Digilent Basys MX3 Bedienungsanleitung
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The Basys MX3 is a true MCU trainer board designed from the ground up around the teaching experience. Basys MX3 features the
PIC32MX370 from Microchip and was designed to be used with the MPLAB® X IDE. With an exhaustive set of peripherals, students gain
exposure to a wide range of embedded systems related concepts while using a professional grade tool set. Accompanied by free and open
source coursework, including seven in-depth teaching units and 15 complete labs, the Basys MX3 is a versatile MCU trainer board ideal for
teaching introductory embedded systems courses.
(https://reference.digilentinc.com/_media/reference/microprocessor/basys-mx3/basysmx3-0.png)
Basys MX3 Reference Manual
7/30/2019 Basys MX3 Reference Manual [Reference.Digilentinc]
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7/30/2019 Basys MX3 Reference Manual [Reference.Digilentinc]
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7/30/2019 Basys MX3 Reference Manual [Reference.Digilentinc]
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7/30/2019 Basys MX3 Reference Manual [Reference.Digilentinc]
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Basys MX3 PDF (https://reference.digilentinc.com/_media/reference/microprocessor/basys-mx3/basys_mx3_rm.pdf)
PIC32MX370F512L Microcontroller
MIPS32® M4K® core runs up to 96 MHz () using onboard 8 MHz () oscillator
512 KB of Program Flash Memory, 12 KB of Boot Flash Memory
128 KB of SRAM
Four Direct Memory Access (DMA) Modules
Two SPI, Two I²C, and Five UART serial interfaces
Parallel Master Port (PMP) for graphics interfaces
Five 16-bit Timers/Counters
Five Input Capture Modules
Five Output Compare Modules
85 I/O pins
54 pins support Peripheral Pin Select (PPS) for function remapping
Power
Powered from USB or any 5V external power source
USB and Debugging
USB-UART Bridge
USB programmer/debugger
30-pin Analog Discovery 2 connector
Download This Reference Manual
Features
7/30/2019 Basys MX3 Reference Manual [Reference.Digilentinc]
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Switches, Push-buttons, LEDs and Displays
5 Push-buttons
1 Reset button
8 Slide switches
8 LEDs
1 RGB LED ()
4 Digit 7-segment display
LCD () character display
Audio, Motor control, and other devices
Speaker with Audio Output Jack and volume control
Microphone with volume control
Dual H-Bridge Motor Driver for up to two 1.5 A Brushed DC Motors or one stepper motor
2 Servo Connectors
FIR-compatible IrDA Module
Potentiometer
3-axis, 12-bit accelerometer
4 MB () SPI Flash
Expansion Connectors
Two standard Pmod ports
16 Total microcontroller I/O
One I2C Connector
2 Total microcontroller I/O
(https://reference.digilentinc.com/_detail/reference/microprocessor/basys-mx3/basys_mx3_walkaround.png?
id=reference%3Amicroprocessor%3Abasys-mx3%3Areference-manual) (https://reference.digilentinc.com/_detail/reference/microprocessor/basys-
mx3/basysmx3_-_bottom.png?id=reference%3Amicroprocessor%3Abasys-mx3%3Areference-manual)
7/30/2019 Basys MX3 Reference Manual [Reference.Digilentinc]
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The Basys MX3 is fully supported by Microchip’s MPLAB X IDE. See section 1 on Programming the Board for more information on using
the Basys MX3 in MPLAB X IDE. Digilent provides a set of libraries called the Basys MX3 Library Pack that adds support for all onboard
peripherals. This library pack can be downloaded from the Basys MX3 Resource Center
(https://reference.digilentinc.com/reference/microprocessor/basys-mx3/start). The users may choose to implement their own functionality in
order to access Basys MX3 resources.
The Basys MX3 can also be used in Arduino IDE once the Digilent Core for Arduino IDE has been installed. Instructions for installing the
Digilent Core for Arduino IDE can be found on the Basys MX3 Resource Center.
