{"id":97373,"date":"2026-08-29T10:48:57","date_gmt":"2026-08-29T02:48:57","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/97373.html"},"modified":"2026-08-29T10:48:57","modified_gmt":"2026-08-29T02:48:57","slug":"liteos-m%e5%86%8d%e8%be%a8%e6%9e%90%ef%bc%9a%e5%90%af%e5%8a%a8%e7%ac%ac%e4%b8%80%e4%b8%aa%e4%bb%bb%e5%8a%a1%ef%bc%8c%e5%88%b0%e5%ba%95%e9%9c%80%e4%b8%8d%e9%9c%80%e8%a6%81svc%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/97373.html","title":{"rendered":"LiteOS\u2011M\u518d\u8fa8\u6790\uff1a\u542f\u52a8\u7b2c\u4e00\u4e2a\u4efb\u52a1\uff0c\u5230\u5e95\u9700\u4e0d\u9700\u8981SVC\uff1f"},"content":{"rendered":"

\u2014\u2014STM32MP157 M4\u6838\u79fb\u690d\u590d\u76d8，\u4e3a\u4ec0\u4e48\u539f\u751fHalStartToRun\u4e0d\u7528SVC\u4e5f\u80fd\u5b8c\u6210PendSV\u8c03\u5ea6<\/p>\n

\u7cfb\u5217：LiteOS\u2011M\u79fb\u690d（Windows+GCC+Makefile，\u65e0Keil）
\n\u524d\u7f6e\u9605\u8bfb：\u300aLiteOS\u2011M PendSV\u963b\u585e\u4fee\u590d：\u4ece\u7ed5\u5f00\u8c03\u5ea6\u5668\u5230SVC+PendSV\u6807\u51c6\u542f\u52a8\u300b<\/p>\n

0 \u524d\u8a00<\/h3>\n

\u4e0a\u4e00\u7bc7\u535a\u5ba2\u79fb\u690d\u8fc7\u7a0b\u9047\u5230\u6545\u969c：\u7ed5\u5f00LOS_Start()\u76f4\u63a5\u8c03\u7528\u4efb\u52a1\u4f1a\u9020\u6210\u8c03\u5ea6\u5361\u6b7b，\u5f53\u65f6\u5b9e\u73b0\u4e86SVC+\u5f02\u5e38\u8fd4\u56de\u7684\u542f\u52a8\u65b9\u6848\u3002\u5f53\u65f6\u5f62\u6210\u7684\u8ba4\u77e5\u662fCortex\u2011M\u542f\u52a8\u9996\u4e2a\u4efb\u52a1\u5fc5\u987b\u4f9d\u9760SVC\u5f02\u5e38\u8fd4\u56de\u9000\u51faReset\u4e0a\u4e0b\u6587\u3002<\/p>\n

\u540e\u7eed\u6df1\u5165\u7814\u8bfb\u539f\u751f\u5de5\u7a0b\u6c47\u7f16\u4ee3\u7801\u540e\u53d1\u73b0\u4e00\u4e2a\u503c\u5f97\u63a2\u8ba8\u7684\u95ee\u9898：LiteOS\u2011M\u539f\u751fHalStartToRun\u5e76\u6ca1\u6709\u4f7f\u7528SVC，\u540c\u6837\u53ef\u4ee5\u6b63\u5e38\u5b8c\u6210\u4efb\u52a1\u521b\u5efa\u3001PendSV\u62a2\u5360\u8c03\u5ea6\u3002<\/p>\n

\u672c\u7bc7\u505a\u539f\u7406\u8fa8\u6790：SVC\u7a76\u7adf\u662f\u542f\u52a8\u9996\u4efb\u52a1\u7684\u786c\u4ef6\u786c\u6027\u6807\u51c6，\u8fd8\u662f\u9762\u5411\u901a\u7528\u573a\u666f\u7684\u9ad8\u517c\u5bb9\u6027\u53ef\u9009\u5b9e\u73b0\u3002\u7ed3\u5408\u6c47\u7f16\u4ee3\u7801\u3001CPU Thread\/Handler\u6a21\u5f0f\u3001\u4e09\u79cd\u542f\u52a8\u8def\u5f84，\u7406\u6e05\u4e0d\u540cRTOS\u505a\u51fa\u4e0d\u540c\u8bbe\u8ba1\u9009\u62e9\u7684\u5e95\u5c42\u539f\u56e0\u3002<\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\u56fe\u6ce8：\u56fe\u2460 \u65b9\u6848A\/B\/C\u4e09\u79cd\u9996\u4efb\u52a1\u542f\u52a8\u65b9\u6848\u603b\u89c8\u5bf9\u6bd4<\/p>\n

