Difference between revisions of "PACmate20 Braille Display"
From Hackstrich
(Adding USB descriptor info.) |
(Added detailed information on USB descriptor info.) |
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| − | == USB Descriptors == | + | === USB Descriptors === |
<pre> | <pre> | ||
Configuration descriptor: | Configuration descriptor: | ||
Total length: 0020 | Total length: 0020 | ||
| − | + | Number of Interfaces: 01 | |
| − | + | Configuration value: 01 | |
| − | + | Configuration string: 00 | |
| − | + | Attributes: 80 [Device doesn't have own power, can't generate remote wakeups] | |
| − | + | Maximum power usage FA [500mA] | |
Interface descriptor: | Interface descriptor: | ||
| − | + | Interface number: 00 | |
| − | + | Alternate: 00 | |
Endpoints: 02 | Endpoints: 02 | ||
| − | Class: FF | + | Class: FF [Vendor Specific] |
| − | Subclass: 00 | + | Subclass: 00 [Ignored: Class FF] |
| − | Protocol: 00 | + | Protocol: 00 [Ignored: Class FF] |
| − | + | Interface string: 00 | |
Endpoint descriptor: | Endpoint descriptor: | ||
| − | Endpoint address: 01 | + | Endpoint address: 01 [10000000: OUT endpoint 1] |
| − | + | Attributes: 02 [01000000: Bulk] | |
| − | + | Maximum packet size: 0040 [64 bytes] | |
| − | Polling interval: 00 | + | Polling interval: 00 [Ignored: Not isochronous or interrupt type] |
Endpoint descriptor: | Endpoint descriptor: | ||
| − | Endpoint address: 82 | + | Endpoint address: 82 [10000010: IN endpoint 1] |
| − | + | Attributes: 02 [01000000: Bulk] | |
| − | + | Maximum packet size: 0040 [64 bytes] | |
| − | Polling interval: 00 | + | Polling interval: 00 [Ignored: Not isochronous or interrupt type] |
| + | </pre> | ||
=== Images === | === Images === | ||
Revision as of 21:44, 8 November 2009
PACmate 20 Braille Display
The PACmate 20 is a 20-cell braille display with two pushbuttons over each cell, and two 'whiz wheels' (mousewheel-type wheels) on either side of the braille area. It connects to a PC or other device via USB, and can be attached to the PACmate notetaker to integrate them into one device.
Notable Chips
| Chip | Chip Function | Use in Product |
|---|---|---|
| C8051F320 | Microcontroller w/ USB | Brains of the display, talks to the PC/device natively over USB. |
| LM358 | Op-amp | Don't know |
| TLC555 | Timer | Near large cap, small caps, and inductors. May be part of the HV charge pump? |
USB Descriptors
Configuration descriptor: Total length: 0020 Number of Interfaces: 01 Configuration value: 01 Configuration string: 00 Attributes: 80 [Device doesn't have own power, can't generate remote wakeups] Maximum power usage FA [500mA] Interface descriptor: Interface number: 00 Alternate: 00 Endpoints: 02 Class: FF [Vendor Specific] Subclass: 00 [Ignored: Class FF] Protocol: 00 [Ignored: Class FF] Interface string: 00 Endpoint descriptor: Endpoint address: 01 [10000000: OUT endpoint 1] Attributes: 02 [01000000: Bulk] Maximum packet size: 0040 [64 bytes] Polling interval: 00 [Ignored: Not isochronous or interrupt type] Endpoint descriptor: Endpoint address: 82 [10000010: IN endpoint 1] Attributes: 02 [01000000: Bulk] Maximum packet size: 0040 [64 bytes] Polling interval: 00 [Ignored: Not isochronous or interrupt type]
Images
