1、【增加】《FreeModbus 主机分析图》,但部分图还需要完善;

2、【修改】《FreeModbus 从机分析图》部分错误；
3、【修改】mbrtu_m.c 中关于接收状态及定时器超时状态机相关内容

Signed-off-by: armink <armink.ztl@gmail.com>

FreeModbus/modbus/rtu/mbrtu_m.c

@@ -56,14 +56,14 @@ typedef enum
 {
     STATE_M_RX_INIT,              /*!< Receiver is in initial state. */
     STATE_M_RX_IDLE,              /*!< Receiver is in idle state. */
-    STATE_M_RX_RCV                /*!< Frame is beeing received. */
+    STATE_M_RX_RCV,               /*!< Frame is beeing received. */
+    STATE_M_RX_ERROR              /*!< If the frame is invalid. */
 } eMBMasterRcvState;
 
 typedef enum
 {
     STATE_M_TX_IDLE,              /*!< Transmitter is in idle state. */
     STATE_M_TX_XMIT,              /*!< Transmitter is in transfer state. */
-    STATE_M_TX_ERROR              /*!< If the frame is invalid. */
 } eMBMasterSndState;
 
 /* ----------------------- Static variables ---------------------------------*/
@@ -337,10 +337,15 @@ xMBMasterRTUTimerT35Expired( void )
 	case STATE_M_RX_RCV:
 		xNeedPoll = xMBMasterPortEventPost(EV_FRAME_RECEIVED);
 		break;
+
+		/* An error occured while receiving the frame. */
+	case STATE_RX_ERROR:
+		break;
+
 		/* Function called in an illegal state. */
 	default:
 		assert_param(
-				( eRcvState == STATE_M_RX_INIT ) || ( eRcvState == STATE_M_RX_RCV ));
+				( eRcvState == STATE_M_RX_INIT ) || ( eRcvState == STATE_M_RX_RCV ) || ( eRcvState == STATE_M_RX_ERROR ));
 		break;
 	}
 
@@ -349,6 +354,13 @@ xMBMasterRTUTimerT35Expired( void )
 
 	//TODO 发送状态在超时后的状态转换需要添加
 
+	switch(eSndState)
+	{
+		/* Timer t35 expired. . */
+	case STATE_M_TX_XMIT :
+
+	}
+
 	return xNeedPoll;
 }
 #endif