lion mclionhead has updated the log for Silly hardware wishlist.J liked Programmable Precision Resistor.osantana has added Diagnostic Overlay for W65C02 Breadboard to hack.I Alone Possess The Truth on A Quarter Century Of The IMac.PEBKAC on China May Have A New Submarine Tracking Technology.Chad Steele on Data Recovery In The Woodshed.PEBKAC on Litter Box Sensor Lets You Know Exactly What The Cat’s Been Up To.rclark on Smart Doorbell Focuses On Privacy.limroh on Data Recovery In The Woodshed.12AU76L6GC on The Dipole Antenna Isn’t As Simple As It Appears.Esot.eric on A Quarter Century Of The IMac.Andy Marshall on Cooling Off The Bus Stop.Keebin’ With Kristina: The One With The QWERTY Drum Set 1 Comment Posted in Arduino Hacks Tagged Arduino DUE, Arduino Uno, USB serial, wireshark Post navigation We are curious why the packets contain four characters in ’s ATmega Wireshark captures - why not 1, 2, or 10? Is this something that can be controlled by the programmer, or is it fixed by the protocol and/or the FTDI chip? If you have the answer, let us know in the comments below. On any serial connection between two computers, when a virtual USB device is used on both sides of the link (no actual serial signals involved), the serial baud rate is a fictional thing - data transfer speeds depends on USB alone. This concept doesn’t apply only to Arduino boards, of course. On the Arduino Due, the USB connects directly to the SAM3X8E processor. For instance, on the Nano there is an FT232RL between the USB connector and the microprocessor (on an Arduino Uno board, a small ATMEGA8U2 is used instead of an FTDI chip, but the concept is the same). While the Arduino family of boards connect to your computer using a USB virtual serial port, the ATmega ones have an actual serial connection on-board. If you look under the hood, the answer is hiding in plain sight. He sets up an experiment with a simple sketch on both boards and uses Wireshark to evaluate the results.ĭata is sent in the USB packets in groups of four characters on the ATmega-based boards, but the entire string is put in a packet on the Due board. Wonders why the SerialUSB() function on the Cortex M3-based Arduino Due is so much faster than Serial() on the Uno or Nano, and shares his observations in this short video.
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