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Related Manuals for MattairTech MT-DB-U2
Summary of Contents for MattairTech MT-DB-U2
- Page 1 Manual MTDBU2 October 29, 2015 http://www.mattairtech.com/...
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Page 2: Table Of Contents
MT-DB-U2 Manual Table of Contents Overview........................3 Introduction............................3 MTDBU2 Features.......................... 3 ATmega32U2 Features........................4 MTDBU2 Hardware.....................6 Layout / Header Pins......................... 6 Solder Jumpers..........................7 Pin Descriptions..........................8 PWM Filters............................9 Clock Source............................. 9 HWB Jumper / RESET button / LED....................9 ISP Header............................. 10 Power Configuration....................11 USB Bus Powered 5V........................11 USB Bus Powered – 3.3V....................... 11 Externally Powered – 4.0V to 5.5V....................12 Externally Powered – 3.0V to 3.6V....................12 USB Shield............................12 Arduino Compatibility....................13 Features............................13 Pin Mapping............................ 13 Installation............................ -
Page 3: Overview
MT-DB-U2 Manual Overview Overview Introduction The MTDBU2 is a development board for the Atmel ATmega32U2 USB microcontroller. The Atmega32U2 contains 32 KB of flash, 1 KB of RAM, 1 KB 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 insystem programming. This header can be reconfigured to allow the MTDBU2 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 ATmega32U2 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 onboard 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 panelmount USB connectors. The PCB is highquality with ENIG (goldplated) 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. MTDBU2 Features ATmega32U2 USB microcontroller ● 32KB FLASH, 1KB SRAM, 1KB EEPROM ● USB device controller, Serial USART, and SPI communications ● 2 timers with 5 PWM channels ● Arduino compatible ● CDC (Arduino/AVRDUDE) or DFU (FLIP) bootloader preinstalled ● Bitlash preinstalled (Arduino command shell) ● ISP header pads (program chip using external programmer) ● 16MHz crystal ● Green Status LED ●... -
Page 4: Atmega32U2 Features
MT-DB-U2 Manual ATmega32U2 Features High Performance, Low Power AVR 8Bit 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 Nonvolatile Program and Data Memories ● 32K Bytes of InSystem SelfProgrammable Flash 1024 Bytes EEPROM 1024 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 InSystem Programming by onchip Boot Program True ReadWhileWrite Operation Programming Lock for Software Security USB 2.0 Fullspeed Device with Interrupt on Transfer Completion ● Complies fully with Universal Serial Bus Specification REV 2.0 48 MHz PLL for Fullspeed 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 64bytes 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 ●... - Page 5 MT-DB-U2 Manual QFN32 (5x5mm) / TQFP32 packages Operating Voltages ● 2.7 – 5.5V Operating temperature ● Industrial (40 C to +85 C) Maximum Frequency ● 8 MHz at 2.7V Industrial range 16 MHz at 4.5V Industrial range October 29, 2015 http://www.mattairtech.com/...
