MattairTech MT-DB--U1 User manual
MT-DB-U1 Manual
Table of Contents
Overview........................................................................................................................4
Introduction.......................................................................................................................................4
MT-DB-U1 Features..........................................................................................................................4
AT90usb162 Features.......................................................................................................................5
MT-DB-U1 Hardware.....................................................................................................7
Layout / Header Pins.........................................................................................................................7
Solder Jumpers.................................................................................................................................8
Pin Descriptions................................................................................................................................9
PWM Filters.....................................................................................................................................10
Clock Source...................................................................................................................................10
HWB Jumper / RESET button / LED...............................................................................................10
ISP Header.....................................................................................................................................11
Power Configuration..................................................................................................12
USB Bus Powered -- 5V..................................................................................................................12
USB Bus Powered – 3.3V...............................................................................................................12
Externally Powered – 4.0V to 5.5V..................................................................................................13
Externally Powered – 3.0V to 3.6V..................................................................................................13
USB Shield......................................................................................................................................13
Arduino Compatibility (IDE 1.6.7)..............................................................................14
What's New.....................................................................................................................................14
Summary.........................................................................................................................................14
Special Notes..................................................................................................................................15
Pin Configurations...........................................................................................................................15
MT-DB-U6 (AT90USB64/AT90USB128).........................................................................................16
MT-DB-U4 (ATmega32U4)..............................................................................................................17
MT-DB-U1/MT-DB-U2 (AT90USB162/ATmega32U2).....................................................................17
Pin Capabilities...............................................................................................................................18
Using Arduino with MattairTech USB boards..................................................................................19
Serial Monitor..................................................................................................................................19
Updated Tone.cpp...........................................................................................................................19
Detailed Memory Usage Output After Compilation..........................................................................20
USB Technical Notes......................................................................................................................20
Installation.......................................................................................................................................21
Driver Installation............................................................................................................................21
Windows.........................................................................................................................................21
Linux...............................................................................................................................................22
OS X...............................................................................................................................................22
AVR Core Installation......................................................................................................................22
Uploading the First Sketch..............................................................................................................23
USB CDC Bootloader (Arduino compatible)....................................................................................23
Bootloader Firmware Installation Using the Arduino IDE.................................................................23
Using AVRDUDE Standalone.........................................................................................................24
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Possible Future Additions................................................................................................................24
ChangeLog.....................................................................................................................................24
License and credits.........................................................................................................................25
CDC Bootloader (Arduino/AVRDUDE)......................................................................26
CDC Serial Driver............................................................................................................................26
CDC Bootloader..............................................................................................................................26
DFU Bootloader (FLIP/dfu-programmer)..................................................................28
FLIP..............................................................................................................................29
dfu-programmer..............................................................................................................................31
Running Demo Program............................................................................................32
Schematic....................................................................................................................33
Troubleshooting / FAQ...............................................................................................34
Support Information...................................................................................................34
Acknowledgments......................................................................................................34
Legal.............................................................................................................................35
Appendix A: Precautions...........................................................................................36
Appendix B: Other MattairTech Products................................................................37
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Overview
Overview
Introduction
The MT-DB-U1 is a development board for the Atmel AT90usb162 USB microcontroller. The
AT90usb162 contains 16 KB of flash, 512 bytes SRAM, 512 bytes EEPROM, 22 programmable IO
pins, and a USB device controller. The board has 32 pins in a dual inline configuration with 100 mil pin
spacing and 600 mil row spacing which allows for easy mounting on a breadboard. It includes a mini
USB connector, status LED, 16MHz crystal, reset button, HWB boot jumper, 3 PWM filters, and ISP
header pads. A bootloader comes preinstalled which allows programming of the chip over USB
without an external programmer. The ISP header can be used with an external programmer for in-
system programming. This header can be reconfigured to allow the MT-DB-U1 itself to be an ISP
programmer, or to be used as a SPI master or slave. The board can be powered at 5V via USB, at
3.3V via the AT90usb162 internal regulator and USB, or it can be powered externally (3V – 3.6V or
4.0V – 5.5V). All programmable IO pins are routed to headers, including those used by on-board
hardware. The chip can be clocked externally, and the board is compatible with HV programming. The
USB connections are also routed to header pins, which allows for panel-mount USB connectors. The
PCB is high-quality with ENIG (gold-plated) finish, red soldermask, and white screenprinting showing
the pinout. It measures approximately 1.7” x 0.8” (42mm x 20mm) and is 0.062” (1.6mm) thick.
