From a486f7a684257f47761d56d5789fd9ed22967e9e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=BF=9E=E6=95=8F=E6=B6=9B?= <zjykymt@gmail.com>
Date: Thu, 26 Mar 2020 19:21:38 +0800
Subject: [PATCH] Update mbrtu_m.c
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Master模式下，接收缓冲区的索引在“接收到第一个字节”时重置修改为“开启发送”时重置
---
 FreeModbus/modbus/rtu/mbrtu_m.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/FreeModbus/modbus/rtu/mbrtu_m.c b/FreeModbus/modbus/rtu/mbrtu_m.c
index 3e96c27..9acfd89 100644
--- a/FreeModbus/modbus/rtu/mbrtu_m.c
+++ b/FreeModbus/modbus/rtu/mbrtu_m.c
@@ -204,6 +204,8 @@ eMBMasterRTUSend( UCHAR ucSlaveAddress, const UCHAR * pucFrame, USHORT usLength
      */
     if( eRcvState == STATE_M_RX_IDLE )
     {
+        usMasterRcvBufferPos = 0;
+
         /* First byte before the Modbus-PDU is the slave address. */
         pucMasterSndBufferCur = ( UCHAR * ) pucFrame - 1;
         usMasterSndBufferCount = 1;
@@ -268,7 +270,6 @@ xMBMasterRTUReceiveFSM( void )
     	vMBMasterPortTimersDisable( );
     	eSndState = STATE_M_TX_IDLE;
 
-        usMasterRcvBufferPos = 0;
         ucMasterRTURcvBuf[usMasterRcvBufferPos++] = ucByte;
         eRcvState = STATE_M_RX_RCV;