block/GPIOA:
  description: General-purpose I/Os.
  items:
  - name: MODER
    description: GPIO port mode register.
    byte_offset: 0
    fieldset: MODER
  - name: OTYPER
    description: GPIO port output type register.
    byte_offset: 4
    fieldset: OTYPER
  - name: OSPEEDR
    description: GPIO port output speed register.
    byte_offset: 8
    fieldset: OSPEEDR
  - name: PUPDR
    description: GPIO port pull-up/pull-down register.
    byte_offset: 12
    fieldset: PUPDR
  - name: IDR
    description: GPIO port input data register.
    byte_offset: 16
    access: Read
    fieldset: IDR
  - name: ODR
    description: GPIO port output data register.
    byte_offset: 20
    fieldset: ODR
  - name: BSRR
    description: GPIO port bit set/reset register.
    byte_offset: 24
    access: Write
    fieldset: BSRR
  - name: LCKR
    description: GPIO port configuration lock register.
    byte_offset: 28
    fieldset: LCKR
  - name: AFRL
    description: GPIO alternate function low register.
    byte_offset: 32
    fieldset: AFRL
  - name: AFRH
    description: GPIO alternate function high register.
    byte_offset: 36
    fieldset: AFRH
  - name: BRR
    description: port bit reset register.
    byte_offset: 40
    access: Write
    fieldset: BRR
fieldset/AFRH:
  description: GPIO alternate function high register.
  fields: []
fieldset/AFRL:
  description: GPIO alternate function low register.
  fields:
  - name: AFR
    description: Alternate function selection for port x bit y (y = 0..7).
    bit_offset: 0
    bit_size: 4
    array:
      len: 8
      stride: 4
fieldset/BRR:
  description: port bit reset register.
  fields:
  - name: BR
    description: Port x reset pin %s.
    bit_offset: 0
    bit_size: 1
    array:
      len: 16
      stride: 1
    enum: BRR_BR
fieldset/BSRR:
  description: GPIO port bit set/reset register.
  fields:
  - name: BS
    description: Port x set pin %s.
    bit_offset: 0
    bit_size: 1
    array:
      len: 16
      stride: 1
    enum: BS
  - name: BR
    description: Port x reset pin %s.
    bit_offset: 16
    bit_size: 1
    array:
      len: 16
      stride: 1
    enum: BSRR_BR
fieldset/IDR:
  description: GPIO port input data register.
  fields:
  - name: IDR
    description: Port input data pin %s.
    bit_offset: 0
    bit_size: 1
    array:
      len: 16
      stride: 1
    enum: IDR
fieldset/LCKR:
  description: GPIO port configuration lock register.
  fields:
  - name: LCK
    description: Port x lock pin %s.
    bit_offset: 0
    bit_size: 1
    array:
      len: 16
      stride: 1
    enum: LCK
  - name: LCKK
    description: Port x lock bit y (y= 0..15).
    bit_offset: 16
    bit_size: 1
    enum: LCKK
fieldset/MODER:
  description: GPIO port mode register.
  fields:
  - name: MODER
    description: Port x configuration pin %s.
    bit_offset: 0
    bit_size: 2
    array:
      len: 16
      stride: 2
    enum: MODER
fieldset/ODR:
  description: GPIO port output data register.
  fields:
  - name: ODR
    description: Port output data pin %s.
    bit_offset: 0
    bit_size: 1
    array:
      len: 16
      stride: 1
    enum: ODR
fieldset/OSPEEDR:
  description: GPIO port output speed register.
  fields:
  - name: OSPEEDR
    description: Port x configuration pin %s.
    bit_offset: 0
    bit_size: 2
    array:
      len: 16
      stride: 2
    enum: OSPEEDR
fieldset/OTYPER:
  description: GPIO port output type register.
  fields:
  - name: OT
    description: Port x configuration pin %s.
    bit_offset: 0
    bit_size: 1
    array:
      len: 16
      stride: 1
    enum: OT
fieldset/PUPDR:
  description: GPIO port pull-up/pull-down register.
  fields:
  - name: PUPDR
    description: Port x configuration pin %s.
    bit_offset: 0
    bit_size: 2
    array:
      len: 16
      stride: 2
    enum: PUPDR
enum/BRR_BR:
  bit_size: 1
  variants:
  - name: NoAction
    description: No action on the corresponding ODx bit.
    value: 0
  - name: Reset
    description: Reset the ODx bit.
    value: 1
enum/BS:
  bit_size: 1
  variants:
  - name: Set
    description: Sets the corresponding ODRx bit.
    value: 1
enum/BSRR_BR:
  bit_size: 1
  variants:
  - name: Reset
    description: Resets the corresponding ODRx bit.
    value: 1
enum/IDR:
  bit_size: 1
  variants:
  - name: Low
    description: Input is logic low.
    value: 0
  - name: High
    description: Input is logic high.
    value: 1
enum/LCK:
  bit_size: 1
  variants:
  - name: Unlocked
    description: Port configuration not locked.
    value: 0
  - name: Locked
    description: Port configuration locked.
    value: 1
enum/LCKK:
  bit_size: 1
  variants:
  - name: NotActive
    description: Port configuration lock key not active.
    value: 0
  - name: Active
    description: Port configuration lock key active.
    value: 1
enum/MODER:
  bit_size: 2
  variants:
  - name: Input
    description: Input mode (reset state).
    value: 0
  - name: Output
    description: General purpose output mode.
    value: 1
  - name: Alternate
    description: Alternate function mode.
    value: 2
  - name: Analog
    description: Analog mode.
    value: 3
enum/ODR:
  bit_size: 1
  variants:
  - name: Low
    description: Set output to logic low.
    value: 0
  - name: High
    description: Set output to logic high.
    value: 1
enum/OSPEEDR:
  bit_size: 2
  variants:
  - name: LowSpeed
    description: Low speed.
    value: 0
  - name: MediumSpeed
    description: Medium speed.
    value: 1
  - name: HighSpeed
    description: High speed.
    value: 2
  - name: VeryHighSpeed
    description: Very high speed.
    value: 3
enum/OT:
  bit_size: 1
  variants:
  - name: PushPull
    description: Output push-pull (reset state).
    value: 0
  - name: OpenDrain
    description: Output open-drain.
    value: 1
enum/PUPDR:
  bit_size: 2
  variants:
  - name: Floating
    description: No pull-up, pull-down.
    value: 0
  - name: PullUp
    description: Pull-up.
    value: 1
  - name: PullDown
    description: Pull-down.
    value: 2