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我对 LWFTP 库有疑问（来自https://github.com/gezedo）。我正在使用带有 RAW API 的 lwIP。板子从不发送任何 TCP 信号（应该发送 SYN 消息）。我的代码是下一个：

/**************************** sys_main.c *************************************/

#include "sys_common.h"

/* USER CODE BEGIN (1) */
/* Include FreeRTOS scheduler files */
#include "FreeRTOS.h"
#include "os_task.h"
#include "os_queue.h"

#include "het.h"
#include "esm.h"

#include "tcp_client.h"
#include "ping.h"
#include "sci.h"
#include "lwftp.h"


#include "includes.h"

extern void EMAC_LwIP_Main (uint8 * emacAddress);


uint8   emacAddress[6U] =   {0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU, 0xFFU};
uint32  emacPhyAddress  =   0U;


/********************************************************************************/

int min(int num1, int num2);

int min(int num1, int num2)
{
    return (num1 > num2 ) ? num2 : num1;
}


static void ftp_retr_callback(void *arg, int result)
{
    lwftp_session_t *s = (lwftp_session_t*)arg;

    if ( result != LWFTP_RESULT_OK ) {
      //  ////LOG_ERROR("retr failed (%d)", result);
        return lwftp_close(s);
    }
    // Test is done
    lwftp_close(s);
}

static unsigned int data_sink(void *arg, const char* ptr, unsigned int len)
{
    static const unsigned int mylen = 12345;
    static char * const myconfig = (char*)0x20000000;
    static unsigned int offset = 0;

    if (ptr) {
        len = min( len, mylen-offset );
        memcpy( myconfig+offset, ptr, len );
        offset += len;
    }
    return len;
}

static void ftp_stor_callback(void *arg, int result)
{
    lwftp_session_t *s = (lwftp_session_t*)arg;
    err_t error;

    if ( result != LWFTP_RESULT_OK ) {
     //   ////LOG_ERROR("stor failed (%d)", result);
        return lwftp_close(s);
    }
    // Continue with RETR request
    s->data_sink = data_sink;
    s->done_fn = ftp_retr_callback;
    s->remote_path = "configfile";
    error = lwftp_retrieve(s);
    if ( error != LWFTP_RESULT_INPROGRESS ) {
      //  ////LOG_ERROR("lwftp_retrieve failed (%d)", error);
    }
    // FTP session will continue with RETR and sink callbacks
}

static unsigned int data_source(void *arg, const char** pptr, unsigned int maxlen)
{
    static const unsigned int mylen = 12345;
    static const char * const mydata = (char*)0x20000000;
    static unsigned int offset = 0;
    unsigned int len = 0;

    // Check for data request or data sent notice
    if (pptr) {
        len = mylen - offset;
        if ( len > maxlen ) len = maxlen;
        *pptr = mydata + offset;
    } else {
        offset += maxlen;
        if ( offset > mylen ) offset = mylen;
    }
    return len;
}

static void ftp_connect_callback(void *arg, int result)
{
    lwftp_session_t *s = (lwftp_session_t*)arg;
    err_t error;

    if ( result != LWFTP_RESULT_LOGGED ) {
        ////LOG_ERROR("login failed (%d)", result);
        return lwftp_close(s);
    }
    // Continue with STOR request
    s->data_source = data_source;
    s->done_fn = ftp_stor_callback;
    s->remote_path = "logfile";
    error = lwftp_store(s);
    if ( error != LWFTP_RESULT_INPROGRESS ) {
        ////LOG_ERROR("lwftp_store failed (%d)", error);
    }
    // FTP session will continue with STOR and source callbacks
}

static void ftp_test(void)
{
    static lwftp_session_t s;   // static content for the whole FTP session
    err_t error;

    // Initialize session data
    memset(&s, 0, sizeof(s));
    IP4_ADDR(&s.server_ip, 192,168,0,20);
    s.server_port = 7070;
    s.done_fn = ftp_connect_callback;
    s.user = "username";
    s.pass = "password";
    // We have no extra user data, simply use the session structure
    s.handle = &s;

    // Start the connection state machine
    error = lwftp_connect(&s);
    if ( error != LWFTP_RESULT_INPROGRESS ) {
        ////LOG_ERROR("lwftp_connect failed (%d)", error);
    }
    // FTP session will continue with the connection callback
}


/********************************************************************************/

int main(void)
{
    EMAC_LwIP_Main (emacAddress);
    ftp_test();

    while(1);

    return 0;
}

函数 ftp_test() 调用 lwftp_connect（在 lwftp.c 中，来自 Gezedo 的 github），但从不发送任何 TCP 消息。我正在使用 TMS570LS3137 板。

非常感谢 ！！

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