1 \u4e09\u6761\u542f\u52a8\u8def\u5f84\u603b\u89c8<\/h3>\n\n\u65b9\u6848A：\u76f4\u63a5\u8c03\u7528\u4efb\u52a1（\u7ed5\u5f00LOS_Start）\u65b9\u6848B：SVC\u89e6\u53d1\u5f02\u5e38\u8fd4\u56de（\u4e0a\u7bc7\u6539\u9020\u65b9\u6848，FreeRTOS\/RT\u2011Thread\u4e3b\u6d41）\u65b9\u6848C：\u539f\u751f\u8def\u5f84LOS_Start \u2192 HalStartToRun（LiteOS\u2011M\u5f53\u524d\u5de5\u7a0b）<\/tr>\n\n\n\n\n\n\n\n
PendSV\u4f18\u5148\u7ea7<\/td>\n\u672a\u914d\u7f6e<\/td>\nSVC Handler\u5185\u914d\u7f6e<\/td>\nHalStartToRun\u6c47\u7f16\u914d\u7f6e<\/td>\n<\/tr>\n
CONTROL\/PSP<\/td>\n\u5b8c\u5168\u672a\u521d\u59cb\u5316<\/td>\nEXC_RETURN\u786c\u4ef6\u81ea\u52a8\u5207\u6362<\/td>\n\u6c47\u7f16\u624b\u52a8msr CONTROL + msr psp<\/td>\n<\/tr>\n
\u786c\u4ef6\u6808\u5e27\u6062\u590d<\/td>\n\u7f3a\u5931<\/td>\n\u5f02\u5e38\u8fd4\u56de\u786c\u4ef6\u81ea\u52a8\u6062\u590d<\/td>\nldmfd\u624b\u52a8\u52a0\u8f7d\u786c\u4ef6\u5e27\u5185\u5bb9<\/td>\n<\/tr>\n
\u4e2d\u65ad\u4f7f\u80fd<\/td>\n\u672a\u6b63\u786e\u6253\u5f00<\/td>\nSVC Handler\u6253\u5f00<\/td>\ncpsie i\u6c47\u7f16\u6307\u4ee4\u6253\u5f00<\/td>\n<\/tr>\n
\u8fdb\u5165\u4efb\u52a1\u65b9\u5f0f<\/td>\nC\u8bed\u8a00\u76f4\u63a5call<\/td>\nbx lr\u5f02\u5e38\u8fd4\u56de<\/td>\nbx r6\u666e\u901a\u8df3\u8f6c<\/td>\n<\/tr>\n
\u662f\u5426\u9700\u8981SVC<\/td>\n\u4e0d\u9700\u8981<\/td>\n\u9700\u8981<\/td>\n\u4e0d\u9700\u8981<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u65b9\u6848A：\u76f4\u63a5\u8c03\u7528\u4efb\u52a1（\u7ed5\u5f00LOS_Start）\u2014\u2014\u5931\u8d25<\/h4>\n

LOS_KernelInit<\/span>(<\/span>)<\/span>;<\/span>
\nled_task<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u76f4\u63a5\u8c03\u7528，\u8df3\u8fc7LOS_Start()<\/span><\/p>\n

\u8fd9\u662f\u7b2c\u2464\u7bc7\u7684\u4e34\u65f6\u5e94\u6025\u624b\u6bb5，HalStartToRun\u5b8c\u5168\u6ca1\u6709\u6267\u884c，5\u9879\u5173\u952e\u8fd0\u884c\u6761\u4ef6\u5168\u90e8\u7f3a\u5931：<\/p>\n

  • PendSV\u4f18\u5148\u7ea7\u6ca1\u6709\u8bbe\u7f6e，\u4fdd\u6301\u9ed8\u8ba4\u503c<\/li>\n
  • CONTROL.SPSEL=0，\u6301\u7eed\u4f7f\u7528MSP\u4e3b\u6808，\u6ca1\u6709\u5207\u6362PSP\u4efb\u52a1\u6808<\/li>\n
  • PSP\u5bc4\u5b58\u5668\u672a\u521d\u59cb\u5316，PendSV\u4e0a\u4e0b\u6587\u5207\u6362\u8bfb\u53d6\u5783\u573e\u503c<\/li>\n
  • TaskContext\u4efb\u52a1\u6808\u786c\u4ef6\u5e27\u672a\u505a\u6062\u590d\u5f39\u51fa<\/li>\n
  • \u4e2d\u65ad\u72b6\u6001\u4e0d\u53ef\u63a7，SysTick\u3001PendSV\u65e0\u6cd5\u62a2\u5360<\/li>\n

