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9 Comments

  1. I don’t get it why people still use the AVR soft USB (like the USBasp does).
    It’s unreliable, especially in noisy environments, and it fails you when you need it the most.
    So why still use it when you can get $1 USB micros?

    1. When you’re using 49 of the 51 available i/o lines and don’t want to have to solder extra components like caps and crystals and take up i/o pins for dedicated USB on the chip, that’s when some people resort to low voltage programming over serial/uart! Why the programmer doesn’t use dedicated USB hardware, I don’t know (I didn’t realise that it doesn’t). I only program these game boards in a controlled environment so noise isn’t a problem.

  2. The 12mhz version of v-usb used with the USBasps seems to be the most reliable.
    There’s actually 5 different versions, so you can’t equate results with one version to all.

    Since when can you get an AVR with hardware USB for $1? And where???

  3. p.s.:
    hardware USB V-USB
    differential transmitter yes yes
    differential receiver yes no
    controlled impedance yes somewhat
    controlled slew rate yes no
    noise suppression yes no
    oversampling yes no
    USB compliance certification yes no

    Notice the difference?

  4. Sorry, layout was messed up.


    p.s.:
    hardware USB V-USB
    differential transmitter yes yes
    differential receiver yes no
    controlled impedance yes somewhat
    controlled slew rate yes no
    noise suppression yes no
    oversampling yes no
    USB compliance certification yes no

    Notice the difference?

  5. Yup, comment system isn’t working as of 15:55-ish UTC. I sent an Email to DP with my browser-shown error via the Contact Form, which does appear to be working at the moment.

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