MT-DB-U1 Features
●AT90usb162 USB microcontroller
●16KB FLASH, 512 bytes SRAM, 512 bytes EEPROM
●USB device controller, Serial USART, and SPI communications
●2 timers with 5 PWM channels
●Arduino compatible (now supports IDE 1.6.7 and boards manager)
●CDC (Arduino/AVRDUDE) or DFU (FLIP) bootloader preinstalled
●ISP header pads (program chip using external programmer)
●16MHz crystal
●Green Status LED
●3 RC PWM filters on each output compare pin of 16-bit timer 1 (can be disconnected)
●Reset button
●Bootloader selection jumper
●Mini USB connector
●Can be powered via USB at 5V (Vbus) or 3.3V (AT90usb162 internal regulator)
●Can be powered externally at 3V to 3.6V or 4V to 5.5V
●All programmable IO pins routed to headers (including those used by on-board hardware)
●USB pins routed to header pins (for panel-mount USB connector)
●High-quality PCB with gold-plated finish and red soldermask
●DIL-32 board, standard 0.1" pin spacing. Can be mounted on a breadboard
●Measures approx. 1.7” x 0.8” (42mm x 20mm) and 0.062” (1.6mm) thick.
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AT90usb162 Features
●High Performance, Low Power AVR®8-Bit Microcontroller
●Advanced RISC Architecture
125 Powerful Instructions – Most Single Clock Cycle
32 x 8 General Purpose Working Registers
Fully Static Operation
Up to 16 MIPS Throughput at 16 Mhz
●Non-volatile Program and Data Memories
16K Bytes of In-System Self-Programmable Flash
512 Bytes EEPROM
512 Bytes Internal SRAM
Write/Erase Cycles: 10,000 Flash/ 100,000 EEPROM
Data retention: 20 years at 85°C/ 100 years at 25°C(1)
Optional Boot Code Section with Independent Lock Bits
In-System Programming by on-chip Boot Program
True Read-While-Write Operation
Programming Lock for Software Security
●USB 2.0 Full-speed Device with Interrupt on Transfer Completion
Complies fully with Universal Serial Bus Specification REV 2.0
48 MHz PLL for Full-speed Bus Operation: 12 Mbit/s data rate
Fully independant 176 bytes USB DPRAM for endpoint memory
Endpoint 0 for Control Transfers: from 8 up to 64-bytes
4 Programmable Endpoints:
IN or Out Directions
Bulk, Interrupt and IsochronousTransfers
Programmable maximum packet size from 8 to 64 bytes
Programmable single or double buffer
Suspend/Resume Interrupts
Microcontroller reset on USB Bus Reset without detach
USB Bus Disconnection on Microcontroller Request
●Peripheral Features
One 8-bit Timer/Counters with Separate Prescaler and Compare
(two 8-bit PWM channels)
One 16-bit Timer/Counter with Prescaler, Compare and Capture
(three 8-bit PWM channels)
USART with SPI master mode and hardware flow control (RTS/CTS)
Master/Slave SPI Serial Interface
Programmable Watchdog Timer with Separate On-chip Oscillator
On-chip Analog Comparator
Interrupt and Wake-up on Pin Change
●On Chip Debug Interface (debugWIRE)
●Special Microcontroller Features
Power-On Reset and Programmable Brown-out Detection
Internal Calibrated Oscillator
External and Internal Interrupt Sources
5 Sleep Modes: Idle, Powersave, Powerdown, Stby., and Ext. Stby.
●I/O and Packages
22 Programmable I/O Lines
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Pin Descriptions
Pin Description
Gnd Ground
5V, Vbus 5V output from USB Vbus. Vbus pin and 5V pin are tied together.
Vcc Voltage input pin. Use solder jumper J8 to configure. This pin is connected
to the Vcc and AVcc pins on the microcontroller, as well as the ISP header
and reset pullup. See Power Configuration Section.
3.3V 3.3V output from the microcontroller internal 3.3V regulator. This pin is
connected to Ucap on the microcontroller.
X2 (C0) This pin can be connected to the XTAL2 pin of the microcontroller using
jumper J7. This is useful if pin C0 is used as GPIO (if external clock is
used). This pin is disconnected by default (onboard crystal is used).
X1 This pin can be connected to the XTAL1 pin of the microcontroller using
jumper J7. This is useful if an external clock is used. This is also useful for
HV programming or recovery from incorrectly set fuses. This pin is
disconnected by default (onboard crystal is used).
C2 GPIO pin (Port C) Consult datasheet for functionality.
