P1 batch translation: 94 PDFs (Communication + Diagnostics + SystemServices + MCAL)
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# AUTOSAR 时间服务需求规范 (SRS TimeService)
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> **文档元信息**
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| 项目 | 内容 |
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|------|------|
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| 文档标题 | Requirements on Time Service（时间服务需求） |
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| 文档所有者 | AUTOSAR |
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| 文档责任方 | AUTOSAR |
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| 文档标识号 | 623 |
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| 文档状态 | Final（最终版） |
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| AUTOSAR 标准分类 | Classic Platform（经典平台） |
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| 标准发布版本 | 4.4.0 |
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| 原文文档号 | AUTOSAR_SRS_TimeService |
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---
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## 文档变更历史
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| 日期 | 发布版本 | 变更人 | 变更说明 |
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|------|---------|--------|----------|
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| 2018-10-31 | 4.4.0 | AUTOSAR Release Management | 编辑性修改 |
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| 2017-12-08 | 4.3.1 | AUTOSAR Release Management | 编辑性修改 |
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| 2016-11-30 | 4.3.0 | AUTOSAR Release Management | 新增第 5 章 需求追溯 |
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| 2015-07-31 | 4.2.2 | AUTOSAR Release Management | 编辑性修改 |
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| 2014-10-31 | 4.2.1 | AUTOSAR Release Management | 链接到所有需求的新 RS_BRF_ 特性 |
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| 2013-10-31 | 4.1.2 | AUTOSAR Release Management | 编辑性修改 |
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| 2013-03-15 | 4.1.1 | AUTOSAR Administration | 初始发布 |
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---
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## 目录
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1. [本文档范围](#1-本文档范围)
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2. [使用的约定](#2-使用的约定)
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3. [功能概述](#3-功能概述)
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4. [缩略语、缩写和术语](#4-缩略语缩写和术语)
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5. [需求追溯](#5-需求追溯)
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6. [需求规范](#6-需求规范)
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- 6.1 功能需求
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7. [参考文献](#7-参考文献)
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---
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## 免责声明
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> 本节保留原文，不进行翻译。
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---
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## 1. 本文档范围
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本规范定义了 BSW 模块 Time Service 的需求。
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**约束**
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基础软件模块需求规范的首要范围是非安全相关的系统。对于安全相关系统中的基础软件模块的实现，应检查是否需要额外需求。
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---
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## 2. 使用的约定
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- AUTOSAR 文档中需求的表示遵循 [1] 指定的表格。
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- 在需求中，应使用以下特定语义（基于 IETF 的语义）：
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关键字 "MUST"、"MUST NOT"、"REQUIRED"、"SHALL"、"SHALL NOT"、"SHOULD"、"SHOULD NOT"、"RECOMMENDED"、"MAY" 和 "OPTIONAL" 的解释如下：
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- **SHALL（应当）**：该词表示相关定义是规范的绝对要求。
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- **SHALL NOT（不得）**：该短语表示相关定义是规范的绝对禁止。
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- **MUST（必须）**：该词表示相关定义是出于法律问题的绝对要求。
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- **MUST NOT（不应）**：该短语表示相关定义是出于法律约束的绝对禁止。
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- **SHOULD（建议）**：该词或形容词 "RECOMMENDED" 表示在特定环境下可能存在忽略某一项目的有效理由。
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- **SHOULD NOT（不建议）**：该短语或短语 "NOT RECOMMENDED" 表示在特定环境下某种行为可能是可接受的或甚至有用。
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- **MAY（可以）**：该词或形容词 "OPTIONAL" 表示该项目是真正可选的。
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---
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## 3. 功能概述
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Time Service 模块是服务层的一部分。该模块提供基于时间的功能服务。用例包括：
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- 时间测量
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- 基于时间的状态机
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- 超时监督
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- 忙等待
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如果硬件支持且配置启用，则有几种 "定时器类型" — 即所谓的 "Time Service Predef Timers" — 可用。
