WIP: mic

[kienvo]

Resolve #95

Summary by Sourcery

Introduce WIP microphone support by initializing ADC on PA7, reading audio samples via mic_adc(), and driving the LED framebuffer as an audio visualizer in the main loop.

New Features:

• Initialize ADC on PA7 and expose mic_init() and mic_adc() functions for microphone input
• Visualize real-time audio levels by updating the LED framebuffer based on ADC readings in the main loop

Enhancements:

• Comment out the initial charging display call to clear the screen before running the audio visualizer

[sourcery-ai]

Reviewer's Guide

This PR introduces basic microphone support by configuring the ADC on PA7, provides sampling functions, and updates the main loop to visualize microphone input on the LED framebuffer, while temporarily disabling the initial charging display.

Class diagram for new microphone support functions

classDiagram
    class main {
    }
    class mic {
        +void mic_init()
        +uint16_t mic_adc()
    }
    main ..> mic : uses

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File-Level Changes

Change	Details	Files
Added microphone ADC initialization and sampling interface	Implemented mic_init() to configure GPIOA PA7 as analog input and set up ADC parameters Implemented mic_adc() to select channel 11 and perform a single ADC conversion	src/main.c
Updated main() to visualize microphone input on LEDs in a continuous loop	Inserted a new infinite loop before normal operation to read mic_adc() and update fb array based on ADC readings Added DelayMs(10) for loop pacing and a poweroff condition when mode is not NORMAL Ensured spawn_tasks() is called before entering the mic-driven loop	src/main.c
Temporarily disabled initial charging display	Commented out the disp_charging() call in main initialization	src/main.c

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#95	Add support for the microphone in the firmware.	✅
#95	Implement audio/sound visualizations based on microphone input, inspired by the provided example images.	✅

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