11.6：完善多任务和消息队列机制。

STM32/Environment_Node/System/SysTick.h

@@ -0,0 +1,28 @@
+#ifndef __SysTick_H__
+#define __SysTick_H__
+
+#include "stm32f10x.h"                  // Device header
+
+#define SYSTEM                          SYSTEM_FREERTOS
+#define SYSTEM_NONE                     0
+#define SYSTEM_FREERTOS                 1
+#define SYSTEM_UCOSII                   2
+#define SYSTEM_UCOSIII                  3
+#define SYSTEM_RT_THREAD                4
+#define SYSTEM_AZURE_RTOS               5
+
+typedef struct {
+  uint8_t ucFacUs;
+  int16_t usFacMs;
+} UcFacInit_t;
+
+static UcFacInit_t xUcFacInit = {
+  .ucFacUs = 0,
+  .usFacMs = 0
+};
+
+void vSysTickInit(uint8_t ucSYSCLK);
+void vDelayUs(uint32_t ulNus);
+void vDelayMs(uint16_t usNms);
+
+#endif