Pro Micro C
Patrizia Leones
It is the only SI prefix which uses a character not from the Latin alphabet. In Unicode, the symbol is represented by .mw-parser-output .monospacedfont-family:monospace,monospaceU+03BC μ GREEK SMALL LETTER MU or the legacy symbol U+00B5 MICRO SIGN. The prefix "mc" is commonly used in healthcare or when the character "μ" is not available; for example, "mcg" commonly denotes a microgram.[2] The letter "u" is sometimes used instead of "μ" when non-Latin characters are not available.
In circumstances in which only the Latin alphabet is available, ISO 2955 (since 1974,[9] withdrawn 2001[10]), DIN 66030 (since 1980[11][12]) and BS 6430 (since 1983) allow the prefix μ to be substituted by the letter u (or even U, if lowercase letters are not available), as, for example, in um for μm, or uF for μF, or in the common abbreviation UC for microcontroller (μC).Similarly, capacitor values according to the RKM code defined in IEC 60062 (since 1952) can be written as 4u7 (or 4U7) instead of 4μ7 if the Greek letter μ is not available.
The Micro is a microcontroller board based on the ATmega32U4, developed in conjunction with Adafruit. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a micro USB cable to get started. It has a form factor that enables it to be easily placed on a breadboard. The Micro board is similar to the Arduino Leonardo in that the ATmega32U4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Micro to appear to a connected computer as a mouse and keyboard, in addition to a virtual (CDC) serial / COM port.
The IEEE/ACM International Symposium on Microarchitecture is the premier forum for presenting, discussing, and debating innovative microarchitecture ideas and techniques for advanced computing and communication systems. This symposium brings together researchers in fields related to microarchitecture, compilers, chips, and systems for technical exchange on traditional microarchitecture topics and emerging research areas. The MICRO community has enjoyed a close interaction between academic researchers and industrial designers, and we aim to continue this tradition at MICRO-54. In 2021, MICRO will be held as a global online event, broadcast from the host city of Athens, Greece.
Thank you for attending this year's MICRO symposium: while we were sad that we could not all convene in Athens, this year's online format was highly successful and drew attendees from all over the world! We hope that all attendees enjoyed the experience.
Keynotes recordings and slides are available in the program, as are recordings of released workshops and tutorials. Paper presentations, and recordings of the live Q&A sessions will be available on Whova for registered attendees through the end of December, with paper presentations posted publicly afterward. We invite you to check out the MICRO 2021 GatherTown space for a virtual mini-excursion of Athens and Greece.
The organizing and steering committees of MICRO-54, along with the technical sponsors ACM and IEEE, have considered the current state of the pandemic and the uncertainties around the globe. Based on this, this year's MICRO will be held as a fully online global event, with the broadcast being managed from the city of Athens. The main symposium will take place from Tuesday, October 19 to Thursday, October 21, while workshops and tutorials will be held on Monday, October 18 and Friday, October 22. Stay tuned for news and updates about an exciting technical week with inspiring keynotes, breaking research results in the symposium papers, and a diverse set of workshops and tutorials on hot topics in computing.
We invite undergraduate and graduate students to participate in the ACM Student Research Competition (SRC)! Sponsored by Microsoft, the SRC is a forum for both undergrad and grad students to share their research results. The SRC at MICRO 2021 consists of two rounds: a poster session and a presentation session. Top winners will receive monetary prizes, and first-place winners will be invited to participate in the SRC Grand Finals. If you are interested in submitting to the SRC, please view the submission guidelines and instructions. The deadline to enter the SRC has been extended to July 29, 2021, so enter soon!
This year, MICRO 2021 is offering artifact evaluations. After MICRO decisions are released, all accepted papers will be given the option of submitting their artifacts for review, and authors will be given the option to release their artifacts and add a two-page appendix to camera-ready papers describing the artifacts. The process is being led by evaluation co-chairs Samira Khan (University of Virginia) and Gennady Pekhimenko (University of Toronto), and is modeled after the successful artifact evaluations done at this year's ASPLOS conference. Check out the artifact evaluation page for more information on the optional process, and its many benefits!
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Here at SparkFun, we refuse to leave 'good enough' alone. That's why we're adding to our line-up of Arduino-compatible microcontrollers once more! The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on-board and do away with bulky external USB interface.
This tiny little board does all of the neat-o Arduino tricks that you're familiar with: 9 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 16MHz and 5V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere. There is a voltage regulator on board so it can accept voltage up to 12VDC. If you're supplying unregulated power to the board, be sure to connect to the "RAW" pin on not VCC.
This latest revision corrects the silk error from the last version of the board so that pin 14 is correctly labeled. We've also added a PTC fuse and diode protection to the power circuit and corrected the RX and TX LED circuit.
By connecting to the FioV3 at a baud rate of 1200 and closing the COM port, this will initiate a software reset with the Atmega32U4 just like the Arduino Leonardo (as stated in the Automatic (Software) Reset and Bootloader Initiation for a Leonardo => ) .
Interrupts Atmega32u4's built in CDC driver for USB communication can have timing issues when messing with the watchdog timer, sleep modes, and timer interrupts. I am unsure of how to fix this issue if you continue to use code that interferes with the CDC. I recommend trying a different method than using the interrupt timers.
Wrong Bootloader It's possible to brick your Pro Micro 5V/16MHz if you used the wrong board selection with the wrong frequency. If you upload the wrong frequency, the IC will not be able to understand any new code that is being uploaded. It expects to have code that is compiled for another bootloader, instead of using the 16MHz frequency with the oscillator.
When either of these cases happens, the device manager is not able to recognize the device and is usually seen as an "unknown device" when the microcontroller runs the sketch. There are ways to recover the an Atmega32U4 (i.e. LilyPad Arduino USB - Atmega32U4 board, FioV3 - Atmega32U4, Pro Micro 5V/16Mhz, Pro Micro - 3.3V/8Mhz, etc) if this happens. Check below for more information:
You can try the double reset method by tapping the RST pin to GND twice (since there is no reset button on the board) as explained in the Troubleshooting sections labeled as Reset to Bootloader and How to Revive a "Bricked" Pro Micro => -micro--fio-v3-hookup-guide/troubleshooting-and-faq.
6.) Re-open the Tools>Port menu to view the list of COM ports again to see what the Pro Micro enumerates to when its in its bootloader. There is an 8 second window to view the COM port when the board is in bootloader mode.
After selecting the correct board definition and timing the double reset method correctly, I was able to upload successfully. It took me a couple of tries before I could get this right because of the timing. You should not need to go through this recovery procedure for subsequent uploads unless you brick the Atmega32U4 again.
You will need to connect to the same pins to your target device (i.e. LilyPad Arduino - USB, Pro Micro, Fio V3, Makey Makey, or Leonardo). On the Leonardo you can connect it just like the Uno. The LilyPad Arduino - USB has small ICSP pins. I managed to solder wires directly to the pins for access. The Pro Micro does not have an ISP header and the pin numbers are different. Check the tutorial for location of the pins on the programmer. Here are the pins for the Pro Micro Board:
3.) ProgramUsing Arduino v1.6+ go under Tools and select the correct programmer (if your programmer uses a COM port select that too), and the correct board (LilyPad Arduino - USB, Pro Micro, FioV3, Makey Makey, or Leonardo). Then select Burn Bootloader. For the Pro Micro, this will use the bootloader in the addon file, so make sure you have the correct addon file installed. You can find the latest board definitions from the SparkFun GitHub Repository [ _Boards ].
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