Ticket #16 (closed defect: fixed)
bluetooth pullup / pulldown resistors
| Reported by: | laforge@… | Owned by: | sean_chiang@… |
|---|---|---|---|
| Priority: | high | Milestone: | |
| Component: | Bluetooth | Version: | GTA01Bv2 |
| Severity: | blocker | Keywords: | |
| Cc: | buglog@… | Blocked By: | |
| Blocking: | Estimated Completion (week): | ||
| HasPatchForReview: | PatchReviewResult: | ||
| Reproducible: |
Description
I seem to be unable to get the Bluetooth USB device to show up at the
S3c2410 OHCI.
I have set BT_EN(GPB5) to 'high' level and configured the D1REG of the
PMU to 3.1 Volts. Even after manually causing a reset on the USB bus,
there is no
From looking at the schematics, it seems like there are by default no
pullup/pulldown resistors. The resistors are all marked as NC.
I think, much like with any USB device, we'll need at least the pullup
from D+ to +3.3V This should be connected to either BT_3V15 or to
BT_EN, since this way the software can cause a bus reset by switching
off either of them.
In the schematics, this seems to be R7705, where a 1.5kOhms resistor
should be used.
I'm also not sure whether we can live without the 15kOhms pulldown
resistors on D+ and D-, marked R7709 and R7710 in the schematics.
Since I don't yet have a component placement PDF for GTA01Bv2 (would you
_please_ always include this automatically with the schematics?), I
can't really tell whether they are indeed NC or actually present.
If you can tell me the locations, I'm confident I can connect matching
resistors - however, I don't have anything smaller than 0805 in stock
here, but I guess I will be able to fix it with some magnet wire or the
like.
Attachments
Change History
Changed 6 years ago by laforge@…
- Attachment GTA01 A2 Bluetooth Modification Notices.pdf added
PDF file with instructions on how to fix bluetooth usb