pin BoosterPacks to be used with 40-pin LaunchPads.

The BOOST-IR intentionally does not use the I2C and SPI pins to allow other BoosterPacks that use these

pins to be stacked together with the IR BoosterPack. This BoosterPack does not have both male and

female headers to support stacking on top. This is because the keypad is too large, and in most

applications this keypad would be on the top. To stack other BoosterPacks along with BOOST-IR, use

them lower in the "stack" with BOOST-IR on top.

More information about compatibility can also be found at http://www.ti.com/launchpad.

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2.1.2 Membrane Keypad

Figure 4. Membrane Keypad Connections

The membrane keypad is a 4x4 matrix keypad, controlled by 4 Keypad Out pins (columns), and 4 Keypad

In pins (rows). Without any buttons pressed, the columns and rows are not connected to each other.

When a button is pressed, it connects its corresponding column pin with its corresponding row pin.

To detect any key presses, the connection of the row pin to the column pin must be detected. This is

accomplished by configuring the Keypad Out pins as outputs, and Keypad In pins as inputs. The Keypad

Out pins are toggled high one at a time, while the Keypad In pins are read for any changes. This allows

the exact key to be determined in the 4x4 matrix.

As an example, refer to the Figure 4 keypad layout. If the bottom left button is pressed, the Keypad Out 4

pin is now connected to the Keypad In 1 pin. The host MCU starts reading the keypad matrix by toggling

Keypad Out 1 high (while keeping all other Keypad Out pins low), and reads all Keypad In pins low. This

is because Keypad Out 1 is still not connected to any Keypad In pins by a button press. The host MCU

then toggles Keypad Out 2 high, and reads all Keypad In pins still low. Eventually, the MCU toggles

Keypad Out 4 high, and reads that Keypad In 1 has now transitioned to high. Recall that the bottom left

button connects Keypad Out 4 with Keypad In 1, forcing the input row to read high. The MCU maps out

this connection and knows that the bottom left button was pushed, because that is the intersection point of

Keypad Out 4 and Keypad In 1. The MCU can now perform the action that corresponds to the key press.

It may seem like a key press can be missed with this procedure, but it is happening many times per

second, allowing for any key press to be detected. It is possible for keys to go undetected due to key

"ghosting" in a matrix keypad, but that is outside the scope of this brief overview. This only occurs when

multiple buttons are pressed at the same time, and there are ghost key detection algorithms to prevent

any misinterpretations.

NOTE: The Keypad Out 2 (J1.3) pin is connected to the UART receive pin on the BoosterPack

standard. On most 20-pin LaunchPads (MSP-EXP430G2, MSP-EXP430FR5969, MSP-

EXP430FR4133), the Keypad Out 2 pin is also connected to the LaunchPad backchannel

UART pin. For proper operation of the Keypad, disconnect the UART RX jumper on the

LaunchPad isolation block.

6BOOST-IR Infrared (IR) BoosterPack™ Plug-in Module SLAU598A–December 2014–Revised July 2015

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Hardware

2.1.3 IR Transmit

Figure 5 shows the schematic of the IR transmit circuit.

Figure 5. IR Transmit Circuit

2.1.3.1 IR Transmit Overview

To transmit an IR signal, an infrared (IR) LED is toggled to blink the LED. Using IR protocols, messages

can be read such as commands from remote controls. More information on IR protocol can be found in

Infrared Remote Control Implementation With MSP430FR4xx (SLAA644) and also in Section 3.1.1.

Because the IR LED requires high currents to transmit longer distances, this LED is not controlled directly

with a general purpose IO pin from the MCU. Instead a switching circuit that allows current to flow directly

from the main power source is used. See Section 2.2 for more information on power and Section 6 for the

schematics.

2.1.3.2 Setting IR Transmit Power

To set the current of the IR LED, resistor R2 (47 Ω) is used. This resistor can be adjusted to change the

IR LED transmit power. Decreasing R2 increases the power through the IR LED, which increases the

range of the remote.

NOTE: Increasing the IR transmit power may draw more current than supported from the

LaunchPad. Check the specific LaunchPad user’s guide to make sure that enough power

can be provided, or use external power (see Section 2.2.2).

2.1.3.3 IR Transmit Selection

IR transmit can be controlled by two different pins, selectable by jumper J4 (see Figure 2).

Setting the J4 jumper to the left side selects the hardware IR module (J1.4), which is only featured on

some LaunchPads, such as the MSP-EXP430FR4133. The hardware IR module simplifies the software

needed for IR transmission, because the hardware handles the protocol.

NOTE: When using the hardware IR module (J1.4), this pin is connected to the UART transmit pin

on the BoosterPack standard. On some LaunchPads, such as the MSP-EXP430FR4133, the

hardware IR module pin is also connected to the LaunchPad backchannel UART pin. For

proper operation of the hardware IR module, it is recommended to disconnect the UART TX

jumper on the LaunchPad isolation block.

