如何在Linux中找到USB转并口设备的基地址？
我正在 Ubuntu 中用 C 语言进行 IO 编程。我需要端口的基地址来写入数据。
我的笔记本电脑没有并行端口。所以我买了一个 USB 转并行端口连接器。我插入设备并在 /dev/usb/lp0 中检测到它，
我运行“lsusb”来查看设备列表，我也可以看到 ID。但是我怎样才能得到基地址呢？对于通常的硬件并行设备来说，基地址是0x0378。使用 USB 转并行设备时未检测到此地址。
请帮忙。
I am doing IO programming in C in Ubuntu. And I need the base address of the port to write data.
My laptop dont have a parallel port. So I bought a USB to Parallel port connector. I plugged in the device and its getting detected in /dev/usb/lp0
I ran "lsusb" to see the list of devices and I can see the ID also. But how can I get the base address ? For the usual hardware parallel devices, the base address is 0x0378. this address is not getting detected while using USB to Parallel device.
Please help.
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USB 并行端口没有基址 - 这对于 USB 来说不是一个有意义的概念。恐怕通过
in和out指令在 PC 硬件上执行 I/O 的日子几年前就结束了，尽管许多旧教程仍然存在于网络上。您可以将字节作为字符设备写入并行端口，这些字节将出现在打印机端口引脚上。 USB 适配器将期望另一端像打印机一样完全握手数据。如果您想要进行通用 I/O 原型设计，那么使用简单的 USB 微控制器（例如 Arduino）可能会更好。
此处进一步讨论。
A USB parallel port doesn't have a base address - it's not a meaningful concept for USB. I'm afraid the days of doing I/O on PC hardware via
inandoutinstructions ended a few years ago, though lots of old tutorials still survive on the web.You can write bytes to the parallel port as a character device, and these will appear on the printer port pins. The USB adapter will expect the other end to handshake data exactly like a printer. If you want to do general I/O prototyping, you're probably better off with a simple USB microcontroller like an Arduino.
Further discussion here.
如果您仍然有兴趣使用此 USB 到并行打印机设备进行自己的位操作，请务必了解其内置固件始终允许控制 D0.. D7、INIT（作为输出）、/ERR、ONL、PE（作为输入） ，但/ACK、BUSY（输入）、/STB、/AF从不 strong>、/SEL（输出）引脚。
并且您需要一个8位锁存器（例如74HCT574）来在选通时捕获数据。
请参阅此处 (https://www-user.tu-chemnitz.de/~ygu/巴斯特莱克/PC/USB2LPT/faq#DIY）
特别是对于可能的数据速率。
从软件方面访问有点复杂但可能，并且您可能需要重新构建软件和硬件才能使此类适配器可用。我不知道 Linux 情况下如何访问，但恕我直言，你不需要编写内核模式驱动程序。
If you are still interested to use this USB-to-parallel-printer device for your own bit-banging, it's important to know that their built-in firmware always allows controlling of D0..D7, INIT (as outputs), /ERR, ONL, PE (as inputs), but never for /ACK, BUSY (inputs), /STB, /AF, /SEL (outputs) pins.
And you need an 8-bit latch (e.g. 74HCT574) for catching data while strobing.
See here (https://www-user.tu-chemnitz.de/~ygu/bastelecke/PC/USB2LPT/faq#DIY)
especially for possible data rates.
Accessing from software side is a bit complicated but possible, and you may have to re-structure your software and hardware for making such adapters useable. I don't know for Linux case how to access, but IMHO you don't need to write a kernel-mode driver.