diff options
Diffstat (limited to 'LUFA')
| -rw-r--r-- | LUFA/Drivers/USB/Core/XMEGA/USBController_XMEGA.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/LUFA/Drivers/USB/Core/XMEGA/USBController_XMEGA.c b/LUFA/Drivers/USB/Core/XMEGA/USBController_XMEGA.c index f8b0fc6af..b5de862f1 100644 --- a/LUFA/Drivers/USB/Core/XMEGA/USBController_XMEGA.c +++ b/LUFA/Drivers/USB/Core/XMEGA/USBController_XMEGA.c @@ -109,15 +109,25 @@ void USB_Disable(void) void USB_ResetInterface(void) { + uint8_t PrescalerNeeded; + uint8_t nbit = 0; + #if defined(USB_DEVICE_OPT_FULLSPEED) if (USB_Options & USB_DEVICE_OPT_LOWSPEED) - CLK.USBCTRL = (((F_USB / 6000000) - 1) << CLK_USBPSDIV_gp); + PrescalerNeeded = F_USB / 6000000; else - CLK.USBCTRL = (((F_USB / 48000000) - 1) << CLK_USBPSDIV_gp); + PrescalerNeeded = F_USB / 48000000; #else - CLK.USBCTRL = (((F_USB / 6000000) - 1) << CLK_USBPSDIV_gp); + PrescalerNeeded = F_USB / 6000000; #endif + while (PrescalerNeeded && nbit < 7) { + PrescalerNeeded >>= 1; + nbit++; + } + + CLK.USBCTRL = (nbit - 1) << CLK_USBPSDIV_gp; + if (USB_Options & USB_OPT_PLLCLKSRC) CLK.USBCTRL |= (CLK_USBSRC_PLL_gc | CLK_USBSEN_bm); else |