EVBplus Alice EduPad Manuel utilisateur

Alice EduPad for TI MSP432P401R

LaunchPad

User’s Guide

Version 1.04 06/27/2018

Table OF Contents

Chapter 1. Overview ...................................................................................................................................3

1.1 Welcome .................................................................................................................................3

1.2 MSP432 LaunchPad features ..............................................................................................4

1.3 Alice EduPad hardware features ........................................................................................4

Chapter 2. Software development ..........................................................................................................5

Chapter 3. Online resources ....................................................................................................................7

Chapter 4. Hardware Descriptions .........................................................................................................8

4.1 LEDs ........................................................................................................................................8

4.2 Push button switches............................................................................................................8

4.3Light sensor ...........................................................................................................................8

4.4Potentiometer ........................................................................................................................8

4.5Temperature sensor..............................................................................................................8

4.6 Speaker....................................................................................................................................8

4.7 EEPROM..................................................................................................................................8

4.8 UART communication ..........................................................................................................8

4.97-Segment LED display.........................................................................................................9

4.10 LCD display ......................................................................................................................... 10

4.11 Digital-to-Analog Converter (DAC) .................................................................................. 10

4.12H-Bridge ............................................................................................................................... 11

4.13CAN ...................................................................................................................................... 11

4.14TFT ........................................................................................................................................ 11

4.15OLED .................................................................................................................................... 12

4.16 SD card ................................................................................................................................ 12

4.17ESP8266 .............................................................................................................................. 12

4.18All on-board I/O headers ................................................................................................... 13

4.19 I/O pin usage ....................................................................................................................... 14

Chapter 1. Overview

1.1 Welcome

Thank you very much for purchasing our Alice EduPad trainer for TI’s MSP432 LaunchPad. The

Alice EduPad trainer is a low-cost, feature-packed universal training board for the MSP432

LaunchPad. It incorporates onboard peripherals that will make this board an ideal trainer for EE

and ECE courses in universities around the world.

For engineers, it is a convenient prototype system suitable for designers who want to rapidly

develop and prototype ARM controller applications. For students, it not only can be used as a

general trainer for freshman and sophomore but also as a versatile platform for senior projects as

well. The features of the Alice EduPad trainer create a new potential for students at every level.

Please note that the MSP432 LaunchPad and USB cable are not included with your

purchase of the Alice EduPad trainer.

The micro USB cable comes with your LaunchPad purchase from TI on line store.

https://store.ti.com/msp-exp432p401r.aspx?jktype=companionparts

Theyusuallyhave it in stock. Other distributors, like Mouser and Digi-key, all have it, but the price

may be a little higher.

The external power supply is not needed for your normal use, it’s only needed when in

standalone operation without a PC. The DCjack uses a Micro USB connector. Most of smart

phone chargers except iPhone have a 5V output with a micro USB connector, they can be used

as external power supply.

Warning:

The MSP432 LaunchPad does not have a built-in reverse-polarity-protection diode. If you

are going to experience H-Bridge with an external high voltage motor (>5V), please make

sure that the high voltage (>5V) cannot be touched with the 5V supply, or it may damage

the USB port of your laptop, or even your whole laptop.

1.2 MSP432 LaunchPad features:

The TI MSP432 LaunchPad isa low cost evaluation platform for ARM Cortex-M4F

microcontrollers made by TI. It has many features, the main features of the TI MSP432

LaunchPadare listed below:

•Low-power, high performance MSP432P401R MCU

48MHz 32-bit ARM Cortex M4Fwith Floating Point Unit and DSP acceleration

Power consumption: 80uA/MHz active and 660nA RTC standby operation

Analog: 24Ch 14-bit differential 1MSPS SAR ADC, Two Comparators

Digital: Advanced Encryption (AES256)Accelerator, CRC, DMA, HW MPY32

Memory: 256KB Flash, 64KB RAM

Timers: 4 x16-bit, and 2 x 32-bit

Communication: Up to 4 I2C, 8 SPI, 4 UART

•40 pin BoosterPack Connector, and support for 20 pin BoosterPacks

•Onboard XDS-110ET emulator featuring EnergyTrace+ Technology

•2 buttons and 2 LEDs for User Interaction

•RGB LED

•Back-channel UART via USB to PC

1.3 Alice EduPad hardware features:

The Alice EduPad board includes the following featuresfor teaching ARM courses:

1. Four user LEDs

2. Four pushbutton switches

3. Four Servo controls or relay outputs

4. Speaker to be driven by timer, DAC or PWM signal for alarm or music applications.

5. 7-segment display

6. 16X2 LCDwith a jumper selectable for serial or 4-bit parallel interface

7. 0.96”, 128x64 OLED header

8. 2.2” TFT QVGA display header

9. ESP8266 for WiFi applications

10. Light sensor

11. Temperature sensor

12. Potentiometer for analog input

13. 12-bit DAC

14. Dual H-Bridge for controlling two DC motors or one stepper motor

15. Two analog sensor inputs

16. MicroSD memory card slot

17. Solderless breadboard included

18. PCboard size is 6.25" X 3.1”

Chapter 2. Software development

It is recommended that you become familiar with the software development tools for the MSP432

LaunchPad before working with the Alice EduPad.

So the software development on the Alice EduPad is a two-step process.

1, Work on the MSP432 LaunchPad standalone and familiarize with its software development. Don’t

plug the Launchpad onto the Alice EduPad until you feel comfortable in writing a small test program

because it’s easier to test a small program on the Launchpad alone.

2. Insert the MSP432 LaunchPad onto the Alice EduPad’s J14 and J19.

The MSP432 LaunchPad on the Alice EduPad

TI listed three major IDE’s for LaunchPad software development:

Keil MDK-ARM

IAR Embedded Workbench

Code Composer Studio

Since Keil was acquired by ARM, for an EE or an ECE course, the Keil seems to be more popular.

Professor Mazidi and Professor Chen have chosen the Keil IDE and wrote a textbook for the MSP432

LaunchPad. Professor Mazidi is a highly regarded author of many textbooks for embedded systems,

and Professor Chen is an ARM controller software expert who wrote and tested all C and Energia

sample programs for the Alice EduBase and the Alice EduPad. We are very grateful fortheir hard work.

You can purchase their books at Amazon.

https://www.amazon.com/MSP432-Programming-Embedded-Systems-

books/dp/0997925914/ref=sr_1_2?s=books&ie=UTF8&qid=1474025605&sr=1-

2&keywords=MSP432+ARM+Book+Mazidi+and+Naimi

Sample programs are available at Professor Mazidi’s web site:

http://www.MicroDigitalEd.com/ARM/MSP432_books.htm

Chapter 3. On-line resources

MSP432 LaunchPad user’s guide including schematic:

http://www.ti.com/lit/ug/slau597f/slau597f.pdf

How to download and install Keil and How to Create a C Project in Keil and sample programs:

http://www.MicroDigitalEd.com/ARM/TI_ARM_books.htm

This book can be used with Alice EduPad.

If you have any technical questions regarding the MSP432 LaunchPad, you can post a message at

the MSP432 forum. ManyTI engineers are active on the forum to answer yourquestions.

If you have any question regarding the Alice EduPad hardware and need a tech support call us at 1-

847 250-5160 or email your question to evbplus @ gmail.com

Chapter 4: Hardware Descriptions

The circuit is designed in such waythat the value of all resistorsand capacitors are not critical.

4.1 LEDs:

The P3.2, P3.3, P2.5, P2.4 are connected to the LED0-LED3 via a buffer (U8). In order to turn

on an LED, you need to program the corresponding pin as output and set it high.

4.2 Push button switches:

The P4.4, P4.2, P4.0, P6.1 are connected to the 4 push buttons, SW2-SW5.

4.3 Light sensor (AN0)

The light sensor (a TEMP4452 or equivalent) is connected to the PE1 (AIN2) of the ADC port.

4.4 Potentiometer (AN1)

The 5K potentiometer VR2 is connected to the PE2 (AIN1) of the ADC port

4.5 Temperature sensor (AN2)

The temperature sensor(LM45 orequivalent) is connected to the PE5 (AIN8) of the ADC port

4.6 Speaker

The speaker is a 5V audio magnetic transducer and it’s driven by the PC4, a timer, or by the

DAC output from U17 (MCP4725). The signal source of the speaker is selected by the jumper

J24.