    \u5373\u4fbf\u8c03\u7528LOS_TaskDelay()\u89e6\u53d1PendSV\u6302\u8d77，\u4e5f\u4f1a\u89e6\u53d1HardFault\u6216\u8005\u7cfb\u7edf\u5361\u6b7b\u3002<\/p>\n

    \u672c\u8d28：\u53ea\u662f\u666e\u901a\u51fd\u6570\u8c03\u7528，\u6ca1\u6709\u6784\u5efaRTOS\u4efb\u52a1\u8fd0\u884c\u73af\u5883\u3002<\/p>\n

    \u65b9\u6848B：SVC\u89e6\u53d1\u5f02\u5e38\u8fd4\u56de（\u4e0a\u7bc7\u7684\u6539\u9020\u65b9\u6848）\u2014\u2014\u4e1a\u754c\u4e3b\u6d41\u901a\u7528\u5b9e\u73b0<\/h4>\n

    FreeRTOS\u3001RT\u2011Thread\u7b49\u4e3b\u6d41RTOS\u5747\u91c7\u7528\u8be5\u5957\u601d\u8def\u3002\u8be5\u65b9\u6848\u4f18\u52bf\u662f\u4e0d\u5047\u8bbe\u8c03\u7528\u65b9CPU\u5904\u4e8e\u54ea\u79cd\u8fd0\u884c\u6a21\u5f0f，Handler\u3001Thread\u4e0a\u4e0b\u6587\u5747\u53ef\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n

    \u4e0a\u7bc7\u79fb\u690d\u6545\u969c\u573a\u666f\u4e2d，\u542f\u52a8\u4ee3\u7801\u610f\u5916\u8fd0\u884c\u5728Handler\u6a21\u5f0f\u3002Handler\u6a21\u5f0f\u786c\u4ef6\u9650\u5236：\u76f4\u63a5\u4fee\u6539CONTROL\u5bc4\u5b58\u5668SPSEL\u4f4d\u4e0d\u4f1a\u751f\u6548\u3002
    \n\u91c7\u7528SVC\u5b8c\u6574\u6d41\u7a0b：<\/p>\n

  • \u6267\u884csvc #0\u89e6\u53d1SVC\u5f02\u5e38，CPU\u8fdb\u5165SVC Handler；<\/li>\n
  • Handler\u5185\u90e8\u51c6\u5907EXC_RETURN = 0xFFFFFFFD；<\/li>\n
  • bx lr\u6267\u884c\u5f02\u5e38\u8fd4\u56de，\u786c\u4ef6\u81ea\u52a8\u5b8c\u6210\u4e09\u4ef6\u4e8b：\u5207Thread\u6a21\u5f0f\u3001\u5207\u6362PSP\u3001\u786c\u4ef6\u5b8c\u6574\u6062\u590dR0\u2011R3\/R12\/LR\/PC\/xPSR\u786c\u4ef6\u6808\u5e27\u3002<\/li>\n

    \u8fd9\u5957\u65b9\u6848\u517c\u5bb9\u6027\u5f88\u5f3a，\u65e0\u8bba\u8c03\u7528\u65b9\u6765\u81eaHandler\u6216\u8005Thread\u6a21\u5f0f\u90fd\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u3002\u4e0a\u7bc7\u79fb\u690d\u6b63\u662f\u5229\u7528\u8be5\u7279\u6027\u89e3\u51b3\u4e86\u4e0a\u4e0b\u6587\u5f02\u5e38\u5e26\u6765\u7684\u8c03\u5ea6\u6545\u969c\u3002<\/p>\n

    SVC\u65b9\u6848\u4e0d\u662f\u9519\u8bef\u8865\u4e01，\u662f\u5546\u7528RTOS\u4f18\u5148\u9009\u62e9\u7684\u9ad8\u9c81\u68d2\u6027\u5b9e\u73b0；\u53ea\u662f\u5728\u672c\u5de5\u7a0b\u539f\u751fThread\u4e0a\u4e0b\u6587\u573a\u666f\u4e0b，\u4e0d\u5c5e\u4e8e\u5fc5\u9700\u3002<\/p>\n

    \"\u5916\u94fe\u56fe\u7247\u8f6c\u5b58\u5931\u8d25,\u6e90\u7ad9\u53ef\u80fd\u6709\u9632\u76d7\u94fe\u673a\u5236,\u5efa\u8bae\u5c06\u56fe\u7247\u4fdd\u5b58\u4e0b\u6765\u76f4\u63a5\u4e0a\u4f20\"<\/p>\n

