diff options
Diffstat (limited to 'Demos/MassStorage')
-rw-r--r-- | Demos/MassStorage/makefile | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/Demos/MassStorage/makefile b/Demos/MassStorage/makefile index 82e10908c..2f17228af 100644 --- a/Demos/MassStorage/makefile +++ b/Demos/MassStorage/makefile @@ -90,6 +90,20 @@ BOARD = USBKEY F_CPU = 8000000
+# Input clock frequency.
+# This will define a symbol, F_CLOCK, in all source code files equal to the
+# input clock frequency (before any prescaling is performed). This value may
+# differ from F_CPU if prescaling is used on the latter, and is required as the
+# raw input clock is fed directly to the PLL sections of the AVR for high speed
+# clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
+# at the end, this will be done automatically to create a 32-bit value in your
+# source code.
+#
+# If no clock division is performed on the input clock inside the AVR (via the
+# CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
+F_CLOCK = 8000000
+
+
# Output format. (can be srec, ihex, binary)
FORMAT = ihex
@@ -161,8 +175,9 @@ CSTANDARD = -std=gnu99 # Place -D or -U options here for C sources
-CDEFS = -DF_CPU=$(F_CPU)UL -DBOARD=BOARD_$(BOARD) -DUSE_NONSTANDARD_DESCRIPTOR_NAMES
-CDEFS += -DUSB_DEVICE_ONLY -DUSE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
+CDEFS = -DF_CPU=$(F_CPU)UL -DF_CLOCK=$(F_CLOCK)UL -DBOARD=BOARD_$(BOARD)
+CDEFS += -DUSE_NONSTANDARD_DESCRIPTOR_NAMES -DUSB_DEVICE_ONLY
+CDEFS += -DUSE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
# Place -D or -U options here for ASM sources
|