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每个 Predef Timer 具有预定义的 tick 持续时间（物理时间单位）和预定义的位数（物理范围）。通过这种方式，可确保对所有支持所需 Time Service Predef Timers 的平台的时间相关功能的兼容性。
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Time Service Predef Timers 基于所谓的 "GPT Predef Timers"，后者是由 GPT 驱动程序提供的自由运行的硬件定时器。
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所有服务都由用户调用（"轮询模式"）。不支持通知。
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Time Service 模块不使用和分发 GPT 驱动程序的所有功能。Time Service 模块不是 "定时器栈" 的顶部。
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---
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## 4. 缩略语、缩写和术语
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下表中定义的缩略语和缩写具有本文档的局部范围。
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| 缩写 | 描述 |
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|------|------|
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| **（参见下文）** | - |
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下表中定义的术语具有本文档的局部范围。
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| 术语 | 描述 |
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|------|------|
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| **GPT Predef Timer** | GPT Predef Timer 是由 GPT 驱动程序提供的自由运行的向上计数器。可用的 GPT Predef Timer 取决于硬件（时钟、硬件定时器、预分频器、定时器寄存器宽度等）和配置。GPT Predef Timer 具有预定义的物理时间单位和范围。 |
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| **Time Service Predef Timer** | Time Service Predef Timer 是具有预定义物理时间单位和范围的自由运行的向上计数器。硬件定时器功能基于相应的 GPT Predef Timer。对于每个 Predef Timer，Time Service 模块提供一组 API 服务。用户可以实例化任何定时器（仅受可用内存限制），并可以完全独立地使用各个实例。 |
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| **Timer instance（定时器实例）** | 定时器实例是 API 数据类型的数据对象。 |
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| **Reference time（参考时间）** | 参考时间为每个定时器实例存储的时间值。 |
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---
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## 5. 需求追溯
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| 需求 | 描述 | 满足于 |
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|------|------|--------|
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| RS_BRF_01056 | AUTOSAR BSW 模块应提供标准化接口 | SRS_Tm_00004, SRS_Tm_00005, SRS_Tm_00006, SRS_Tm_00007, SRS_Tm_00008 |
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| RS_BRF_01408 | AUTOSAR 应提供可从每个基础软件层访问的服务层 | SRS_Tm_00001, SRS_Tm_00002, SRS_Tm_00003, SRS_Tm_00004, SRS_Tm_00005, SRS_Tm_00006, SRS_Tm_00007, SRS_Tm_00008 |
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| RS_BRF_01468 | AUTOSAR 服务应支持用于相对时间测量的时间服务 | SRS_Tm_00001, SRS_Tm_00002, SRS_Tm_00003, SRS_Tm_00004, SRS_Tm_00005, SRS_Tm_00006, SRS_Tm_00007, SRS_Tm_00008 |
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---
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## 6. 需求规范
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### 6.1 功能需求
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#### 6.1.1 总体
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##### 6.1.1.1 [SRS_Tm_00001] Time Service 模块应支持不同类型的 Predef Timer
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```
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Type: Valid
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Description: The following types of Predef Timers shall be supported by the
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Time Service module:
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• Timer 1µs16bit
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• Timer 1µs24bit
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• Timer 1µs32bit
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• Timer 100µs32bit
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Rationale: 1µs: high resolution timer.
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16bit timer: To support 16bit hardware timers.
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24bit timer: To support 24bit hardware timers.
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32bit timer: To support 32bit hardware timers.
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100µs32bit timer: covers automotive use cases (time span
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4.9 days)
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Use Case: Time measurement, time based state machine, timeout
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supervision, busy waiting
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Dependencies: [SRS_BSW_00343] Specification and configuration of time
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Supporting Material: --
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⌋(RS_BRF_01408, RS_BRF_01468)
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```
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##### 6.1.1.2 [SRS_Tm_00002] GPT Predef Timer 应用作 Time Service 模块的 Predef Timer 的时基
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```
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Type: Valid
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Description: The GPT Predef Timers shall be used as time base for the
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Predef Timers of the Time Service module.