    \u56fe\u6ce8：\u56fe\u2461 \u65b9\u6848B：SVC+\u5f02\u5e38\u8fd4\u56de\u5b8c\u6574\u6267\u884c\u6d41\u7a0b<\/p>\n

    \u65b9\u6848C：\u539f\u751f\u8def\u5f84 LOS_Start \u2192 HalStartSchedule \u2192 HalStartToRun \u2192 bx r6 OsTaskEntry（LiteOS\u2011M，\u65e0\u9700SVC）<\/h4>\n

    \u5b8c\u6574\u8c03\u7528\u94fe：<\/p>\n

    Reset_Handler \u2192 main()\u3010Thread\u6a21\u5f0f\u3011\u2192 LOS_Start() \u2192 HalStartSchedule() \u2192 HalStartToRun() \u2192 bx r6 \u8df3OsTaskEntry<\/p>\n

    \u26a0\u786c\u4ef6\u9690\u5f0f\u524d\u7f6e\u6761\u4ef6：LOS_Start\u51fd\u6570\u5185\u90e8\u6ca1\u6709\u4efb\u4f55\u4ee3\u7801\u505a\u6a21\u5f0f\u5224\u65ad\u4e0e\u65ad\u8a00\u62e6\u622a，\u80fd\u591f\u6b63\u5e38\u5207\u6362PSP\u7684\u524d\u63d0\u662f\u8c03\u7528\u65b9\u5df2\u7ecf\u5904\u4e8eThread\u6a21\u5f0f\u3002
    \n\u56e0\u4e3aARMv7\u2011M\u786c\u4ef6\u884c\u4e3a：Handler\u6a21\u5f0f\u4e0b\u5199CONTROL\u5bc4\u5b58\u5668SPSEL\u4f4d\u4f1a\u88ab\u786c\u4ef6\u9759\u9ed8\u5ffd\u7565\u3002\u5982\u679c\u4eceHandler\u4e0a\u4e0b\u6587\u8c03\u7528LOS_Start，\u4e0d\u4f1a\u89e6\u53d1\u62a5\u9519，\u53ea\u662f\u5806\u6808\u5207\u6362\u5931\u6548，\u7ee7\u7eed\u8dd1\u5728MSP\u4e3b\u6808\u3002<\/p>\n

    HalStartToRun\u6c47\u7f16\u5173\u952e\u903b\u8f91\u8282\u9009：<\/p>\n

    HalStartToRun:
    \n ldr r4, =OS_NVIC_SYSPRI2 @\u2460 \u8bbe\u7f6ePendSV\u3001SysTick\u4f18\u5148\u7ea7，\u4e24\u8005\u5747\u914d\u7f6e\u4e3a0xF0\u6700\u4f4e\u4f18\u5148\u7ea7
    \n ldr r5, =OS_NVIC_PENDSV_PRI
    \n str r5, [r4]<\/p>\n

    mov r0, #2
    \n msr CONTROL, r0 @\u2461 Thread\u6a21\u5f0f\u4e0b，SPSEL=1，\u5207\u6362\u4f7f\u7528PSP
    \n \u2026\u2026
    \n ldmfd r12!, {R0\u2011R7} @\u2462 \u4ece\u4efb\u52a1\u6808\u5f39\u51fa\u786c\u4ef6\u5e27\u5185\u5bb9（\u6c47\u7f16\u843d\u70b9R0\u2011R7）
    \n msr psp, r12 @\u2463 \u8bbe\u7f6ePSP\u4e3a\u4efb\u52a1\u6808\u9876
    \n vpush {s0}; vpop {s0} @\u2464 \u6fc0\u6d3bFPCA\u6807\u5fd7，\u5f02\u5e38\u81ea\u52a8\u4fdd\u5b58FPU\u5bc4\u5b58\u5668
    \n cpsie i @\u2465 \u5f00\u542f\u5168\u5c40\u4e2d\u65ad
    \n bx r6 @\u2466 \u666e\u901a\u8df3\u8f6c\u8fdb\u5165\u4efb\u52a1\u5165\u53e3 OsTaskEntry<\/p>\n

    \u6838\u5fc3\u6d1e\u5bdf：Cortex\u2011M Thread\u6a21\u5f0f，\u4e0d\u9700\u8981\u5f02\u5e38\u8fd4\u56de\u5c31\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528PSP\u3002<\/p>\n

