fix:修改RS485通讯引脚

RS485通讯引脚改为串口2，引脚：RX：PB05 TX：PB04 RS485_DR:PB03

Source/main.c

@@ -0,0 +1,21 @@
+#include "includes.h"
+
+extern void delay_nms(unsigned int t);
+extern void APT32F102_init(void);
+
+
+int main(void) 
+{
+	APT32F102_init();							//102 initial
+	
+    while(1)
+	{
+		SYSCON_IWDCNT_Reload(); 				//IWDT Clear
+
+		UART2_TASK();
+		
+		BUS485Send_Task();
+
+		Boot_TimeOut_Task();
+    }
+}