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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
Read time: 1 minute(s)
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<section class="- topic/section section" id="tsensor_key_procedures__section_bzm_bct_c1c" data-ofbid="tsensor_key_procedures__section_bzm_bct_c1c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
<div class="- topic/p p" data-ofbid="d186387e38__20250123155220">TSensor 模块完全遵循 driver 的通用初始化流程,申请 regs 资源、clk、reset另外需要使用 Thermal 子系统的注册接口
thermal_zone_device_register() 来注册 zone
设备。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="tsensor_key_procedures__codeblock_btj_cct_c1c" data-ofbid="tsensor_key_procedures__codeblock_btj_cct_c1c"><code><strong class="hl-keyword">struct</strong> thermal_zone_device *thermal_zone_device_register(<strong class="hl-keyword">const</strong> <strong class="hl-keyword">char</strong> *,
<strong class="hl-keyword">int</strong>, <strong class="hl-keyword">int</strong>, <strong class="hl-keyword">void</strong> *, <strong class="hl-keyword">struct</strong> thermal_zone_device_ops *,
<strong class="hl-keyword">struct</strong> thermal_zone_params *, <strong class="hl-keyword">int</strong>, <strong class="hl-keyword">int</strong>);</code></pre></div>
<div class="- topic/p p" data-ofbid="d186387e43__20250123155220">其中关键参数有设备名称、zone 设备的 ops、以及私有数据等ops 中我们暂时只提供 get_temp()
接口的定义:<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="tsensor_key_procedures__codeblock_xby_cct_c1c" data-ofbid="tsensor_key_procedures__codeblock_xby_cct_c1c"><code><strong class="hl-keyword">static</strong> <strong class="hl-keyword">struct</strong> thermal_zone_device_ops tsen_cpu_ops = {
.get_temp = tsen_cpu_get_temp,
};
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">struct</strong> thermal_zone_device_ops tsen_adc_ops = {
.get_temp = tsen_adc_get_temp,
};</code></pre></div>
</section>
<section class="- topic/section section" id="tsensor_key_procedures__section_x4q_dct_c1c" data-ofbid="tsensor_key_procedures__section_x4q_dct_c1c"><h2 class="- topic/title title sectiontitle">中断处理流程</h2>
<p class="- topic/p p" data-ofbid="d186387e54__20250123155220">在中断处理函数中,可以通过私有数据来传递 zone 设备信息,从中获取到到该通道对应的寄存器基地址,就可以读到相应的报警状态。</p>
<p class="- topic/p p" data-ofbid="d186387e57__20250123155220">TSensor 支持使用中断方式来读取数据,避免应用层的忙等待。</p>
<figure class="- topic/fig fig fignone" id="tsensor_key_procedures__fig_fmc_fct_c1c" data-ofbid="tsensor_key_procedures__fig_fmc_fct_c1c">
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="tsensor_key_procedures__image_pth_2ct_c1c" src="../../../images/ths/tsen_irq_flow1.png" width="432" alt="tsen_irq_flow1"/></div><br/>
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label"><span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">TSensor 非周期模式的数据采集流程</span></figcaption></figure>
<ul class="- topic/ul ul simple" id="tsensor_key_procedures__ul_wfk_ywh_bdc" data-ofbid="tsensor_key_procedures__ul_wfk_ywh_bdc">
<li class="- topic/li li" data-ofbid="d186387e74__20250123155220">
<p class="- topic/p p" data-ofbid="d186387e76__20250123155220">对于非周期模式的数据采集流程:</p>
<ol class="- topic/ol ol" id="tsensor_key_procedures__ul_jsc_lsg_ddc" data-ofbid="tsensor_key_procedures__ul_jsc_lsg_ddc">
<li class="- topic/li li" data-ofbid="d186387e81__20250123155220">用户层触发
ops→fetch_data() 接口,就会启动一次硬件去读数据。</li>
<li class="- topic/li li" data-ofbid="d186387e88__20250123155220">当硬件准备好数据,会产生一个中断,通知系统数据已经准备好可以读取。</li>
<li class="- topic/li li" data-ofbid="d186387e91__20250123155220">中断处理函数会响应该中断信号。在中断处理函数中,用 <span class="+ topic/keyword pr-d/parmname keyword parmname">INT Flag</span>
来区分是哪个通道有数据。</li>
<li class="- topic/li li" data-ofbid="d186387e97__20250123155220">中断处理函数会逐个通道扫描,将每个通道的数据读出,并将数据缓存到一个全局变量中,供后续的用户层应用访问和使用。</li>
</ol>
</li>
<li class="- topic/li li" data-ofbid="d186387e102__20250123155220">
<div class="- topic/p p" data-ofbid="d186387e104__20250123155220">对于周期模式: <ol class="- topic/ol ol" id="tsensor_key_procedures__ol_etn_zsg_ddc" data-ofbid="tsensor_key_procedures__ol_etn_zsg_ddc">
<li class="- topic/li li" data-ofbid="d186387e108__20250123155220">TSensor 控制器自动按给定周期产生一次数据中断。例如,如果设定周期为 1 秒,则每 1 秒就会触发一次中断。</li>
<li class="- topic/li li" data-ofbid="d186387e111__20250123155220">中断处理函数会响应该中断信号,并通过 <code class="+ topic/ph pr-d/codeph ph codeph">INT Flag</code> 来区分是哪个通道有数据。</li>
<li class="- topic/li li" data-ofbid="d186387e117__20250123155220">中断处理函数会逐个通道扫描,将每个通道的数据读出,并缓存到全局变量中,供后续的用户层应用访问和使用。</li>
</ol></div>
</li>
</ul>
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