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发表于 2024-3-31 20:49:45
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但是现在又有一个新的问题，热插拔的问题，现在采用的方案是在检测到linkdown之后重新初始化网络协议栈，就是硬汉哥推荐的方式；但是对于这个VNC的例程插拔网线再重新连接有时候连接上会是黑屏，代码如下：
//检测到 linkdown 之后的重新初始化流程
1. linkdown的时候先 GUI_VNC_X_StopServer
2. 重新初始化网络协议栈
3. GUI_VNC_X_ReStartServer
为什么不直接再次调用函数 GUI_VNC_X_StartServer，实际测试的过程中，发现直接调用该函数的话重新连接就是黑屏，最终通过屏蔽代码的方式发现是 GUI_VNC_AttachToLayer 函数的问题，只要不再次调用 GUI_VNC_AttachToLayer 函数，再次连接可以成功。
但是现在还有一个问题，按照上面所写的流程，大部分的时候是能够连接上的，而且画面都是正常的，但是反复测试（拔网线，重新连接）偶尔会连上就黑屏，而且一旦黑屏后面再连接就一直是黑屏，但是此时网络是能够正常通信的，重启一下，然后再连接画面就正常了，唯一的区别就是GUI也重新初始化了一下。
目前还在看这个问题，硬汉哥有测试这样的情况吗
/*********************************************************************
* SEGGER Microcontroller GmbH *
* Solutions for real time microcontroller applications *
**********************************************************************
* *
* (c) 1996 - 2022 SEGGER Microcontroller GmbH *
* *
* Internet: www.segger.com Support: support@segger.com *
* *
**********************************************************************
** emWin V6.30 - Graphical user interface for embedded applications **
All Intellectual Property rights in the Software belongs to SEGGER.
emWin is protected by international copyright laws. Knowledge of the
source code may not be used to write a similar product. This file may
only be used in accordance with the following terms:
The software has been licensed to ARM LIMITED whose registered office
is situated at 110 Fulbourn Road, Cambridge CB1 9NJ, England solely
for the purposes of creating libraries for ARM7, ARM9, Cortex-M
series, and Cortex-R4 processor-based devices, sublicensed and
distributed as part of the MDK-ARM Professional under the terms and
conditions of the End User License supplied with the MDK-ARM
Professional.
Full source code is available at: www.segger.com
We appreciate your understanding and fairness.
----------------------------------------------------------------------
Licensing information
Licensor: SEGGER Software GmbH
Licensed to: ARM Ltd, 110 Fulbourn Road, CB1 9NJ Cambridge, UK
Licensed SEGGER software: emWin
License number: GUI-00181
License model: LES-SLA-20007, Agreement, effective since October 1st 2011
Licensed product: MDK-ARM Professional
Licensed platform: ARM7/9, Cortex-M/R4
Licensed number of seats: -
-------------------------- END-OF-HEADER -----------------------------
File : GUI_VNC_X_Keil.c
Purpose : Starts the VNC server via TCP/IP.
This version works with the Keil MDK-Pro TCP/IP stack.
Enable the BSD socket component.
Start by calling GUI_VNC_X_StartServer.
_ServerTask requires 4096 Bytes of private stack.
Only 1 client is supported.
*/
#include <stdlib.h>
#include <string.h>
#include "RTE_Components.h" // Component selection
#ifdef RTE_CMSIS_RTOS2
#include "cmsis_os2.h" // ::CMSIS:RTOS2
#else
#include "cmsis_os.h" // ::CMSIS:RTOS
#endif
#include "rl_net.h" // Keil::Network:CORE
#include "GUI.h"
#include "GUI_VNC.h"
/*********************************************************************
*
* Defines, configurable
*
**********************************************************************
*/
//
// Define maximum number of VNC clients that can connect
//
#define VNC_MAX_CLIENTS 1
/*********************************************************************
*
* Static data
*
**********************************************************************
*/
static GUI_VNC_CONTEXT _Context;
static struct sockaddr_in _Addr;
static U8 _acBuffer[GUI_VNC_BUFFER_SIZE];
/*********************************************************************
*
* Local functions
*
**********************************************************************
*/
/*********************************************************************
*
* _cbVNC_Recv()
*
* Function description
* This function is called indirectly by the server; it's address
* is passed to the actual server code as function pointer. It is
* needed because the server is independent of the TCP/IP stack
* implementation, so details for the TCP/IP stack can be placed
* here.
