Firmware & Embedded Software
Bare-metal and RTOS-based firmware, custom mesh protocol stacks, OTA pipelines, cloud integration, and mobile app connectivity — engineered for a 5+ year field life.
Explore the ArchitectureArchitecture
We layer firmware deliberately: a hardware abstraction at the bottom that hides silicon variance from the rest of the codebase, a service layer for radios, storage, and security primitives, and an application layer that is portable across SoC families. The bootloader is treated as its own product — signed, minimal, dual-bank, and capable of falling back if a new image fails to verify or boot.
For safety-related firmware we run a separate vital partition under MISRA-C with no dynamic allocation and no recursion, voted against an asserting watchdog. Non-FuSa firmware uses FreeRTOS or Zephyr depending on resource budget, with a thread-safety convention enforced at code-review time rather than left to chance.
OTA is engineered as a pipeline, not a feature. Builds flow from a CI rig, through automated regression on a hardware lab, into a staged rollout that can be paused or reversed by the operations dashboard. Every firmware version shipped is reproducible from a tagged commit.
Engineering Approach
Code review is mandatory and binding — no commit reaches a release branch without two senior engineer sign-offs and a green CI run on real hardware. Static analysis covers MISRA, Cppcheck, and Coverity for the safety-relevant codebases; security scans run on every PR for cryptographic primitives and key handling.
Test coverage is measured both at the unit level (host-side build with mocked HAL) and on device (running the actual firmware on a board fleet of representative SKUs). The goal is to fail in the lab loud enough that the field never sees it.
We treat documentation as code. Every public API has a doc block, every release has automated changelog generation, and every shipped device gets a build manifest with the exact commit, toolchain, and signing certificate that produced it.
Standards & Compliance
Coding standards are per latest MISRA-C for safety-relevant work and the CERT-C secure coding subset for non-safety. Functional safety practice aligns with IEC 61508 SIL classification where the application demands it, and ISO 26262 ASIL where automotive deliveries require it.
Cryptographic primitives follow NIST-approved suites and are validated against the CSA / Matter certification battery for the consumer products, with regular dependency review for CVE exposure on every shipped image.
Where this capability ships in the world.
Real products that exercise the firmware & embedded software stack — click through for the full case study.
Meshstatic LoRa Mesh Node
A Meshstatic-protocol compliant LoRa mesh node delivering up to 29 dBm transmit power for exceptional long-range off-grid coverage.
Smritimegh — स्मृतिमेघ
A self-hosted Network Attached Application and Storage Server for individuals and organisations that care deeply about data privacy and control.
Wi-Fi Home Automation System
Smart switches, dimmers, outlets, sensors, and controllers — hubless Wi-Fi operation with local and cloud control and OTA firmware.
Other engineering disciplines at DSPWorks.
Railway Signalling Engineering
Trackside and control-room systems for signalling, interlocking, and train protection. Designed to RDSO and CENELEC standards for Indian Railways and metro networks.
Wireless Systems
Multi-protocol wireless hardware design across LoRa, BLE-LR, IEEE 802.15.4g sub-GHz, Wi-Fi, Thread, Matter, and 4G/LTE — tuned for range, power, and data.
Location & Tracking Systems
GNSS-based tracking hardware with indoor fallback via Wi-Fi SSID positioning and BLE-LR. From 12×12 mm embeddable modules to M2M-connected field trackers.
Home Automation Systems
End-to-end home automation — device hardware, firmware, cloud backend and mobile app. 802.15.4g sub-GHz mesh, Wi-Fi, and Matter / Thread — supplied as OEM platforms.
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