GPIO

General-Purpose Input/Outputs (GPIO) Peripheral Driver. More...

Collaboration diagram for GPIO:

Modules
	xGPIO
	CoX GPIO Peripheral Interface.

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Detailed Description

General-Purpose Input/Outputs (GPIO) Peripheral Driver.

General Purpose Input/Output (a.k.a. GPIO) is a generic pin on a mcu whose behavior (including whether it is an input or output pin) can be controlled (programmed) through software.

Always an I/O line may be dedicated as a general-purpose I/O or be assigned to a function of an embedded peripheral.

An I/O line Can also pend an interrupt when detect rising edge, falling edge, low level or high level.

Contents

• 1. GPIO Physical Block
• 2. GPIO Functional Description
  • 2.1 GPIO Data Control
    • 2.1.1 GPIO Data Direction
    • 2.1.2 GPIO Data Input/Output
  • 2.2 GPIO Input Edge/Level Interrupt
  • 2.3 GPIO AFIO Control
  • 2.4 GPIO Pad Control
• 3. GPIO Applications

1. GPIO Physical Block

2. GPIO Functional Description

2.1 GPIO Data Control

2.1.1 GPIO Data Direction

The GPIO Control can configure each individual pin as :

• Input
• Output
• Peripheral Function

2.1.2 GPIO Data Input/Output

Software Can drive the I/O line to High Level(digital 0) or Low Level(digital 0) when config as Output, or
sample the pin value when config as output.

2.2 GPIO Input Edge/Level Interrupt

The PIO Controller can be programmed to generate an interrupt when it detects an edge or a level on an I/O line.

The Interrupt mode can be:

• Rising Edge Detection
• Falling Edge Detection
• Both Edge Detection
• Low Level Detection
• High Level Detection
• Both Level Dectection

2.3 GPIO AFIO Control

There is always an Alternate function I/O configuration (AFIO) to optimize the number of peripherals available for the various kinds of package. Highly flexible pin muxing allows use as GPIO or one of several peripheral functions.

2.4 GPIO Pad Control

The pad control registers allow software to configure the GPIO pads based on the application requirements. It contains:

• control drive strength
• open-drain configuration
• pull-up and pull-down resistors

3. GPIO Applications

The PIO can be used to read button state, drive LED, etc.

Note:

Here describes the common function of the GPIO Peripheral. The CoX Peripheral Interface is base on the functions above.