first commit for chrg

2025-08-16 22:58:22 +08:00
commit 52a3ed5862
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+/*
+ * FreeModbus Libary: RT-Thread Port
+ * Copyright (C) 2019 flybreak <guozhanxin@rt-thread.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * File: $Id: portserial.c,v 1.60 2019/07/11 17:04:32 flybreak $
+ */
+
+#include "port.h"
+
+#ifdef PKG_MODBUS_SLAVE_TCP
+/* ----------------------- Modbus includes ----------------------------------*/
+#include "mb.h"
+#include "mbport.h"
+#include "tcpserver.h"
+
+/* ----------------------- Defines  -----------------------------------------*/
+#define MB_TCP_DEFAULT_PORT     502
+#define MB_TCP_BUF_SIZE     ( 256 + 7 )
+
+/* ----------------------- Static variables ---------------------------------*/
+static tcpclient_t mb_client;
+static UCHAR    prvvTCPBuf[MB_TCP_BUF_SIZE];
+static USHORT   prvvTCPLength;
+
+static void tcpserver_event_notify(tcpclient_t client, rt_uint8_t event)
+{
+    static rt_tick_t recv_tick = 0;
+    switch (event)
+    {
+    case TCPSERVER_EVENT_CONNECT:
+        if (mb_client == RT_NULL)
+        {
+            mb_client = client;
+        }
+        else
+        {
+            if(rt_tick_get() - recv_tick > 30 * RT_TICK_PER_SECOND) /* set timeout as 30s */
+            {
+                tcpserver_close(mb_client);
+                mb_client = client;
+                recv_tick = rt_tick_get();
+            }
+            else
+            {
+                tcpserver_close(client);
+                rt_kprintf("Multi-host is not supported, please disconnect the current host first!\n");
+            }
+        }
+        break;
+    case TCPSERVER_EVENT_RECV:
+        if( mb_client == client)
+        {
+            recv_tick = rt_tick_get();
+            prvvTCPLength = tcpserver_recv(mb_client, &prvvTCPBuf, MB_TCP_BUF_SIZE, 100);
+            if (prvvTCPLength)
+            {
+                xMBPortEventPost(EV_FRAME_RECEIVED);
+            }
+        }
+        break;
+    case TCPSERVER_EVENT_DISCONNECT:
+        if (mb_client == client)
+            mb_client = RT_NULL;
+        break;
+    default:
+        break;
+    }
+}
+
+BOOL
+xMBTCPPortInit(USHORT usTCPPort)
+{
+    struct tcpserver *serv;
+
+    if (usTCPPort == 0)
+        usTCPPort = MB_TCP_DEFAULT_PORT;
+
+    serv = tcpserver_create(0, usTCPPort);
+
+    tcpserver_set_notify_callback(serv, tcpserver_event_notify);
+
+    return TRUE;
+}
+
+void
+vMBTCPPortClose(void)
+{
+    tcpserver_destroy(mb_client->server);
+}
+
+void
+vMBTCPPortDisable(void)
+{
+    tcpserver_close(mb_client);
+}
+
+BOOL
+xMBTCPPortGetRequest(UCHAR **ppucMBTCPFrame, USHORT *usTCPLength)
+{
+    *ppucMBTCPFrame = &prvvTCPBuf[0];
+    *usTCPLength = prvvTCPLength;
+
+    return TRUE;
+}
+
+BOOL
+xMBTCPPortSendResponse(const UCHAR *pucMBTCPFrame, USHORT usTCPLength)
+{
+    rt_int16_t ret;
+    BOOL bFrameSent = FALSE;
+
+    if (mb_client)
+    {
+        ret = tcpserver_send(mb_client, (void *)pucMBTCPFrame, usTCPLength, 0);
+        if (ret == usTCPLength)
+            bFrameSent = TRUE;
+    }
+    return bFrameSent;
+}
+#endif