Hal Gpio Generic Driver; Gpio Firmware Driver Registers Structures; Gpio_Inittypedef; Gpio Peripheral Features - ST STM32F2 User Manual

UM1940
20

HAL GPIO Generic Driver

20.1

GPIO Firmware driver registers structures

20.1.1

GPIO_InitTypeDef

Data Fields
uint32_t Pin
uint32_t Mode
uint32_t Pull
uint32_t Speed
uint32_t Alternate
Field Documentation
uint32_t GPIO_InitTypeDef::Pin
Specifies the GPIO pins to be configured. This parameter can be any value of
GPIO_pins_define
uint32_t GPIO_InitTypeDef::Mode
Specifies the operating mode for the selected pins. This parameter can be a value of
GPIO_mode_define
uint32_t GPIO_InitTypeDef::Pull
Specifies the Pull-up or Pull-Down activation for the selected pins. This parameter can
be a value of
uint32_t GPIO_InitTypeDef::Speed
Specifies the speed for the selected pins. This parameter can be a value of
GPIO_speed_define
uint32_t GPIO_InitTypeDef::Alternate
Peripheral to be connected to the selected pins. This parameter can be a value of
GPIO_Alternate_function_selection
20.2

GPIO Firmware driver API description

20.2.1

GPIO Peripheral features

Subject to the specific hardware characteristics of each I/O port listed in the datasheet,
each port bit of the General Purpose IO (GPIO) Ports, can be individually configured by
software in several modes:
Input mode
Analog mode
Output mode
Alternate function mode
External interrupt/event lines
During and just after reset, the alternate functions and external interrupt lines are not
active and the I/O ports are configured in input floating mode.
All GPIO pins have weak internal pull-up and pull-down resistors, which can be activated
or not.
In Output or Alternate mode, each IO can be configured on open-drain or push-pull type
and the IO speed can be selected depending on the VDD value.
GPIO_pull_define
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HAL GPIO Generic Driver
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