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Bitsy doesn't work with some USB client devices

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akidder

1519 Posts

Posted - 25 Jul 2002 : 18:14:00

Q: I'm having trouble getting my Bitsy to work with USB client devices.

We've identified an issue with the Bitsy USB that prevents it from successfully connecting to some downstream(client)12Mbps USB devices; some mice and keyboards fall into this category. The problem can be fixed by ADS with a resistor change on the board.

To determine if your system requires rework...
1. Locate the configuration number for your system.
It's an 11-digit number beginning with "900". The number is printed on a sticker on the underside of the Bitsy. Consult the list below to determine if your system will require rework (ambiguity in some cases is because this rework is recorded in the bill of material number, which increments independently from the configuration number):

Bitsy CE with CF (900111-1100x): D5 and earlier will need rework; D7 and later will not; D6 systems should refer to #2, below.
Bitsy Linux with CF (900111-1400x): A1 will need rework; A3 and later will not; A2 should refer to #2.
Bitsy Linux with Ethernet (900111-1401x): All are revisions are ok (no rework necessary).
Bitsy Plus (board rev 170114-1000x): Rev 2 boards need this rework, later ones do not.

2. If necessary, locate and examine the value of R89
Resistor R89 is located on the underside of the Bitsy as shown in the following diagram:

The correct resistor should read "100". You can also test across the resistor with a digital multimeter on a low-impedance setting. The correct resistance should be 10 ohms.

If your system requires rework...
If your system does not have a 10 ohm resistor for R89, you can choose to do the rework yourself or return the systems to ADS for rework:
1. For organizations that have SMT rework stations, ADS can send replacement resistors for R89. (Important: Do not create a direct short across R89.)
2. Otherwise, contact ADS Support (support.us@eurotech.com) to return the Bitsy for repair at your convenience.

-----------------------
Drew Kidder
ADS Technology Transfer

Edited by akidder 8-Nov-2002: Add details for Bitsy Plus and Linux Bitsy configurations.

anatolyk

9 Posts

Posted - 27 Feb 2003 : 15:50:53

Q:
Bitsy Plus comes with 2 USB ports: Host and Function. Does ADS or a third party support serial drivers for these ports? I.e. drivers that implement virtual serial ports on top USB ports. They are sometimes called USB Serial Host Driver and USB function controller driver.

akidder

1519 Posts

Posted - 28 Feb 2003 : 15:15:15

This question was also posted at topic 815 and is being answered there.

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