InsideGadgets Logic Observer
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The insideGadgets Logic Observer is an 8-channel logic analyzer with up to 50MHz sampling rate. It is a mostly open project with all source code (CPLD, MCU) available, as well as a schematic of the PCB.
See insideGadgets Logic Observer/Info for more details (such as lsusb -v output) about the device.
Hardware
Protocol
The device is controlled entirely via USB control messages. The command is encoded in the request value of the control message; value and index are unused.
The following requests are defined:
USB_TRANSFER (1)
This tells the device to transfer the samples captured in memory to the host. This is called multiple times; the buffer memory is transferred 254 bytes at a time, with the address increasing automatically. The address is reset when a capture is started or settings are updated.
USB_SETTINGS (2)
Send new settings to the device. The settings consist of the following eight bytes sent along with the control request:
| | |Byte|Description| |0|Bitmask of the channels to trigger on. All channels marked according to the trigger level must match before a trigger is considered to have fired.| |1|Level to trigger on (0 or 1).| |2|Delay after trigger, in milliseconds.| |3|Trigger count: number of times the trigger must fire before the capture starts.| |4|Sample rate, as follows: | | |Value|Sample rate| |80|50 MS/S| |0|10 MS/S| |1|5 MS/S| |3|2.5 MS/S| |9|1 MS/S| |19|500 KS/S| |39|250 KS/S| |99|100 KS/S|| |5|Number of samples to capture| |6|Start capture flag: a capture is started if this is not 0.| |7|Always 0.|
USB_STATUS (3)
Returns a 2-byte status field. The first byte indicates whether capturing has finished (1) or not (0). The second byte is always 0.
USB_CANCEL (4)
This cancels a capture in progress.