{"id":74332,"date":"2026-02-09T17:26:55","date_gmt":"2026-02-09T09:26:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/74332.html"},"modified":"2026-02-09T17:26:55","modified_gmt":"2026-02-09T09:26:55","slug":"zynq-pl%e4%b8%8eps%e7%ab%af%e9%ab%98%e6%95%88%e6%95%b0%e6%8d%ae%e4%ba%a4%e4%ba%92%ef%bc%9adma%e9%a9%b1%e5%8a%a8%e4%b8%8e%e4%b8%ad%e6%96%ad%e6%9c%ba%e5%88%b6%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/74332.html","title":{"rendered":"ZYNQ--PL\u4e0ePS\u7aef\u9ad8\u6548\u6570\u636e\u4ea4\u4e92\uff1aDMA\u9a71\u52a8\u4e0e\u4e2d\u65ad\u673a\u5236\u8be6\u89e3"},"content":{"rendered":"<h3>1. ZYNQ PL\u4e0ePS\u6570\u636e\u4ea4\u4e92\u7684\u6838\u5fc3\u4ef7\u503c<\/h3>\n<p>\u5728\u6211\u591a\u5e74\u7684ZYNQ\u5f00\u53d1\u7ecf\u5386\u4e2d&#xff0c;\u6700\u8ba9\u4eba\u5174\u594b\u7684\u5c31\u662f\u770b\u5230PL\u548cPS\u4e24\u4e2a\u90e8\u5206\u5b8c\u7f8e\u534f\u540c\u5de5\u4f5c\u7684\u65f6\u523b\u3002ZYNQ\u82af\u7247\u7684\u72ec\u7279\u4e4b\u5904\u5728\u4e8e\u5b83\u5c06ARM\u5904\u7406\u7cfb\u7edf&#xff08;PS&#xff09;\u548cFPGA\u53ef\u7f16\u7a0b\u903b\u8f91&#xff08;PL&#xff09;\u96c6\u6210\u5728\u540c\u4e00\u82af\u7247\u4e0a&#xff0c;\u8fd9\u79cd\u67b6\u6784\u4e3a\u9ad8\u6027\u80fd\u6570\u636e\u5904\u7406\u63d0\u4f9b\u4e86\u65e0\u9650\u53ef\u80fd\u3002<\/p>\n<p>\u60f3\u8c61\u4e00\u4e0b\u8fd9\u6837\u7684\u573a\u666f&#xff1a;PS\u7aef\u5c31\u50cf\u662f\u4e00\u4e2a\u806a\u660e\u4f46\u5fd9\u788c\u7684\u529e\u516c\u5ba4\u6587\u5458&#xff0c;\u80fd\u591f\u5904\u7406\u590d\u6742\u7684\u51b3\u7b56\u548c\u4efb\u52a1\u8c03\u5ea6&#xff0c;\u4f46\u5f53\u9762\u5bf9\u5927\u91cf\u6570\u636e\u642c\u8fd0\u8fd9\u79cd\u91cd\u590d\u6027\u5de5\u4f5c\u65f6\u5c31\u4f1a\u6548\u7387\u4f4e\u4e0b\u3002\u800cPL\u7aef\u5219\u50cf\u662f\u4e00\u4e2a\u4e0d\u77e5\u75b2\u5026\u7684\u642c\u8fd0\u5de5&#xff0c;\u80fd\u591f\u4ee5\u6781\u9ad8\u7684\u901f\u5ea6\u5904\u7406\u6570\u636e\u6d41&#xff0c;\u4f46\u4e0d\u64c5\u957f\u505a\u590d\u6742\u51b3\u7b56\u3002DMA&#xff08;\u76f4\u63a5\u5185\u5b58\u8bbf\u95ee&#xff09;\u63a7\u5236\u5668\u5c31\u662f\u8ba9\u8fd9\u4e24\u4e2a\u89d2\u8272\u5b8c\u7f8e\u914d\u5408\u7684\u5173\u952e\u2014\u2014\u5b83\u8ba9&#034;\u642c\u8fd0\u5de5&#034;\u76f4\u63a5\u4e0e\u5185\u5b58\u6253\u4ea4\u9053&#xff0c;\u89e3\u653e\u4e86&#034;\u6587\u5458&#034;\u53bb\u5904\u7406\u66f4\u91cd\u8981\u7684\u4efb\u52a1\u3002<\/p>\n<p>\u6211\u7ecf\u5386\u8fc7\u5f88\u591a\u9879\u76ee&#xff0c;\u4ece\u9ad8\u901f\u6570\u636e\u91c7\u96c6\u5230\u5b9e\u65f6\u89c6\u9891\u5904\u7406&#xff0c;\u771f\u6b63\u4f53\u4f1a\u5230DMA\u914d\u5408\u4e2d\u65ad\u673a\u5236\u5e26\u6765\u7684\u6