USB manual PLL control

lib/lufa_config.h

@@ -7,7 +7,7 @@
 #define FIXED_NUM_CONFIGURATIONS 1
 #define INTERRUPT_CONTROL_ENDPOINT
 #define USE_FLASH_DESCRIPTORS
-#define USE_STATIC_OPTIONS (USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)
+#define USE_STATIC_OPTIONS (USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_MANUAL_PLL)
 #define NO_INTERNAL_SERIAL
 #define NO_DEVICE_SELF_POWER
 #define NO_DEVICE_REMOTE_WAKEUP

src/modules/usb_cdc.cpp

@@ -90,6 +90,14 @@ namespace usb {
 CDC cdc;
 
 void CDC::Init() {
+#if defined(USE_STATIC_OPTIONS) && (USE_STATIC_OPTIONS & USB_OPT_MANUAL_PLL)
+#if defined(USB_SERIES_4_AVR)
+	PLLFRQ = ((1 << PLLUSB) | (1 << PDIV3) | (1 << PDIV1));
+#endif
+	USB_PLL_On();
+	while (!(USB_PLL_IsReady()));
+#endif
+
     USB_Init();
 
     /* Create a regular character stream for the interface so that it can be used with the stdio.h functions */