从TCP接收数据(FreeRTOS,LWIP)

时间:2016-04-05 13:07:50

标签: tcp arm freertos lwip

当我开始这个程序(见下文)时,一切正常。但是当我将返回数据禁用回TPCIP时,编程工作正常。

这是程序,工作正常:[1]:http://s27.postimg.org/seixg63hf/problem_2.jpg

static err_t prijata_data(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
{
    void *data; 
    if (err == ERR_OK && p != NULL) {
        // information of receive data
        tcp_recved(pcb, p->tot_len);
        //free buffer
        pbuf_free(p);   
        data = p->payload;  //copy value to send out of queue
        xQueueSend(queue_ethernet, &data, 10);  //send value to queue
        //send data out
        err = tcp_write(pcb, p->payload, p->len, TCP_WRITE_FLAG_COPY);  
        tcp_sent(pcb, NULL); // No need to call back
    } 
    else 
    {
        pbuf_free(p);
    }
    if (err == ERR_OK && p == NULL) {
        close_conn(pcb);
    }
    return ERR_OK;
}

这个功能在这里: 小号

static err_t prijimani_dat(void *arg, struct tcp_pcb *pcb, err_t err){
    LWIP_UNUSED_ARG(arg);
    LWIP_UNUSED_ARG(err);
    tcp_setprio(pcb, TCP_PRIO_MIN);
    tcp_recv(pcb, prijata_data);
    tcp_err(pcb, server_err); 
    tcp_poll(pcb, server_poll, 4);
    return ERR_OK;
}

在任务FreeRTOS中实现完成通信:

extern void TCP_connection(void *pvParameters)
{
    UNUSED(pvParameters);
    const portTickType xDelayTime = 5 / portTICK_RATE_MS;

    struct tcp_pcb *tcp_server;
    tcp_server = tcp_new();

    tcp_bind(tcp_server, IP_ADDR_ANY, TCP_PORT);

    while (1){
        tcp_server = tcp_listen(tcp_server);
        tcp_accept(tcp_server, prijimani_dat);

        vTaskDelay(xDelayTime);
    }
}

但是当我只能从TCP读取数据时,我不希望将数据反馈给TCPIP,程序运行正常。 [2]:http://s21.postimg.org/wlhqh31g5/problem_1.jpg

static err_t prijata_data(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err){
    void *data;

    if (err == ERR_OK && p != NULL) {
        /* information of receive data */
        tcp_recved(pcb, p->tot_len);

        //free buffer
        pbuf_free(p); 

        data = p->payload;  /*copy value to send out of queue*/
        xQueueSend(queue_ethernet, &data, 10);  //send value to queue
    } 
    else 
    {
        pbuf_free(p);
    }

    if (err == ERR_OK && p == NULL) {
        close_conn(pcb);
    }
    return ERR_OK;
}

3 个答案:

答案 0 :(得分:0)

有一个非常古老的例子,说明如何在FreeRTOS Interactive site中使用带有lwIP的FreeRTOS。尽管此示例中包含的许多代码现已被取代,但与lwIP的集成仍应有效并为您提供参考。

如果您使用FreeRTOS+TCP examples page上列出的处理器之一(FreeRTOS + TCP是FreeRTOS自己的TCP / IP堆栈),那么可能会提供进一步的参考。

答案 1 :(得分:0)

我正在全力以赴。

有任何错误,但是什么?当我尝试ping时,一切都正确完成。

C:\>ping 192.168.0.145 -n 10

Pinging 192.168.0.145 with 32 bytes of data:
Reply from 192.168.0.145: bytes=32 time=2ms TTL=255
Reply from 192.168.0.145: bytes=32 time=4ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time=1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time=1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255
Reply from 192.168.0.145: bytes=32 time<1ms TTL=255

Ping statistics for 192.168.0.145:
    Packets: Sent = 10, Received = 10, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 4ms, Average = 0ms

答案 2 :(得分:0)

确定。我很蠢。错误在于:

我创建了freeRTOS任务,我每5毫秒在循环中调用两个函数。

这是错的:

extern void TCP_connection(void *pvParameters)
{
    UNUSED(pvParameters);
    const portTickType xDelayTime = 5 / portTICK_RATE_MS;

    struct tcp_pcb *tcp_server;
    tcp_server = tcp_new();

    if (tcp_bind(tcp_server, IP_ADDR_ANY, TCP_PORT) != ERR_OK)
        return;

    while (1){  
    tcp_server = tcp_listen(tcp_server);
    tcp_accept(tcp_server, server_accept);

        vTaskDelay(xDelayTime);
    }
}

这很好

extern void TCP_connection(void *pvParameters)
{
    UNUSED(pvParameters);
    const portTickType xDelayTime = 5 / portTICK_RATE_MS;

    struct tcp_pcb *tcp_server;
    tcp_server = tcp_new();

    if (tcp_bind(tcp_server, IP_ADDR_ANY, TCP_PORT) != ERR_OK)
        return;

    tcp_server = tcp_listen(tcp_server);
    tcp_accept(tcp_server, server_accept);

    while (1){  
        vTaskDelay(xDelayTime);
    }
}