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Page 6: Mtdbu2 Hardware
MT-DB-U2 Manual MTDBU2 Hardware MTDBU2 Hardware Layout / Header Pins October 29, 2015 http://www.mattairtech.com/... -
Page 7: Solder Jumpers
MT-DB-U2 Manual Solder Jumpers October 29, 2015 http://www.mattairtech.com/... -
Page 8: Pin Descriptions
MT-DB-U2 Manual Pin Descriptions Description Ground 5V, Vbus 5V output from USB Vbus. Vbus pin and 5V pin are tied together. 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). 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). 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 powerup. 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 shortcircuit protection in case the pin is used as an output and the jumper is installed. 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. -
Page 9: Pwm Filters
MT-DB-U2 Manual D+, D USB data pins. Can be used for panelmount 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: =1/2 RC =1/2 1K∗100nF=1/2 0.0001=1600Hz This is a firstorder lowpass filter that can output levels from 0V to Vcc. All three filter inputs are connected to the 16bit 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 Atmega32U2. 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 powerup. Note that the hardware HWB function of the ATmega32U2 is disabled. That is, the HWBE fuse is disabled. The bootloader startup code is always run after reset or powerup (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 ... -
Page 10: Isp Header
MT-DB-U2 Manual Jumper Mode Driver User Program CDC (COM port) (optional) 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 dfuprogrammer to jump to the application. Then, when running the application, the reset button can be pressed to reenter 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 MTDBU2 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 MTDBU2 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. October 29, 2015... -
Page 11: Power Configuration
MT-DB-U2 Manual Power Configuration Power Configuration The MTDBU2 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 recompiled 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 3.3V Vcc 5V UVcc = Vcc Externally powered – 4.0 to 5.5V Vcc Enable 16 MHz Externally powered – 3.0 to 3.6V Vcc 3.3V = Vcc 5V UVcc = Vcc Disable 8 MHz WARNING Care must be taken when configuring the solder jumpers. -
Page 12: Externally Powered - 4.0V To 5.5V
MT-DB-U2 Manual 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. October 29, 2015 http://www.mattairtech.com/... -
Page 13: Arduino Compatibility
MT-DB-U2 Manual Arduino Compatibility Arduino Compatibility Features Arduino core and libraries ported to MattairTech USB boards ● MTDBU2: 21 digital, 4 PWM, 8 INT, 13 PCINT, SPI, USART1, 32KB FLASH, 1KB SRAM, ● 1KB EEPROM USB Serial interface replaces USART0 ● Hardware maximum speed of 8Mbps (U4/U6) or 2Mbps (U1/U2) ● Can use terminal emulator or serial monitor ● Uses the same methods as the original HardwareSerial.cpp (ie: Serial.println("Hello!")) ● Based on LUFA USB library by Dean Camera (www.fourwalledcubicle.com) ● USART1 also available; can be used at the same time ● Arduino/AVRDUDE compatible CDC bootloader preinstalled on all boards ● Bitlash Arduino command interpreter (bitlash.net) preinstalled on U2, U4, and U6 boards ● All libraries included with Arduino download are now supported ● Bootloader jumps to sketch after upload, reset button or autoreset returns to bootloader ● HID keyboard and mouse support ● Pin Mapping October 29, 2015 http://www.mattairtech.com/... -
Page 14: Installation
MT-DB-U2 Manual Installation It is recommended to install this separately from existing Arduino 1.x installations. Download and install Arduino version 1.0.5 or higher from http://arduino.cc/en/Main/Software 2. Download the MattairTech_Arduino_1.0.5.zip file from http://www.mattairtech.com/ (see product page). Unzip this file into your arduino user directory (ie: My Documents/Arduino). You may need to create this folder. Do not unzip into the arduino system directory from step 1. If you installed a previous version of the MattairTech Arduino port, move or remove it. It is OK if there are other cores, libraries, or sketches already present. 3. Download and install WinAVR version 20100110 from http://sourceforge.net/projects/winavr/files/WinAVR/20100110/ 4. Rename the <arduino system directory>/hardware/tools/avr folder to avr_old. Copy the WinAVR20100110 folder to <arduino system directory>/hardware/tools. Rename the copied WinAVR20100110 folder to avr. 5. Create the directory <arduino system directory>/hardware/tools/avr/etc. Then, copy the file <arduino user directory>/hardware/MattairTech/install/avrdude.conf to <arduino system directory>/hardware/tools/avr/etc. 6. Replace the file <arduino system directory>/hardware/tools/avr/bin/avrdude.exe with <arduino system directory>/hardware/tools/avr_old/bin/avrdude.exe 7. Replace the file <arduino system directory>/hardware/tools/avr/avr/include/avr/power.h with <arduino user directory>/hardware/MattairTech/install/power.h 8. Now, plug in the board with the jumper installed so that the bootloader runs. Point the driver installer to the directory <arduino user directory>/hardware/MattairTech/install to install MattairTech_CDC.inf. This same driver is also used for the USB serial interface (if used). Using Arduino Because of the similarities with the Arduino Leonardo, please read http://arduino.cc/en/Guide/ArduinoLeonardo first. Within the Arduino IDE, select the appropriate MattairTech board and COM port. There are 2 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. When using the USB serial interface, it is no longer necessary to include the LUFA USB library header file. Then, with the bootloader running, compile and upload your sketch. Note that when using a terminal ... -