D0 - D7 GPIO pins (Port D) Consult datasheet for functionality.
D0 / LED The green status LED is connected to this pin when solder jumper J2 is
set. The LED is connected to ground through a 240 ohm resistor. The user
application is free to use this LED. Drive the pin high to turn on the LED.
D7 / HWB This pin is connected to the bootloader jumper (HWB). The jumper is
connected to ground through a 240 ohm resistor. The pin is sampled after
all reset sources, including power-up. If the pin is low (HWB jumper
installed), then the bootloader is run. If the pin is high (HWB jumper
removed), then the user application is run. This pin functions as a normal
GPIO pin at all other times. The 240 ohm resistor provides short-circuit
protection in case the pin is used as an output and the jumper is installed.
RST Connects to reset pin of microcontroller as well as the reset button. A 10K
pullup resistor and 100nF capacitor are connected to this pin. If jumper J1
is set to ISP In, then RST is also connected to pin 5 of the ISP header.
B0 - B6 GPIO pins (Port B) Consult datasheet for functionality.
B7 PWM filter C output (OC.1C) or pin B7, depending on jumper
configuration.
C4, C7 GPIO pins (Port C) Consult datasheet for functionality.
C5 PWM filter B output (OC.1B) or pin C5, depending on jumper
configuration.
C6 PWM filter A output (OC.1A) or pin C6, depending on jumper
configuration.
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D+, D- USB data pins. Can be used for panel-mount connectors.
PWM Filters
There are three PWM filters, which can be used to smooth out a PWM square wave
into an analog voltage (with some ripple). The outputs of these filters can be connected to
header pins C6, C5, and B7 using solder jumpers J4, J5, and J3 respectively (factory default).
The filters consist of a 1K resistor and 100nF capacitor. The cutoff frequency is:
f3db=1/2RC=1/21K∗100nF=1/20.0001=1600Hz
This is a first-order low-pass filter that can output levels from 0V to Vcc. All three filter
inputs are connected to the 16-bit timer 1 output compare pins (OC.1A, OC.1B, and OC.1C).
The filter inputs are always connected to the microcontroller. Therefore, if the solder jumpers
are configured to connect the microcontroller pins directly to the header pins, there will be
some loading on the pin (1K resistor in series with a 100nF capacitor to ground).
Clock Source
By default, a 16 MHz crystal is installed and connected to the XTAL pins of the
AT90usb162. This 16 Mhz clock must be divided by 2 in software if the Vcc voltage is less
than 4.5V. If an external clock is is used, solder jumper J6 can be switched to connect the
microcontroller pin directly to header pin rather than the onboard crystal. An external clock
signal can then be applied to pin X1 (XTAL1). This will also free up microcontroller pin C0
(XTAL2), which can be configured in the microcontroller as a GPIO pin and routed to header
pin X2 by switching solder jumper J7.
HWB Jumper / RESET button / LED
The HWB Jumper is used to select either the bootloader or user application. The pin is
sampled after reset or power-up. Note that the hardware HWB function of the AT90usb162 is
disabled. That is, the HWBE fuse is disabled. The bootloader startup code is always run after reset or
power-up (BOOTRST fuse is set). The code samples the state of the HWB pin. If the pin is low, the
bootloader continues to run. If the pin is high, the user application is run. The green LED will pulse on
and off using a continuously changing PWM period when the DFU bootloader is running. If the
preinstalled demo program is running, it will be lit when USB is connected. Otherwise, the state of the
LED is controlled by the user application. The bootloader always runs at 8 MHz, which is compatible
with lower voltages.The user may set the cpu speed to 16MHz in software, if running at 5V.
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Jumper Mode Driver
No User Program CDC (COM port) (optional)
Yes Bootloader Program CDC Serial/DFU Bootloader
It is not necessary to remove and replace the jumper when switching between the bootloader
and the user application. The jumper can be left on. After FLASH programming, the CDC bootloader
will automatically jump to the application. If using the DFU bootloader, then you can command FLIP
or dfu-programmer to jump to the application. Then, when running the application, the reset button can
be pressed to re-enter the bootloader. This is useful when writing and debugging firmware. When the
firmware is complete, the jumper can be removed so that future resets will always run the application.
The pins associated with the LED, jumper, and reset button are all routed to header pins. The
LED can be disconnected by unsoldering jumper J2. The jumper is connected to pin D7 on one side
and to ground through a 240 ohm resistor on the other side. There is a 10K pullup on the reset line.
