怎么将数据从FPGA发送到PC

嗨，
好的......问题可以通过以下步骤解决，
链接：http：//lwip.wikia.com/wiki/Raw/TCP
要在TCP连接上发送数据：
调用tcp_sent（）以指定确认的回调函数。
调用tcp_sndbuf（）以查找可以发送的最大数据量。
调用tcp_write（）将数据排入队列。
调用tcp_output（）强制发送数据。
u16_t tcp_sndbuf（struct tcp_pcb * pcb）
返回输出队列中可用空间的字节数。
err_t tcp_write（struct tcp_pcb * pcb，void * dataptr，u16_t len， 
u8_t apiflags）
将参数dataptr指向的数据排入队列。
数据的长度作为len参数传递。
apiflags参数可以具有以下任一位：
TCP_WRITE_FLAG_COPY表示lwIP应分配新内存并将数据复制到其中。
如果未指定，则不应分配新内存，并且数据应仅由指针引用。
TCP_WRITE_FLAG_MORE表示不应在TCP段中设置推送标志。
如果数据长度超过当前发送缓冲区大小或者传出段的队列长度大于lwipopts.h（TCP_SND_QUEUELEN）中定义的上限，则tcp_write（）函数将失败并返回ERR_MEM。
如果函数返回ERR_MEM，则应用程序应等待，直到其他主机成功接收到某些当前排队的数据，然后重试。
err_t tcp_output（struct tcp_pcb * pcb）
强制立即发送所有入队数据。
void tcp_sent（struct tcp_pcb * pcb， 
err_t（* sent）（void * arg，struct tcp_pcb * tpcb， 
u16_t len））
指定在远程主机确认数据时应调用的回调函数。
传递给回调函数的len参数给出了上次确认确认的字节数。
在原帖中查看解决方案



以下为原文

Hi,
 
OK ... the problem can be solved by following the steps below,
 
Link : http://lwip.wikia.com/wiki/Raw/TCP
 
To send data on a TCP connection:

• Call tcp_sent() to specify a callback function for acknowledgements.
  
• Call tcp_sndbuf() to find the maximum amount of data that can be sent.
  
• Call tcp_write() to enqueue the data.
  
• Call tcp_output() to force the data to be sent.
  

u16_t tcp_sndbuf(struct tcp_pcb * pcb)Returns the number of bytes of space available in the output queue.
err_t tcp_write(struct tcp_pcb * pcb, void * dataptr, u16_t len,                 u8_t apiflags)Enqueues the data pointed to by the argument dataptr. The length of the data is passed as the len parameter.
The apiflags argument can have either of the following bits:

• TCP_WRITE_FLAG_COPY indicates that lwIP should allocate new memory and copy the data into it. If not specified, no new memory should be allocated and the data should only be referenced by pointer.
  
• TCP_WRITE_FLAG_MORE indicates that the push flag should not be set in the TCP segment.
  

The tcp_write() function will fail and return ERR_MEM if the length of the data exceeds the current send buffer size or if the length of the queue of outgoing segment is larger than the upper limit defined in lwipopts.h (TCP_SND_QUEUELEN). If the function returns ERR_MEM, the application should wait until some of the currently enqueued data has been successfully received by the other host and try again.
err_t tcp_output(struct tcp_pcb * pcb)Forces all enqueued data to be sent now.
void tcp_sent(struct tcp_pcb * pcb,               err_t (* sent)(void * arg, struct tcp_pcb * tpcb,                              u16_t len))Specifies the callback function that should be called when data has been acknowledged by the remote host. The len argument passed to the callback function gives the number of bytes that were acknowledged by the last acknowledgment.
View solution in original post

嗨，
好的......问题可以通过以下步骤解决，
链接：http：//lwip.wikia.com/wiki/Raw/TCP
要在TCP连接上发送数据：
调用tcp_sent（）以指定确认的回调函数。
调用tcp_sndbuf（）以查找可以发送的最大数据量。
调用tcp_write（）将数据排入队列。
调用tcp_output（）强制发送数据。
u16_t tcp_sndbuf（struct tcp_pcb * pcb）
返回输出队列中可用空间的字节数。
err_t tcp_write（struct tcp_pcb * pcb，void * dataptr，u16_t len， 
u8_t apiflags）
将参数dataptr指向的数据排入队列。
数据的长度作为len参数传递。
apiflags参数可以具有以下任一位：
TCP_WRITE_FLAG_COPY表示lwIP应分配新内存并将数据复制到其中。
如果未指定，则不应分配新内存，并且数据应仅由指针引用。
TCP_WRITE_FLAG_MORE表示不应在TCP段中设置推送标志。
如果数据长度超过当前发送缓冲区大小或者传出段的队列长度大于lwipopts.h（TCP_SND_QUEUELEN）中定义的上限，则tcp_write（）函数将失败并返回ERR_MEM。
如果函数返回ERR_MEM，则应用程序应等待，直到其他主机成功接收到某些当前排队的数据，然后重试。
err_t tcp_output（struct tcp_pcb * pcb）
强制立即发送所有入队数据。
void tcp_sent（struct tcp_pcb * pcb， 
err_t（* sent）（void * arg，struct tcp_pcb * tpcb， 
u16_t len））
指定在远程主机确认数据时应调用的回调函数。
传递给回调函数的len参数给出了上次确认确认的字节数。



以下为原文

Hi,
 
OK ... the problem can be solved by following the steps below,
 
Link : http://lwip.wikia.com/wiki/Raw/TCP
 
To send data on a TCP connection:

• Call tcp_sent() to specify a callback function for acknowledgements.
  
• Call tcp_sndbuf() to find the maximum amount of data that can be sent.
  
• Call tcp_write() to enqueue the data.
  
• Call tcp_output() to force the data to be sent.
  

u16_t tcp_sndbuf(struct tcp_pcb * pcb)Returns the number of bytes of space available in the output queue.
err_t tcp_write(struct tcp_pcb * pcb, void * dataptr, u16_t len,                 u8_t apiflags)Enqueues the data pointed to by the argument dataptr. The length of the data is passed as the len parameter.
The apiflags argument can have either of the following bits:

• TCP_WRITE_FLAG_COPY indicates that lwIP should allocate new memory and copy the data into it. If not specified, no new memory should be allocated and the data should only be referenced by pointer.
  
• TCP_WRITE_FLAG_MORE indicates that the push flag should not be set in the TCP segment.
  

The tcp_write() function will fail and return ERR_MEM if the length of the data exceeds the current send buffer size or if the length of the queue of outgoing segment is larger than the upper limit defined in lwipopts.h (TCP_SND_QUEUELEN). If the function returns ERR_MEM, the application should wait until some of the currently enqueued data has been successfully received by the other host and try again.
err_t tcp_output(struct tcp_pcb * pcb)Forces all enqueued data to be sent now.
void tcp_sent(struct tcp_pcb * pcb,               err_t (* sent)(void * arg, struct tcp_pcb * tpcb,                              u16_t len))Specifies the callback function that should be called when data has been acknowledged by the remote host. The len argument passed to the callback function gives the number of bytes that were acknowledged by the last acknowledgment.

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以下为原文

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