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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/mem/d13x-mem-3-sram.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">SRAM</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
|
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/shortdesc shortdesc"></p><p class="- topic/p p" data-ofbid="d217554e20__20250121171645">对于没有 SiP PSRAM 颗粒和 PSRAM Memory 空间的部分 型号，如需使用多媒体模块 DE/ GE/ VE
|
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，必须使能 SRAM_S1 区域。SRAM_S1 区域可以被 DE/GE/VE 硬件访问，但其空间需要从 SRAM_S0 中划分。</p><p class="- topic/p p" data-ofbid="d217554e22__20250121171645">SRAM 配置和<a class="- topic/xref xref" href="d13x-mem-1-sram-psram.html">SRAM + PSRAM</a> 配置区别是用 SRAM_S1 取代 PSRAM 来充当 CMA
|
||
区域，本节仅描述两者的差异部分。</p><section class="- topic/section section" id="d13x-mem-3-sram__section_hg5_zpj_bdc" data-ofbid="d13x-mem-3-sram__section_hg5_zpj_bdc"><h2 class="- topic/title title sectiontitle">内存布局和使用策略</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d217554e33__20250121171645">
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="d13x-mem-3-sram__image_nrn_gcd_bdc" src="../../../images/memory/d13x_mem_layout3.png" alt="d13x_mem_layout3"/></div><br/>
|
||
</div>
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<p class="- topic/p p" data-ofbid="d217554e40__20250121171645">如图所示，针对 SRAM_S1 Memory 资源，软件会使用以下策略来进行分配：</p>
|
||
<ul class="- topic/ul ul simple" id="d13x-mem-3-sram__ul_orn_gcd_bdc" data-ofbid="d13x-mem-3-sram__ul_orn_gcd_bdc"><li class="- topic/li li" data-ofbid="d217554e44__20250121171645">
|
||
<div class="- topic/p p" data-ofbid="d217554e46__20250121171645">将 SRAM_S1 分成两个区域： <ul class="- topic/ul ul" id="d13x-mem-3-sram__ul_qth_rbk_bdc" data-ofbid="d13x-mem-3-sram__ul_qth_rbk_bdc"><li class="- topic/li li" data-ofbid="d217554e49__20250121171645"><code class="+ topic/ph pr-d/codeph ph codeph">SRAM_S1 Software Region</code>：在 SRAM_S0
|
||
不够系统软件用的情况下补充划分一部分 SRAM_S1 给软件使用。</li><li class="- topic/li li" data-ofbid="d217554e53__20250121171645"><code class="+ topic/ph pr-d/codeph ph codeph">SRAM_S1 CMA Region</code>：专供多媒体模块 MPP 使用</li></ul></div>
|
||
</li><li class="- topic/li li" data-ofbid="d217554e58__20250121171645">
|
||
<div class="- topic/p p" data-ofbid="d217554e60__20250121171645">将每个 <span class="+ topic/keyword pr-d/parmname keyword parmname">Region</span> 进一步划分成以下子区域：<ul class="- topic/ul ul" id="d13x-mem-3-sram__ul_sd4_tzj_bdc" data-ofbid="d13x-mem-3-sram__ul_sd4_tzj_bdc"><li class="- topic/li li" data-ofbid="d217554e66__20250121171645">静态分配 <span class="+ topic/keyword pr-d/parmname keyword parmname">Static</span>：编译链接后可确认地址。</li><li class="- topic/li li" data-ofbid="d217554e71__20250121171645">动态分配 <span class="+ topic/keyword pr-d/parmname keyword parmname">Heap</span>：Heap 内存池运行时确定地址。</li></ul></div>
|
||
</li></ul>
|
||
<div class="- topic/p p" data-ofbid="d217554e78__20250121171645">综合上述策略，SRAM_S1 空间被软件划分成四块区域：<ul class="- topic/ul ul" id="d13x-mem-3-sram__ul_prn_gcd_bdc" data-ofbid="d13x-mem-3-sram__ul_prn_gcd_bdc"><li class="- topic/li li" data-ofbid="d217554e81__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217554e83__20250121171645"><code class="+ topic/ph pr-d/codeph ph codeph">SRAM_S1 SW Static</code>：系统静态分配区域，属于可选区域，通常情况下未配置。</p>
|
||
<p class="- topic/p p" data-ofbid="d217554e88__20250121171645">如需链接到此区域，可在函数定义和全局变量定义中加入 <span class="+ topic/keyword pr-d/parmname keyword parmname">SRAM1_SW_DATA_DEFINE</span> 宏声明：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="d13x-mem-3-sram__codeblock_uw5_mpj_bdc" data-ofbid="d13x-mem-3-sram__codeblock_uw5_mpj_bdc"><em class="hl-comment">// 函数定义：</em>
|
||
<strong class="hl-keyword">void</strong> SRAM1_SW_DATA_DEFINE test_func(<strong class="hl-keyword">void</strong>);
