Kinetis V2.0 Bootloader详解：功能与协议指南

需积分: 10 168 浏览量更新于2024-07-18 收藏 2.49MB PDF 举报

本参考手册详细介绍了Kinetis Bootloader v2.0.0的特性、工作原理和协议，适用于Freescale Semiconductor的Kinetis系列微控制器。该版本的Bootloader是针对Kinetis芯片设计的一种固件加载器，旨在简化应用软件的部署和更新过程。在第一章"Introduction"中，手册首先概述了Bootloader的作用，强调了它作为一个系统启动的关键组件，支持多种功能，包括引导过程、内存映射以及应用程序完整性检查。其中，完整性检查机制通过两个阶段确保系统的安全：首先是Bootloader初始化，接着根据检查结果决定是否留在Bootloader模式还是进入应用运行状态。第二章"Functional description"深入探讨了Bootloader的工作流程。它描绘了Bootloader的内存布局，特别是Kinetis Bootloader Configuration Area (BCA)，这是存储配置信息和命令处理的地方。章节还解释了Bootloader如何配置时钟，以及它的入口点。此外，着重讲解了应用完整性检查过程，涉及了Bootloader与应用软件交互的逻辑，确保只有合法的应用才能被加载。第三章"Kinetis bootloader protocol"主要阐述了Bootloader与外部设备通信的协议。这部分涵盖了三种命令类型：无数据阶段的命令、接收到数据阶段的命令以及不需要返回数据的命令。这些命令构成了Bootloader与外部设备如开发工具进行交互的基础，用于执行各种操作，如固件下载、升级和状态查询。第四章"Bootloader packet types"详细介绍了Bootloader支持的数据包类型，包括ping packet（用于检测连接和确认Bootloader的存在）和ping response（对ping请求的确认）。这些数据包在Bootloader与外部设备的通信过程中起着至关重要的作用。 Kinetis Bootloader v2.0.0 Reference Manual为开发者提供了一个全面的指南，帮助他们理解和使用这个强大的工具来管理和更新Kinetis系列微控制器的应用程序。理解并遵循手册中的内容，能够有效地管理设备的固件更新，提高开发效率和系统安全性。

tag is incorrect, the configuration values are set to default, as if the data was all 0xFF

bytes.

3. Clocks are configured.

4. Enabled peripherals are initialized.

5. The the bootloader waits for communication to begin on a peripheral.

• If detection times out, the bootloader jumps to the user application in flash if the

valid PC and SP addresses are specified in the application vector table.

• If communication is detected, all inactive peripherals are shut down, and the

command phase is entered.

Start-up process

Kinetis Bootloader v2.0.0 Reference Manual, Rev. 0, 04/2016

16 Freescale Semiconductor, Inc.

2.5 Clock configuration

The clock configuration used by the bootloader depends on the clock settings in the

bootloader configuration area and the requirements of the enabled peripherals. The

bootloader starts by using the default clock configuration of the part out of reset.

• Alternate clock configurations are supported by setting fields in the bootloader

configuration data.

• If the HighSpeed flag of the clockFlags configuration value is cleared, the core and

bus clock frequencies are determined by the clockDivider configuration value.

• The core clock divider is set directly from the inverted value of clockDivider, unless

a USB peripheral is enabled. If a USB peripheral is enabled and clockDivider is

greater than 2, clockDivider is reduced to 2 in order to keep the CPU clock above 20

MHz.

• The bus clock divider is set to 1, unless the resulting bus clock frequency is greater

than the maximum supported value. In this instance, the bus clock divider is

increased until the bus clock frequency is at or below the maximum.

• The flash clock divider is set to 1, unless the resulting flash clock frequency is

greater than the maximum supported value. In this instance, the flash clock divider is

increased until the flash clock frequency is at or below the maximum.

• If flex bus is available, the flex bus clock divider is set to 1, unless the resulting flex

bus clock frequency is greater than the maximum supported value. In this instance,

the flex bus clock divider is increased until the flex bus clock frequency is at or

below the maximum.

• If a USB peripheral is enabled, the IRC48Mhz clock is selected as the USB

peripheral clock and the clock recovery feature is enabled.

• Note that the maximum baud rate of serial peripherals is related to the core and bus

clock frequencies.

• Note that the bootloader code does not always configure the device core clock to run

at 48 MHz. For devices with no USB peripheral and when HighSpeed flag is not

enabled in the BCA, the core clock is configured to run at default clock rate (i.e.,

20.9 MHz). This is also true for devices with USB but HighSpeed flag is not enabled

in the BCA.

2.6 Bootloader entry point

The Kinetis bootloader provides a function (runBootloader) that a user application can

call, to run the bootloader.

Clock configuration

Kinetis Bootloader v2.0.0 Reference Manual, Rev. 0, 04/2016

18 Freescale Semiconductor, Inc.

剩余169页未读，继续阅读

flydog嵌入式

粉丝: 1
资源: 2

Kinetis V2.0 Bootloader详解：功能与协议指南

飞思卡尔 bootloader PPT及相关实验

飞思卡尔Kinetis K60 固件库系列例程35-串口Bootloader下位机程序(V2.40版本)

NXP_Kinetis_Bootloader_2_0_0

kinetis_keaxx_dfp

bootloader例程

CodeWarrior PA V8.8

SPI HDR ERR

nxp的MCUBootUtility的下载地址

常见的MCU有哪些类型

支持双备份ota升级的mcu

最新资源