    \u8fd9\u91cc\u624b\u52a8\u6062\u590d R0\u2011R3\/R12\/LR\/PC；xPSR\u4ec5\u8bfb\u5230R7\u5bc4\u5b58\u5668，\u5e76\u4e0d\u4f1a\u5199\u56de\u771f\u5b9exPSR\u72b6\u6001\u5bc4\u5b58\u5668\u3002
    \nThumb\u6a21\u5f0f\u4f9d\u9760bx r6\u8df3\u8f6c\u76ee\u6807\u5730\u5740bit0\u4f4d\u4fdd\u8bc1，\u548c\u5f02\u5e38\u8fd4\u56de\u786c\u4ef6\u81ea\u52a8\u6062\u590d\u5b8c\u6574xPSR\u5b58\u5728\u672c\u8d28\u533a\u522b\u3002<\/p>\n

    SVC\u5f02\u5e38\u8fd4\u56de\u8fbe\u6210\u7684\u6548\u679c：\u5207Thread\u6a21\u5f0f + \u5207\u6362PSP + \u786c\u4ef6\u5b8c\u6574\u6062\u590d\u786c\u4ef6\u6808\u5e27\u3002
    \n\u539f\u751fHalStartToRun\u628a\u4e0a\u8ff0\u52a8\u4f5c\u62c6\u89e3\u4e3a\u666e\u901a\u6c47\u7f16\u6307\u4ee4\u5b8c\u6210：<\/p>\n

  • Thread\u6a21\u5f0f\u76f4\u63a5\u5199CONTROL.SPSEL=1\u5207\u6362PSP；<\/li>\n
  • msr psp\u624b\u52a8\u8bbe\u7f6e\u4efb\u52a1\u6808\u6307\u9488；<\/li>\n
  • ldmfd\u624b\u52a8\u52a0\u8f7d\u786c\u4ef6\u5e27\u5185\u5bb9；<\/li>\n
  • cpsie i\u5f00\u4e2d\u65ad，\u666e\u901abx\u8df3\u8f6c\u8fdb\u5165\u4efb\u52a1\u3002<\/li>\n

    \u2728\u624b\u52a8\u65b9\u6848\u4e0e\u5f02\u5e38\u8fd4\u56de\u7684\u672c\u8d28\u5dee\u522b：
    \n\u5f02\u5e38\u8fd4\u56de\u4f1a\u771f\u5b9e\u5199\u56dexPSR\u5e76\u786c\u4ef6\u5f3a\u5236\u628aCPU\u5207\u56deThread\u6a21\u5f0f；
    \n\u624b\u52a8\u65b9\u6848\u4f9d\u8d56\u5df2\u7ecf\u5904\u4e8eThread\u6a21\u5f0f + bx\u8df3\u8f6c\u5730\u5740\u7684Thumb bit0\u4f4d\u6765\u7b49\u4ef7\u5b9e\u73b0，\u56e0\u6b64\u53ef\u4ee5\u7701\u53bbSVC\u4e00\u5708\u5f02\u5e38\u8fdb\u51fa\u3002<\/p>\n

    \u8fd0\u884c\u6548\u679c\u4e0eSVC\u5f02\u5e38\u8fd4\u56de\u5b8c\u5168\u7b49\u4ef7：\u4efb\u52a1\u8fd0\u884c\u5728Thread\u6a21\u5f0f+PSP\u4efb\u52a1\u6808，SysTick\u3001PendSV\u53ef\u6b63\u5e38\u62a2\u5360\u3002<\/p>\n

    \u540e\u7eed\u8c03\u5ea6\u95ed\u73af：\u4efb\u52a1\u5185\u90e8\u8c03\u7528LOS_TaskDelay \u2192 \u8bbe\u7f6ePENDSVSET\u89e6\u53d1PendSV\u5f02\u5e38 \u2192 HalPendSV\u4fdd\u5b58\u4e0a\u4e0b\u6587\u5230PSP，\u52a0\u8f7d\u4e0b\u4e00\u4e2a\u4efb\u52a1，\u4f9d\u9760bx lr(EXC_RETURN)\u5f02\u5e38\u8fd4\u56de\u5207\u6362\u65b0\u4efb\u52a1\u3002
    \n\u6ce8\u610f：\u4efb\u52a1\u4e4b\u95f4PendSV\u4e0a\u4e0b\u6587\u5207\u6362，\u5fc5\u987b\u4f9d\u9760\u5f02\u5e38\u8fd4\u56de\u673a\u5236，\u8fd9\u4e00\u70b9\u4e24\u79cd\u65b9\u6848\u5b8c\u5168\u4e00\u81f4\u3002<\/p>\n

