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Use of packet-based real-time audio and video transmission gets more and more common nowadays. These systems consist of precisely synchronized distributed nodes, the synchronization is usually done using the IEEE 1588 Precision Time Protocol. For example, the well-known Dante system also utilizes PTP as the synchronization solution, and Audio Video Bridging (IEEE 802.1BA-2011) as well. In this paper I introduce a prototype system designed for hardware-level sampling synchronization based on the STM32H743 480MHz Cortex-M7 microcontroller with the aim of describing the synchronization algorithm. A custom extension board has been also made tailored to the NUCLEO development board featuring the MCU to provide us with the required analog and the synchronized I2S-interface This board gives a place for the TLV320AIC23BPW stereo CODEC performing A/D and D/A conversions. This system is designed for audio-frequency range – that's why I use audio a CODEC instead of discrete A/D and D/A converters.
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