PoLabs PoScope Basic2

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PoLabs PoScope Basic2

The PoLabs PoScope Basic2 is a 16-channel, 8MHz, USB-based logic analyzer (plus oscilloscope, signal/pattern generator, and more).

See PoLabs PoScope Basic2/Info for some more details (such as lsusb -vvv output) on the device.

Components

Photos

Protocol

Starting a sampling run

The command for starting an acquisition is a USB control transfer (request type: vendor-specific, request: 0x07, value: 0xffa0, index: 0x0000, length: 9).

The 9 bytes of data:

Byte Description Comments
0 Samplerate divider (see table below)
1
2
3
4
5 Trigger mask Bit 0 is the mask for probe 0, bit 7 is the mask for probe 7. The same byte is used as trigger mask byte for bus A or bus B (only one at a time is possible).
6
7
8

Stopping a sampling run

Sample rates

8MHz - 4MHz:

Buffer size is 128 bytes, only bus A is available, ...

Samplerate Divider Request value
8 MHz 0x00 0xfffd
6 MHz 0x01 0xfffc
4 MHz 0x02 0xfffa

2.6MHz - 2MHz:

Buffer size is 1160 bytes, only bus A is available, ...

Samplerate Divider Request value
2.6 MHz 0x03 0xfff7
2 MHz 0x04 0xfff4

1MHz - 600kHz:

Buffer size is 1544 bytes, ...

Samplerate Divider Request value
1 MHz 0x05 0xffe8
900 kHz 0x05 0xffe6
800 kHz 0x05 0xffe2
700 kHz 0x05 0xffde
600 kHz 0x05 0xffd8

500kHz and lower:

Buffer size is only limited by the PC memory, ...

Samplerate Divider Request value
500 kHz 0x05 0xffd0
400 kHz 0x05 0xffc4
300 kHz 0x05 0xffb0
250 kHz 0x06 0xff88
200 kHz ...
150 kHz ...
100 kHz ...
90 kHz ...
80 kHz ...
70 kHz ...
60 kHz ...
50 kHz ...
40 kHz ...
30 kHz ...
25 kHz ...
20 kHz ...
10 kHz ...
9 kHz ...
8 kHz ...
7 kHz ...
6 kHz ...
5 kHz ...
4 kHz ...
3 kHz ...
2.5 kHz ...
2 kHz ...
1 kHz ...

Sample format

Buffer size

Pre-Trigger

Trigger settings