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Rationale: The Time Service module has to use a driver module for
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hardware access
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Use Case: Read current timer value
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Dependencies: --
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Supporting Material: --
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⌋(RS_BRF_01408, RS_BRF_01468)
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```
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#### 6.1.2 配置
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##### 6.1.2.1 [SRS_Tm_00003] Time Service 模块应能配置启用哪些 Predef Timer
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```
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Type: Valid
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Description: The Time Service module shall make it possible to configure
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which Predef Timers are enabled.
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For each enabled Predef Timer a set of API services shall be
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available:
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• Reset timer
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• Get time span
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• Shift timer
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• Synchronize timer
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• Busy waiting, only for 1µs timers
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Rationale: To disable Predef Timers if not needed or related GPT
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Predef Timers not available.
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Use Case: --
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Dependencies: --
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Supporting Material: --
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⌋(RS_BRF_01408, RS_BRF_01468)
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```
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#### 6.1.3 初始化
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（无具体需求）
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#### 6.1.4 正常运行
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##### 6.1.4.1 [SRS_Tm_00004] Time Service 模块应提供用于重置定时器实例的同步服务
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```
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Type: Valid
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Description: The Time Service module shall provide a synchronous
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service for each enabled Predef Timer, to reset a timer
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instance. By this service a reference time is set, which is
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needed for further services. The service shall have the
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following parameter:
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• Pointer to a timer instance defined by the user
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Rationale: Basic functionality.
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Due to performance reasons, this service is required for
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each Predef Timer. A pointer is used (instead of an
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identifier) for referencing a timer instance to avoid user
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dependent configuration of module Time Service. So, the
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service can be used flexibly just like a library service.
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Use Case: Time measurement, time based state machine, timeout
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supervision, busy waiting
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Dependencies: --
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Supporting Material: --
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⌋(RS_BRF_01408, RS_BRF_01056, RS_BRF_01468)
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```
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##### 6.1.4.2 [SRS_Tm_00005] Time Service 模块应提供用于获取时间跨度的同步服务
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```
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Type: Valid
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Description: The Time Service module shall provide a synchronous
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service for each enabled Predefined Timer, to get the time
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span. The time span is the time difference between the
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reference time and the current point in time.
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The service shall have the following parameter:
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• Pointer to a timer instance defined by the user
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Rationale: Basic functionality.
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Due to performance reasons, this service is required for
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each Predef Timer. A pointer is used (instead of an
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identifier) for referencing a timer instance to avoid user
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dependent configuration of module Time Service. So, the
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service can be used flexibly just like a library service.
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Use Case: Time measurement, time based state machine, timeout
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supervision, busy waiting
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Dependencies: --
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Supporting Material: --
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⌋(RS_BRF_01408, RS_BRF_01056, RS_BRF_01468)
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```
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##### 6.1.4.3 [SRS_Tm_00006] Time Service 模块应提供用于移动定时器实例参考时间的同步服务
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```
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Type: Valid
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Description: The Time Service module shall provide a synchronous
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service for each enabled Predef Timer, to shift the
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reference time of a timer instance. Shifting means to add a
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time value to the reference time to get a new reference
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time.
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The service shall have the following parameters:
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• Pointer to a timer instance defined by the user
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• Time value which has to be added to the reference
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time
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Rationale: Extended functionality.
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Due to performance reasons, this service is required for
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each Predef Timer. A pointer is used (instead of an
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identifier) for referencing a timer instance to avoid user
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dependent configuration of module Time Service. So, the
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service can be used flexibly just like a library service.