ISP Header
The ISP header is configured by default to allow ISP programming using an external
programmer. That is, RESET is routed to pin 5. Pin 1 is marked on the board (it is the pin closest to
the chip). The ISP header can be reconfigured so that pin PB0 (SS) is connected to pin 5 rather than
RESET. This can be done by switching solder jumper J1. This allows the MT-DB-U1 to be used as an
AVRISPmkII programmer itself, using Dean Camera's AVRISPmkII software available at
http://www.fourwalledcubicle.com/. A precompiled hex file will be made available at
http://www.mattairtech.com/ on the MT-DB-U1 product page. Note that when using the ISP header in
this way, Vcc and ground are output to the target board. Therefore, the target board should not be
powered itself. You should also verify that it is safe to power the target board through the ISP
connector. Another use for the ISP header configured with SS on pin 5 is to make use of SPI, either as
a master or slave. SPI can also be used on the normal DIL headers. When using the ISP header, you
may need to remove the HWB jumper to allow the ISP connector to fit.
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Power Configuration
Power Configuration
The MT-DB-U1 can be powered in a variety of ways by utilizing solder jumper J8 located on
the bottom of the board. By default, the board is configured to be powered via USB, with Vcc at 5V,
and the microcontroller internal 3.3V regulator enabled and powering only the USB pads. The
microcontroller clock is configured at boot to run at 8MHz. The following lists some of the
configurations possible. Code may have to be re-compiled when switching configurations (ie: to
change cpu clock speed and/or internal regulator power).
Power Configuration Jumper J8 Regulator Max CPU
USB bus powered – 5V Vcc (default) 3.3V Vcc = 5V = UVcc Vcc Enable 16 MHz
USB Bus powered – 3.3V Vcc 3.3V = Vcc 5V = UVcc Vcc Enable 8 MHz
Externally powered – 4.0 to 5.5V Vcc 3.3V Vcc 5V UVcc = Vcc Enable 16 MHz
Externally powered – 3.0 to 3.6V Vcc 3.3V = Vcc 5V UVcc = Vcc Disable 8 MHz
WAR I G
Care must be taken when configuring the solder jumpers.
It is possible to cause permanent damage to the device or the
power supply by improperly setting the jumpers.
Do not change any jumpers while the unit is powered.
When using the microcontrollers internal regulator to power itself,
be sure not to exceed the regulator maximum current output.
USB Bus Powered -- 5V
By default, the MT-DB-U1 is configured for 5V from the USB connector (Vbus). In this
configuration, solder jumper J8 is set such that Vcc and UVcc are connected to Vbus (5V). The AVR
internal 3.3V regulator must be enabled (default setting). This will supply 3.3V to the USB pads and
3.3V header pin.
USB Bus Powered – 3.3V
The internal 3.3V regulator can be used to supply the AVR itself with 3.3V. In this configuration,
solder jumper J8 is set such that Vcc is connected to 3.3V and UVcc is connected to Vbus (5V). The
AVR internal 3.3V regulator must be enabled (default setting). This will supply 3.3V to the AVR itself,
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the USB pads, and the 3.3V header pin. Take care not to exceed the datasheet maximum current
output of the internal regulator. Note that at 3.3V, the AVR should be set to run at 8MHz or less. This
can be done in software using the prescaler.
Externally Powered – 4.0V to 5.5V
In this configuration, solder jumper J8 is set such that UVcc is connected to Vcc. Vcc is then
supplied externally with 4.0V to 5.5V on the Vcc header pin. The 5V pin still outputs 5V when the USB
cable is plugged in. The AVR internal 3.3V regulator must be enabled (default setting). This will supply
3.3V to the USB pads and 3.3V header pin. Note that when using a voltage less than 4.5V, the AVR
should be set to run at 8MHz or less. This can be done in software using the prescaler.
Externally Powered – 3.0V to 3.6V
In this configuration, solder jumper J8 is set such that both UVcc and 3.3V are connected to
Vcc. Vcc is then supplied externally with 3.0V to 3.6V on the Vcc header pin. The internal 3.3V
regulator must be disabled in software. Note that the regulator is always enabled after reset or
powerup, and is on when the bootloader is running. It is the responsibility of the user application to
disable the regulator. The 5V pin still outputs 5V when the USB cable is plugged in. In this
configuration, the AVR should be set to run at 8MHz or less. This can be done in software using the
prescaler.
USB Shield
Jumper J9 can be soldered to connect the USB shield to ground. The USB specification calls
for the USB shield to be connected to ground on the host side only. However, it may be desired to
ground this on the device side. An 0603 SMT component may be soldered on the solder jumper pads
as well.