Page 15: Using Libraries
MT-DB-U2 Manual D2, D3, etc. These are Arduino digital pins, not to be confused with port D pins. MattairTech boards are printed with both port pin names as well as sequential numbers indicating Arduino digital/analog pins (0 means D0 or A0, 10 means D10 or A10, etc). Using Libraries There are several libraries included with Arduino. Some of these needed simple changes to work with MattairTech boards. If a library was ported, it is included in the MattairTech download and installed in the Arduino user directory with "_MattairTech_Port" appended to the name of the original directory name. This can be seen in the Arduino IDE in File>Sketchbook>libraries and File >Examples. If you see the Files>Examples version of a particular library then you must use it instead of the original library which will still be shown lower on the menu. If there is no Files>Examples version, then you can use the original, which did not require porting. If there is a library you would like to use that is not included with Arduino, email support and I should be able to quickly support it. Often, only pin mappings need to be changed. The I2cMaster library contains a software I2C library that can be used with the MTDBU1 and MTDBU2, which do not contain I2C hardware. USB Serial interface The LUFA directory contains a reorganized subset of the LUFA USB library by Dean Camera (fourwalledcubicle.com). It implements a CDC class device, which appears as a COM port on the host computer. A terminal emulator or the Arduino serial monitor can be used to communicate with the board. Use this interface the same way you would on a standard Arduino (ie: Serial.println()). The interface is nearly the same as the one in HardwareSerial.cpp. For example: void setup() { Serial.begin(9600); // The default settings for USB options are used (all enabled) pinMode(2, INPUT); void loop() { int sensorValue = digitalRead(2);... - Page 16 MT-DB-U2 Manual whenconnected) as well as blink when data is transferred. Otherwise, the LED will be left on and you can manually control it. The default setting is USB_LED_ENABLED. USB_AUTOFLUSH_ENABLED, USB_AUTOFLUSH_DISABLED If USB_AUTOFLUSH_ENABLED is set, the upstream buffer (to the PC) will be flushed at periodic intervals. The hardware USB DPRAM is used for the RX and TX buffers. There are actually two buffers per direction in a pingpong configuration. As one buffer fills up, it is swapped with the other, allowing the USB hardware to read from the filled one, and the user to write to the empty one. Any number of characters can be sent to the upstream buffer without any need to manage it, but it must be flushed at the end of the transmission if USB_AUTOFLUSH_ENABLED is not set. In this case, use Serial.flush(). The default setting is USB_AUTOFLUSH_ENABLED. USB_WAITFORCONNECT_DISABLED, USB_WAITFORCONNECT_ENABLED If USB_WAITFORCONNECT_ENABLED is set, Serial.begin() will wait for the host to open a connection before returning. That is, a program like a terminal emulator or serial monitor must connect to the COM port before continuing. This is different than the USB CDC connection. This is useful to prevent the board from sending data before the host is ready, and is required in many cases for microcontrollers with onboard USB (ie: Leonardo). The wait is performed using: while(!Serial); The default setting is USB_WAITFORCONNECT_DISABLED. USB_AUTORESET_ENABLED, USB_AUTORESET_DISABLED If USB_AUTORESET_ENABLED is set, the bootloader will be invoked automatically by the Arduino IDE. If USB_AUTORESET_DISABLED is set, a manual reset will be required to enter the bootloader. Note that the HWB jumper must be installed for the bootloader to be invoked, regardless of method. The only exception is when there is no sketch yet installed. With the jumper removed, the sketch (if present) will always run. There is no delay. The default setting is USB_AUTORESET_ENABLED. Updated Tone.cpp Tone.cpp now supports multiple simultaneous tone generation (one tone per timer). The MTDBU6 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 MTDBU4 currently supports up to 3 simultaneous tones using timers 3, 1, and 0. A future release may support a fourth tone from timer 4. The MTDBU2 and MTDBU1 support 2 simultaneous tones using timers 1 and 0. Note that timer 0 has a lower accuracy for tone generation because it is 8bit (timers 3 and 1 are 16bit). Note also that use of timer 0 temporarily disables the use of delay(), USB autoflushing, and proper USB LED handling, all of 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 MTDBU4, timers 3 and 1 will be used. However, the MTDBU2 and MTDBU1 will both use timer 0 for the second tone. October 29, 2015...
