Industrial Automatic Control Systems and Controllers Annotation << Back Organization of external file sharing for a microcontroller based portable electronic device A.A. Vasenev, S.A. Sorokin The article provides a solution to the problem of organizing a holistic, fast and understandable for the end user file sharing between a microcontroller based portable electronic device with an installed microSD card and modern operating systems. The solution is provided within the project of the developed portable device for testing and configuring multifunctional emergency calculators-recorders. The article considers and analyzes the existing solutions for organizing fi le sharing for embedded electronic systems. The problem solution is based on the use of the MSC (Mass Storage Class) USB device class. An algorithm for efficient data exchange with an SD card has been developed. When programming, the method of deep analysis and adaptation of existing software solutions to the task is used. A file sharing program in the C language has been developed. Keywords: embedded electronic systems, operating systems, microcontroller, software, file sharing, microSD. DOI: 10.25791/asu.4.2022.1359 Pp. 19-26.