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On Mon, 7 Aug 2017 17:53:35 +0200 |
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tuxic@××××××.de wrote: |
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|
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> On 08/07 11:21, Stefan Mark wrote: |
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> > On Sun, 6 Aug 2017 18:50:07 +0200 |
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> > tuxic@××××××.de wrote: |
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> > |
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> > > Hi, |
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> > > |
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> > > sorry, this will become a little longish... |
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> > > |
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> > > Background: To program an ATMEL ATtiny85 via USB |
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> > > without a dedicated USB chip there is a bootloader |
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> > > called "micornucleys", which bitbangs the USB protocoll. |
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> > > This mechanism is used in Digistupms Digispark ATTtiny |
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> > > developmnent board (http://digistump.com/products/1). |
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> > > |
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> > > So far so ....nice? |
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> > > |
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> > > When I plug in such a little board into my PC, demesg |
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> > > reports: |
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> > > [ 1429.834140] usb 7-4: new low-speed USB device number 15 using |
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> > > ohci-pci [ 1429.965142] usb 7-4: device descriptor read/64, error |
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> > > -62 [ 1430.203151] usb 7-4: device descriptor read/64, error -62 |
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> > > [ 1430.438161] usb 7-4: new low-speed USB device number 16 using |
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> > > ohci-pci [ 1430.569151] usb 7-4: device descriptor read/64, error |
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> > > -62 [ 1430.803174] usb 7-4: device descriptor read/64, error -62 |
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> > > [ 1431.038184] usb 7-4: new low-speed USB device number 17 using |
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> > > ohci-pci [ 1431.456157] usb 7-4: device not accepting address 17, |
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> > > error -62 [ 1431.582204] usb 7-4: new low-speed USB device number |
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> > > 18 using ohci-pci [ 1432.000209] usb 7-4: device not accepting |
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> > > address 18, error -62 [ 1432.000244] usb usb7-port4: unable to |
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> > > enumerate USB device |
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> > > |
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> > > or similiar. lsusb does not show anything related at all. |
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> > > |
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> > That usually happens when the improvised USB is not good enough. |
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> > Try a different port, maybe put a USB Hub between. Check if the |
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> > resistors and diodes for the level shifting are the right ones |
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> > (measure the resistors, especially if you are not using 5% types). |
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> > If that does not work, try a different diode/resistor combination |
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> > (For example, usbasp uses 5v6 zener and 68/2k2 resistor, littlewire |
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> > 3v6 zener and 27/1k2 resistor. I have seen others too. I had at |
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> > least one which never worked with my laptop). |
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> |
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> The board is THAT tiny (http://digistump.com/products/1) that even |
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> a single proble will short circuit one half of the board... :) |
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Yeah, i know them. You need a smaller probe ;) |
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But i can understand that, i would not like to change parts on those. |
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Then better try other Ports :) |
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