- Page 17 MT-DB-U2 Manual 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 avrlibc. If sending data to the USB host (ie: using Serial.print()) before or during timer 0 tone generation, then it must be manually flushed with Serial.flush() prior to calling tone() and after any subsequent printing during tone generation. Otherwise, some data may not be sent until the tone stops and autoflushing returns to normal operation. The USB LED handling (if enabled) will also be disrupted during timer 0 tone generation. During this time, the LED will not be able to change state. If USB traffic occurs, the blink will be delayed until tone generation stops. The DTMF_Demo sketch demonstrates usage of Tone.cpp for DTMF generation on the MTDBU4 October 29, 2015 http://www.mattairtech.com/...
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Page 18: Cdc Bootloader (Arduino/Avrdude)
MT-DB-U2 Manual CDC Bootloader (Arduino/AVRDUDE) CDC Bootloader (Arduino/AVRDUDE) CDC Serial Driver The CDC Serial driver allows the board to appear as a COM port. The driver itself is included with Windows, but an .inf file is needed to configure it. Download the .inf file from https://www.mattairtech.com/software/MattairTech_CDC_Driver_Signed.zip . Note that Windows Vista 64bit, Windows 7 64bit and Windows 8 require the signed driver. You may need to rename the file so that it has the inf extension. Next, plug in the board with the jumper removed. Windows will then prompt you for the MattairTech CDC Serial driver. Point the installer to the directory where you downloaded the driver and install, ignoring any warnings. Once the driver is loaded, the device will appear as the MattairTech CDC Serial device using a COM port in the device manager. If you wish, doubleclick on the CDC Serial device entry in the device manager to configure the driver. Nothing on the port settings tab needs to be changed. We are using a virtual COM port so the settings are ignored. The baud rate will always be as fast as possible. On the advanced tab, you can adjust the FIFO buffer sizes. If you experience any buffering problems (ie: a delayed response to user input), then change both buffer sizes to 1. CDC Bootloader The CDC bootloader uses the AVR109 protocol, and can be used withing the Arduino environment, or directly with AVRDUDE. Version 130410 or above is required to support the auto reset feature (note that several boards that were shipped before 130626 still have the old bootloader). If using a terminal emulator, you must first disconnect before running the bootloader. The bootloader enters programming mode only if the jumper is installed, even when using Arduino autoreset. The one exception is when the FLASH is empty. Even with the jumper installed, programming mode will NOT be entered if the reset was from the watchdog timer. The one exception to this is when the boot key is enabled and the key matches. The key will match when the Arduino IDE autoresets the board to enter bootloader programming mode. The key is needed because the Arduino core part of the firmware, which listens for the IDE autoreset signal, uses a watchdog reset to enter the bootloader. This way, the user application can make use of the watchdog timer. The bootloader will jump to the user application at the end of FLASH programming. Other operations with AVRDUDE, like writing the EEPROM, will not trigger this. Just press reset to get back to the bootloader (as long as the jumper is installed). October 29, 2015 http://www.mattairtech.com/... - Page 19 MT-DB-U2 Manual The default CDC bootloader has the following compiletime options defined: #define ENABLE_LED_BOOT #define ENABLE_LED_APPLICATION #define DISABLE_JTAG_APPLICATION #define ENABLE_CLKDIV_1_APPLICATION #define ENABLE_BOOT_KEY #define ENABLE_RESET_AFTER_PROGRAMMING #define NO_LOCK_BYTE_WRITE_SUPPORT An alternate version with the above options undefined is available on the website named Bootloader_no_options.hex. Use it if the default options interfere with your application. For example, you may disconnect the LED and use the pin as an analog input. When using the autoreset feature of Arduino, the boards.txt file must currently list the bootloader directory as caterina (the bootloader used on the Leonardo). The actual bootloader is a modified version of the LUFA CDC bootloader by Dean Camera (lufalib.org). It resides in the mtdbxx folder (where xx corresponds to the board you have). So, if you wish to use the Arduino IDE to burn the bootloader, you must temporarily change the appropriate entry in the boards.txt file to point toward the actual bootloader directory. Change it back to caterina when finished to reenable autoreset. Example for Windows: avrdude -p m32u4 -c avr109 -P COM5 -U flash:w:"bitlashdemo_MT-DB-U4.hex" Example for Linux: avrdude -p m32u4 -c avr109 -P /dev/ttyACM0 -U flash:w:"bitlashdemo_MT-DB-U4.hex" Arduino environment: Be sure to select the COM port. Then upload your sketch with the Upload button.
