This mainly moves the STM32 timers' code to the common area.

F2 and F4 have a common section to deal with the options register (TIM2 and TIM5 only)
L1 has been made common with timer_common_all as its options register has very different settings to F2/F4. Code is in the L1/timer.c L1/timer.h files

Note that F3 and F05 timers should fit into this scheme, with F3 having additional features.

Bundled with this is L1/pwr.h to change a documentation setting
Also all the Doxyfiles have added "ENABLE_PREPROCESSING = NO" to fix a problem introduced by commit 118.

lib/stm32/f4/Makefile

@@ -19,8 +19,8 @@
 
 LIBNAME		= libopencm3_stm32f4
 
-PREFIX	?= arm-none-eabi
-# PREFIX		?= arm-elf
+PREFIX	        ?= arm-none-eabi
+# PREFIX	?= arm-elf
 CC		= $(PREFIX)-gcc
 AR		= $(PREFIX)-ar
 CFLAGS		= -Os -g \
@@ -33,16 +33,17 @@ CFLAGS		= -Os -g \
 		  -ffunction-sections -fdata-sections -MD -DSTM32F4
 # ARFLAGS	= rcsv
 ARFLAGS		= rcs
-OBJS		= rcc.o gpio.o flash.o exti2.o pwr.o timer.o \
-		  usb.o usb_standard.o usb_control.o usb_fx07_common.o usb_f107.o \
-		  usb_f207.o adc.o dma.o \
-		  pwr_common_all.o \
-		  gpio_common_all.o gpio_common_f24.o dma_common_f24.o spi_common_all.o \
-		  dac_common_all.o usart_common_all.o iwdg_common_all.o i2c_common_all.o \
-		  crc_common_all.o \
-		  rtc_common_bcd.o \
-		  rtc.o \
-		  can.o
+
+OBJS		= adc.o can.o gpio.o exti2.o flash.o pwr.o rcc.o
+
+OBJS            += crc_common_all.o dac_common_all.o dma_common_f24.o \
+                   gpio_common_all.o gpio_common_f24.o i2c_common_all.o \
+                   iwdg_common_all.o pwr_common_all.o rtc_common_bcd.o \
+                   spi_common_all.o timer_common_all.o timer_common_f24.o \
+                   usart_common_all.o
+
+OBJS            += usb.o usb_standard.o usb_control.o usb_fx07_common.o \
+		   usb_f107.o usb_f207.o
 
 VPATH += ../../usb:../:../../cm3:../common