TI-RTOS CC26XX电源管理指南

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"CC26XX睡眠管理是TI公司针对其CC2640和CC2642等SimpleLink微控制器系列提供的电源管理机制，旨在优化设备在不同工作模式下的功耗，以延长电池寿命。TI-RTOS 2.20版本提供了Power Manager API，该API用于静态和动态配置电源管理模式，适用于MSP432、CC13xx/CC26xx以及CC3200系列芯片。" TI-RTOS中的Power Manager API详细说明了如何管理和控制CC26XX系列芯片的电源状态。它分为以下几个部分： 1. **概述**：这部分介绍电源管理的基本概念，包括如何通过API来控制和配置微控制器的电源模式，以实现低功耗操作。 2. **定义与术语**：定义了与电源管理相关的专业术语，帮助开发者理解API的使用背景和功能。 3. **Power Manager API**：这一部分详细阐述了API的结构，包括静态配置（在编译时确定电源模式）、运行时配置（在程序运行时调整电源设置）、包含的头文件、API函数以及调试和监控工具。 4. **目标特定的电源保护**：针对CC13xx/CC26xx、CC3200和MSP432这三种不同的微控制器平台，提供了具体的电源管理策略和实现方法。例如，CC13xx/CC26xx支持多种低功耗模式，如空闲模式和深度睡眠模式，可以根据应用需求进行选择。 5. **应用开发与电源管理**：这部分指导开发者如何在实际应用中集成和利用Power Manager，包括默认的电源管理行为、初始化过程、驱动初始化、约束管理、通知机制、应用在空闲时间的管理，以及如何启用和禁用电源策略。 6. **电源管理与调试**：讨论了在开发过程中如何使用电源管理API进行调试，以确保电源策略的正确性和效率。 7. **优化电源管理**：提供了提高电源管理性能的建议，以进一步减少功耗。 8. **下一步**：鼓励开发者了解更多的电源政策和如何选择合适的策略，以适应不断变化的系统需求。 9. **电源政策**：电源政策是决定设备何时进入低功耗模式的关键。它们的目的是根据系统负载和需求自动切换电源状态，以达到最佳的能效比。开发者可以通过API自定义电源政策，以适应不同应用的具体需求。通过以上内容，开发者可以深入理解CC26XX系列芯片的电源管理机制，并有效地利用Power Manager API来设计低功耗的应用，从而实现更长时间的电池寿命。

SPRUI18C—June 2016 Power Manager API 9

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www.ti.com Power Manager API

1.3.2 Runtime Configuration

For each target, one of the configuration elements of the Power configuration structure (that is,

PowerCC3200_ConfigV1, PowerCC26XX_Config, or PowerMSP432V1_Config) is the "enablePolicy"

flag. This Boolean determines whether the configured Power policy function is called on each pass

through the Idle loop. This flag is typically set to "false" in the TI-RTOS examples. This allows the

application to be initially run in a debugger without possible side-effects due to transitions into a low-

power state. This is especially critical for CC3200 devices, because sleep transitions usually cause a

debugger detach.

The Power_enablePolicy() API allows the application to explicitly enable the policy at runtime, overriding

the setting in the static configuration structure. This allows a common board file to be used for several

applications, because individual applications can individually enable the Power policy when appropriate.

The Power_disablePolicy() API allows the application to explicitly disable the policy at runtime.

1.3.3 Include Files

To use the Power API, the application should include both the

Power.h

header file and the appropriate

device-specific Power header file. It can then call Power_enablePolicy() in main() or somewhere else in

the program. For example, use these statements for CC13xx/CC26xx:

#include <ti/drivers/Power.h>

#include <ti/drivers/power/PowerCC26XX.h>

...

Power_enablePolicy();

The device-specific header file should be included as shown above, because applications typically use

device-specific resource IDs, events, and sleep states.

1.3.4 API Functions

For API details, see the Doxygen-generated documentation. In the top-level installation directory for TI-

RTOS, open the Release Notes and follow the links to Documentation and then Documentation

Overview. In the Documentation Overview, open the TI-RTOS Drivers Runtime APIs (doxygen) link.

Select the Power.h link in the "Driver Interfaces" column, along with the device-family specific

implementation, for example

PowerCC3200.h

Note: If your code was developed using a version prior to TI-RTOS 2.15 for CC26xx, note that

some changes have been made to the Power APIs. See the TI-RTOS Migration 2.15

wiki page for details.

The following are the Power manager APIs.

•

Power_enablePolicy() enables the configured power policy function to run on each pass through

the OS Idle loop. See Section 1.3.2 and Section 3.2.

•

Power_disablePolicy() disables the configured power policy function at runtime.

•

Power_setPolicy() chooses a different power policy at runtime.

•

Power_getConstraintMask() gets a bitmask that identifies the current set of declared constraints.

See Section 3.4 and Section 4.2.3.

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•

Power_getDependencyCount() gets the number of dependencies currently declared upon a

resource. See Section 4.4.1.

•

Power_getPerformanceLevel() gets the current performance level for the device. (MSP432 only)

•

Power_getTransitionLatency() gets the minimal transition latency for a sleep state, in units of

microseconds. See Section 3.4.

•

Power_getTransitionState() gets the current Power manager transition state.

•

Power_init() is a function that needs to be called at startup to initialize the Power Manager state.

•

Power_registerNotify() registers a function to be called upon a specific power event. See Section

4.2.2, Section 4.3.1, and Section 4.4.3.

•

Power_releaseConstraint() releases a constraint that was previously set. See Section 4.2.3,

Section 4.3.2, and Section 4.4.5.

•

Power_releaseDependency() releases a dependency that was previously set. See Section 4.2.1,

Section 4.3.4, and Section 4.4.6.

•

Power_setConstraint() sets an operational constraint. See Section 4.2.3, Section 4.3.2, and

Section 4.4.2.

•

Power_setDependency() sets a dependency on a manageable resource. See Section 4.2.1,

Section 4.3.1, and Section 4.2.1.

•

Power_setPerformanceLevel() transitions the device to a new performance level. (MSP432 only)

•

Power_shutdown() puts the device into a lowest-power shutdown state.

•

Power_sleep() puts the device into a predefined sleep state. See Section 3.4 and Section 4.2.2.

•

Power_unregisterNotify() unregisters a function from event notification. See Section 4.4.7.

1.3.5 Instrumentation

The Power Manager does not log any actions or provide information to the ROV tool.

The Power Manager provides an Assert if Power_releaseConstraint() or Power_releaseDependency()

are called more times than the corresponding Power_setConstraint() or Power_setDependency() API.

There are also asserts for: an invalid sleepState for Power_sleep(), an invalid shutdownState for

Power_shutdown(), and invalid pointers for Power_registerNotify().

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