Some resources to help you getting started with STM32 programming.
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AFE4400 is a very suitable for pulse oximetry applications fully integrated analog front end (AFE). This device includes a with integrated ADC (ADC) of the low-noise receiver channel, a LED emitting member and diagnostic functions for sensor and LED fault detection. This device is a configurable timing controller. This flexibility allows the user to completely control the timing characteristics of the device. To simplify timing requirements and to provide a low jitter clock AFE4400 also integrates an external crystal oscillator for a frequency. This device uses a SPI interface microcontroller or host processor to communicate with the outside.