A 16-channel logic analyzer for RP2040 that implements the extended SUMP protocol.
- 16 channels
- 200 MHz sample rate
- 100K samples
- 1K pre-trigger samples
- Level and edge triggers
- Up to 4 triggers in a single stage
- RLE support
Flash the firmware binary to the RP2040, then connect it to a SUMP-compatible client such as:
- PulseView (1)(2)
- sigrok-cli
- Jlac
(1) libsigrok has a bug when reading from the device. The maximum sample rate and maximum sample size shown in PulseView are incorrect. See this fork, which fixes the issue.
(2) The SUMP protocol does not define trigger types, and libsigrok sends only first-stage triggers. Use the GPIO boot configuration to select the trigger type for PulseView.
The 16 logic analyzer channels are available on GPIOs 0 to 15.
If enabled, debug output is available on GPIO 16 at 115200 bps.
GPIOs 18 and 19 are used for boot-time configuration. See Configuration.
By default, trigger edge override is enabled. To use level trigger behaviour, see Configuration.
Up to four triggers can be enabled. Any additional triggers are ignored.
The onboard LED blinks at boot and during capture.
Binaries are generated automatically by GitHub Actions for both release and development builds.
Binaries are available in Releases.
The firmware binary is provided as logic_analyzer.uf2.
Download logic_analyzer.uf2 and drag and drop it onto the RP2040 in BOOTSEL mode.
To connect from PulseView:
- Open the Connect to Device dialog
- Select Openbench Logic Sniffer & SUMP compatibles (ols)
- Select Serial interface
- Click Scan for devices and accept
RLE can be enabled in the Device Configuration dialog:
GPIOs 18 and 19 are used to configure the device at boot.
Connect the GPIO to GND at boot time to enable or select the option.
Trigger type
The SUMP protocol has only one trigger type, and PulseView sends only first-stage triggers.
GPIO 19 to GND: use stage-based triggers (PulseView triggers are interpreted as level triggers).
If not grounded, all triggers are treated as edge triggers.
Debug mode
GPIO 18 to GND: enable debug mode. Debug output is available on GPIO 16 at 115200 bps.
If neither GPIO is grounded, the default configuration is:
- Trigger edge override: enabled
- Debug mode: disabled