*
* Parameters
* pData : Where to store the received data.
* NumBytes : Maximum amount of data to receive.
* pConnection: Connection handle (WebSocket context).
*
* Return value
* Amount of data received: > 0
* Connection closed : == 0
* Error : < 0
*/
static int _cbVNC_Recv(U8* pData, int NumBytes, void* pConnection) {
return recv((long)pConnection, (char*)pData, NumBytes, 0);
}
/*********************************************************************
*
* _cbVNC_Send()
*
* Function description
* This function is called indirectly by the server; it's address
* is passed to the actual server code as function pointer. It is
* needed because the server is independent of the TCP/IP stack
* implementation, so details for the TCP/IP stack can be placed
* here.
*
* Parameters
* pData : Data to send.
* NumBytes : Amount of data to send.
* pConnection: Connection handle.
*
* Return value
* Amount of data sent: > 0
* Connection closed : == 0
* Error : < 0
*/
static int _cbVNC_Send(const U8* pData, int NumBytes, void* pConnection) {
return send((long)pConnection, (const char*)pData, NumBytes, 0);
}
/*********************************************************************
*
* _ListenAtTCPAddr()
*
* Function description
* Creates a non-blocking socket for accepting a VNC connection.
*
* Parameters
* Port: Port to use for accepting connections.
*
* Return value
* Parent socket handle.
*/
static int _ListenAtTCPAddr(U16 Port) {
int hSock;
struct sockaddr_in InAddr;
hSock = socket(AF_INET, SOCK_STREAM, 0);
if (hSock <= 0) {
while (1); // Should not happen.
}
memset(&InAddr, 0, sizeof(InAddr));
InAddr.sin_family = AF_INET;
InAddr.sin_port = htons(Port);
InAddr.sin_addr.s_addr = INADDR_ANY;
bind(hSock, (struct sockaddr*)&InAddr, sizeof(InAddr));
listen(hSock, 1);
return hSock;
}
/*********************************************************************
*
* _ServerTask
*
* Function description
* This routine is the actual server task.
* It executes some one-time init code, then runs in an ednless loop.
* It therefore does not terminate.
* In the endless loop it
* - Waits for a conection from a client
* - Runs the server code
* - Closes the connection
*/
#ifdef RTE_CMSIS_RTOS2
__NO_RETURN static void _ServerTask(void *arguments) {
#else
__NO_RETURN static void _ServerTask(void const *arguments) {
#endif
int s, Sock, AddrLen;
U16 Port;
(void)arguments;
//
// Prepare socket (one time setup)
//
Port = 5900 + _Context.ServerIndex; // Default port for VNC is is 590x, where x is the 0-based layer index
//
// Loop until we get a socket into listening state
//
do {
s = _ListenAtTCPAddr(Port);
if (s != -1) {
break;
}
osDelay(100); // Try again
} while (1);
//
// Loop once per client and create a thread for the actual server
//
while (1) {
//
// Wait for an incoming connection
//
AddrLen = sizeof(_Addr);
if ((Sock = accept(s, (struct sockaddr*)&_Addr, &AddrLen)) < 0) {
continue; // Error
}
//
// Run the actual server
//
GUI_VNC_Process(&_Context, _cbVNC_Send, _cbVNC_Recv, (void *)Sock);
//
// Close the connection
//
closesocket(Sock);
memset(&_Addr, 0, sizeof(struct sockaddr_in));
}
}
#ifdef RTE_CMSIS_RTOS2
static osThreadId_t s_vncTsakId = NULL;
static uint64_t _ServerTask_stk[4096 / 8];
static const osThreadAttr_t _ServerTask_attr = {
.stack_mem = &_ServerTask_stk[0],
.stack_size = sizeof(_ServerTask_stk)
};
#else
static osThreadDef(_ServerTask, osPriorityNormal, 0, 4096);
#endif
/*********************************************************************
*
* Global functions
*
**********************************************************************
*/
/*********************************************************************
*
* GUI_VNC_X_StartServer()
*
* Function description
* This routine starts a separate task for the VNC server. It
* requires that the OS and TCP/IP stack are already initialized.
