c++ - 中断时发送 UDP 数据包

Question

当使用 mbed 平台触发中断时，我正在尝试发送 UDP 数据包。

但是，当我尝试udp_send从中断函数调用时key_pressed，我得到sys_arch_protect 错误。

这可能是因为 UDPsocket 的某些部分没有被传递给中断函数吗？

为了简洁起见，我省略了大部分代码

在此先感谢，格雷格

/*--INCLUDES----------------------------------------------------------------------------*/
#include "mbed.h"
#include "EthernetInterface.h"


/*--CONSTANTS---------------------------------------------------------------------------*/
const int BROADCAST_PORT = 58083;
char pin_status[1] = {0};
InterruptIn push_button(SW3);

/*--FUNCTION DEFINITIONS----------------------------------------------------------------*/
void udp_send(void);
void keyPressed(void);
void keyReleased(void);

/*--------------------------------------------------------------------------------------*/
void keyPressed(void)
{
    printf("Key Pressed\r\n"); //debug
    udp_send();     //calling the function to send UDP packet, this casuses errors
}

/*--------------------------------------------------------------------------------------*/
void keyReleased( void )
{
    printf("Key Released\r\n"); //debug
}

/*--------------------------------------------------------------------------------------*/
void udp_send(void)     //sends UDP broadcast packet
{
    UDPSocket sock;
    sock.init();
    sock.set_broadcasting();
    Endpoint broadcast;
    broadcast.set_address("255.255.255.255", BROADCAST_PORT);   //broadcast UDP to all
    sock.sendTo(broadcast, pin_status, sizeof(pin_status)); //pin_status changed elsewhere
}

/*--------------------------------------------------------------------------------------*/
int main() {
    EthernetInterface eth;
    eth.init();
    eth.connect();
    printf("IP Address is %s\r\n", eth.getIPAddress());
    udp_send();     //test call to confirm UDP_send function is working (with Wireshark)

    while( 1 )
    {
        push_button.rise(keyPressed);   //debounce omitted, calls interupt
        push_button.fall(keyReleased);
        //other stuff
    }
}

Answer 1

非常感谢@Tony d，我想无论如何在中断例程中包含大函数调用并不是一个好习惯。

附上代码供以后参考；

#include "mbed.h"
#include "EthernetInterface.h"
#include "rtos.h"
#include <string>
#include "PinDetect.h"

/*--CONSTANTS---------------------------------------------------------------------------*/
const int BROADCAST_PORT = 58083;
char pin_status[1] = {0};
int global_flag;

InterruptIn push_button(SW3);

/*--FUNCTION DEFINITIONS----------------------------------------------------------------*/
void udp_send(void);
void keyPressed(void);
void keyReleased(void);

EthernetInterface eth;
Endpoint broadcast;
UDPSocket sock;

/*--------------------------------------------------------------------------------------*/
void keyPressed(void)
{
    printf("Key Pressed\r\n"); //debug
    udp_send();
}

/*--------------------------------------------------------------------------------------*/
void keyReleased( void )
{
    printf("Key Released\r\n"); //debug
}

/*--------------------------------------------------------------------------------------*/
void udp_send(void)
{
    global_flag = 1;        //sends UDP broadcast packet
        //pin_status changed elsewhere
}

/*--------------------------------------------------------------------------------------*/
int main() {
    eth.init();
    eth.connect();
    sock.init();
    sock.set_broadcasting();

    broadcast.set_address("255.255.255.255", BROADCAST_PORT);   //broadcast UDP to all
    printf("IP Address is %s\r\n", eth.getIPAddress());

    udp_send();     //test call to confirm UDP_send function is working

    while( 1 )
    {
        push_button.rise(keyPressed);   //debounce omitted, calls interupt
        push_button.fall(keyReleased);
        if (global_flag)
        {
            global_flag = 0;
            sock.sendTo(broadcast, pin_status, sizeof(pin_status));
        }
    }
}