027\u80fd\u63d0\u5347\u3002\u6709\u4e00\u6b21\u505a\u9ad8\u901fADC\u6570\u636e\u91c7\u96c6&#xff0c;\u6700\u521d\u91c7\u7528PS\u7aef\u76f4\u63a5\u642c\u8fd0\u6570\u636e\u7684\u65b9\u5f0f&#xff0c;CPU\u5360\u7528\u7387\u9ad8\u8fbe80%\u4e14\u4ecd\u7136\u4e22\u5305\u3002\u5f15\u5165DMA\u540e&#xff0c;CPU\u5360\u7528\u7387\u964d\u523015%\u4ee5\u4e0b&#xff0c;\u6570\u636e\u541e\u5410\u91cf\u53cd\u800c\u63d0\u5347\u4e863\u500d\u591a\u3002\u8fd9\u79cd\u8f6c\u53d8\u8ba9\u6211\u6df1\u523b\u8ba4\u8bc6\u5230DMA\u5728ZYNQ\u7cfb\u7edf\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h3>2. DMA\u5de5\u4f5c\u539f\u7406\u4e0e\u914d\u7f6e\u8be6\u89e3<\/h3>\n<h4>2.1 DMA\u6838\u5fc3\u6982\u5ff5\u89e3\u6790<\/h4>\n<p>DMA\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u4e13\u95e8\u8d1f\u8d23\u6570\u636e\u642c\u8fd0\u7684\u534f\u5904\u7406\u5668&#xff0c;\u5b83\u7684\u8bbe\u8ba1\u7406\u5ff5\u5f88\u7b80\u5355&#xff1a;\u8ba9\u4e13\u4e1a\u7684\u4eba\u505a\u4e13\u4e1a\u7684\u4e8b\u3002CPU\u64c5\u957f\u903b\u8f91\u5904\u7406&#xff0c;\u4f46\u4e0d\u9002\u5408\u505a\u5927\u91cf\u7684\u6570\u636e\u62f7\u8d1d\u5de5\u4f5c\u3002DMA\u63a7\u5236\u5668\u5c31\u662f\u4e13\u95e8\u4f18\u5316\u7528\u4e8e\u6570\u636e\u4f20\u8f93\u7684\u786c\u4ef6\u6a21\u5757\u3002<\/p>\n<p>\u5728ZYNQ\u4e2d&#xff0c;DMA\u63a7\u5236\u5668\u901a\u8fc7AXI\u603b\u7ebf\u4e0e\u7cfb\u7edf\u8fde\u63a5\u3002\u8fd9\u91cc\u6709\u4e2a\u91cd\u8981\u7ec6\u8282&#xff1a;DMA\u4e0ePS\u7aef\u7684\u5185\u5b58\u4ea4\u4e92\u901a\u5e38\u4f7f\u7528HP&#xff08;\u9ad8\u6027\u80fd&#xff09;\u7aef\u53e3&#xff0c;\u56e0\u4e3aHP\u7aef\u53e3\u4e13\u4e3a\u5927\u6570\u636e\u91cf\u4f20\u8f93\u8bbe\u8ba1&#xff0c;\u800c\u914d\u7f6e\u5bc4\u5b58\u5668\u5219\u4f7f\u7528GP&#xff08;\u901a\u7528&#xff09;\u7aef\u53e3\u3002\u8fd9\u79cd\u5206\u5de5\u786e\u4fdd\u4e86\u6570\u636e\u901a\u8def\u548c\u914d\u7f6e\u901a\u8def\u4e0d\u4f1a\u76f8\u4e92\u5e72\u6270\u3002<\/p>\n<p>\u6211\u8bb0\u5f97\u7b2c\u4e00\u6b21\u914d\u7f6eDMA\u65f6&#xff0c;\u5bf9MM2S&#xff08;Memory to Stream&#xff09;\u548cS2MM&#xff08;Stream to Memory&#xff09;\u7684\u65b9\u5411\u603b\u662f\u641e\u6df7\u3002\u540e\u6765\u6211\u603b\u7ed3\u4e86\u4e00\u4e2a\u8bb0\u5fc6\u6280\u5de7&#xff1a;MM2S\u662f\u4ece\u5185\u5b58\u5230\u6d41&#xff0c;\u4e5f\u5c31\u662f\u4ecePS\u5230PL&#xff1b;S2MM\u662f\u4ece\u6d41\u5230\u5185\u5b58&#xff0c;\u5373\u4ecePL\u5230PS\u3002\u8fd9\u4e2a\u65b9\u5411\u6027\u5728\u914d\u7f6e\u65f6\u975e\u5e38\u91cd\u8981&#xff0c;\u4e00\u65e6\u5f04\u53cd\u4e86\u6570\u636e\u6d41\u5411\u5c31\u5b8c\u5168\u9519\u4e86\u3002<\/p>\n<h4>2.2 