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Miscellaneous device drivers

UM0851

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Doc ID 16604 Rev 2

Miscellaneous device drivers

9.1

General purpose I/O (GPIO) driver

This section describes the the GPIO capabilities of the SPEAr embedded MPU family.

9.1.1

Hardware overview

A "General Purpose Input/Output" (GPIO) is a flexible software-controlled digital signal.

Each GPIO represents a bit connected to a particular pin, or "ball" on Ball Grid Array (BGA)

packages. Each input/output can be controlled in two distinct modes:

●

Software mode, through an APB interface.

●

Hardware mode, through a hardware control interface.

The GPIO IP used in the SPEAr family is an ARM PL061 GPIO. SPEAr3xx contains one

PL061 instance and SPEAr600 contains four PL061 instances (two local GPIOs in CPU

subsystem, one GPIO in the application subsystem and one in the basic subsystem).

The main features of the ARM PL061 GPIO are:

●

Eight individually programmable input/output pins (default to input at reset)

●

Programmable interrupt generation capability on any number of pins (edge and level

interrupts).

Figure 57.

GPIO block diagram

The GPIO pin numbers are different in SPEAr3xx and SPEAr600. Refer to Table 53 and

Table 54.

GPIO pin numbers are different in case of SPEAr3xx and SPEAr600.

Input/

output

control

Mode

control

multiplexer

Interrupt

control

AMBA APB interface

Hardware

control

interface

Input/output

multiplexer

Interrupt detection

logic

Enable lines

Output data

Input data

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