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Updating USB core to work at 8 MHz (different PLLCSR value).

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This commit is contained in:
David A. Mellis
2012-10-18 15:03:23 -04:00
parent 9a13d211ba
commit 7e12aebbdb
1 changed files with 4 additions and 0 deletions
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4
hardware/arduino/cores/arduino/USBCore.cpp
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@ -638,7 +638,11 @@ void USBDevice_::attach()
_usbConfiguration = 0;
UHWCON = 0x01; // power internal reg
USBCON = (1<<USBE)|(1<<FRZCLK); // clock frozen, usb enabled
#if F_CPU == 16000000UL
PLLCSR = 0x12; // Need 16 MHz xtal
#elif F_CPU == 8000000UL
PLLCSR = 0x02; // Need 8 MHz xtal
#endif
while (!(PLLCSR & (1<<PLOCK))) // wait for lock pll
;