Difference between revisions of "Braintechnology USB-LPS"
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!Other byte | !Other byte | ||
|- bgcolor="#eeeeee" | |- bgcolor="#eeeeee" | ||
| | |||
| | |||
| | |||
|- bgcolor="#dddddd" | |||
| | |||
| | |||
| | |||
|- bgcolor="#eeeeee" | |||
| | |||
| | |||
| | |||
|- bgcolor="#dddddd" | |||
| 12 MHz | | 12 MHz | ||
| 0x03 | | 0x03 | ||
| 0xee | | 0xee | ||
|- bgcolor="# | |- bgcolor="#eeeeee" | ||
| 10 MHz | | 10 MHz | ||
| 0x02 | | 0x02 | ||
| 0xae | | 0xae | ||
|- bgcolor="# | |- bgcolor="#dddddd" | ||
| 8 MHz | | 8 MHz | ||
| 0x05 | | 0x05 | ||
| 0xee | | 0xee | ||
|- bgcolor="# | |- bgcolor="#eeeeee" | ||
| 6 MHz | | 6 MHz | ||
| 0x07 | | 0x07 | ||
| 0xee | | 0xee | ||
|- bgcolor="# | |- bgcolor="#dddddd" | ||
| 5 MHz | | 5 MHz | ||
| 0x05 | | 0x05 | ||
| 0xae | | 0xae | ||
|- bgcolor="#eeeeee" | |||
| 4 MHz | |||
| 0x0b | |||
| 0xee | |||
|- bgcolor="#dddddd" | |- bgcolor="#dddddd" | ||
| | | 3 MHz | ||
| 0x0f | |||
| 0xee | |||
|- bgcolor="#eeeeee" | |||
| 2.5 MHz | |||
| 0x0b | | 0x0b | ||
| 0xae | |||
|- bgcolor="#dddddd" | |||
| 2 MHz | |||
| 0x17 | |||
| 0xee | |||
|- bgcolor="#eeeeee" | |||
| 1.5 MHz | |||
| 0x1f | |||
| 0xee | |||
|- bgcolor="#dddddd" | |||
| 1 MHz | |||
| 0x2f | |||
| 0xee | |||
|- bgcolor="#eeeeee" | |||
| 800 kHz | |||
| 0x3b | |||
| 0xee | |||
|- bgcolor="#dddddd" | |||
| 750 kHz | |||
| 0x3f | |||
| 0xee | |||
|- bgcolor="#eeeeee" | |||
| 600 kHz | |||
| 0x4f | |||
| 0xee | |||
|- bgcolor="#dddddd" | |||
| 500 kHz | |||
| 0x5f | |||
| 0xee | |||
|- bgcolor="#eeeeee" | |||
| 400 kHz | |||
| 0x77 | |||
| 0xee | |||
|- bgcolor="#dddddd" | |||
| 300 kHz | |||
| 0x9f | |||
| 0xee | | 0xee | ||
|- bgcolor="#eeeeee" | |- bgcolor="#eeeeee" | ||
| | | 250 kHz | ||
| | | 0xbf | ||
| | | 0xee | ||
|- bgcolor="#dddddd" | |||
| 200 kHz | |||
| 0xef | |||
| 0xee | |||
|- bgcolor="#eeeeee" | |||
| 150 kHz | |||
| 0xc7 | |||
| 0xae | |||
|- bgcolor="#dddddd" | |||
| 120 kHz | |||
| 0xf9 | |||
| 0xae | |||
|} | |} | ||
</td></tr></table> | </td></tr></table> | ||
The byte values for sampling with 8 or 16 probes are thus identical, the only difference is that the sampling rates 24/16/15MHz are not available when 16 probes are used. | |||
=== Sample format === | === Sample format === | ||
Revision as of 03:55, 5 January 2012
The Braintechnology USB-LPS is a Cypress FX2 based 16-channel, 24MHz, USB-based logic analyzer and signal/pattern generator.
See Braintechnology USB-LPS/Info for some more details (such as lsusb -vvv output) on the device.
Components
- Cypress CY7C68013A-56PVXC (FX2)
- Atmel ATTiny13-20SU
- LD33 (3.3V voltage regulator)
- 24MHz crystal
Protocol
Firmware upload
The FX2 firmware (3072 bytes in size) is uploaded before every sampling run. Certain bytes in the firmware differ depending on the selected sampling rate.
Starting a sampling run
The host seems to send: 0x00 0x01 0x00 0x00 0x00
Stopping a sampling run
The host seems to send: 0x00 0x00 0x00 0x00 0x00
Sample rates
|
Sampling with 8 probes:
|
Sampling with 16 probes:
|
The byte values for sampling with 8 or 16 probes are thus identical, the only difference is that the sampling rates 24/16/15MHz are not available when 16 probes are used.
Sample format
TODO.
Triggers
Not relevant to the protocol, happens purely in software.