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Page 20: Dfu Bootloader (Flip/Dfuprogrammer)
MT-DB-U2 Manual DFU Bootloader (FLIP/dfuprogrammer) DFU Bootloader (FLIP/dfuprogrammer) Installation FLIP is a graphical utility used to load firmware into the ATmega32U2. FLIP includes the DFU bootloader driver. It supports Windows XP through Windows 7 (32 or 64 bit). Download FLIP 3.4.2 or higher from http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3886 and install. Once FLIP is installed, the DFU bootloader drivers can be loaded. Install the HWB jumper and powerup the board (or press reset). This will enter the DFU bootloader. The LED should be pulsing. Windows will then prompt you for the ATmega32U2 driver. By default, this is located in the Program Files/Atmel/Flip 3.4.2/usb directory. Point the installer to that directory and install. Once the driver is loaded, the device will appear as the ATmega32U2 device under Atmel USB Devices in the device manager. October 29, 2015 http://www.mattairtech.com/... -
Page 21: Flip
MT-DB-U2 Manual FLIP Install the HWB jumper and powerup the board (or press reset). This will enter the DFU bootloader. The LED should be pulsing. Now launch the FLIP utility. When it has loaded, click on the chip icon and select the Atmega32U2. October 29, 2015 http://www.mattairtech.com/... - Page 22 MT-DB-U2 Manual Next, click on the USB icon, select USB, then connect. The screen should now show information about the ATmega32U2. Click on the File menu, and open the appropriate hex file. More information will appear about the program. Be sure that erase is checked. The firmware cannot be loaded unless the flash is erased first. Program must be checked. Verify should also be checked. Now click on the Run button in the lowerleft of the screen, and the firmware will be quickly loaded onto the ATmega32U2. You may also program the EEPROM. If so, click on Select EEPROM at the bottom. Then, click on the File menu and open the appropriate eep file. You will have to change the file filter to allow you to see the eep file. Note that eep files are just hex files but with the eep extension instead of hex. More information will appear about the file when selected. Both Program and Verify should be checked. Click run to program the EEPROM. You can run your application without removing the jumper or pressing reset by unchecking the reset box and pressing the “Start Application” button (lower right). October 29, 2015 http://www.mattairtech.com/...