|
||
|
||
<em class="hl-comment">// 全局变量定义：</em>
|
||
SRAM1_SW_DATA_DEFINE <strong class="hl-keyword">int</strong> a = <span class="hl-number">1</span>;</pre>
|
||
</li><li class="- topic/li li" data-ofbid="d217554e97__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217554e99__20250121171645"><code class="+ topic/ph pr-d/codeph ph codeph">SRAM_S1 SW Heap</code>：系统动态分配区域，即
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">heap_sram1_sw</code> 内存池，属于可选区域，通常情况下未配置。</p>
|
||
<p class="- topic/p p" data-ofbid="d217554e107__20250121171645">使用以下函数，可从该内存池分配内存：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="d13x-mem-3-sram__codeblock_a2w_mpj_bdc" data-ofbid="d13x-mem-3-sram__codeblock_a2w_mpj_bdc">aicos_malloc(MEM_SRAM1_SW, size);</pre>
|
||
</li><li class="- topic/li li" data-ofbid="d217554e113__20250121171645">
|
||
<div class="- topic/p p" data-ofbid="d217554e115__20250121171645"><code class="+ topic/ph pr-d/codeph ph codeph">SRAM_S1 CMA Static</code>：CMA 静态分配区域，属于可选区域，通常情况下未配置。<ul class="- topic/ul ul" id="d13x-mem-3-sram__ul_b2j_ldn_mdc" data-ofbid="d13x-mem-3-sram__ul_b2j_ldn_mdc"><li class="- topic/li li" data-ofbid="d217554e120__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217554e122__20250121171645">当 SRAM_S0 空间不够用时，通过 <code class="+ topic/ph pr-d/codeph ph codeph">menuconfig</code> 配置菜单，将
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">.text</span>、<span class="+ topic/keyword pr-d/parmname keyword parmname">.rodata</span>、<span class="+ topic/keyword pr-d/parmname keyword parmname">.data</span>
|
||
和 <span class="+ topic/keyword pr-d/parmname keyword parmname">.bss</span> 放置到 PSRAM 中，可链接到本区域。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d217554e140__20250121171645">
|
||
<div class="- topic/p p" data-ofbid="d217554e142__20250121171645">如需链接到此区域，可在函数定义和全局变量定义中加入 <span class="+ topic/keyword pr-d/parmname keyword parmname">CMA_DATA_DEFINE</span>
|
||
宏声明：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="d13x-mem-3-sram__codeblock_urn_gcd_bdc" data-ofbid="d13x-mem-3-sram__codeblock_urn_gcd_bdc"><em class="hl-comment">// 函数定义：</em>
|
||
<strong class="hl-keyword">void</strong> CMA_DATA_DEFINE test_func(<strong class="hl-keyword">void</strong>); <em class="hl-comment">// CMA_DATA_DEFINE = SRAM1_CMA_DATA_DEFINE</em>
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||
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||
<em class="hl-comment">// 全局变量定义：</em>
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||
CMA_DATA_DEFINE <strong class="hl-keyword">int</strong> a = <span class="hl-number">1</span>;</pre></div>
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||
</li></ul></div>
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</li><li class="- topic/li li" data-ofbid="d217554e151__20250121171645">
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<p class="- topic/p p" data-ofbid="d217554e153__20250121171645"><code class="+ topic/ph pr-d/codeph ph codeph">SRAM_S1 CMA Heap</code>：CMA 动态分配区域，即 <span class="+ topic/keyword pr-d/parmname keyword parmname">heap_cma</span>
|
||
内存池</p>
|
||
<p class="- topic/p p" data-ofbid="d217554e161__20250121171645">使用以下函数,，可从该内存池分配内存。</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="d13x-mem-3-sram__codeblock_rl1_npj_bdc" data-ofbid="d13x-mem-3-sram__codeblock_rl1_npj_bdc">aicos_malloc(MEM_CMA, size); <em class="hl-comment">// MEM_CMA = MEM_SRAM1_CMA</em></pre>
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||
</li></ul></div>
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</section><section class="- topic/section section" id="d13x-mem-3-sram__id16" data-ofbid="d13x-mem-3-sram__id16"><h2 class="- topic/title title sectiontitle">参数配置</h2>