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Arduino Compatibility (IDE 1.6.7)
Arduino Compatibility (IDE 1.6.7)
This is a fork of the Arduino AVR core from arduino/Arduino (hardware/arduino/avr/ directory) on
GitHub. This will be used to maintain Arduino support for AVR boards including the MattairTech MT-
DB-U1, MT-DB-U2, MT-DB-U4, and the MT-DB-U6 (see https://www.mattairtech.com/).
This core is intended to be installed using Boards Manager (see below). To update from a previous
version, click on MattairTech AVR Boards in Boards Manager, then click Update.
What's ew
●Initial release of the 1.6.x compatible AVR core.
●Any combination of CDC, HID, or UART can be used (or no combination), by using the Tools-
>Communication menu.
●Note that switching between CDC and CDC+HID will require re-selecting the COM port.
●More detailed memory usage at end of compilation (see below).
●Merged in upstream updates.
Summary
Feature MT-DB-U6 MT-DB-U4 MT-DB-U2 MT-DB-U1
Microcontroller AT90USB64/AT90US
B128, 8-Bit AVR
ATmega32U4, 8-
Bit AVR
ATmega32U2, 8-
Bit AVR
AT90USB162, 8-
Bit AVR
Clock Speed 16 MHz 16 MHz 16 MHz 16 MHz
Flash Memory 128 KB
(AT90USB128) / 64
KB (AT90USB64)
32 KB 32 KB 16 KB
SRAM 8 KB (AT90USB128) /
4 KB (AT90USB64) 2.5 KB 1 KB 512 B
EEPROM 4 KB (AT90USB128) /
2 KB (AT90USB64) 1 KB 1 KB 512 B
Digital Pins 46* 26 21 21
Analog Input Pins 8 (10-bit) 11* (10-bit) No analog No analog
PWM Output Pins 7* 7 4 4
External
Interrupts 6* (8 PCI T)* 5 (8 PCI T)* 8 (13 PCI T)* 8 (13 PCI T)*
USB CDC and HID CDC and HID CDC and HID CDC and HID
UART (Serial) 1 1 1 1
SPI 1 1 1 1
I2C (TWI) 1 1 o I2C o I2C
Operating Voltage 5V/3.3V 5V/3.3V 5V/3.3V 5V/3.3V
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Feature MT-DB-U6 MT-DB-U4 MT-DB-U2 MT-DB-U1
DC Current per I/O
Pin 20 mA 20 mA 20 mA 20 mA
●Only INT pins are supported in this core (PCINT pins are not supported).
●MT-DB-U4: 1 additional analog pin is available by disconnecting the LED (solder jumper on rev B
and higher boards)
●MT-DB-U6-64/128: 2 additional digital, 2 additional PWM, or 2 additional INT pins available with
RTC crystal removed. Note however, that the RTC crystal holes are smaller and closer together
than the header pin holes.
Special otes
●Tools->Communications menu
Currently, the Tools->Communications menu must be used to select the communications
configuration. This configuration must match the included libraries. For example, when including the
HID and Keyboard libraries, you must select an option that includes HID (ie: CDC_HID_UART).
This menu is currently needed to select the USB PID that matches the USB device configuration
(needed for Windows). This may become automatic in a future release.
●Include platform specific libraries
You may need to manually include platform specific libraries such as SPI.h, Wire.h, and HID.h.
●EXCEPTION_FOR_57600
The MattairTech ArduinoCore-avr uses a more accurate baud rate for 57600 than the stock
arduino. When using the USART to communicate with another Arduino, define
EXCEPTION_FOR_57600.
●New interrupt mapping
The MattairTech ArduinoCore-avr has changed interrupt pin mapping from the previous 1.0.5
release. The arduino pin number is now used with attachInterrupt() instead of the interrupt number.
See 'Pin Configurations' below.
Pin Configurations
To determine the Arduino pin number, start at the upper-left corner of the board opposite of the USB
connector. This is pin 0 (most boards have a 0 printed nearby). The numbering increases in a counter-
clockwise direction around the board. Many pins have multiple configurations available. For example,
arduino pin 29 (AVR pin D0) on the MT-DB-U6 can be a PWM output (analogWrite), an external interrupt
input, digital I/O, or the SCL pin of I2C.
