Sun Microsystems V2.0 manual Sun Spot device libraries, Sun Spot device library, Device Interface

The libraries only use system priorities in three cases:

1.To guarantee that application threads don't run during a system operation during which the system may be in an inconsistent state.

2.To guarantee short uninterruptible periods of operation for critical hardware interaction.

3.To ensure that the attention button is recognised.

Threads are only assigned a permanent system priority to achieve 1. or 3.

The Sun SPOT device libraries

Introduction

This section describes the contents of the Sun SPOT base library, spotlib_device.jar plus

spotlib_common.jar (the source code for both is in spotlib_source.jar).

Sun SPOT device library

The library contains drivers for:

•The on-board LED

•The PIO, AIC, USART and Timer-Counter devices in the AT91 package

•The CC2420 radio chip, in the form of an IEEE 802.15.4 Physical interface

•An IEEE 802.15.4 MAC layer

•An SPI interface, used for communication with the CC2420 and off-board SPI devices

•An interface to the Sun SPOT's flash memory

It also contains:

•The basestation support code (in com.sun.spot.peripheral.basestation)

•The over-the-air (OTA) control support code (in com.sun.spot.peripheral.ota)

•The radio policy manager

•A simple on-SPOT test framework, based on junit (in com.sun.spot.testFramework)

•A framework for inter-isolate communication using a remote procedure call style (in

com.sun.spot.interisolate)

•A handler for the attention button on the edge of the device

For details about using these devices and features see the respective Java interface:

Device	Interface
LED	ILed
PIO	IAT91_PIO
AIC	IAT91_AIC
Timer-Counter	IAT91_TC
CC2420	I802_15_4_PHY
MAC layer	I802_15_4_MAC
RadioPolicyManager	IRadioPolicyManager
SPI	ISpiMaster
Flash memory	IFlashMemoryDevice
Power controller	IPowerController
OTA Command Server	OTACommandServer (class)
Attention button handler	FiqInterruptDaemon (class)

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