La104 Firmware Work -

The LA104 firmware architecture is designed for portability and versatility, featuring a dual-mode system that allows it to operate as a logic analyzer, an oscilloscope, or a programmable platform for custom applications. 1. Core Firmware Architecture

1. Executive Summary

The LA104 is a low-cost, portable digital oscilloscope and logic analyzer manufactured by LuWii. Out of the box, it offers impressive hardware specifications for its price point but is limited by stock firmware that lacks analytical depth and customization options. la104 firmware work

A. Performance Optimization

• Waveform Update Rate: Optimization of the rendering pipeline to increase the waveform update rate, allowing users to capture sporadic glitches that the stock firmware would miss.
• Memory Depth: Unlocking the full use of the internal SRAM, allowing for longer time-base captures without sacrificing sample rate.
• UI Responsiveness: Refactoring the display drivers to ensure immediate feedback from the rotary encoder and buttons.

3.1. Adding New Protocol Decoders

The stock LA104 supports basic UART, I2C, and SPI. Through firmware work, you can add: The LA104 firmware architecture is designed for portability

The LA104 Logic Analyzer's functionality is significantly enhanced by replacing the stock firmware with open-source options like the gabonator or Ralim forks, which introduce features such as RF sniffing and improved UI responsiveness. Firmware flashing is achieved via DFU mode by holding specific buttons and dragging .hex files to the device, which acts as a USB drive. For instructions and firmware, visit gabonator GitHub. LA104 pocket logic analyser operating system - GitHub Waveform Update Rate: Optimization of the rendering pipeline

I trace the logic analyzer’s own logic. The display routine steals cycles. The buffer swap misses its window by two clock ticks. And the trigger detection… fragile. One comparator glitch and the whole capture shifts left by a sample.

The Hard Lessons

• The UI framework is fragile. The LA104’s GUI is a custom state machine. Add too many menu items, and you’ll overflow the stack. I spent a day debugging a hard fault that only occurred after pressing "Down" three times.
• FPGA interaction is key. The LA104 uses an FPGA for sampling. The firmware just loads a bitstream. Trying to change sample rates without understanding the FPGA’s PLL registers leads to gibberish data (ask me how I know).
• USB is slow for streaming. The stock firmware streams via USB 2.0 full-speed (12Mbps). You cannot do real-time 100MHz capture to a PC. The buffer is your only friend.