FIRMWARE

Calpak USA develops production firmware across ARM Cortex-M0/M3/M4/M7, PIC, AVR, ESP32, and RISC-V architectures, along with FPGA and CPLD platforms from Xilinx, Intel, and Lattice. Our Hawthorne, California engineers select the optimal silicon based on your application's processing throughput, power budget, peripheral requirements, and long-term supply chain availability. We deliver bare-metal drivers, board support packages, and hardware abstraction layers that give your product a portable firmware foundation. Whether the target is a low-power sensor node running on a Cortex-M0 or a high-performance DSP pipeline on a Cortex-M7, Calpak provides architecture-specific optimization including cache management, DMA configuration, and interrupt prioritization. All firmware is developed under our AS9100 and ISO 9001 quality system with full version control, peer code review, and documented release processes.

Calpak USA has extensive RTOS expertise spanning FreeRTOS, Zephyr RTOS, ThreadX, and bare-metal schedulers for deterministic embedded applications. Our engineers implement priority-based preemptive scheduling, inter-task communication via queues and semaphores, and interrupt-driven architectures that meet sub-millisecond timing deadlines required in aerospace, defense, and industrial control systems. Calpak USA also configures memory protection units, stack overflow detection, and watchdog supervisors to ensure system stability under fault conditions. We perform worst-case execution time analysis and interrupt latency characterization during development to verify real-time guarantees before hardware-in-the-loop testing begins. Every RTOS integration project at our Hawthorne, California facility follows MISRA C coding guidelines where applicable and includes full task-level documentation so your internal team can maintain and extend the firmware after delivery.

Calpak USA co-locates firmware and hardware engineers at our Hawthorne, California facility, enabling true hardware-software co-design from day one. Our embedded developers participate in schematic reviews to influence peripheral selection, pin mapping, and clock tree architecture before the PCB is laid out. During board bring-up, Calpak USA firmware engineers write and validate low-level drivers for SPI, I2C, UART, ADC, and GPIO peripherals directly on prototype hardware, catching integration issues weeks earlier than sequential development workflows allow. This concurrent approach means firmware timing constraints inform trace routing decisions, and power management firmware is validated alongside the actual power supply design. Calpak USA delivers a complete board support package with peripheral drivers, initialization sequences, and diagnostic routines so that your application-layer development starts on a verified, stable platform.

Calpak USA applies a multi-layer validation methodology that includes static analysis with tools like PC-lint and Polyspace, unit testing using CUnit and Unity frameworks, and integration testing on target hardware through JTAG and SWD debug interfaces. Our engineers perform hardware-in-the-loop testing where firmware runs against actual sensors, actuators, and communication buses under controlled stimulus conditions that simulate real-world operating scenarios. Boundary condition testing, stress testing under thermal extremes, and power cycling validation are standard practice. Calpak USA also conducts formal code reviews against MISRA C guidelines for safety-critical projects and generates full regression test suites that your team can execute after future modifications. Every firmware release from our Hawthorne, California facility ships with a test report, known-issue log, and traceability matrix mapping requirements to verified test cases under our AS9100 quality system.

Calpak USA develops firmware for Bluetooth Low Energy 5.x, Wi-Fi (802.11 b/g/n/ac), Zigbee, Thread, and LoRaWAN protocols using chipsets from Nordic Semiconductor, Espressif, Texas Instruments, and Silicon Labs. Our wireless firmware includes complete protocol stack integration, antenna matching network coordination with our RF hardware team, power-optimized duty cycling for battery-powered devices, and secure pairing and authentication mechanisms. Calpak USA implements GATT service definitions for BLE, MQTT and CoAP clients for IoT cloud connectivity, and mesh networking topologies for Zigbee and Thread deployments. We validate RF performance with conducted and over-the-air testing to ensure reliable range, throughput, and coexistence in dense wireless environments. All wireless firmware projects at our Hawthorne, California facility include FCC and CE pre-compliance testing support to streamline your regulatory certification process.

Calpak USA designs secure bootloader architectures with cryptographic firmware verification using AES-256 encryption and SHA-256 hash validation to prevent unauthorized code execution on your devices. Our OTA update systems support delta and full-image updates over BLE, Wi-Fi, and cellular connections with automatic rollback protection that reverts to the last known-good firmware if an update fails integrity checks or post-update self-test. Calpak USA implements dual-bank flash partitioning for zero-downtime updates, version management with anti-rollback counters, and server-side update orchestration that lets you target specific device populations by serial number, firmware version, or deployment region. Our bootloader designs comply with secure boot chains required by platforms like ARM TrustZone and support hardware root of trust where available. Every OTA system Calpak USA delivers from our Hawthorne, California facility includes end-to-end encryption, certificate pinning, and comprehensive update logging.