    \"\u5916\u94fe\u56fe\u7247\u8f6c\u5b58\u5931\u8d25,\u6e90\u7ad9\u53ef\u80fd\u6709\u9632\u76d7\u94fe\u673a\u5236,\u5efa\u8bae\u5c06\u56fe\u7247\u4fdd\u5b58\u4e0b\u6765\u76f4\u63a5\u4e0a\u4f20\"<\/p>\n

    \u56fe\u6ce8：\u56fe\u2462 \u65b9\u6848C LiteOS\u2011M\u539f\u751f\u9996\u4efb\u52a1\u542f\u52a8\u6267\u884c\u6d41\u7a0b<\/p>\n

    3 \u52d8\u8bef\u56de\u987e<\/h3>\n

    📌\u52d8\u8bef\u56de\u987e（\u5bf9\u5e94\u4e0a\u7bc7\u535a\u6587\u8865\u5145）
    \n\u4e0a\u7bc7\u91c7\u7528\u7684SVC\u542f\u52a8\u65b9\u6848\u662f\u4e1a\u754c\u901a\u7528\u53ef\u9760\u5b9e\u73b0，\u517c\u5bb9\u6027\u5f3a\u3002\u5f53\u542f\u52a8\u4ee3\u7801\u8fd0\u884c\u5728Handler\u6a21\u5f0f\u65f6，SVC\u5f02\u5e38\u8fd4\u56de\u662f\u5fc5\u8981\u624b\u6bb5\u3002<\/p>\n

    \u5728\u672c\u5de5\u7a0b\u6807\u51c6\u539f\u751f\u6d41\u7a0b\u4e2d，main\u8fd0\u884c\u5728Thread\u6a21\u5f0f，HalStartToRun\u76f4\u63a5\u64cd\u4f5c\u5bc4\u5b58\u5668\u5373\u53ef\u5b8c\u6210\u5168\u90e8\u521d\u59cb\u5316，SVC\u4e0d\u662f\u5fc5\u9700\u3002\u4e24\u79cd\u5b9e\u73b0\u90fd\u7b26\u5408Cortex\u2011M\u67b6\u6784\u89c4\u8303，\u533a\u522b\u6765\u81ea\u786c\u4ef6\u524d\u7f6e\u6761\u4ef6，\u5185\u6838\u672c\u8eab\u6ca1\u6709\u505a\u8fd0\u884c\u65f6\u6a21\u5f0f\u6821\u9a8c\u3002<\/p>\n

    4 \u6838\u5fc3\u7ed3\u8bba\u603b\u7ed3<\/h3>\n
  • SVC\u4e0d\u662fCortex\u2011M\u786c\u4ef6\u5f3a\u5236\u7684\u5fc5\u9009\u64cd\u4f5c，\u662f\u5426\u9009\u7528\u53d6\u51b3\u4e8e\u8c03\u7528HalStartToRun\u65f6\u523bCPU\u6240\u5904\u6a21\u5f0f（IPSR\u5bc4\u5b58\u5668）\n
      \n
    • \u8fd0\u884c\u5728Handler\u6a21\u5f0f：msr CONTROL\u4fee\u6539SPSEL\u4f1a\u88ab\u786c\u4ef6\u5ffd\u7565，\u5fc5\u987b\u501f\u52a9SVC\u89e6\u53d1\u5f02\u5e38\u8fd4\u56de\u5b8c\u6210\u5806\u6808\u4e0e\u6a21\u5f0f\u5207\u6362；<\/li>\n
    • \u8fd0\u884c\u5728Thread\u6a21\u5f0f：\u76f4\u63a5\u914d\u7f6eCONTROL\u3001PSP，\u624b\u52a8\u52a0\u8f7d\u6808\u5e27，\u666e\u901abx\u8df3\u8f6c\u5373\u53ef\u542f\u52a8\u4efb\u52a1，\u65e0\u9700SVC\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \u65b9\u6848B(SVC)\u4e3a\u5546\u7528RTOS\u4e3b\u6d41\u9009\u62e9，\u517c\u5bb9\u4efb\u610f\u8c03\u7528\u4e0a\u4e0b\u6587；LiteOS\u2011M\u65b9\u6848C\u5c5e\u4e8e\u8f7b\u91cf\u5316\u5b9e\u73b0，\u4f9d\u8d56\u300c\u8c03\u7528\u65b9\u5904\u4e8eThread\u6a21\u5f0f\u300d\u8fd9\u4e2a\u786c\u4ef6\u524d\u7f6e\u6761\u4ef6\u3002<\/li>\n
    • \u9996\u4efb\u52a1\u542f\u52a8\u4e0d\u5f3a\u5236\u5f02\u5e38\u8fd4\u56de；\u4efb\u52a1\u4e4b\u95f4PendSV\u4e0a\u4e0b\u6587\u5207\u6362\u5fc5\u987b\u4f9d\u9760\u5f02\u5e38\u8fd4\u56de\u3002<\/li>\n
    • FPU\u76f8\u5173\u7f16\u8bd1\u5b8f\u4f1a\u6539\u53d8TaskContext\u7ed3\u6784\u4f53\u5c3a\u5bf8，C\u8bed\u8a00\u7ed3\u6784\u4f53\u5fc5\u987b\u548c\u6c47\u7f16\u786c\u7f16\u7801\u6808\u504f\u79fb\u4e25\u683c\u5bf9\u9f50，\u5426\u5219\u4f1a\u51fa\u73b0\u6808\u9519\u4f4d\u89e6\u53d1UsageFault\u5f02\u5e38\u3002<\/li>\n

