---
block/GPIO:
  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: AFR
      description: "GPIO alternate function registers. The register described in the datasheet as AFRL is index 0 in this array, and AFRH is index 1. Note that when operating on AFRH, you need to subtract 8 from any operations on the field array it contains -- the alternate function for pin 9 is at index 1, for instance."
      array:
        len: 2
        stride: 4
      byte_offset: 32
      fieldset: AFR
fieldset/AFR:
  description: 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).
  fields:
    - name: AFR
      description: Alternate function selection for one of the pins controlled by this register (0-7).
      bit_offset: 0
      bit_size: 4
      array:
        len: 8
        stride: 4
fieldset/BSRR:
  description: GPIO port bit set/reset register
  fields:
    - name: BS
      description: Port x set bit y (y= 0..15)
      bit_offset: 0
      bit_size: 1
      array:
        len: 16
        stride: 1
    - name: BR
      description: Port x set bit y (y= 0..15)
      bit_offset: 16
      bit_size: 1
      array:
        len: 16
        stride: 1
fieldset/IDR:
  description: GPIO port input data register
  fields:
    - name: IDR
      description: Port input data (y = 0..15)
      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 bit y (y= 0..15)
      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 bits (y = 0..15)
      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 (y = 0..15)
      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 bits (y = 0..15)
      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 bits (y = 0..15)
      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 bits (y = 0..15)
      bit_offset: 0
      bit_size: 2
      array:
        len: 16
        stride: 2
      enum: PUPDR
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