DMA\u63a7\u5236\u5668\u914d\u7f6e\u5b9e\u6218<\/h4>\n<p>DMA\u7684\u914d\u7f6e\u9075\u5faa\u4e00\u5957\u6807\u51c6\u7684\u6d41\u7a0b&#xff0c;\u8fd9\u5957\u6d41\u7a0b\u5728\u6211\u591a\u4e2a\u9879\u76ee\u4e2d\u90fd\u9a8c\u8bc1\u8fc7\u5176\u53ef\u9760\u6027\u3002\u9996\u5148\u9700\u8981\u901a\u8fc7\u67e5\u627e\u914d\u7f6e\u6765\u521d\u59cb\u5316DMA\u63a7\u5236\u5668&#xff1a;<\/p>\n<p>XAxiDma_Config *DmaConfig &#061; XAxiDma_LookupConfig(DEVICE_ID);<br \/>\nif (!DmaConfig) {<br \/>\n    xil_printf(&#034;No DMA config found for ID %d\\\\r\\\\n&#034;, DEVICE_ID);<br \/>\n    return XST_FAILURE;<br \/>\n}<\/p>\n<p>int Status &#061; XAxiDma_CfgInitialize(&amp;AxiDma, DmaConfig);<br \/>\nif (Status !&#061; XST_SUCCESS) {<br \/>\n    xil_printf(&#034;DMA initialization failed: %d\\\\r\\\\n&#034;, Status);<br \/>\n    return XST_FAILURE;<br \/>\n}<\/p>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u4e2d&#xff0c;XAxiDma_LookupConfig\u51fd\u6570\u4f1a\u6839\u636e\u8bbe\u5907ID\u67e5\u627e\u5bf9\u5e94\u7684\u786c\u4ef6\u914d\u7f6e&#xff0c;\u8fd9\u662f\u4e0e\u786c\u4ef6\u8bbe\u8ba1\u5bf9\u63a5\u7684\u5173\u952e\u6b65\u9aa4\u3002\u6bcf\u4e2aDMA\u63a7\u5236\u5668\u5728\u786c\u4ef6\u8bbe\u8ba1\u4e2d\u90fd\u6709\u552f\u4e00\u7684ID&#xff0c;\u8fd9\u4e2aID\u9700\u8981\u5728Vivado\u4e2d\u914d\u7f6e\u65f6\u786e\u5b9a\u3002<\/p>\n<p>\u914d\u7f6e\u5b8c\u6210\u540e&#xff0c;\u6211\u4eec\u9700\u8981\u68c0\u67e5DMA\u7684\u5de5\u4f5c\u6a21\u5f0f\u3002ZYNQ\u7684DMA\u652f\u6301\u7b80\u5355\u6a21\u5f0f&#xff08;Simple&#xff09;\u548c\u6563\u5c04\u805a\u96c6\u6a21\u5f0f&#xff08;SG&#xff09;&#xff0c;\u5bf9\u4e8e\u5927\u591a\u6570\u5e94\u7528\u6765\u8bf4&#xff0c;\u7b80\u5355\u6a21\u5f0f\u5c31\u8db3\u591f\u4e86&#xff1a;<\/p>\n<p>if (XAxiDma_HasSg(&amp;AxiDma)) {<br \/>\n    xil_printf(&#034;Device configured in SG mode, but simple mode required\\\\r\\\\n&#034;);<br \/>\n    return XST_FAILURE;<br \/>\n}<\/p>\n<p>\u5728\u5b9e\u9645\u9879\u76ee\u4e2d&#xff0c;\u6211\u5efa\u8bae\u59cb\u7ec8\u6dfb\u52a0\u8fd9\u4e2a\u68c0\u67e5&#xff0c;\u56e0\u4e3a\u6a21\u5f0f\u4e0d\u5339\u914d\u4f1a\u5bfc\u81f4\u96be\u4ee5\u8c03\u8bd5\u7684\u95ee\u9898\u3002\u6709\u4e00\u6b21\u6211\u82b1\u4e86\u6574\u6574\u4e00\u5929\u65f6\u95f4\u8c03\u8bd5\u4e00\u4e2aDMA\u4f20\u8f93\u95ee\u9898&#xff0c;\u6700\u540e\u53d1\u73b0\u5c31\u662f\u56e0\u4e3a\u6a21\u5f0f\u4e0d\u5339\u914d\u5bfc\u81f4\u7684\u3002<\/p>\n<h3>3. \u4e2d\u65ad\u673a\u5236\u8bbe\u8ba1\u4e0e\u4f18\u5316<\/h3>\n<h4>3.1 \u4e2d\u65ad\u7cfb\u7edf\u521d\u59cb\u5316<\/h4>\n<p>\u4e2d\u65ad\u662fDMA\u4f20\u8f93\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u7ec4\u6210\u90e8\u5206&#xff0c;\u5b83\u8ba9CPU\u4ece\u8f6e\u8be2\u7b49\u5f85\u4e2d\u89e3\u653e\u51fa\u6765\u3002ZYNQ\u7684\u4e2d\u65ad\u7cfb\u7edf\u57fa\u4e8eGIC&#xff08;\u901a\u7528\u4e2d\u65ad\u63a7\u5236\u5668&#xff09;&#xff0c;\u9700\u8981\u6b63\u786e\u521d\u59cb\u5316\u624d\u80fd\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n<p>\u4e2d\u65ad\u521d\u59cb\u5316\u5305\u62ec\u51e0\u4e2a\u5173\u952e\u6b65\u9aa4&#xff1a;\u9996\u5148\u521d\u59cb\u5316GIC\u63a7\u5236\u5668&#xff0c;\u7136\u540e\u8bbe\u7f6e\u5f02\u5e38\u5904\u7406&#xff0c;\u6700\u540e\u5c06DMA\u4e2d\u65ad\u4e0eGIC\u8fde\u63a5\u8d77\u6765\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u770b\u4f3c\u590d\u6742&#xff0c;\u4f46\u4e00\u65e6\u7406\u89e3\u5176\u539f\u7406\u5c31\u5f88\u5bb9\u6613\u638c\u63e1&#xff1a;<\/p>\n<p>\/\/ GIC\u63a7\u5236\u5668\u521d\u59cb\u5316<br \/>\nXScuGic_Config *GicConfig &#061; XScuGic_LookupConfig(INTC_DEVICE_ID);<br \/>\nXScuGic_CfgInitialize(&amp;Intc, GicConfig, GicConfig-&gt;CpuBaseAddress);<\/p>\n<p>\/\/ \u8bbe\u7f6e\u5f02\u5e38\u5904\u7406<br \/>\nXil_ExceptionInit();<br \/>\nXil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,<br \/>\n    (Xil_ExceptionHandler)XScuGic_InterruptHandler, &amp;Intc);<br \/>\nXil_ExceptionEnable();<\/p>\n<p>\/\/ \u8fde\u63a5DMA\u4e2d\u65ad<br \/>\nXScuGic_Connect(&amp;Intc, TX_INTR_ID,<br \/>\n    (Xil_ExceptionHandler)XAxiDma_IntrHandler, &amp;AxiDma);<br \/>\nXScuGic_Connect(&amp;Intc, RX_INTR_ID,<br \/>\n    (Xil_ExceptionHandler)XAxiDma_IntrHandler, &amp;AxiDma);<\/p>\n<p>\u8fd9\u91cc\u6709\u4e2a\u91cd\u8981\u7ec6\u8282&#xff1a;TX_INTR_ID\u548cRX_INTR_ID\u5206\u522b\u5bf9\u5e94\u53d1\u9001\u548c\u63a5\u6536\u4e2d\u65ad\u53f7&#xff0c;\u8fd9\u4e9b\u4e2d\u65ad\u53f7\u9700\u8981\u5728Vivado\u4e2d\u914d\u7f6e\u786c\u4ef6\u65f6\u786e\u5b9a\u3002\u6211\u5efa\u8bae\u5728\u786c\u4ef6\u8bbe\u8ba1\u9636\u6bb5\u5c31\u89c4\u5212\u597d\u4e2d\u65ad\u53f7\u7684\u4f7f\u7528&#xff0c;\u907f\u514d\u51b2\u7a81\u3002<\/p>\n<h4>3.2 \u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\u8bbe\u8ba1<\/h4>\n<p>\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f&#xff08;ISR&#xff09;\u7684\u8bbe\u8ba1\u76f4\u63a5\u5f71\u54cd\u7cfb\u7edf\u7684\u5b9e\u65f6\u6027\u548c\u7a33\u5b9a\u6027\u3002\u4e00\u4e2a\u597d\u7684ISR\u5e94\u8be5\u5c3d\u53ef\u80fd\u77ed\u5c0f\u7cbe\u608d&#xff0c;\u53ea\u505a\u6700\u5fc5\u8981\u7684\u5de5\u4f5c&#xff0c;\u5176\u4ed6\u5904\u7406\u53ef\u4ee5\u653e\u5230\u4e3b\u5faa\u73af\u4e2d\u5b8c\u6210\u3002<\/p>\n<p>\u5728\u6211\u7684\u5b9e\u8df5\u4e2d&#xff0c;\u901a\u5e38\u4f1a\u5728ISR\u4e2d\u8bbe\u7f6e\u6807\u5fd7\u4f4d&#xff0c;\u7136\u540e\u5728\u4e3b\u5faa\u73af\u4e2d\u68c0\u67e5\u8fd9\u4e9b\u6807\u5fd7\u4f4d\u5e76\u8fdb\u884c\u76f8\u5e94\u5904\u7406&#xff1a;<\/p>\n<p>void