*
* Parameters
* LayerIndex : Index of the GUI layer that is shown via VNC.
* ServerIndex: Zero-based server index.
*
* Return value
* O.K.: 0
*
* Additional information
* This sample is intended to be used for starting one VNC server.
* In case multiple layers shall be accessed by different server
* instances (ServerIndex) this sample needs to be modified.
*/
int GUI_VNC_X_StartServer(int LayerIndex, int ServerIndex) {
//
// Check if maximum number of VNC clients is not exceeded.
//
if (ServerIndex >= VNC_MAX_CLIENTS) {
return -1;
}
//
// Init VNC context and attach to layer (so context is
// updated if the display-layer-contents change).
//
GUI_VNC_AttachToLayer(&_Context, LayerIndex);
_Context.ServerIndex = (uint16_t)ServerIndex;
//
// Set up pointer to RFB buffer.
//
_Context.pBuffer = _acBuffer;
_Context.SizeOfBuffer = GUI_VNC_BUFFER_SIZE;
//
// Create task for VNC Server
//
#ifdef RTE_CMSIS_RTOS2
s_vncTsakId = osThreadNew(_ServerTask, NULL, &_ServerTask_attr);
#else
osThreadCreate(osThread(_ServerTask),NULL);
#endif
//
// O.k., server has been started
//
return 0;
}
/*********************************************************************
*
* void GUI_VNC_X_StopServer(void)
* 重启服务线程
*/
extern int GUI_VNC_X_ReStartServer(int LayerIndex, int ServerIndex);
int GUI_VNC_X_ReStartServer(int LayerIndex, int ServerIndex) {
(void)LayerIndex;
(void)ServerIndex;
#ifdef RTE_CMSIS_RTOS2
s_vncTsakId = osThreadNew(_ServerTask, NULL, &_ServerTask_attr);
#else
osThreadCreate(osThread(_ServerTask),NULL);
#endif
//
// O.k., server has been started
//
return 0;
}
/*********************************************************************
*
* void GUI_VNC_X_StopServer(void)
* 关掉服务线程
*/
extern void GUI_VNC_X_StopServer(void);
void GUI_VNC_X_StopServer(void)
{
osThreadTerminate(s_vncTsakId);
memset(&_Addr, 0, sizeof(struct sockaddr_in));
memset(_acBuffer,0,sizeof(_acBuffer));
}
/*********************************************************************
*
* GUI_VNC_X_getpeername()
*
* Function description
* Retrieves the IP addr. of the currently connected VNC client.
*
* Parameters
* ServerIndex: Index of server instance.
* pIPAddr:[OUT] VNC client connected: U32 IP addr. in network endianess.
* No client connected : 0
*/
void GUI_VNC_X_getpeername(int ServerIndex, U32 * pIPAddr) {
struct sockaddr_in Client;
int Len;
void * pConnection;
if ((ServerIndex >= VNC_MAX_CLIENTS) || (ServerIndex < 0)) {
return;
}
if (pIPAddr) {
*pIPAddr = _Addr.sin_addr.s_addr;
}
}
/*************************** End of file ****************************/
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发表于 2017-6-1 14:56:08
发表于 2017-6-9 08:48:40
楼主
