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UM0097

Peripheral firmware overview

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3.5.3

Firmware library functions

Table 33 enumerates the different functions of the GPIO library.

GPIO_Config

Note:

When you change a port pin mode, the other port pins modes stay unchanged.

You can configure more than one pin of the same GPIO peripheral. It is not possible to

configure pins of more than one GPIO peripheral at the same call of GPIO_Config function.

Moreover it is not possible to configure more than one pin of the same GPIO peripheral in

more than one mode by calling once the GPIO_Config function.

Table 33.

GPIO library functions

Function Name

Description

GPIO_Config

Configures the selected GPIO I/O pins according to the input

passed in parameter

GPIO_BitRead

Returns a port pin value depending on the input passed parameters

GPIO_ByteRead

Reads the specified data port byte (upper or lower eight bits) and

returns its value

GPIO_WordRead

Reads the specified data port and returns its value

GPIO_BitWrite

Sets or clears the selected data port bit

GPIO_ByteWrite

Writes a byte value into the selected port register byte (upper or lower

eight bits)

GPIO_WordWrite

Writes a word value into the selected port register

Function Name

GPIO_Config

Function Prototype

void GPIO_Config (GPIO_TypeDef *GPIOx,

u16 Port_Pins, GpioPinMode_TypeDef GPIO_Mode);

Behavior Description

Configures the selected GPIO I/O pins according to the input passed

parameters. Refer to the datasheet for more details on input modes,

output modes and port names.

Input Parameter 1

GPIOx: selects the port to be configured. x can be 0, 1 or 2. Refer to

GPIOx values on page 68 for details on the allowed values of this

parameter.

Input Parameter 2

Port_Pins: this parameter specifies the port pin placement. You can

select more than one pin. Refer to Port pin values on page 68 for more

details on the allowed values of this parameter.

Input Parameter 3

GPIO_Mode: specifies the pin mode. Refer to GPIO pin mode

enumeration on page 67 for more information on the allowed values of

this parameter.

Output Parameter

None

Return Value

None

Required preconditions

None

Called Functions

None

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