DmaIntrHandler(void *CallbackRef)<br \/>\n{<br \/>\n    XAxiDma *DmaInst &#061; (XAxiDma *)CallbackRef;<br \/>\n    u32 IrqStatus &#061; XAxiDma_IntrGetIrq(DmaInst, XAXIDMA_DEVICE_TO_DMA);<br \/>\n    u32 Acknowledge &#061; 0;<\/p>\n<p>    \/\/ \u68c0\u67e5\u4f20\u8f93\u5b8c\u6210\u4e2d\u65ad<br \/>\n    if (IrqStatus &amp; XAXIDMA_IRQ_IOC_MASK) {<br \/>\n        RxDone &#061; 1;<br \/>\n        Acknowledge |&#061; XAXIDMA_IRQ_IOC_MASK;<br \/>\n    }<\/p>\n<p>    \/\/ \u68c0\u67e5\u9519\u8bef\u4e2d\u65ad<br \/>\n    if (IrqStatus &amp; XAXIDMA_IRQ_ERROR_MASK) {<br \/>\n        Error &#061; 1;<br \/>\n        Acknowledge |&#061; XAXIDMA_IRQ_ERROR_MASK;<br \/>\n    }<\/p>\n<p>    \/\/ \u6e05\u9664\u4e2d\u65ad<br \/>\n    XAxiDma_IntrAckIrq(DmaInst, Acknowledge, XAXIDMA_DEVICE_TO_DMA);<br \/>\n}<\/p>\n<p>\u8fd9\u79cd\u8bbe\u8ba1\u907f\u514d\u4e86\u5728ISR\u4e2d\u6267\u884c\u8017\u65f6\u64cd\u4f5c&#xff0c;\u786e\u4fdd\u4e86\u7cfb\u7edf\u7684\u5b9e\u65f6\u54cd\u5e94\u3002\u6211\u66fe\u7ecf\u5728\u4e00\u4e2a\u89c6\u9891\u5904\u7406\u9879\u76ee\u4e2d\u56e0\u4e3aISR\u4e2d\u5904\u7406\u4e86\u592a\u591a\u903b\u8f91&#xff0c;\u5bfc\u81f4\u7cfb\u7edf\u9891\u7e41\u4e22\u5e27\u3002\u540e\u6765\u5c06\u5904\u7406\u903b\u8f91\u79fb\u5230\u4e3b\u5faa\u73af\u540e&#xff0c;\u7cfb\u7edf\u7a33\u5b9a\u6027\u5927\u5e45\u63d0\u5347\u3002<\/p>\n<h3>4. \u5b9e\u6218\u6848\u4f8b&#xff1a;\u9ad8\u901f\u6570\u636e\u91c7\u96c6\u7cfb\u7edf<\/h3>\n<h4>4.1 \u7cfb\u7edf\u67b6\u6784\u8bbe\u8ba1<\/h4>\n<p>\u8ba9\u6211\u5206\u4eab\u4e00\u4e2a\u771f\u5b9e\u9879\u76ee\u4e2d\u7684\u6848\u4f8b&#xff1a;\u9ad8\u901f\u6570\u636e\u91c7\u96c6\u7cfb\u7edf\u3002\u8fd9\u4e2a\u7cfb\u7edf\u9700\u8981\u5b9e\u65f6\u91c7\u96c6ADC\u6570\u636e&#xff0c;\u8fdb\u884c\u9884\u5904\u7406\u540e\u4f20\u8f93\u5230DDR\u5185\u5b58\u4e2d&#xff0c;\u4f9bPS\u7aef\u8fdb\u4e00\u6b65\u5904\u7406\u3002<\/p>\n<p>\u7cfb\u7edf\u786c\u4ef6\u67b6\u6784\u5305\u62ec&#xff1a;PL\u7aef\u7684ADC\u63a5\u53e3\u6a21\u5757\u3001\u6570\u636e\u9884\u5904\u7406\u6a21\u5757\u3001DMA\u63a7\u5236\u5668\u548cFIFO\u7f13\u5b58&#xff1b;PS\u7aef\u8d1f\u8d23DMA\u63a7\u5236\u3001\u4e2d\u65ad\u5904\u7406\u548c\u6570\u636e\u5206\u6790\u3002\u8fd9\u79cd\u67b6\u6784\u5145\u5206\u53d1\u6325\u4e86PL\u548cPS\u7684\u5404\u81ea\u4f18\u52bf&#xff1a;PL\u5904\u7406\u9ad8\u901f\u6570\u636e\u6d41&#xff0c;PS\u5904\u7406\u590d\u6742\u7b97\u6cd5\u548c\u7cfb\u7edf\u63a7\u5236\u3002<\/p>\n<p>\u6570\u636e\u6d41\u5411\u8bbe\u8ba1\u4e3a&#xff1a;ADC\u6570\u636e \u2192 PL\u9884\u5904\u7406 \u2192 FIFO\u7f13\u5b58 \u2192 DMA\u4f20\u8f93 \u2192 DDR\u5185\u5b58\u3002FIFO\u5728\u8fd9\u91cc\u8d77\u5230\u5173\u952e\u4f5c\u7528&#xff0c;\u5b83\u7f13\u51b2\u4e86\u6570\u636e\u751f\u4ea7&#xff08;ADC\u91c7\u96c6&#xff09;\u548c\u6d88\u8d39&#xff08;DMA\u4f20\u8f93&#xff09;\u4e4b\u95f4\u7684\u901f\u5ea6\u5dee\u5f02&#xff0c;\u9632\u6b62\u6570\u636e\u4e22\u5931\u3002<\/p>\n<h4>4.2 \u6027\u80fd\u4f18\u5316\u6280\u5de7<\/h4>\n<p>\u5728\u8fd9\u4e2a\u9879\u76ee\u4e2d&#xff0c;\u6211\u4eec\u9047\u5230\u4e86\u6027\u80fd\u74f6\u9888&#xff0c;\u901a\u8fc7\u4e00\u7cfb\u5217\u4f18\u5316\u6700\u7ec8\u8fbe\u5230\u4e86\u8bbe\u8ba1\u8981\u6c42\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5b9e\u8df5\u8bc1\u660e\u6709\u6548\u7684\u4f18\u5316\u6280\u5de7&#xff1a;<\/p>\n<p>\u7f13\u5b58\u5bf9\u9f50\u4f18\u5316&#xff1a;\u786e\u4fddDMA\u7f13\u51b2\u533a\u5730\u5740\u4e0e\u7f13\u5b58\u884c\u5bf9\u9f50&#xff0c;\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u4f20\u8f93\u6548\u7387\u3002\u6211\u4eec\u4f7f\u752864\u5b57\u8282\u5bf9\u9f50\u7684\u7f13\u51b2\u533a\u540e&#xff0c;\u4f20\u8f93\u901f\u5ea6\u63d0\u5347\u4e86\u7ea620%\u3002<\/p>\n<p>\/\/ 64\u5b57\u8282\u5bf9\u9f50\u7684\u5185\u5b58\u5206\u914d<br \/>\n#define CACHE_ALIGN 64<br \/>\nu8 *TxBuffer &#061; (u8 *)memalign(CACHE_ALIGN, BUFFER_SIZE);<\/p>\n<p>\u6279\u91cf\u4f20\u8f93\u4f18\u5316&#xff1a;\u5c3d\u53ef\u80fd\u4f7f\u7528\u6700\u5927\u7684\u4f20\u8f93\u957f\u5ea6&#xff0c;\u51cf\u5c11\u4f20\u8f93\u6b21\u6570\u3002DMA\u4f20\u8f93\u6709\u56fa\u5b9a\u7684\u542f\u52a8\u5f00\u9500&#xff0c;\u5355\u6b21\u4f20\u8f93\u6570\u636e\u91cf\u8d8a\u5927&#xff0c;\u6548\u7387\u8d8a\u9ad8\u3002<\/p>\n<p>\u4e2d\u65ad\u5408\u5e76\u5904\u7406&#xff1a;\u5bf9\u4e8e\u9ad8\u901f\u6570\u636e\u4f20\u8f93&#xff0c;\u53ef\u4ee5\u8003\u8651\u5408\u5e76\u591a\u4e2a\u6570\u636e\u5305\u7684\u4e2d\u65ad&#xff0c;\u51cf\u5c11\u4e2d\u65ad\u5904\u7406\u9891\u7387\u3002\u4f46\u9700\u8981\u6743\u8861\u5b9e\u65f6\u6027\u548c\u7cfb\u7edf\u5f00\u9500\u3002<\/p>\n<p>\u7ecf\u8fc7\u8fd9\u4e9b\u4f18\u5316&#xff0c;\u6211\u4eec\u7684\u7cfb\u7edf\u80fd\u591f\u7a33\u5b9a\u5904\u7406100MB\/s\u7684\u6301\u7eed\u6570\u636e\u6d41&#xff0c;CPU\u5360\u7528\u7387\u4fdd\u6301\u572820%\u4ee5\u4e0b\u3002\u8fd9\u4e2a\u6848\u4f8b\u5145\u5206\u5c55\u793a\u4e86DMA\u548c\u4e2d\u65ad\u673a\u5236\u5728\u9ad8\u6548\u6570\u636e\u4ea4\u4e92\u4e2d\u7684\u4ef7\u503c\u3002<\/p>\n<h3>5. \u5e38\u89c1\u95ee\u9898\u4e0e\u8c03\u8bd5\u6280\u5de7<\/h3>\n<h4>5.1 