Restructure libs source to support multi platform

The "libstm32l_discovery" was actually the ST std periph library, plus the
CMSIS core files.  Renamed it as such, and restructured the directories and
naming to make this easier to contain the std periph drivers for more than
just one board.

Verified with the LCD demo makefile, and loading it in sram again.

example/lcd/Makefile

@@ -7,11 +7,20 @@ CFLAGS+=-mcpu=cortex-m3 -ffreestanding -nostdlib -nostdinc
 
 CFLAGS+=-I.
 
-# stm32l_discovery lib
-CFLAGS+=-I../libstm32l_discovery/inc
-CFLAGS+=-I../libstm32l_discovery/inc/base
-CFLAGS+=-I../libstm32l_discovery/inc/core_support
-CFLAGS+=-I../libstm32l_discovery/inc/device_support
+
+PLATFORM=stm32l1xx
+LIBS_STM_PATH=../libs_stm
+
+INC_CORE_SUPPORT=$(LIBS_STM_PATH)/inc/core_support
+SRC_CORE_SUPPORT=$(LIBS_STM_PATH)/inc/core_support
+INC_DEVICE_SUPPORT=$(LIBS_STM_PATH)/inc/device_support
+INC_PLATFORM=$(LIBS_STM_PATH)/inc/$(PLATFORM)
+
+CFLAGS+=-I$(INC_CORE_SUPPORT)
+CFLAGS+=-I$(INC_DEVICE_SUPPORT)
+CFLAGS+=-I$(INC_PLATFORM)
+CFLAGS+=-I$(LIBS_STM_PATH)/inc/base
+
 
 # to run from SRAM
 CFLAGS+=-Wl,-T,linker_stm32l.lds
@@ -25,7 +34,7 @@ OBJS=$(SRCS:.c=.o)
 all: $(ELF)
 
 $(ELF): $(OBJS)
-	$(CC) $(CFLAGS) -o $@ $(OBJS) -L../libstm32l_discovery/build -lstm32l_discovery
+	$(CC) $(CFLAGS) -o $@ $(OBJS) -L$(LIBS_STM_PATH)/build -lstm32l_discovery
 
 %.o: %.c
 	$(CC) $(CFLAGS) -c -o $@ $^

example/libs_stm/build/Makefile

@@ -0,0 +1,37 @@
+LIB = libstm32l_discovery.a
+
+CC = arm-none-eabi-gcc
+AR = arm-none-eabi-ar
+RANLIB = arm-none-eabi-ranlib
+
+PLATFORM=stm32l1xx
+
+INC_CORE_SUPPORT=../inc/core_support
+SRC_CORE_SUPPORT=../inc/core_support
+INC_DEVICE_SUPPORT=../inc/device_support
+INC_PLATFORM=../inc/$(PLATFORM)
+SRC_PLATFORM=../src/$(PLATFORM)
+
+CFLAGS = -Wall -O2 -mlittle-endian -mthumb
+CFLAGS += -mcpu=cortex-m3 -ffreestanding -nostdlib -nostdinc
+CFLAGS += -I$(INC_PLATFORM) -I$(INC_DEVICE_SUPPORT) -I$(INC_CORE_SUPPORT) -I../inc/base
+
+SRCS=$(wildcard $(SRC_PLATFORM)/*.c)
+SRCS+=$(SRC_CORE_SUPPORT)/core_cm3.c
+
+OBJS = $(SRCS:.c=.o)
+
+all: $(LIB)
+
+$(LIB): $(OBJS)
+	$(AR) -r $(LIB) $(OBJS)
+	$(RANLIB) $(LIB)
+
+%.o : %.c
+	$(CC) $(CFLAGS) -c -o $@ $^
+
+clean:
+	-rm -f $(OBJS)
+	-rm -f $(LIB)
+
+.PHONY: all clean

example/libstm32l_discovery/build/Makefile

@@ -1,51 +0,0 @@
-LIB = libstm32l_discovery.a
-
-CC = arm-none-eabi-gcc
-AR = arm-none-eabi-ar
-RANLIB = arm-none-eabi-ranlib
-
-CFLAGS = -Wall -O2 -mlittle-endian -mthumb
-CFLAGS += -mcpu=cortex-m3 -ffreestanding -nostdlib -nostdinc
-CFLAGS += -I../inc -I../inc/device_support -I../inc/core_support -I../inc/base
-
-SRCS = \
-../src/misc.c \
-../src/stm32l1xx_adc.c \
-../src/stm32l1xx_comp.c \
-../src/stm32l1xx_crc.c \
-../src/stm32l1xx_dac.c \
-../src/stm32l1xx_dbgmcu.c \
-../src/stm32l1xx_dma.c \
-../src/stm32l1xx_exti.c \
-../src/stm32l1xx_flash.c \
-../src/stm32l1xx_flash_ramfunc.c \
-../src/stm32l1xx_gpio.c \
-../src/stm32l1xx_i2c.c \
-../src/stm32l1xx_iwdg.c \
-../src/stm32l1xx_lcd.c \
-../src/stm32l1xx_pwr.c \
-../src/stm32l1xx_rcc.c \
-../src/stm32l1xx_rtc.c \
-../src/stm32l1xx_spi.c \
-../src/stm32l1xx_syscfg.c \
-../src/stm32l1xx_tim.c \
-../src/stm32l1xx_usart.c \
-../src/stm32l1xx_wwdg.c \
-../inc/core_support/core_cm3.c
-
-OBJS = $(SRCS:.c=.o)
-
-all: $(LIB)
-
-$(LIB): $(OBJS)
-	$(AR) -r $(LIB) $(OBJS)
-	$(RANLIB) $(LIB)
-
-%.o : %.c
-	$(CC) $(CFLAGS) -c -o $@ $^
-
-clean:
-	-rm -f $(OBJS)
-	-rm -f $(LIB)
-
-.PHONY: all clean