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MT-DB-U6 (AT90USB64/AT90USB128)
================== MattairTech MT-DB-U6 (AT90USB64/AT90USB128) ==========================
INT/Other P M Analog Digital Digital P M INT/Other Comm
=========================================================================================
---------------------
LED 0 | E0/L O O RST |
1 | E1 H B E2/B| 37 JUMPER
2 | C0 D7 | 36
3 | C1 O O D6 | 35
4 | C2 O O D5 | 34 XCK
5 | C3 O O D4 | 33
6 (TC3C) 6 | C4 O O * D3 | 32 32 (INT3) TX
7 (TC3B) 7 | C5 PORT A D2 | 31 31 (INT2) RX
8 (TC3A) 8 | C6 D1 | 30 30 (TC2B) 30 (INT1) SDA
9 | C7 D0 | 29 29 (TC0B) 29 (INT0) SCL
| |
JTAG TDI 10 (ADC7) 10 | F7 E3 | 28
JTAG TDO 11 (ADC6) 11 | F6 P R S E7 | 27 27 (INT7)
JTAG TMS 12 (ADC5) 12 | F5 O B7 | 26 26 (TC1C)
JTAG TCK 13 (ADC4) 13 | F4 - + O B6 | 25 25 (TC1B)
14 (ADC3) 14 | F3 O O B5 | 24 24 (TC1A)
15 (ADC2) 15 | F2 P R IN B4 | 23 23 (TC2A)
16 (ADC1) 16 | F1 B3 | 22 MISO
17 (ADC0) 17 | F0 * O O B2 | 21 MOSI
18 (INT6) 18 | E6 O O B1 | 20 SCLK
| Aref O O B0 | 19 SS
| Vbus ISP 3.3V|
| D- _____ Vcc |
| D+ | | 5V |
| Gnd | USB | Gnd |
---------------------
* Pins 38-45 are on the PORT A header. Pins 46 and 47 are the RTC crystal pins E4 and E5
in use by the RTC by default). With RTC crystal removed, there are 2 additional digital
pins 46 and 47), 2 additional PWM pins TIMER2A on pin 23 and TIMER2B on pin 30), and 2
additional INT pins INT4 on pin 46 and INT5 on pin 47). All pins can be used with
analogRead ). 8 of these pins are actual analog inputs, the rest connect to the internal
reference pin 47) or ground.
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MT-DB-U4 (ATmega32U4)
========================= MattairTech MT-DB-U4 (ATmega32U4) =============================
INT/Other P M Analog Digital Digital Analog P M INT/other Comm
=========================================================================================
-------------------
0 (ADC11) 0 | B4 RST |
1 (TC1A) 1 (ADC12) 1 | B5 D7/L| 25 25 (ADC10) 25 (TC4D) LED
2 (TC1B) 2 (ADC13) 2 | B6 D6 | 24 24 (ADC9)
3 (TC3A) 3 | C6 D5 | 23 23 (REF)
4 (TC4A) 4 | C7 D4 | 22 22 (ADC8)
JUMPER 5 | E2/B D3 | 21 21 (INT3) TX
| Agnd D2 | 20 20 (INT2) RX
6 (ADC7) 6 | F7 D1 | 19 19 (INT1) SDA
7 (ADC6) 7 | F6 D0 | 18 18 (TC0B) 18 (INT0) SCL
8 (ADC5) 8 | F5 xtal1|
9 (ADC4) 9 | F4 xtal2|
10 (ADC1) 10 | F1 B7 | 17 17 (TC1C)
11 (ADC0) 11 | F0 B3 | 16 MISO
12 (INT6) 12 (TEMP) 12 | E6 B2 | 15 MOSI
| Aref B1 | 14 SCLK
| Avcc B0 | 13 SS
| Vbus 3.3V|
| D- _____ Vcc |
| D+ | | 5V |
| Gnd | USB | Gnd |
-------------------
* Because of the unusual layout of the ATmega32U4, all pins can be used with analogRead ).
12 of these pins are actual analog inputs 1 used by LED), the rest connect to the internal
reference, internal temperature sensor, or ground.
