====== Analog Input (GPIO) ======

  * The output buffer is disabled.
  * The Schmitt trigger input is inactive.
  * The pull-up and -down resitors are inactive.
  * Reading IDR returns "0".

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===== Programming Instructions =====

==== Enable Peripheral ====

Make sure the peripheral is enabled:
  * Enable GPIOx in ''RCC->AHBENR[0]''.

==== Setup analog input mode ====

Configure the MODE register, for every pin that should act as analog input:
  * Write ''0x10'' to the corresponding fields in ''GPIOx->MODE''.
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===== Configuration Registers =====

==== GPIOx_MODER - Mode register ====

\\ {{gpio_reg_common.svg}} \\ \\

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|Pin x|11|Analog input mode|