      5 \u5ef6\u4f38\u601d\u8003：\u4e3a\u4ec0\u4e48 FreeRTOS\u3001RT\u2011Thread \u666e\u904d\u91c7\u7528SVC\u542f\u52a8\u9996\u4efb\u52a1？<\/h3>\n

      \u8fd9\u4e5f\u662f FreeRTOS\u3001RT\u2011Thread \u7b49\u6240\u6709\u4e3b\u6d41 RTOS \u5728 Cortex\u2011M \u4e0a\u542f\u52a8\u7b2c\u4e00\u4e2a\u4efb\u52a1\u65f6，\u4e0d\u7ea6\u800c\u540c\u91c7\u7528 SVC（\u6216\u7b49\u4ef7\u673a\u5236）\u7684\u6839\u672c\u539f\u56e0\u3002<\/p>\n

      \"\u5916\u94fe\u56fe\u7247\u8f6c\u5b58\u5931\u8d25,\u6e90\u7ad9\u53ef\u80fd\u6709\u9632\u76d7\u94fe\u673a\u5236,\u5efa\u8bae\u5c06\u56fe\u7247\u4fdd\u5b58\u4e0b\u6765\u76f4\u63a5\u4e0a\u4f20\"<\/p>\n

      \u56fe\u6ce8：\u56fe\u2463 \u4e0d\u540cRTOS\u9996\u4efb\u52a1\u542f\u52a8\u65b9\u6848\u9009\u578b\u903b\u8f91\u5bf9\u6bd4<\/p>\n

      \u4e3b\u6d41RTOS\u4e0d\u505a\u4e25\u82db\u7684\u524d\u7f6e\u5047\u8bbe：\u4e0d\u4fdd\u8bc1\u8c03\u5ea6\u542f\u52a8\u51fd\u6570\u4e00\u5b9a\u5728main\u7684Thread\u6a21\u5f0f\u4e0b\u8c03\u7528，\u5141\u8bb8\u4ece\u5f02\u5e38Handler\u4e0a\u4e0b\u6587\u542f\u52a8\u5185\u6838\u3002<\/p>\n

        \n
      • \u5982\u679c\u4eceHandler\u6a21\u5f0f\u542f\u52a8\u5185\u6838，\u76f4\u63a5\u4fee\u6539CONTROL.SPSEL\u4f1a\u88ab\u786c\u4ef6\u5ffd\u7565，LiteOS\u2011M\u65b9\u6848C\u76f4\u63a5\u5931\u6548；<\/li>\n
      • SVC\u65b9\u6848\u53ef\u4ee5\u540c\u65f6\u517c\u5bb9Handler\u3001Thread\u4e24\u79cd\u4e0a\u4e0b\u6587，\u65e0\u8bba\u4ece\u4f55\u5904\u8c03\u7528，\u90fd\u80fd\u53ef\u9760\u5b8c\u6210\u6a21\u5f0f\u5207\u6362\u3001\u6808\u5e27\u6062\u590d，\u9c81\u68d2\u6027\u66f4\u9ad8\u3002<\/li>\n<\/ul>\n

