Modify Raspberry Pi USB Port Current Limit

January 09, 2018 · 884 · 3 min

In use, I found that when the mobile hard disk is connected, the hard disk will make an abnormal noise and cannot be read in the system. I studied it for a long time because the current was not enough, because I also connected a USB card. A solution was found on the Internet to control the current size by modifying the config. (maximum 1.2A)

Notes

First, it is necessary to reasonably evaluate whether the overload current is within an acceptable range. If the default value exceeds 600mA by more than 50%, the active HUB scheme is recommended for wall cracking.
This program is not available for the Raspberry Pi Zero. It also does not apply to Raspbian systems prior to 2017-04-10.
After using this program, the Raspberry Pi will lose the warranty conditions.
Share this program is only for professional players to understand this configuration item. If you can't understand or can't reasonably evaluate the load, please don't read it. We are very reluctant to see your tree because of neglecting the above matters. The Raspberry Pi motherboard was scrapped due to overload. At the same time, it is exempt from any possible loss arising from the attempt.

Since the USB current of the Raspberry Pi is limited by the USB current protection chip, a larger current can be realized by bypassing the USB current protection chip (that is, not allowing current to flow from the current protection chip). The specific configuration needs to modify the /boot/config.txt file and add three lines at the end.

max_usb_current=1
current_limit_override=0x5A000020
avoid_warnings=2

Due to power chip limitations, the maximum current is 1.2A. Restart the Raspberry Pi to take effect. There used to be a raspberry pie in front of you to work normally, you have to cherish it~ (use caution)

Reference material

树莓派实验室

Tags :

# Linux # RaspberryPi

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