2. AUDIO PASSTHROUGH

A "passthrough" can be viewed as the audio equivalent of "hello world". In this chapter, we will build a passthrough with the hardware and software components previously introduced. Moreover, we will point out some key specifications from the microphone and the DAC (Digital-to-Analog Converter) components so that our STM32 board can successfully interface with them. This will be done in Section 2.1.

Using the CubeMX software, we will update the configuration of the microcontroller in Section 2.2. We will guide you through the wiring in Section 2.3. Finally, we will program our passthrough in Section 2.4 using the SW4STM32 software.

Highlighted boxes, as shown below, specify a task for you to determine the appropriate solution and implementation.

TASK: This is a task for you!

A passthrough is a great sanity check when first beginning with an audio DSP system. Moreover, it serves as a useful starting point for new projects as we will see in the following chapters when we develop more complicated programs!

Figure: Final wiring.