InsideGadgets Logic Observer
|Min/max voltage||2V — 5.5V|
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.
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:
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.
Send new settings to the device. The settings consist of the following eight bytes sent along with the control request:
|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:
|5||Number of samples to capture|
|6||Start capture flag: a capture is started if this is not 0.|
Returns a 2-byte status field. The first byte indicates whether capturing has finished (1) or not (0). The second byte is always 0.
This cancels a capture in progress.