DMA\u4f20\u8f93\u6545\u969c\u6392\u67e5<\/h4>\n<p>\u5728DMA\u5f00\u53d1\u8fc7\u7a0b\u4e2d&#xff0c;\u7ecf\u5e38\u4f1a\u9047\u5230\u5404\u79cd\u4f20\u8f93\u95ee\u9898\u3002\u6839\u636e\u6211\u7684\u7ecf\u9a8c&#xff0c;\u5927\u591a\u6570\u95ee\u9898\u90fd\u53ef\u4ee5\u901a\u8fc7\u7cfb\u7edf\u5316\u7684\u65b9\u6cd5\u89e3\u51b3\u3002<\/p>\n<p>\u9996\u5148\u68c0\u67e5DMA\u63a7\u5236\u5668\u7684\u72b6\u6001\u5bc4\u5b58\u5668&#xff1a;XAxiDma_ReadReg\u51fd\u6570\u53ef\u4ee5\u8bfb\u53d6\u5185\u90e8\u5bc4\u5b58\u5668\u72b6\u6001&#xff0c;\u5e2e\u52a9\u5b9a\u4f4d\u95ee\u9898\u3002\u5e38\u89c1\u7684\u72b6\u6001\u68c0\u67e5\u5305\u62ec\u4f20\u8f93\u5b8c\u6210\u72b6\u6001\u3001\u9519\u8bef\u72b6\u6001\u548c\u7a7a\u95f2\u72b6\u6001\u3002<\/p>\n<p>\u5176\u6b21\u9a8c\u8bc1\u5185\u5b58\u5730\u5740\u548c\u957f\u5ea6\u53c2\u6570&#xff1a;\u786e\u4fdd\u4f20\u8f93\u5730\u5740\u662f\u7269\u7406\u5730\u5740&#xff08;\u975e\u865a\u62df\u5730\u5740&#xff09;&#xff0c;\u4e14\u957f\u5ea6\u6ca1\u6709\u8d8a\u754c\u3002\u6211\u66fe\u7ecf\u9047\u5230\u4e00\u4e2a\u8be1\u5f02\u7684\u95ee\u9898&#xff0c;\u6700\u7ec8\u53d1\u73b0\u662f\u56e0\u4e3a\u5730\u5740\u53c2\u6570\u4f7f\u7528\u4e86\u865a\u62df\u5730\u5740\u800c\u975e\u7269\u7406\u5730\u5740\u3002<\/p>\n<p>DMA\u6545\u969c\u6392\u67e5\u6e05\u5355&#xff1a;<\/p>\n<ul>\n<li>\u786e\u8ba4DMA\u63a7\u5236\u5668\u521d\u59cb\u5316\u6210\u529f<\/li>\n<li>\u68c0\u67e5\u4f20\u8f93\u5730\u5740\u548c\u957f\u5ea6\u53c2\u6570<\/li>\n<li>\u9a8c\u8bc1\u4e2d\u65ad\u914d\u7f6e\u548c\u8fde\u63a5<\/li>\n<li>\u786e\u8ba4\u5185\u5b58\u7f13\u5b58\u4e00\u81f4\u6027\u5904\u7406&#xff08;Flush\/Invalidate&#xff09;<\/li>\n<li>\u68c0\u67e5\u786c\u4ef6\u8fde\u63a5\u548c\u5730\u5740\u6620\u5c04<\/li>\n<\/ul>\n<h4>5.2 \u6027\u80fd\u74f6\u9888\u5206\u6790<\/h4>\n<p>\u5f53\u7cfb\u7edf\u6027\u80fd\u8fbe\u4e0d\u5230\u9884\u671f\u65f6&#xff0c;\u9700\u8981\u7cfb\u7edf\u6027\u5730\u5206\u6790\u74f6\u9888\u6240\u5728\u3002\u6211\u901a\u5e38\u91c7\u7528\u81ea\u4e0a\u800c\u4e0b\u7684\u5206\u6790\u65b9\u6cd5&#xff1a;\u5148\u4ece\u6574\u4f53\u7cfb\u7edf metrics&#xff0c;\u9010\u6b65\u6df1\u5165\u5230\u5177\u4f53\u6a21\u5757\u3002<\/p>\n<p>\u4f7f\u7528\u6027\u80fd\u8ba1\u6570\u5668&#xff1a;ZYNQ\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6027\u80fd\u8ba1\u6570\u5668\u548c&#xff0c;\u53ef\u4ee5\u76d1\u63a7AXI\u603b\u7ebf\u5229\u7528\u7387\u3001DMA\u4f20\u8f93\u6548\u7387\u7b49\u5173\u952e\u6307\u6807\u3002\u8fd9\u4e9b\u6570\u636e\u5bf9\u4e8e\u5b9a\u4f4d\u6027\u80fd\u74f6\u9888\u6781\u5176\u6709\u4ef7\u503c\u3002<\/p>\n<p>\u5e26\u5bbd\u8ba1\u7b97\u548c\u89c4\u5212&#xff1a;\u5728\u8bbe\u8ba1\u9636