MT-DB-U1/MT-DB-U2 (AT90USB162/ATmega32U2)
=============== MattairTech MT-DB-U1/MT-DB-U2 (AT90USB162/ATmega32U2) ===================
Comm Interrupt P M Digital Digital Interrupt P M Comm/other
=========================================================================================
-------------------
SPI SS 0 | B0 RST |
SPI SCLK 1 | B1 D7 | 20 20 (INT7) JUMPER
SPI MOSI 2 | B2 D6 | 19 19 (INT6)
SPI MISO 3 | B3 D5 | 18
4 | B4 D4 | 17 17 (INT5)
5 | B5 D3 | 16 16 (INT3) USART1 TX
6 | B6 D2 | 15 15 (INT2) USART1 RX
7 (TC1C) 7 | B7 D1 | 14 14 (INT1)
8 (INT4) 8 | C7 D0 | 13 13 (INT0) 13 (TC0B) LED
9 (TC1A) 9 | C6 C2 | 12
10 (TC1B) 10 | C5 X1 |
11 | C4 X2 |
| Vbus 3.3V|
| D- _____ Vcc |
| D+ | | 5V |
| Gnd | USB | Gnd |
-------------------
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Pin Capabilities
●Digital: All pins can be used for general purpose I/O
●Supports INPUT, OUTPUT, and INPUT_PULLUP.
●Each pin can source or sink a maximum of 20 mA.
●Internal pull-up resistors of 20-50 Kohms (disconnected by default).
●Use the pinMode(), digitalWrite(), and digitalRead() functions.
●Analog Inputs: 8 pins (MT-DB-U6) or 11 pins (MT-DB-U4) can be configured as ADC
analog inputs.
●These are available using the analogRead() function.
●All pins can be used for GPIO and some pins can be used for other digital functions (ie.
pwm or serial).
●Each pin provides 10 bits of resolution (1024 values).
●Each pin measures from ground to 5.0 volts.
●The upper end of the measurement range can be changed using the AREF pin and the
analogReference() function.
●PWM: 7 pins (MT-DB-U6, MT-DB-U4) or 4 pins (MT-DB-U2, MT-DB-U1) can be configured
as PWM outputs.
●Available using the analogWrite() function.
●Each pin provides 8 bits of resolution (256 values) by default.
●External Interrupts: Up to 8 pins can be configured with external interrupts.
●6 pins (MT-DB-U6), 5 pins (MT-DB-U4), or 8 pins (MT-DB-U2, MT-DB-U1).
●Available using the attachInterrupt() function.
●Serial: 1 pair of pins can be configured for TTL serial I/O.
●MT-DB-U6: Serial1: pin 31 (RX) and pin 32 (TX).
●MT-DB-U4: Serial1: pin 20 (RX) and pin 21 (TX).
●MT-DB-U2, MT-DB-U1: Serial1: pin 15 (RX) and pin 16 (TX).
●SPI: 3 or 4 pins can be configured for SPI I/O (SPI).
●MT-DB-U6: Pin 21 (MOSI), pin 20 (SCK), pin 22 (MISO), and optionally pin 19 (SS, not
currently used).
●MT-DB-U4: Pin 15 (MOSI), pin 14 (SCK), pin 16 (MISO), and optionally pin 13 (SS, not
currently used).
●MT-DB-U2, MT-DB-U1: Pin 2 (MOSI), pin 1 (SCK), pin 3 (MISO), and optionally pin 0
(SS, not currently used).
●SPI communication using the SPI library.
●TWI (I2C): 2 pins can be configured for TWI I/O (Wire).
●MT-DB-U6: Pin 30 (SDA) and pin 29 (SCL).
●MT-DB-U4: Pin 19 (SDA) and pin 18 (SCL).
●MT-DB-U2, MT-DB-U1: TWI not present
●TWI communication using the Wire library.
●LED: One pin can be configured to light the onboard LED (LED_BUILTIN).
●Pin 0 (MT-DB-U6), pin 25 (MT-DB-U4), or pin 13 (MT-DB-U2, MT-DB-U1).
●Bring the pin HIGH to turn the LED on.
●AREF: One pin can be configured as an AREF analog input.
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●The upper end of the analog measurement range can be changed using the
analogReference() function.
●Reset: Bring this line LOW to reset the microcontroller.
Using Arduino with MattairTech USB boards
Because of the similarities with the Arduino Leonardo, please read
http://arduino.cc/en/Guide/ArduinoLeonardo first.
Within the Arduino IDE Tools menu, select the appropriate MattairTech board, Frequency/Voltage,
Processor, Communications setting, and COM port. There are 2 Frequency/Voltage configurations for
each board, 16MHz(5V) and 8MHz(3.3V). You may select 8MHz even if using 5V. When operating at
3.3V, you should select 8MHz. Operating at 16MHz at 3.3V is out of spec, but should work fine at
room temperatures. Be sure to select the Communications setting that matches your sketch (by
default, this is CDC_ONLY). This is important.
Note that some example sketches indicate the use of pins using the naming convention D2, D3, etc.
