Roman Bürkle

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9 years, 4 months ago.

USB Host

Hi guys,

I have a microcontroller LPC1768 and i want to work with the USB funktion. My microcontroller has an output ( D+, D-) , so i downloaded the USB Host ( http://www.lpcware.com/content/nxpfile/usbhostlite-lpc17xx) .

My questions are: 1. Do I need an additional power supply or current supply for the VDD , that it works ( to connect to a USB Stick ) ? 2. Have somebody know-how to the USB Host and can give me some tips for the beginning?

Question relating to:

Last updated: 30 Jun 2020
Rapid Prototyping for general microcontroller applications, Ethernet, USB and 32-bit ARM® Cortex™-M3 based designs

1 Answer

Adam Green
9 years, 4 months ago.

You can start with this Handbook page. It gives an overview of using the USBHost functionality for mass storage devices. On the page it mentions that if your mbed keeps resetting when you plug in the USB stick, then you will need to provide your own 5V source and not rely on VU to source the current for the stick. There is an overload protection chip on the mbed for the USB 5V line to make sure that you don't use too much current and if you do, you will see those resets.

I hope that helps,

Adam