【AT-START-F403A测评】之二freeRTOS系统IAR环境时钟配置及串口DMA实现完全pri...
本帖最后由 uuxz99 于 2020-10-3 21:08 编辑<p align="center" style="text-align:center"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><b><span style="font-size:14.0pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.75pt">【</span></span></span></span></span></b><b><span lang="EN-US" style="font-size:14.0pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.75pt">AT-START-F403A</span></span></span></span></span></b><b><span style="font-size:14.0pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.75pt">测评】</span></span></span></span></span></b><b><span style="font-size:14.0pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#333333">之二freeRTOS系统基于IAR环境时钟配置及串口DMA实现完全printf功能</span></span></span></span></b></span></span></span></p>
<p align="left" style="text-align:left; text-indent:24.0pt"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">通过上一次测评，仅实现了简单任务切换，任务中断机制尚未实现。本次评估实现了任务中断切换等功能。通过使用DMA及其中断机制实现完整printf功能，为了获得优良的DMA性能，先看一下时钟系统的配置。</span></span></span></span></span></p>
<p align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><b><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">时钟配置：</span></span></b></span></span></span></p>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">项目中Startup目录下system_at32f4xx.c可以实现系统时钟的配置，当然，也可以在运行时调整。评测按照最高时钟设置。</span></span></span></span></span></li>
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<p align="left" style="margin-left:28px; text-align:left; text-indent:-6.95pt"></p>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">为了便于观察配置结果，设置一个RCC_ClockType 类型全局变量systemClock，在main启动中，可以通过RCC_GetClocksFreq(&systemClock)获得系统时钟的配置情况。</span></span></span></span></span></li>
<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">启动调试断点停下后，在watch中观察变量systemClock</span></span></span></span></span></li>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">确认时钟配置</span></span></span></span></span></li>
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<p align="left" style="margin-left:28px; text-align:left; text-indent:24.0pt"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">在datasheet的RCC的CFG寄存器描述时钟输出如下，寄存器与描述实际是一致，目前配置为外部8MHz时钟为PLL时钟源，PLL时钟作为系统时钟输出240MHz。需要注意的是，如果不修改上述配置，默认是系统时钟及APB等均为8MHz。</span></span></span></span></span></p>
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<p align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><b><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">完全printf功能实现： </span></span></b></span></span></span></p>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">通过uart以DMA方式发送打印字符实现测评，基于上一篇评测（《at-start-f403a测评之一--freeRTOS系统搭建》）的三个任务，增加串口DMA打印功能，评测中命名为console功能。</span></span></span></span></span></li>
<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">实现串口DMA打印，驱动分别对gpio，串口和DMA设备的初始化。</span></span></span></span></span>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">串口gpio设备初始化</span></span></span></span></span></li>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">串口设备初始化</span></span></span></span></span></li>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">dma</span></span><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">设备初始化</span></span></span></span></span></li>
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<p align="left" style="margin-left:28px; text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"> <span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">允许RCC及DMA中断配置。</span></span></span></span></span></p>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">console</span></span><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">功能初始化</span></span></span></span></span></li>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">DMA</span></span><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">发送</span></span></span></span></span></li>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">console</span></span><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">功能实现</span></span></span></span></span></li>
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<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">在原有三个点灯任务中加入console功能实现</span></span></span></span></p>
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<li align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="layout-grid-mode:char"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"微软雅黑","sans-serif"">功能结果示例</span></span></span></span></span></li>
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<p>雅特力AT-START-F403A测评汇总</p>
<p><a href="https://bbs.eeworld.com.cn/thread-1143018-1-1.html" target="_blank">https://bbs.eeworld.com.cn/thread-1143018-1-1.html</a></p>
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