Firmware service brochure

We work with your schematics, boards and source code to define device behavior. Scope can cover motor and sensor control, BLE, state machines and fault handling, through hardware–firmware review, testing and handover.

EMBEDDED FIRMWARE / Overview

ENGINEERING SERVICE BROCHURE / 2026.09

Embedded Firmware

From hardware potential to product behavior.
Interpret sensor inputs and control external devices.

We develop and improve MCU firmware based on your circuits, boards and existing code. We connect sensor processing, device control and wired or wireless communication, and design state transitions, fault handling, shutdown and recovery behavior.

CONTROL APPLICATIONSTurn input signals and commands into product behavior.
Control devices through their drive circuits and interfaces.

01 ANALYSIS & DESIGN

Review requirements, circuits and existing code.
Define I/O, state transitions and fault handling.

02 DEVELOPMENT & VERIFICATION

Develop and improve control and communication.
Verify hardware–firmware integration and behavior.

03 REPRODUCIBILITY & HANDOVER

Deliver build setup, source code and documentation.
Provide agreed test results and outstanding issues.

EMBEDDED FIRMWARE / Engineering

01 / ENGINEERING DEPTH

Six disciplines behind device behavior

Beyond individual drivers, we define control timing, data flow, exception handling and the way people operate the product.

01MOTION CONTROL

Motor & encoder control

Review PWM control, encoder feedback and PID timing. Define acceleration, deceleration, direction changes, homing and missing-pulse detection for the device.

PWM · Timer · Encoder · PID

02SENSING & ACQUISITION

Sensors & ADC acquisition

Review sampling, channel switching, filtering, contact detection and calibration. Align firmware acquisition timing with the circuit’s signal-settling requirements.

ADC · MUX · Filtering · Calibration

03DEVICE CONNECTIVITY

BLE & device communication

Define command/status packets, timing, acknowledgements, timeouts and retries. Address disconnection behavior and state consistency after reconnection.

BLE · UART · SPI · I2C

04PRODUCT BEHAVIOR

State machines & device UI

Separate start, pause, completion and fault states. Align short/long button presses, displays, alerts and battery indicators with actual device behavior.

State machine · Button · Display · Buzzer

05FAULT HANDLING

Output control & exceptions

Define sensor-fault, low-voltage and charging conditions, plus watchdog/reset recovery. Consolidate output control and review conflicting commands.

Interlock · Watchdog · Reset · Power state

06CODE MODERNIZATION

Legacy code & refactoring

Identify active build sources and execution paths. Separate BSP, drivers and product logic; document board revisions, pin assignments, build settings and changes.

C/C++ · BSP/HAL · Build · Regression

EMBEDDED FIRMWARE / Applications

02 / APPLICATIONS

Products and engineering challenges we can scope

These service examples generalize technical challenges addressed in our review materials. Implementation and testing scope is agreed for each product.

01 / CONNECTED MOTION

Wireless motor-driven devices

Products that must align target speed, actual motion and status across a controller and wireless device.

Encoder scaling, loop timing, speed ramps and direction changes
BLE commands, responses, disconnects and reconnection
Consistent controls, display, battery and motion states

What we documentControl sequences · protocol definitions · verification items

02 / MULTI-MODE DEVICE

Equipment with multiple operating modes

Products that need coordinated user commands, sensor conditions and output sequences.

Mode selection, start, pause and shutdown states
Output permission under contact, charging and sensor conditions
Separate UI and output management; define fault recovery

What we documentState transitions · output conditions · requirements-to-test matrix

03 / SENSOR ACQUISITION

Multi-channel sensor boards

Systems whose analog input characteristics and MCU acquisition settings must work together.

ADC sampling, MUX switching and signal-settling review
I2C sensor and USB interface requirements against the circuit
Startup, power sequencing, acquisition and transfer requirements

What we documentH/W–F/W interface conditions · open questions · test plan

EMBEDDED FIRMWARE / H/W–F/W Review

03 / HARDWARE–FIRMWARE REVIEW

Find the gaps between circuits and code

Matching pins do not guarantee matching behavior. We compare schematics, component documentation, active sources and build artifacts to identify integration issues.