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Page 23: Dfuprogrammer
MT-DB-U2 Manual dfuprogrammer dfuprogrammer is a command line utility used to program the ATmega32U2 that runs under Linux. A DFU driver installation is not required. Download version 0.5.4 or higher from http://dfu programmer.sourceforge.net/ . The following commands can be used: dfuprogrammer atmega32u2 erase dfuprogrammer atmega32u2 flasheeprom YourHex.eep (if applicable) dfuprogrammer atmega32u2 flash YourHex.hex dfuprogrammer atmega32u2 start (to jump to application section without reset) October 29, 2015 http://www.mattairtech.com/... -
Page 24: Running Bitlash Demo
MT-DB-U2 Manual Running Bitlash Demo Running Bitlash Demo Bitlash Bitlash is an open source interpreted language shell and embedded programming environment. The preinstalled Bitlash demo was compiled in the Arduino environment and supports Arduino functions (ie: dw() for digitalWrite()). A terminal emulator (recommended) or the Arduino serial monitor may be used. See the CDC Bootloader section for details on installing the CDC Serial driver. The following example saves three functions to EEPROM. It is then run in the background, pulsing the LED using analog write (PWM): bitlash here! v2.0RC4 (c)2011 Bill Roy, bitlash.net -type HELP- 1706 bytes free > print free, " bytes free" 1702 bytes free > pinMode(13,1) > d13=1 > x=255;d=0; > function brighter {if (x==255) {d=0;} else { a13=++x; snooze(2);}} saved >... - Page 25 MT-DB-U2 Manual Old Demo Program The old demo program makes use the use of the MTDBU2 as a CDC device (virtual COM port). This is one of the most common ways to connect to a PC over USB. It uses Dean Camera's opensource LUFA USB library available at http://www.fourwalledcubicle.com/. The LUFA download includes many examples that can be easily compiled for the ATmega32U2. See the CDC Bootloader section for details on installing the CDC Serial driver. The old demo requires an ANSI terminal to allow drawing of the menu system. If you see garbage on the terminal screen, click on the configuration icon and change the emulation to ANSI (or ANSIW). After connecting, a message that reads “Press any Key” is printed periodically. If you do not see this message, just press any key to continue. October 29, 2015 http://www.mattairtech.com/...
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Page 26: Schematic
MT-DB-U2 Manual Schematic Schematic October 29, 2015 http://www.mattairtech.com/... -
Page 27: Troubleshooting / Faq
MT-DB-U2 Manual Troubleshooting / FAQ Troubleshooting / FAQ Nothing yet Support Information Support Information Please check the MattairTech website (http://www.MattairTech.com/) for firmware and software updates. Email me if you have any feature requests, suggestions, or if you have found a bug. If you need support, please contact me (email is best). You can also find support information at the MattairTech website. A support forum is planned. Support for AVRs in general can be found at AVRfreaks (http://www.avrfreaks.net/). There, I monitor the forums section as the user physicist. Justin Mattair MattairTech LLC PO Box 1079 Heppner, OR 97836 USA 541-626-1531 justin@mattair.net http://www.mattairtech.com/ Acknowledgments Acknowledgments Thanks to Dean Camera (http://www.fourwalledcubicle.com/) for his excellent LUFA library and bootloaders. Thanks to the members of AVRfreaks (http://www.avrfreaks.net/) for their support. Finally, thanks to Atmel for creating a great product, the AVR microcontroller. October 29, 2015 http://www.mattairtech.com/... -
Page 28: Legal
Further, the user indemnifies MattairTech LLC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge and any other technical or legal concerns. -
Page 29: Appendix A: Precautions
When using the microcontrollers internal regulator to power itself, be sure not to exceed the regulator maximum current output. CAUTION The MT-DB-U2 contains static sensitive components. Use the usual ESD procedures when handling. CAUTION Improper fuse settings may result in an unusable AVR. Be certain... -
Page 30: Appendix B: Other Mattairtech Products
MT-DB-U2 Manual Appendix B: Other MattairTech Products Appendix B: Other MattairTech Products ZeptoProg II AVRISP mkII Programmer ● AVRISPmkII compatible AVR Programmer ● Supports all AVRs with ISP, PDI, or TPI ● Optional 5V output via headers to target board, with ● standard jumper and PTC fuse 4channel Logic Analyzer ● Serial bridge / pattern generator / SPI interface ● GPIO / PWM / frequency input & output ● Atmel Studio / AVRDUDE support ● Target board voltage of 2V to 5.5V via levelshifted ● pins on two main headers MTDBU6 USB AVR development board ● AT90USB646 / AT90USB1286 USB AVR ● 64KB/128KB FLASH, 4KB/8KB SRAM ● 5V, 500mA LDO regulator (3V30V input) ● Auto power source selection IC (USB/External) ● 16MHz and 32.768KHz crystals ● Arduino compatible ● CDC or DFU bootloader ●...
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