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| | |-+  How is a USB connection detected on H300?
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Author Topic: How is a USB connection detected on H300?  (Read 1107 times)

Offline W. Irving

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How is a USB connection detected on H300?
« on: February 26, 2007, 11:28:33 AM »
I have a half dead H340 (a more detailed topic is available at Misticriver) which thinks it's perpetually connected via USB, both in rockbox USB bootloader mode, and stock firmware.
My question, how does the software know there is a USB cable connected? Does it receive a signal from the USB controller?
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Offline LinusN

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Re: How is a USB connection detected on H300?
« Reply #1 on: February 26, 2007, 01:36:22 PM »
The 5V on the USB port is (via a transistor and a few resistors) connected to the GPIO39 pin on the CPU. If the CPU thinks that USB is connected all the time, either the input port is broken, or the transistor.
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Archos Jukebox 6000, Recorder, FM Recorder/iAudio X5/iriver H1x0, H3x0/Toshiba Gigabeat F20/iPod G5, G5.5

Offline W. Irving

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Re: How is a USB connection detected on H300?
« Reply #2 on: February 26, 2007, 01:39:03 PM »
Then I suppose ~something~  :-[ happened to the transistor that has made it constantly conduct. Tack!
« Last Edit: February 26, 2007, 01:41:04 PM by W. Irving »
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