Software⏱️ 2 min read📅 2026-05-30

How to Fix 0xd Error – Tracing data to / from serial driver ft200xd, finding the file descriptor

Find file descriptor for ft200xd chip driver.

Quick Answer: Use the ls -l /proc/tty/driver/ft200xd command to find the file descriptor, then use strace with the correct file descriptor.

📋 Table of Contents

  1. 🔍 Finding the File Descriptor
  2. 🛠️ Additional Tip
  3. 🎯 Final Words

To find the file descriptor for your ft200xd serial driver, you can use the ls /proc/tty/driver command. This will list all available serial devices and their corresponding major numbers.

🔍 Finding the File Descriptor

  • Run ls /proc/tty/driver to list all serial devices:
ls /proc/tty/driver | grep ft200xd

This should output the major number of your ft200xd driver, which you can use with strace. For example:

strace -r read=0 /dev/ttyFT200XD0

🛠️ Additional Tip

Using strace with the Major Number

  1. Step 1: Identify the major number of your ft200xd driver from the output of ls /proc/tty/driver | grep ft200xd.

🎯 Final Words

By following these steps, you should be able to find the file descriptor for your ft200xd serial driver and successfully use strace to observe data transmission.

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