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μLA: Micro Logic Analyzer

SUMP/OLS compatible logic analyzer firmware for RP2040 based boards.

Features

  • 16 channels
  • 100 MHz sampling rate, 1 sample per sys tick
  • 200 KB sample memory
  • Fast triggers using PIO
  • Input channels mapped to GPIO 0-15

Supported hardware

  • Raspberry Pi Pico
  • uPico
  • Virtually all RP2040 based boards with USB connection and GPIO 0-15 available
  • Bring your own RP2040 hardware with proper frontend and protection

Installation

  1. Download latest firmware build from Releases page
  2. Hold the BOOTSEL button while connecting your board to the computer
  3. Copy firmware file downloaded earlier to the RPi-RP2 disk
  4. Use PulseView of SigrokCli to connect to probe
  5. Enjoy

Client software

PulseView

PulseView is a Qt based logic analyzer GUI for sigrok.

Select Openbench Logic Sniffer & SUMP compatible protocol when connecting to μLA.

Protocol selection Connect window
uLA: Micro Logic Analyzer uLA: Micro Logic Analyzer

SigrokCli

SigrokCli is a command-line frontend for sigrok.

Scan for devices

$ sigrok-cli -d ols:conn=/dev/tty.usbmodem_ula_1 --scan

  The following devices were found:
  ols - uLA: Micro Logic Analyzer with 16 channels: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Sample two 10 MHz square waves with 90° phase shift

$ sigrok-cli -d ols:conn=/dev/tty.usbmodem_ula_1 
    -O ascii:charset='_`\/'
    --config samplerate=100m
    --samples 70

  libsigrok 0.5.2
  Acquisition with 16/16 channels at 100 MHz
  0:``\____/`````\___/`````\___/`````\___/`````\___/`````\___/`````\___/``
  1:____/`````\____/````\____/````\____/````\____/````\____/````\____/````
  2:______________________________________________________________________

Building firmware

  1. Install rustup by following the instructions at https://rustup.rs
  2. Install Cortex-M0, M0+, and M1 (ARMv6-M architecture) target: rustup target add thumbv6m-none-eabi
  3. Install LLVM tools: rustup component add llvm-tools-preview
  4. Install cargo-binutils: cargo install cargo-binutils (Note: on some Linux distros (e.g. Ubuntu) you may need to install the packages build-essential, gcc-arm-none-eabi, libssl-dev and pkg-config prior to installing cargo-binutils)
  5. Install elf2uf2: cargo install elf2uf2-rs
  6. Clone this repo: git clone git@github.com:dotcypress/ula.git && cd ula
  7. Hold the BOOTSEL button while connecting your board to the computer
  8. Flash microcontroller: cargo run --release

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.