Module regs

Structs

• Afr
  GPIO alternate function register. This contains an array of 8 fields, which correspond to pins 0-7 of the port (for AFRL) or pins 8-15 of the port (for AFRH).
• Brr
  port bit reset register.
• Bsrr
  GPIO port bit set/reset register.
• Idr
  GPIO port input data register.
• Lckr
  GPIO port configuration lock register.
• Moder
  GPIO port mode register.
• Odr
  GPIO port output data register.
• Ospeedr
  GPIO port output speed register.
• Otyper
  GPIO port output type register.
• Pupdr
  GPIO port pull-up/pull-down register.