Basys MX3 comes with a complete set of coursework designed to give teaching professionals flexibility in designing embedded systems and
other microprocessor courses. With almost 300 pages of material, “Embedded Systems Basys MX3 and PIC32MX370” covers topics from
toggling LEDs, motor control, and introduction to digital signal processing. Access to the full coursework is available on the Basys MX3
Resource Center.
Links to additional materials from Digilent and Microchip, including the Basys MX3 schematic and the PIC32MX370F512L datasheet, can
also be found on the Basys MX3 Resource Center.
The Basys MX3 uses a lot of devices to implement all of the functionality it provides (accelerometer, flash memory, motor driver, IRDA,
etc.). The manufacturers of each of these devices provide detailed descriptions of their functionality in their datasheets.
The Basys MX3 can be used with Microchip’s standard MPLAB X IDE. This software suite can be downloaded for free from the Microchip
website and includes a free evaluation copy of the XC32 compiler for use with the PIC32 microcontroller family.
MPLAB X IDE is the tool used to write, compile, program, and debug code running on the Basys MX3 board. Programming and
debugging a program on the Basys MX3 using the MPLAB X IDE is possible using the DEBUG USB connector. The board contains all
the required circuitry for MPLAB X to communicate with the onboard PIC32, so no additional programming tools need to be purchased.
When creating a new project in MPLAB X, a wizard allows you to setup the environment and device specific tools. The steps for this
include the following:
1. Select Microchip Embedded / Standalone Project, then use the “Select Device” option to specify the PIC32 microcontroller being
used: PIC32MX370F512L.
Software Support
Coursework and Additional Materials
1. Programming the Board
1.1. Programming Tools
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2. Select the programming tool named Basys MX3 corresponding to the board you want to program, under Licensed Debugger group.
3. Select the compiler you want to use.
Another useful tool included with MPLAB X is MPLAB X IPE. This tool allows the direct programming/erasing of the microcontroller,
but it does not provide an environment for writing, compiling, and debugging the code. Please see Microchip documentation for
instructions on using this tool.
It is often very helpful to include the xc.h header when writing code for the Basys MX3:
#include <xc.h>
This further provides the inclusion of another header (p32mx370f512l.h) into the project that provides useful definitions such as:
Register names
example (register LATA is set to 0):
LATA = 0;
Specific register bits that can be accessed using a structure having the name of the register suffixed by “bits”.
1.2. Programming Basics
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example (bit LATA1 of the register LATA is set to 1):
LATAbits.LATA1 = 1;
Digilent provides a set of libraries called the Basys MX3 Library Pack that addresses much of the functionality on the Basys MX3:
ACL () (accelerometer)
ADC () (Analog to Digital converter)
AUDIO
BTN (buttons)
IRDA
LCD ()
LED ()
MIC (microphone)
MOT (motors)
PMODS
RGBLED
SPIFLASH
SSD ()
SWT (Switches)
UART
These libraries are wrappers over the lower level functions that access the registers, allowing the user to call the functionality using functions
like:
LED_Init();
LED_SetValue(4, 1); //turn on LED4
This set of libraries comes with the user documentation, but basically this is what you have to do in order to use them:
Include in your project the .c and .h files corresponding to the module you want to use (for example led.c and led.h).
In your code, include the header of the module:
#include "led.h"
In your code, call the needed functions
The PIC32MX370F512L microcontroller offers access to all the board resources through its pins, so understanding how to access their
features is very important. The list that describes each pin functionality is included in Appendix 3. You can see that each pin may have
multiple functions, but all pins have one feature in common: they have an associated digital I/O (input/output) bit. On PIC32
microcontrollers, the I/O pins are grouped into I/O Ports and are accessed via peripheral registers in the microcontroller. There are seven
I/O Ports numbered A–G and each is 16 bits wide. Depending on the PIC32 microcontroller, some of the I/O Ports are not present, and
not all 16 bits are accessible in all I/O Ports.