Pin mapping & control meaning

What does a stop command actually switch off?

Compare GPIO names, polarity, driver truth tables and power paths. Distinguish output-level changes, motor stops and actual power disconnection.

Active build & execution paths

Does the function under review actually run?

Check project settings, linker maps and call paths to identify active code. Review whether legacy files and comments describe the implementation in use.

Sensing, timing & units

Do measurements and control timing agree?

Compare encoder scaling, gear ratio, PID timing and ADC conversion. Review the combined delay from circuit filtering, sampling and accumulated fault decisions.

Fault stops & recovery

What state follows a disconnect or reset?

Review missing pulses, communication loss, charging, watchdog and reset paths. Separate software stopping from hardware cutoff and define restart conditions.

Document/code findings are distinguished from physical measurements. Board verification is separately performed with the agreed hardware, equipment and test conditions.

EMBEDDED FIRMWARE / Architecture & Verification

04 / ARCHITECTURE & VERIFICATION

Separate product decisions from hardware control

Clear responsibilities make product behavior easier to trace and test when the board changes.

01
Product behavior
Modes · state transitions · user actions
02
Control & communication
Algorithms · packets · output permission
03
BSP & drivers
Pin mapping · timers · ADC · peripherals
04
Board & devices
MCU · motor · sensors · display

BEHAVIOR DESIGN

Design the exception paths, too

Ready
Active
Stop & check
User resumes

Example: stop output on a sensor fault or disconnection, then define recovery conditions and an explicit resume action. The policy is agreed for each product.

Evidence with a clear verification scope

Code & circuit review

Requirements, pin assignments, active sources and execution paths

Reproducible build

Toolchain, SDK, settings, binaries and change history

Host & regression tests

State transitions, boundaries and exceptional inputs

Board & integration tests

Measurement conditions, instruments, traces and acceptance criteria

Activities depend on the agreed scope and available test setup. Code, build and host-test results are reported separately from physical-board measurements.

EMBEDDED FIRMWARE / Process & Handover

05 / PROCESS & HANDOVER

Deliverables your next development cycle can use

01
Review inputs
Check requirements, schematics, board revisions, source code and build setup.
02
Define behavior
Agree on states, control, interfaces, exceptions and acceptance criteria.
03
Develop & test
Implement and run regression tests, then verify on boards under agreed conditions.
04
Hand over
Deliver source, binaries, documentation, test results and outstanding issues.

Source & structure

Agreed source code, module responsibilities and changes

Build environment

Toolchain/SDK versions, build options and instructions

Binaries & programming

Board-specific releases and programming instructions

Behavior & interfaces

States, pin assignments, protocols and output conditions

Test evidence

Agreed test conditions, results, traces and logs

Open issues & handover

Unverified items, reproduction steps and follow-up actions

DEFINED IN YOUR PROPOSAL

Agreed deliverables

The proposal specifies source code, build configuration, binaries, behavior/interface documents, changes and test results. SDK and third-party sources follow their applicable terms.

EMBEDDED FIRMWARE / Scope & Contact

06 / SCOPE & CONTACT

Your board. Your next product milestone.

We will help define a starting point: new firmware, an existing codebase or a focused improvement.

Quoted after review

Pricing depends on source/build availability, MCU and board count, control and interface complexity, code condition and physical test requirements.

Separately scoped work

Circuit redesign, PCB fabrication, prototypes, test fixtures, accredited testing, certification and on-site support are scoped and priced separately.

Clearly defined verification

Code reviews, builds, host tests and physical-board tests are reported separately, with unverified items and further checks identified.

Start with the materials you have

Product purpose, desired behavior or observed symptoms
Schematics, MCU, board revision and relevant datasheets
Existing source, SDK, build instructions and protocol specifications
Target schedule, deliverables and board/test equipment availability

LET’S BUILD TOGETHER

Discuss firmware development

swhong@cyberdream.biz

+82 32 832 1361 · cyberdream.co.kr

Discuss firmware development ↗Online inquiry: Embedded firmware