Mbed Cortex-m 硬故障，当通过 TCP 发送数据

Question

我有一个TCPSocket*对象，它保存着与客户端的连接。此对象被传递给另一个对象以将数据发送回客户端：

uint32_t count = 10;
char* message = new char[4];
message[0] = count & 0xff;
message[1] = (count >> 8) & 0xff;
message[2] = (count >> 16) & 0xff;
message[3] = (count >> 24) & 0xff;
client->send(&message, 4);

调用程序的这一部分时，串行行上出现以下内容，并且客户端不会接收到任何数据：

++ MbedOS Fault Handler ++

                                    FaultType: HardFault

                                                        Context:
R0   : 00000000
R1   : 10008000
R2   : 00000004
R3   : 2007C000
R4   : 10000914
        R5   : 00000000
                       R6   : 00000000
                                      R7   : 10004330
                                                     R8   : 10004320
R9   : FFFFF435
R10  : 00000000
R11  : 00000000
R12  : 00012AC1
SP   : 10002AF0
            LR   : 0000D1A1
                           PC   : 00005938
                                          xPSR : 21000000
                                                         PSP  : 10002AD0
MSP  : 10007FD8
CPUID: 412FC230
HFSR : 40000000
MMFSR: 00000000
 BFSR : 00000082
               UFSR : 00000000
                               DFSR : 0000000A
                                              AFSR : 00000000
                                                             BFAR : 10008010
Mode : Thread
Priv : Privileged
Stack: PSP

-- MbedOS Fault Handler --



           ++ MbedOS Error Info ++
                                  Error Status: 0x80FF013D Code: 317 Module: 255
Error Message: Fault exception
Location: 0xD337
Error Value: 0x5938
              Current Thread: main  Id: 0x10002B48 Entry: 0xD7D7 StackSize: 0x1000 StackMem: 0x10001B48 SP: 0x10007F88
For more info, visit: https://armmbed.github.io/mbedos-error/?error=0x80FF013D
-- MbedOS Error Info --

一切都在一个线程中，所以我看不出可能导致这种情况的原因。

这些是该计划的相关部分：

主要：

// Network interface
EthernetInterface net;
TCPSocket listener; //listens for incoming connection requests
TCPSocket* client;
CommandProcessor commandProcessor(client);
int main() {
int remaining;
int rcount;
char *p;
char *buffer = new char[16];
nsapi_size_or_error_t result;
int n = net.set_network("192.168.1.103","255.255.255.0","192.168.1.2");
pc.printf("n Success? %dn", n);
net.connect();
listener.open(&net);
listener.bind(3045);
listener.listen(1);
client = listener.accept(NULL);
client->set_timeout(1000);
led1 = 1;
while(1) {
int remaining = 16;
int rcount = 0;
p = buffer;
while (remaining > 0 && 0 < (result = client->recv(p, remaining))) {
p += result;
rcount += result;
remaining -= result;
}
if (remaining == 0) //full message received
{
commandProcessor.process(buffer);
}
}
}

命令处理器：

CommandProcessor::CommandProcessor(TCPSocket* client)
{
this->client = client;
}
void CommandProcessor::process(char* message)
{
switch(message[0]) { //Command is first byte of message
case 0x3: { 
uint32_t count = 10 ;
char* message = new char[4];
message[0] = count & 0xff;
message[1] = (count >> 8) & 0xff;
message[2] = (count >> 16) & 0xff;
message[3] = (count >> 24) & 0xff;
client->send(message, 4);
}
}
}

Answer 1

当你调用commandProcessor.process(buffer)时，commandProcessor的client是NULL的。

为什么不在从accept()获取指向套接字的指针后创建CommandProcessor实例。

CommandProcessor* commandProcessor;
client = listener.accept(NULL);
commandProcessor = new CommandProcessor(client);
commandProcessor->process(buffer);

或者，您可以使用这样的函数设置client。

void CommandProcessor::setClient(TCPSocket* client) {
this->client = client;
}

用法：

client = listener.accept(NULL);
commandProcessor.setClient(client);