Each I/O Port has the following control registers: TRIS, LAT, PORT, ANSEL, CNPU, CNPD, and ODC. The registers for each I/O Port
are named after it: TRISx, LATx, PORTx, ANSELx, CNPUx, CNPDx and ODCx. For example, port A will have the following assigned
registers: TRISA, LATA, etc.
The TRIS register is used to set the pin direction. Setting a TRIS bit to 0 makes the corresponding pin an output. Setting the TRIS bit to 1
makes the pin an input.
The LAT register is used to write to the I/O Port. Writing to the LAT register sets any pins configured as outputs. Reading from the LAT
register returns the last value written.
The PORT register is used to read from the I/O Port. Reading from the PORT register returns the current state of all the pins in the I/O
Port. Writing to the PORT register may not produce the expected result, therefore writing to LAT register is recommended.
To summarize: write using LAT, read using PORT.
PIC32 microcontrollers allow any pin set as an output to be configured as either a normal digital output or as an open-drain output. The
ODC register is used to control the output type. Setting an ODC bit to 0 makes the pin a normal output and setting it to 1 makes the pin an
open-drain output.
The multifunction pins that include analog input functionality need to be configured in order to be used as digital pins by clearing the
corresponding bit from ANSEL register. These pins will include ANx in their name. For example: AN11/PMA12/RB11 for RB11.
1.3. Digital Inputs and Outputs
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This microcontroller has a weak pull-up and a weak pull-down connected to each pin. These pull-ups and pull-downs are enabled/disabled
by setting the corresponding bits from CNPU and CNPD registers to 1/0. The default setting is 0 (pull-ups and pull-downs disabled).
You can see a typical example of I/O pin configuration as output and digital output operations in the User LEDs section.
You can see a typical example of I/O pin configuration as input (including analog disable) and digital input operations in the User Buttons
section.
Refer to the PIC32MX3XX/4XX Family Datasheet, and the PIC32 Family Reference Manual, Section 12, IO Ports, for more detailed
information about the operation of the I/O Ports in the microcontroller.
Users may independently map the input and/or output of most digital peripherals to a fixed subset of digital I/O pins. Pins that support the
peripheral pin select feature include the designation “RPn” in their full pin designation, where “RP” designates a remappable peripheral and
“n” is the remappable port number.
The available peripherals to be mapped are digital-only. These include general serial communications (UART and SPI), general purpose
timer clock inputs, timer-related peripherals (input capture and output compare), and interrupt-on-change inputs.
On the other hand, some peripheral modules cannot be included in the peripheral pin select feature because it requires special I/O circuitry
on a specific port and it cannot be easily connected to multiple pins. These modules include I2C and analog-to-digital converters (ADC ()),
among others.
Peripheral pin select features are controlled using two sets of Special Function Registers (SFRs): one to map peripheral inputs, and one to
map peripheral outputs.
The peripheral inputs are mapped and named from the peripheral perspective (based on the peripheral). The [pin name]R registers, where
[pin name] refers to the specific peripheral pins, are used to configure peripheral input mapping. TABLE 12-1 in the PIC32MX370F512L
datasheet from Microchip (and Appendix 1 in this document) shows the different pins and their values available to assign to a peripheral pin.
The following example shows how different I/Os, such as pin RF4, can be assigned to U1RX input pin of the UART1 peripheral:
U1RXR = 0x02; // 0010 corresponds to RF4
The peripheral outputs are mapped and named from the pin perspective (on the basis of the pin). The RPnR registers (Register 12-2) are
used to control output mapping. The PIC32MX370F512L datasheet details in TABLE 12-2 (and Appendix 2 in this document) the values
corresponding to each IO pin, associated to each available peripheral pin. Note that the current version of the Basys MX3 schematic (B.0)
incorrectly lists RD6 and RD7 as remappable pins (RPD6 and RPD7, respectively); these pins are not remappable on the
PIC32MX370F512L.
The following example shows how different peripheral outputs, such as U3TX, can be assigned to pin RF4:
RPF4R = 0x01; // 0001 corresponds to U3TX
1.4. Remappable pins
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