How to add 14.7456MHz to F_CPU supported?

General discussions about V-USB, our firmware-only implementation of a low speed USB device on Atmel's AVR microcontrollers
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lachini
Posts: 3
Joined: Fri Aug 15, 2014 1:54 pm

How to add 14.7456MHz to F_CPU supported?

Post by lachini » Fri Aug 15, 2014 2:03 pm

Hi,
How to can edit usbdrvasm to add new F_CPU?
I need to add 14.7456MHz crystal to my hw.
please help me.
Thanks!
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blargg
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Rank 3
Posts: 102
Joined: Thu Nov 14, 2013 10:01 pm

Re: How to add 14.7456MHz to F_CPU supported?

Post by blargg » Fri Aug 15, 2014 10:45 pm

To add a new crystal frequency, you need to write a new usbdrvasm147456.s file, which for someone experienced with vusb might take a few weeks. In other words, it's not at all practical. :)
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