传输较大的数据USB量 [英] Transferring larger amounts of data USB

问题描述

嘿，我一直在努力工作了一段时间，但我只是没有得到其中

我想获得字节从USB设备，这工作正常的一两行进来的，但是当它到达了不少这是行不通的。

我用这行code引入数据：

  conn.bulkTransfer（亿品，缓冲，57600，500）;
 

有没有什么办法了一遍又一遍，直到有进来的没有更多的数据做了一个USB传输？因为数据进来的量可以是从8个字节任何一个几MB

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在回答user387184

可否像这样的工作来传输数据，大量的？

 而（conn.bulkTransfer（亿品，缓冲，57600，500）0）{
    \\做一些东西
}
 

解决方案

如果您的USB连接真正停止接收数据，如果没有更多的数据，那么所有你需要做的就是把一段时间receivedBufferIsNotEmpty在你的说法，因为：

  lenOfReceivedBuffer = conn.bulkTransfer（亿品，缓冲，57600，500）;
 

获得 0 lenOfReceivedBuffer 如果没有更多的数据可以使用500毫秒超时的端口上找到。

您也可以增加超时了一下，如果你的发送端是太慢了。

Hey I have been trying to work on this for some time but I am just getting no where

I am trying to get bytes in from a USB device, this works fine for one or two lines coming in but when it gets to quite a few it just doesn't work.

I am using this line of code to bring in data:

conn.bulkTransfer(epIN, buffer, 57600, 500);

is there any way to do a USB transfer over and over again until there is no more data coming in? Because the amount of data coming in can be anything from 8 bytes to a few MB

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In reply to user387184

Would something like this work to transfer large amounts of data?

while ( conn.bulkTransfer(epIN, buffer, 57600, 500) > 0 ){
    \\do some stuff
}

解决方案

If your USB connection really stops receiving data if there is no more data then all you need to do is to put a while receivedBufferIsNotEmpty around your statement since:

lenOfReceivedBuffer = conn.bulkTransfer(epIN, buffer, 57600, 500);

gets 0 in lenOfReceivedBuffer if no more data can be found on the port using 500ms timeout.

You may also increase the timeout a bit, if your sending side is too slow.

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