        \u800c LiteOS\u2011M \u7684\u539f\u751f\u5b9e\u73b0\u505a\u4e86\u7b80\u5316\u53d6\u820d，\u4f9d\u8d56\u7cfb\u7edf\u4ecemain(Thread)\u8fdb\u5165\u8c03\u5ea6\u5668\u7684\u6807\u51c6\u542f\u52a8\u6d41\u7a0b，\u5728\u8be5\u524d\u63d0\u4e4b\u4e0b，\u5c31\u53ef\u4ee5\u7701\u7565SVC，\u76f4\u63a5\u64cd\u4f5c\u5bc4\u5b58\u5668\u5b8c\u6210\u9996\u4efb\u52a1\u542f\u52a8\u3002<\/p>\n

        \u5c0f\u7ed3<\/p>\n

          \n
        • \u65b9\u6848B(SVC)：\u901a\u7528\u65e0\u4e0a\u4e0b\u6587\u5047\u8bbe \u2192 FreeRTOS \/ RT\u2011Thread \u4e3b\u6d41\u9009\u578b；<\/li>\n
        • \u65b9\u6848C(\u76f4\u63a5\u5bc4\u5b58\u5668\u64cd\u4f5c)：\u8f7b\u91cf\u5316，\u4f9d\u8d56\u8c03\u7528\u65b9\u5904\u4e8eThread\u6a21\u5f0f \u2192 LiteOS\u2011M\u539f\u751f\u5b9e\u73b0\u3002
          \n\u4e24\u79cd\u5b9e\u73b0\u5747\u7b26\u5408ARMv7\u2011M\u67b6\u6784\u89c4\u8303，\u53ea\u662f\u4ea7\u54c1\u5b9a\u4f4d\u4e0e\u8bbe\u8ba1\u53d6\u820d\u4e0d\u4e00\u6837，\u4e0d\u5b58\u5728\u7edd\u5bf9\u4f18\u52a3\u3002<\/li>\n<\/ul>\n
          \n

          \u7cfb\u5217\u6587\u7ae0\u7d22\u5f15<\/p>\n

        • LiteOS\u2011M\u79fb\u690d\u2460：\u73af\u5883\u642d\u5efa\u3001\u7f16\u8bd1\u94fe\u63a5\u811a\u672c<\/li>\n
        • LiteOS\u2011M\u79fb\u690d\u2464：\u94fe\u63a5\u811a\u672c\u4e0e\u57fa\u7840\u8fd0\u884c<\/li>\n
        • LiteOS\u2011M PendSV\u963b\u585e\u4fee\u590d：\u4ece\u7ed5\u5f00\u8c03\u5ea6\u5668\u5230SVC+PendSV\u6807\u51c6\u542f\u52a8<\/li>\n
        • \u672c\u7bc7：\u518d\u8fa8\u6790：\u542f\u52a8\u7b2c\u4e00\u4e2a\u4efb\u52a1\u5230\u5e95\u9700\u4e0d\u9700\u8981SVC？<\/li>\n
          \n","protected":false},"excerpt":{"rendered":"

          \u2014\u2014STM32MP157 M4\u6838\u79fb\u690d\u590d\u76d8，\u4e3a\u4ec0\u4e48\u539f\u751fHalStartToRun\u4e0d\u7528SVC\u4e5f\u80fd\u5b8c\u6210PendSV\u8c03\u5ea6\u7cfb\u5217：LiteOS\u2011M\u79fb\u690d（WindowsGCCMakefile，\u65e0Keil）
          \n\u524d\u7f6e\u9605\u8bfb：\u300aLiteOS\u2011M PendSV\u963b\u585e\u4fee\u590d：\u4ece\u7ed5\u5f00\u8c03\u5ea6\u5668\u5230SVCPendSV\u6807\u51c6\u542f\u52a8\u300b0 \u524d\u8a00
          \n\u4e0a\u4e00\u7bc7\u535a\u5ba2\u79fb\u690d\u8fc7\u7a0b\u9047\u5230\u6545\u969c：\u7ed5\u5f00LOS_Start()\u76f4\u63a5\u8c03\u7528\u4efb\u52a1\u4f1a\u9020\u6210<\/p>\n","protected":false},"author":2,"featured_media":97369,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[217,270,269],"topic":[],"class_list":["post-97373","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-stm32","tag-270","tag-269"],"yoast_head":"\nLiteOS\u2011M\u518d\u8fa8\u6790\uff1a\u542f\u52a8\u7b2c\u4e00\u4e2a\u4efb\u52a1\uff0c\u5230\u5e95\u9700\u4e0d\u9700\u8981SVC\uff1f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/97373.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"LiteOS\u2011M\u518d\u8fa8\u6790\uff1a\u542f\u52a8\u7b2c\u4e00\u4e2a\u4efb\u52a1\uff0c\u5230\u5e95\u9700\u4e0d\u9700\u8981SVC\uff1f - 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