block/GPIOA:
  description: GPIOA address block description.
  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
    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
    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: GPIO port bit reset register.
    byte_offset: 40
    fieldset: BRR
fieldset/AFRH:
  description: GPIO alternate function high register.
  fields: []
fieldset/AFRL:
  description: GPIO alternate function low register.
  fields:
  - name: AFSEL
    description: Alternate function selection for port x pin y (y = 0 to 7) These bits are written by software to configure alternate function I/Os.
    bit_offset: 0
    bit_size: 4
    array:
      len: 8
      stride: 4
    enum: AFSEL
fieldset/BRR:
  description: GPIO 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: ID
    description: Port input data pin %s.
    bit_offset: 0
    bit_size: 1
    array:
      len: 16
      stride: 1
    enum: ID
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: 'Lock key This bit can be read any time. It can only be modified using the lock key write sequence. LOCK key write sequence: WR LCKR[16] = 1 + LCKR[15:0] WR LCKR[16] = 0 + LCKR[15:0] WR LCKR[16] = 1 + LCKR[15:0] RD LCKR RD LCKR[16] = 1 (this read operation is optional but it confirms that the lock is active) Note: During the LOCK key write sequence, the value of LCK[15:0] must not change. Any error in the lock sequence aborts the lock. After the first lock sequence on any bit of the port, any read access on the LCKK bit returns 1 until the next MCU reset or peripheral reset.'
    bit_offset: 16
    bit_size: 1
    enum: LCKK
fieldset/MODER:
  description: GPIO port mode register.
  fields:
  - name: MODE
    description: Port x configuration pin %s.
    bit_offset: 0
    bit_size: 2
    array:
      len: 16
      stride: 2
    enum: MODE
fieldset/ODR:
  description: GPIO port output data register.
  fields:
  - name: OD
    description: Port output data pin %s.
    bit_offset: 0
    bit_size: 1
    array:
      len: 16
      stride: 1
    enum: OD
fieldset/OSPEEDR:
  description: GPIO port output speed register.
  fields:
  - name: OSPEED
    description: Port x configuration pin %s.
    bit_offset: 0
    bit_size: 2
    array:
      len: 16
      stride: 2
    enum: OSPEED
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: PUPD
    description: Port x configuration pin %s.
    bit_offset: 0
    bit_size: 2
    array:
      len: 16
      stride: 2
    enum: PUPD
enum/AFSEL:
  bit_size: 4
  variants:
  - name: AF0
    description: AF0.
    value: 0
  - name: AF1
    description: AF1.
    value: 1
  - name: AF2
    description: AF2.
    value: 2
  - name: AF3
    description: AF3.
    value: 3
  - name: AF4
    description: AF4.
    value: 4
  - name: AF5
    description: AF5.
    value: 5
  - name: AF6
    description: AF6.
    value: 6
  - name: AF7
    description: AF7.
    value: 7
  - name: AF8
    description: AF8.
    value: 8
  - name: AF9
    description: AF9.
    value: 9
  - name: AF10
    description: AF10.
    value: 10
  - name: AF11
    description: AF11.
    value: 11
  - name: AF12
    description: AF12.
    value: 12
  - name: AF13
    description: AF13.
    value: 13
  - name: AF14
    description: AF14.
    value: 14
  - name: AF15
    description: AF15.
    value: 15
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 ODx bit.
    value: 1
enum/BSRR_BR:
  bit_size: 1
  variants:
  - name: Reset
    description: Resets the corresponding ODx bit.
    value: 1
enum/ID:
  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/MODE:
  bit_size: 2
  variants:
  - name: Input
    description: Input mode.
    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/OD:
  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/OSPEED:
  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/PUPD:
  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