4.7 Serial I2C EEPROM

A small serial EEPROM (24LC02) is provided for experimenting with I2C communication.

4.8 UART communication

When P3.2 and P3.3 are not used for the Lab assignment #1 (see above paragraph #4.1 and

#4.2) ornot used for driving the onboard H-Bridge, theycan be used asa UART.

The UART can be used by user’s application programs. It supports direct 3.3V digital signal

interface with other boards, or use a 3V USB serial adapter (a FTDI cable) for interfacing with a

PC.

4.9 7-Segment LED display

The type of the 7-segment LED display on the Alice EduPad is called common anode, all

cathodes are driven individually by an outputpin and the anode is connected to the 5V supply.

Before sending a number to a 7-segment LED display, the number must be converted to its

corresponding 7-segment code depending on how the 7-segment display is connected to an

output port.

Because there are not enough I/O pins available, the Alice EduPad incorporates an HCT595

shift register to drive the cathodes. When a cathode is low, the corresponding LED segment

lights up.

By convention, the 7segments are called segment A, B, C, D, E, F and G. Their locations in the

display are shown below:

The segment A, B, C, D, E, F, G and DecimalPointare driven byQA, QB, QC, QD, QE, QF,

QG, and QH, respectively. The hex value of the segment code is shown in the following table:

Number

Hex Value

0x06

0x5B

0x4F

0x66

The above table only lists #1 to #4, it’s not difficult to figure out the other numbers once

you know how #1 to #4 are created. To display the number 1 on the 7-segment display,

you normally send 0x06 to the HCT595. Since this has a common anode, you need to

invert the 0x06 before sending data out to the HCT595. You could invert the number and

send 0xF9 to the HCT595 or you could use the C operator and send ~0x06.

4.10 LCD display

4.10.1. Serial interface LCD: (the jumper is placed on the 2 right-hand pins of J23)

The Alice EduPad incorporates an HCT595 shift register (U6) to control the LCD display. The

chip select for the HCT595 is P6.7 of the MSP432 LaunchPad.

The U6 outputs QA-QH as the control and data bits D0-D1, D4-D7 for the LCD.

The pinouts of J1 are as follows:

Pin 1 GND

Pin 2 VCC (5V)

Pin 3 Connect to GNDvia the VR1 for contrast adjustment

Pin 4 QA (D0) RS pin for LCD module

Pin 5 GND Write only for LCD module

Pin 6 QB (D1) EN pin for LCD module

Pin 7 Not used

Pin 8 Not used

Pin 9 Not used

Pin 10 Mot used

Pin 11 QE (D4) DB4 pin for LCD module

Pin 12 QF (D5) DB5 pin for LCD module

Pin 13 QG (D6) DB6 pin for LCD module

Pin 14 GH (D7) DB7 pin for LCD module

Pin 15 Via a 100 Ohm resistor to VCC LED backlight for LCD module

Pin 16 Backlight ground EN/DIS for LED back light

The HCT595 is connected to theLCD controller with QE ~ QHto DB4 ~ DB7,

QA to RS, QB to enable. The QC and QD are not used.

The LCD module is hardwired for write-only operation.

4.10.2. Parallel interface LCD: (the jumper is placed on the 2 left-hand pins of J23)

The Alice EduPad also incorporates a parallel interface for the LCD, the P3.6, P5.2, P5.0 and

P4.6 are connected to the D4-D7 of the LCD via a 74HCT245 buffer (U18). The control pins are

P3.0 for LCD R/S and P6.7 for LCD EN.

4.11 Digital-to-Analog Converters (DAC)

The MCP4725, a 12-bit I2C DAC is installed for learning I2C communication.

It converts a digital binary code to an analog signal so a program can generate different

waveforms from the DAC.

The DAC’s analog output is provided on the J32, labeled as DAC. One way of testing the DAC

driver is to connect the DAC output to an ADC input, so a user can send a binary code to the

DAC and read the code back from the ADC.

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