These are Arduino digital pins, not to be confused with port D pins. Most MattairTech USB AVR
boards are printed with both port pin names as well as sequential numbers indicating the Arduino pin
number. You may use the 'A' or 'D' prefixes, but they are simply aliased to the arduino pin number (ie:
A2 = D2 = 2).
There are several libraries included with Arduino. Some of these need simple changes to work with
MattairTech boards. Usually, only pin mappings need to be changed.
Serial Monitor
To print to the Serial Monitor over USB, use 'Serial'. Serial points to SerialUSB (Serial1 is a UART).
Unlike most Arduino boards (ie. Uno), USB AVR based boards do not automatically reset when the
serial monitor is opened. To see what your sketch outputs to the serial monitor from the beginning, the
sketch must wait for the SerialUSB port to open first. Add the following to setup():
while !Serial) ;
Remember that if the sketch needs to run without SerialUSB connected, another approach must be
used. You can also reset the board manually with the Reset button if you wish to restart your sketch.
However, pressing the Reset button will reset the AVR chip, which in turn will reset USB
communication. This interruption means that if the serial monitor is open, it will be necessary to close
and re-open it to restart communication.
Updated Tone.cpp
Tone.cpp now supports multiple simultaneous tone generation (one tone per timer). The MT-DB-U6
currently supports up to 4 simultaneous tones using timers 3, 1, 2, and 0 if not using the RTC,
otherwise, timers 3, 1, and 0 are used for 3 tones. The MT-DB-U4 currently supports up to 3
simultaneous tones using timers 3, 1, and 0. A future release may support a fourth tone from timer 4.
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The MT-DB-U2 and MT-DB-U1 support 2 simultaneous tones using timers 1 and 0. Note that timer 0
has a lower accuracy for tone generation because it is 8-bit (timers 3 and 1 are 16-bit). Note also that
use of timer 0 temporarily disables the use of delay(), which will return to normal operation once the
tone stops playing. Thus, timer 0 is set with the lowest priority. For example, if generating DTMF tones
on the MT-DB-U4, timers 3 and 1 will be used. However, the MT-DB-U2 and MT-DB-U1 will both use
timer 0 for the second tone. If timer 0 is used, delay() should not be called while timer 0 is generating a
tone. Instead, use _delay_ms(), which is included with avr-libc.
The DTMF_Demo sketch demonstrates usage of Tone.cpp for DTMF generation.
Detailed Memory Usage Output After Compilation
In this release, two programs are run at the end of compilation to provide more detailed memory
usage. This is enabled only when verbose messages for compilation is enabled in the IDE
Preferences. Just above the normal flash usage message, is the output from the size utility. Above the
size utility output is the output from the nm utility. The values on the left are in bytes. The letters stand
for: T(t)=.text, D(d)=.data, B(b)=.bss, and everything else (ie: W) resides in flash (in most cases).
USB Technical otes
●Note that USB CDC is required for auto-reset into the bootloader to work (otherwise,
manually press reset with jumper installed).
ATmegaxxU4: 832 bytes DPRAM, 1 (control, 64 byte max) + 1 (two banks, 256 byte max) + 5 (two
banks, 64 byte max) endpoints AT90USBxxx6/7: 832 bytes DPRAM, 1 (control, 64 byte max) + 1 (two
banks, 256 byte max) + 5 (two banks, 64 byte max) endpoints
// These are used by the core
#define USB_CONTROL_EP_SIZE 16
#define USB_CONTROL_EP_BANKS 1
#define USB_DEFAULT_EP_SIZE 64
#define USB_DEFAULT_EP_BANKS 2
#define USB_CDC_NOTIFICATION_EP_SIZE 16
#define USB_CDC_NOTIFICATION_EP_BANKS 1
#define USB_CDC_DATA_EP_SIZE 64
#define USB_CDC_DATA_EP_BANKS 2
// These can optionally be used by PluggableUSB libraries
#define USB_HID_EP_SIZE 16
#define USB_HID_EP_BANKS 1
#define USB_MIDI_EP_SIZE 64
#define USB_MIDI_EP_BANKS 2
#define USB_MSD_EP_SIZE 64
#define USB_MSD_EP_BANKS 2
AT90USBxx2: 176 bytes DPRAM, 8 - 64 byte endpoints, 1 (control) + 2 (one bank) + 2 (two banks)
endpoints ATmegaxxU2: 176 bytes DPRAM, 8 - 64 byte endpoints, 1 (control) + 2 (one bank) + 2 (two
banks) endpoints
// These are used by the core
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