SLAU598A–December 2014–Revised July 2015 BOOST-IR Infrared (IR) BoosterPack™ Plug-in Module

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Setting jumper J4 to the right selects PWM control (J2.19), which can be used on any LaunchPad. The

PWM method requires additional software to control the PWM pin according to the IR protocol.

2.1.4 IR Receive

Figure 6 shows the schematic of the IR receive circuit.

Figure 6. IR Receive Circuit

The IR receive module receives and demodulates the incoming signal. The default IR receiver supports IR

transmission at 38 kHz. This is the most commonly used IR frequency for use in remote controls. If

another frequency is needed, the IR receive module can be replaced with a drop-in replacement that

supports another frequency (see Table 1). More information on IR protocol can be found in Infrared

Remote Control Implementation With MSP430FR4xx (SLAA644) and also in Section 3.1.1.2.

Table 1. IR Receiver Replacement Options

Part Number Receive Frequency

TSOP58430 30 kHz

TSOP58433 33 kHz

TSOP58436 36 kHz

TSOP58438 38 kHz (Populated)

TSOP58440 40 kHz

TSOP58456 56 kHz

The IR receive module is very sensitive and receives almost all of the IR transmissions from its own IR

LED. This is mostly unavoidable without physically altering the BoosterPack. Make sure that your firmware

compensates for receiving its own transmissions by ignoring them or verifying that the proper output was

sent.

2.2 Power

The board was designed to be powered either by the attached LaunchPad or by an external source

through the external power connector.

2.2.1 LaunchPad Power

This is the default power configuration for the BOOST-IR. In this configuration, power is provided through

the 3V3 (J1.1) pin on the BoosterPack headers. The 3V3 pin powers everything on the IR BoosterPack,

including IR transmit and receive.

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Hardware

2.2.2 External Power

There are a few reasons why you may want to provide external power, including higher IR transmit power,

changing to a different voltage, or using a battery to go "wireless." To provide external power, use the

following procedure.

1. Disconnect BOOST-IR power from the LaunchPad power source

(a) Option 1: Remove the 3V3 jumper on the LaunchPad isolation block

In this case, the MCU is also powered by the external source; make sure that the voltage is within

the MCU device voltage operation specification.

(b) Option 2: Remove R1 on the BOOST-IR to completely disconnect LaunchPad and BoosterPack

power

(i) In this case, the LaunchPad must provide power to its own MCU.

(ii) If the LaunchPad and BoosterPack have different operating voltages, IR communication may

not function properly.

2. Connect the external power supply.

After these steps are complete, you should be able to operate the IR BoosterPack with an external

voltage.

2.3 Design Files

2.3.1 Hardware

Schematics can be found in Section 6. All design files including schematics, layout, bill of materials

(BOM), Gerber files, and documentation are available in a zip folder (SLAR104).

2.3.2 Software

All design files including TI-TXT object-code firmware images, software example projects, and

documentation are available in the LaunchPad specific software folders. To see which LaunchPads

feature BOOST-IR examples, refer to the "What’s Included" section on the BOOST-IR tool folder.

2.3.3 Quick Start Guide

The BOOST-IR Quick Start Guide is SLAU614.

2.4 Hardware Change Log

Table 2. Hardware Change Log

PCB Revision Description

Rev 1.0 Initial Release

SLAU598A–December 2014–Revised July 2015 BOOST-IR Infrared (IR) BoosterPack™ Plug-in Module

TI Design and Software Examples

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3 TI Design and Software Examples

3.1 TI Design: BOOST-IR + MSP-EXP430FR4133 IR Remote Control

TI Designs Design Features

TI Designs provide the foundation that you need • Implements ASK IR modulation

including methodology, testing, and design files • 38-kHz onboard demodulator

to quickly evaluate and customize the system. TI • 4x4 membrane keypad

Designs help you accelerate your time to market. • Jumper to configure IR generation method -

System Description support for most LaunchPad kits

The BOOST-IR BoosterPack is an easy-to-use • IR Emitter and Receiver examples

plug-in module for adding Infrared (IR) • IR Learning Mode example

communications to your Launchpad design. It Featured Applications

contains everything that you need to start

developing IR communication with your • TV Remote Control

Launchpad, including a keypad, IR LED • Air Conditioner Remote Control

transmitter, and IR receiver + demodulator. Design Photo

Design Resources

TIDM-BOOST-IR- Design Folder

REMOTE

MSP-EXP430FR4133 Product Folder

BOOST-IR Product Folder

MSP430FR4133 Product Folder

Find an answer:

MSP430 E2E Support Forum

Block Diagram

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