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Use Case: Measurement of the cycle time of a runnable piece of
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software without loss of accuracy
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Dependencies: --
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Supporting Material: --
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⌋(RS_BRF_01408, RS_BRF_01056, RS_BRF_01468)
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```
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##### 6.1.4.4 [SRS_Tm_00007] Time Service 模块应提供用于同步两个定时器实例的同步服务
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```
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Type: Valid
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Description: The Time Service module shall provide a synchronous
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service for each enabled Predef Timer, to synchronize
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two timer instances. Synchronization means to set the
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reference time of a timer instance "Destination" to the
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reference time of a timer instance "Source". The service
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shall have the following parameters:
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• Pointer to a destination timer instance defined by
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the user
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• Pointer to a source timer instance defined by the
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user
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Rationale: Extended functionality.
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Due to performance reasons, this service is required for
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each Predef Timer. A pointer is used (instead of an
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identifier) for referencing a timer instance to avoid user
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dependent configuration of module Time Service. So, the
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service can be used flexibly just like a library service.
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Use Case: Measurement of different time stamps (e.g. first call of
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some tasks) related to the same reference time.
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Dependencies: --
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Supporting Material: --
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⌋(RS_BRF_01408, RS_BRF_01056, RS_BRF_01468)
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```
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##### 6.1.4.5 [SRS_Tm_00008] Time Service 模块应提供 tick 持续时间为 1µs 的同步服务以通过轮询执行忙等待
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```
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Type: Valid
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Description: The Time Service module shall provide a synchronous
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service for each enabled Predef Timer with tick duration
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1µs to perform busy waiting (active waiting) by polling.
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The waiting time shall be restricted to 8 bits (255µs) to
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prevent long time blocking of code execution. The
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interrupts shall not be disabled, this means the real
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waiting time may be greater than the desired waiting
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time.
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The service shall have the following parameter:
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• Minimum waiting time
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Rationale: Extended functionality.
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Due to performance reasons, this service is required for
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each 1µs Predef Timer. The service can be used flexibly
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just like a library service.
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To reduce risk of bad implementation of busy waiting on
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user software level. To ensure correct waiting time
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independent of:
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• CPU speed
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• Pipeline effects
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• Cache effects
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• Access time to memory (bus width, wait states, ...)
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• Compiler version, compiler options, compiler
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optimizations
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Use Case: Implementation of drivers (hardware dependant waiting
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times)
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Dependencies: --
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Supporting Material: --
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⌋(RS_BRF_01408, RS_BRF_01056, RS_BRF_01468)
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```
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---
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## 7. 参考文献
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### 7.1 AUTOSAR 交付物
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- [1] Software Standardization Template, AUTOSAR_TPS_StandardizationTemplate.pdf
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---
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## 翻译说明
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- **文档类型**：AUTOSAR SRS（Software Requirements Specification，软件需求规范）
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- **翻译策略**：本 SRS 文档（13 页）规模较小，已进行完整翻译，包括所有配置、初始化、运行各阶段的需求。
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- **摘要标记位置**：
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- 第 5 章需求追溯：表格已完整翻译（3 行）
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- 文档较小，未使用"完整表见原文 PDF"摘要标记
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- **保留内容**：
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- 需求 ID（如 `SRS_Tm_00001`、`SRS_Tm_00008` 等）
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- AUTOSAR 方框符 `⌈⌋`
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- 所有 API 标识符、模块缩写（GPT、Tm）
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- 文档间交叉引用
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- **术语对照表**：
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- Time Service → 时间服务
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- Predef Timer → 预定义定时器
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- Reference Time → 参考时间
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- Timer Instance → 定时器实例
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- Tick Duration → 刻度持续时间
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- Time Span → 时间跨度
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- Busy Waiting → 忙等待
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- Polling Mode → 轮询模式
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- Synchronous Service → 同步服务
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- Shift Timer → 移动定时器
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- Synchronize Timer → 同步定时器
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- Reset Timer → 重置定时器
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- GPT Predef Timer → GPT 预定义定时器
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Reference in New Issue
Block a user