X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/fa456ce531b75e2dd3c7c0ecb971e3ede36f5d35..99145a8d7c88d9af065cfb7f5e8507d5b65ff811:/LUFA/Drivers/USB/LowLevel/LowLevel.h

diff --git a/LUFA/Drivers/USB/LowLevel/LowLevel.h b/LUFA/Drivers/USB/LowLevel/LowLevel.h
index faafbd7bf..9721baca0 100644
--- a/LUFA/Drivers/USB/LowLevel/LowLevel.h
+++ b/LUFA/Drivers/USB/LowLevel/LowLevel.h
@@ -66,7 +66,12 @@
 		#endif
 
 	/* Preprocessor Checks and Defines: */
-		#if (F_CPU == 8000000)
+		#if !defined(F_CLOCK)
+			#error F_CLOCK is not defined. You must device F_CLOCK to the frequency of the unprescaled input clock in your project makefile.
+			#define F_CLOCK 0
+		#endif
+	
+		#if (F_CLOCK == 8000000)
 			#if (defined(__AVR_AT90USB82__) || defined(__AVR_AT90USB162__))
 				#define USB_PLL_PSC                0
 			#elif (defined(__AVR_AT90USB646__)  || defined(__AVR_AT90USB647__)  || \
@@ -76,7 +81,7 @@
 			#elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))
 				#define USB_PLL_PSC                0
 			#endif
-		#elif (F_CPU == 16000000)
+		#elif (F_CLOCK == 16000000)
 			#if (defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_ATmega32U6__))
 				#define USB_PLL_PSC                ((1 << PLLP2) | (1 << PLLP1))
 			#elif (defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__))