Razvoj deljene tipkovnice Bluetooth na platformi STM32 z lastnim RTOS

Bažato, Nik (author), Rozman, Robert (mentor)

Diplomska naloga obravnava razvoj brezžične deljene tipkovnice, sestavljene iz dveh fizičnih enot, ki jih je mogoče poljubno razporediti za dosego ergonomske postavitve. Enoti med seboj komunicirata preko žične serijske povezave USART, medtem ko leva (glavna) enota omogoča brezžično povezavo z računalnikom ali drugo napravo preko BLE. V sklopu naloge smo zasnovali in implementirali tudi lasten RTOS, prilagojen za tipkovnice na osnovi mikrokrmilnika STM32. Razporejevalnik uporablja preprosto krožno razporejanje opravil, kar omogoča zanesljivo izvajanje opravil skeniranja matrike tipk, obdelavo USART prenosa in pošiljanje BLE poročil HID. Poleg programske opreme smo razvili še tiskano vezje (PCB) in ohišje tipkovnice. Delovanje tipkovnice je bilo preizkušeno z vidika pravilnega zaznavanja pritiskov tipk, stabilnosti komunikacije USART in BLE ter odzivnosti sistema.

• Language: Slovenian
• Keywords: tipkovnica, vgrajeni sistemi, RTOS, realno časovni operacijski sistem, mikrokrmilnik, Cortex-M4, Bluetooth Low Energy (BLE), HID, tiskano vezje, serijski prenos
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FRI - Faculty of Computer and Information Science
• Year: 2025
• PID: 20.500.12556/RUL-172840
• COBISS.SI-ID: 250295555
• Publication date in RUL: 11.09.2025

Secondary language

• Language: English
• Title: Development of the Bluetooth split keyboard on STM32 platform with custom RTOS

Abstract

This diploma thesis addresses the development of the wireless split keyboard, consisting of two physical units that can be placed freely to achieve an ergonomic layout. The units communicate with each other via a wired USART serial connection, while the left (main) unit provides a wireless connection to a computer or another device via BLE. As part of the project, we also designed and implemented a custom RTOS tailored for microcontroller-based keyboards using the STM32 platform. The scheduler employs a simple round-robin task activation, enabling reliable execution of tasks for key matrix scanning, USART transmission handling, and sending HID reports over BLE. In addition to the software solution, we developed the printed circuit board (PCB) and the keyboard enclosure. The keyboard’s operation was tested in terms of correct key press detection, stability of USART and BLE communication, and system responsiveness.

• Keywords: keyboard, embedded systems, RTOS, real-time operating system, microcontroller, Cortex-M4, Bluetooth Low Energy (BLE), HID, printed circuit board (PCB), serial communication