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ST STM32F31xx - GPIO Read and Write Functions

ST STM32F31xx
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General-purpose I/Os (GPIO)
UM1581
238/584
DocID023800 Rev 1
Function Description
Fills each GPIO_InitStruct member with its default value.
Parameters
GPIO_InitStruct : pointer to a GPIO_InitTypeDef structure
which will be initialized.
Return values
None.
Notes
None.
12.2.5.4 GPIO_PinLockConfig
Function Name
void GPIO_PinLockConfig ( GPIO_TypeDef * GPIOx, uint16_t
GPIO_Pin)
Function Description
Locks GPIO Pins configuration registers.
Parameters
GPIOx : where x can be (A or B or D) to select the GPIO
peripheral.
GPIO_Pin : specifies the port bit to be written. This
parameter can be any combination of GPIO_Pin_x where x
can be (0..15).
Return values
None.
Notes
The configuration of the locked GPIO pins can no longer be
modified until the next reset.
12.2.6 GPIO Read and Write functions
12.2.6.1 GPIO_ReadInputDataBit
Function Name
uint8_t GPIO_ReadInputDataBit ( GPIO_TypeDef * GPIOx,
uint16_t GPIO_Pin)
Function Description
Reads the specified input port pin.
Parameters
GPIOx : where x can be (A, B, C, D, E or F) to select the
GPIO peripheral.
GPIO_Pin : specifies the port bit to read.
Return values
The input port pin value.
Notes
This parameter can be GPIO_Pin_x where x can be : (0..15)
for GPIOA, GPIOB, GPIOC, GPIOD or GPIOE; (0..2, 4, 6,
9..10) for GPIOF.

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