参考文档 RM0430 STM32F413/423 advanced ARM®-based 32-bit MCUs AN2739 How to use the high-density STM32F103xx microcontroller to play audio files with an external I²S audio codec AN3998 PDM audio software decoding on STM32 microcontrollers UM1718 STM32CubeMX for STM32 configuration and initialization C code generation