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||
<div class="- topic/p p" data-ofbid="d217554e173__20250121171645">通过 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span> 命令进入 menuconfig
|
||
配置界面，配置下列 Meomry
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||
相关参数：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="d13x-mem-3-sram__codeblock_rpw_yxm_mdc" data-ofbid="d13x-mem-3-sram__codeblock_rpw_yxm_mdc">Board options --->
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||
Mem Options ---></pre></div>
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<ul class="- topic/ul ul" id="d13x-mem-3-sram__ul_zrn_gcd_bdc" data-ofbid="d13x-mem-3-sram__ul_zrn_gcd_bdc"><li class="- topic/li li" data-ofbid="d217554e182__20250121171645">
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<p class="- topic/p p" data-ofbid="d217554e184__20250121171645">SRAM_S1 总大小</p>
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||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="d13x-mem-3-sram__codeblock_nyc_npj_bdc" data-ofbid="d13x-mem-3-sram__codeblock_nyc_npj_bdc">SRAM parameter --->
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||
(<span class="hl-number">0x100000</span>) SRAM Total Size <em class="hl-comment">// 配置 SRAM 总大小为 1M</em>
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SRAM_S1 Size (<span class="hl-number">512</span>K) <em class="hl-comment">// 配置 SRAM_S1 大小为 512k，SRAM_S0 大小即为剩下的 512k</em>
|
||
( ) <span class="hl-number">0</span>K
|
||
( ) <span class="hl-number">128</span>K
|
||
( ) <span class="hl-number">256</span>K
|
||
( ) <span class="hl-number">384</span>K
|
||
(X) <span class="hl-number">512</span>K
|
||
( ) <span class="hl-number">640</span>K</pre>
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</li><li class="- topic/li li" data-ofbid="d217554e190__20250121171645">
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<p class="- topic/p p" data-ofbid="d217554e192__20250121171645">SRAM_S1 CMA 区域大小</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="d13x-mem-3-sram__codeblock_kd2_npj_bdc" data-ofbid="d13x-mem-3-sram__codeblock_kd2_npj_bdc">SRAM parameter --->
|
||
(<span class="hl-number">0x0</span>) Software size in SRAM_S1 <em class="hl-comment">// 配置 SRAM_S1 开头 Software 区域大小为 0，剩余结尾 CMA 区域大小即为 512k</em></pre>
|
||
</li><li class="- topic/li li" data-ofbid="d217554e198__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217554e200__20250121171645"><span class="+ topic/keyword pr-d/parmname keyword parmname">.text</span>、<span class="+ topic/keyword pr-d/parmname keyword parmname">.rodata</span>、<span class="+ topic/keyword pr-d/parmname keyword parmname">.data</span> 和
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">.bss</span> 区域可选择配置到 SRAM_S0/SRAM_S1 中：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="d13x-mem-3-sram__codeblock_h3f_npj_bdc" data-ofbid="d13x-mem-3-sram__codeblock_h3f_npj_bdc">ELF Sections memory locatio --->
|
||
Section .text (SRAM_S0) --->
|
||
Section .rodata (SRAM_S0) --->
|
||
Section .data (SRAM_S0) --->
|
||
Section .bss (SRAM_S1) --->
|
||
( ) SRAM_S0
|
||
(X) SRAM_S1 <em class="hl-comment">// 在 SRAM_S0 空间不足的情况下，选择把部分数据存放到 SRAM_S1 当中</em></pre>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#d13x-mem-3-sram__section_hg5_zpj_bdc" data-tocid="d13x-mem-3-sram__section_hg5_zpj_bdc">内存布局和使用策略</a></div></li><li class="section-item"><div class="section-title"><a href="#d13x-mem-3-sram__id16" data-tocid="d13x-mem-3-sram__id16">参数配置</a></div></li></ul></div>
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</div>
|
||
|
||
|
||
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
|
||
|
||
|
||
</body>
|
||
</html> |