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The current Arduino-based implementation exhibits regular voltage spikes on all available ADC channels—likely introduced by framework-driven timers and interrupt overhead. To eliminate these artifacts and improve overall signal fidelity, reimplement the acquisition routine using the STM32 HAL library (both F4 and G4 series). The new design must:
-Maintain fixed ADC sampling at 500 Hz across all available channels
-Use DMA for multi-channel conversions to minimize CPU load
-Trigger conversions via dedicated hardware timers to eliminate jitter
-Stream data over a lightweight serial protocol without packet loss