From 5c806b28c24b4525081499777d4815d5a52208f5 Mon Sep 17 00:00:00 2001
From: "nanxiangzi.imwork" <1539321817@qq.com>
Date: Thu, 21 Mar 2024 03:01:45 +0000
Subject: [PATCH] update freemodbus-v1.6/mbrtu.c.

Signed-off-by: nanxiangzi.imwork <1539321817@qq.com>
---
 freemodbus-v1.6/mbrtu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/freemodbus-v1.6/mbrtu.c b/freemodbus-v1.6/mbrtu.c
index 0e7c9fd..b1b5813 100644
--- a/freemodbus-v1.6/mbrtu.c
+++ b/freemodbus-v1.6/mbrtu.c
@@ -197,6 +197,11 @@ eMBRTUSend(  MBTypeDef* psModbus, UCHAR ucSlaveAddress, const UCHAR * pucFrame,
 
         /* Activate the transmitter. */
         psModbus->eSndState = STATE_TX_XMIT;
+        //启动第一次发送，这样才可以进入发送完成中断
+        psModbus->xMBPortSerialPutByte( ( CHAR )*psModbus->pucSndBufferCur );
+        psModbus->pucSndBufferCur++;  /* next byte in sendbuffer. */
+        psModbus->usSndBufferCount--;
+		//使能发送状态，禁止接收状态
         psModbus->vMBPortSerialEnable( FALSE, TRUE );
     }
     else
-- 
Gitee