SOFTWARE ENGINEERING

The majority of the software work at Haman Engineering has been developing applications for small microcontrollers. This requires an intimate knowledge of the processor architecture, and attention to resource management. This necessitates efficient algorithm development and robust memory management. This could be anything from compact ISR coding in C, to preventing memory leaks in C++. Also, knowledge of the inner workings of the compiler and linker are essential. In a typical consumer device, the firmware has to handle power management, the user interface, sensor interfacing, graphics, audio, communications, and many more functions concurrently and with low latency. For simpler devices, the code is developed on the bare-metal, with properly written interrupts and the main loop utilizing state-machines to give the appearance of concurrency. For more complex devices, an RTOS is more appropriate to abstract the developer away from the low-level synchronization. Haman Engineering has experience developing with FreeRTOS.

Developing firmware requires the agility and experience to design multiple facets of the complete product. The following is a small sample of the functions directly developed by Haman Engineering:

• HAL Hardware Abstraction Layer
• This can be the most challenging portion of a microcontroller project. Typically in a team of developers, we are the most experienced dealing with the low-level microcontroller hardware and peripherals. We provide a HAL to the other developers to abstract the low-level hardware functions. This allows the other developers to quickly use our code for higher-level functions. It also provides a method to remove the hardware dependency on a particular chip or processor
• Bootloaders
• Flash Programmers
• I2C communication frameworks
• Complete low-level interrupt driven data exchange
• Buffered UART operations
• Complete low-level interrupt driven data exchange
• Communication protocols
• Error detection/handling
• Packet frameworks
• LCD Graphics libraries
• Text, static and scrolling
• Bitmaps, geometric shapes
• Complete GUI from scratch
• SPI Operations
• ADC Operation and filtering
• Noise filtering, averaging
• FIR, IIR
• DMA transfers
• Kalman Filtering
• Sensor interfacing (pressure, oxygen, accelerometer, RTC)
• USB
• Bluetooth
• PCM Audio
• Motor control/commutation
• Brushless motor commutation
• Stepper motor commutation
• Medical safety processes
• No single point of failure
• Supervising processor oversight routines
• Cryptography
• Client-Server communication

Working within an organization alongside other developers requires adherence to coding standards and proper project formatting. Haman Engineering has worked in environments where we are the sole developers, and also as members of a software engineering team. Haman Engineering maintains its own SVN server, and can interface with any version control software of the client organization.