Analys och utveckling avverifieringsenhet för säker kontakteringvid kalibrering av RRUS.
This report presents a master thesis project performed at Elekta AB during the fall of 2013 and early 2014. Elekta is a medical technology company and their main product in the Stockholm office is a gamma knife used for radiosurgery. The gamma knife contains a cluster of a dozen motor servos and motors used for adjusting the patient and the radiation sources over a CAN bus. A self-developed hardware-in-loop simulator running on a PC with LabVIEW is currently being used for integration level testing of the control system of the gamma knife. The simulator has some problems with it not running in real-time and having other performance issues. This is suspected by Elekta to be due to the massive amount of CAN, serial, and other messages being handled. Elekta, not wanting to invest in expensive dedicated HIL hardware, are looking for an inexpensive way to rebuild the HIL simulator on a generic low cost embedded system.The focus of the project has been to investigate if it?s possible to replace the HIL simulator with a cheaper embedded system. This was at the end of the project done by building a proof of concept device to demonstrate this.Related to this problem area was a case study also carried out at Elekta about how the company works with Validation, Verification and Testing. The aim of the study was to investigate if there are any changes that the company can make to improve their VVT process. This was done by conducting a literature review and performing interviews with developers and testers at the company.A reproduction of the core functionality of the current HIL simulator was implemented on a STM32F103 microcontroller from STMicroelectronics using the ARM Cortex M3 processor with the ARM7 architecture. The microcontroller was able to successfully interfacing with the control system and simulating the cluster of motor servos and its mechanical systems with sufficient real-time performance.The conclusions of the carried out project is that it?s possible for Elekta to implement the core functionality of their current HIL simulator on a Cortex M3 microcontroller. Elekta do however need to investigate further if moving the complete HIL simulator to an embedded system will make further development and usability of the simulator more complex and expensive.