\u6bb5\u5c31\u5e94\u8be5\u8ba1\u7b97\u7406\u8bba\u5e26\u5bbd\u9700\u6c42&#xff0c;\u786e\u4fdd\u7cfb\u7edf\u67b6\u6784\u80fd\u591f\u6ee1\u8db3\u8981\u6c42\u3002\u8bb0\u5f97\u8003\u8651\u603b\u7ebf\u4ef2\u88c1\u3001\u5185\u5b58\u5e26\u5bbd\u7b49\u56e0\u7d20\u7684\u5b9e\u9645\u5f71\u54cd\u3002<\/p>\n<p>\u6709\u4e00\u6b21\u6211\u4eec\u9879\u76ee\u7684\u6027\u80fd\u53ea\u6709\u7406\u8bba\u503c\u7684\u4e00\u534a&#xff0c;\u901a\u8fc7\u6027\u80fd\u8ba1\u6570\u5668\u53d1\u73b0\u662f\u5185\u5b58\u8bbf\u95ee\u51b2\u7a81\u5bfc\u81f4\u7684\u3002\u8c03\u6574\u4e86\u5185\u5b58\u8bbf\u95ee\u6a21\u5f0f\u540e&#xff0c;\u6027\u80fd\u63d0\u5347\u4e86\u8fd1\u4e00\u500d\u3002\u8fd9\u4e2a\u7ecf\u5386\u8ba9\u6211\u8ba4\u8bc6\u5230\u7cfb\u7edf\u7ea7\u6027\u80fd\u5206\u6790\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h3>6. \u9ad8\u7ea7\u4f18\u5316\u6280\u5de7<\/h3>\n<h4>6.1 \u7f13\u5b58\u4e00\u81f4\u6027\u5904\u7406<\/h4>\n<p>\u5728ZYNQ\u7cfb\u7edf\u4e2d&#xff0c;\u7f13\u5b58\u4e00\u81f4\u6027\u662f\u5fc5\u987b\u91cd\u89c6\u7684\u95ee\u9898\u3002PS\u7aef\u7684CPU\u6709\u7f13\u5b58&#xff0c;\u800cDMA\u76f4\u63a5\u8bbf\u95ee\u5185\u5b58&#xff0c;\u5982\u679c\u5904\u7406\u4e0d\u5f53\u4f1a\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3002<\/p>\n<p>\u5199\u5165\u6570\u636e\u65f6\u7684\u5904\u7406&#xff1a;PS\u7aef\u5728\u51c6\u5907\u597dDMA\u4f20\u8f93\u6570\u636e\u540e&#xff0c;\u9700\u8981\u5237\u65b0\u7f13\u5b58\u786e\u4fdd\u6570\u636e\u5199\u5165\u5185\u5b58&#xff1a;<\/p>\n<p>Xil_DCacheFlushRange((u32)TxBuffer, MAX_PKT_LEN);<\/p>\n<p>\u8bfb\u53d6\u6570\u636e\u65f6\u7684\u5904\u7406&#xff1a;DMA\u4f20\u8f93\u5b8c\u6210\u540e&#xff0c;PS\u7aef\u5728\u8bfb\u53d6\u6570\u636e\u524d\u9700\u8981\u65e0\u6548\u5316\u7f13\u5b58&#xff1a;<\/p>\n<p>Xil_DCacheInvalidateRange((u32)RxBuffer, MAX_PKT_LEN);<\/p>\n<p>\u8fd9\u4e9b\u64cd\u4f5c\u786e\u4fddCPU\u548cDMA\u770b\u5230\u7684\u6570\u636e\u662f\u4e00\u81f4\u7684\u3002\u5ffd\u7565\u7f13\u5b58\u4e00\u81f4\u6027\u4f1a\u5bfc\u81f4\u96be\u4ee5\u8c03\u8bd5\u7684\u6570\u636e\u9519\u8bef&#xff0c;\u6211\u66fe\u7ecf\u5c31\u56e0\u6b64\u6d6a\u8d39\u4e86\u4e24\u5929\u65f6\u95f4\u8ffd\u8e2a\u4e00\u4e2a\u65f6\u597d\u65f6\u574f\u7684\u6570\u636e\u9519\u8bef\u3002<\/p>\n<h4>6.2 \u6570\u636e\u4f20\u8f93\u94fe\u4f18\u5316<\/h4>\n<p>\u5bf9\u4e8e\u9700\u8981\u591a\u6b21\u4f20\u8f93\u7684\u5e94\u7528&#xff0c;\u53ef\u4ee5\u4f18\u5316\u4f20\u8f93\u94fe\u6765\u51cf\u5c11\u5f00\u9500\u3002\u4e00\u79cd\u6709\u6548\u7684\u65b9\u6cd5\u662f\u4f7f\u7528\u53cc\u7f13\u51b2&#xff08;ping-pong 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