fix: 修复串口调试DCH通道切换无效及UART0无法接收调试指令的问题

1. DBGUartSend/DBGUartSendByte改为运行时通过gDebugChannel选择输出通道，替代编译期USE_BOOTLOADER宏
2. 启用Uart0_IRQHandler中的DebugUartIRQ调用，使UART0可接收调试指令

source/src/bsp.c

@@ -703,21 +703,21 @@ void PrintfMess(void)
 }
 void DBGUartSendByte(uint8_t sData)
 {
-#if USE_BOOTLOADER
+	if(gDebugChannel == DBG_CH_RS485_1) {
 		LPUart_SendData(M0P_LPUART0, sData);
-#else
+	} else {
 		Uart_SendDataPoll(M0P_UART0, sData);
-#endif
+	}
 }
 void DBGUartSend(uint8_t *sData, int sLen)
 {
-#if USE_BOOTLOADER
+	if(gDebugChannel == DBG_CH_RS485_1) {
 		LPUart0SendArray(sData, sLen);
-#else
+	} else {
 		for(int i = 0; i < sLen; i++) {
 			Uart_SendDataPoll(M0P_UART0, sData[i]);
 		}
-#endif
+	}
 }
 void LPUart0SendArray(uint8_t *sData, uint8_t sLen)
 {	
@@ -805,7 +805,7 @@ void Uart0_IRQHandler(void)
 	if(Uart_GetStatus(M0P_UART0, UartRC)) {   				///接收数据
 		Uart_ClrStatus(M0P_UART0, UartRC);   								///<清接收中断请求
 		uint8_t u8RxData = Uart_ReceiveData(M0P_UART0);			///读取数据
-		//DebugUartIRQ(u8RxData);
+		DebugUartIRQ(u8RxData);
 	}
 }