flash_loader: makefile simplification

flashloaders/Makefile

@@ -1,10 +1,7 @@
-# Note that according to the original GPLed code, compiling is noted to be
-# as simple as gcc -c, this fails with my tests where this will lead to a wrong 
-# address read by the program.
-# This makefile will save your time from dealing with compile errors
-# Adjust CC if needed
+# The flash loader code cannot be compiled by the system gcc. This 
+# makefile use arm-none-eabi-gcc for this purpose
 
-CROSS_COMPILE ?= /opt/gcc-arm-none-eabi-6-2017-q2-update/bin/arm-none-eabi-
+CROSS_COMPILE ?= arm-none-eabi-
 
 CC = $(CROSS_COMPILE)gcc
 OBJCOPY = $(CROSS_COMPILE)objcopy
@@ -12,52 +9,30 @@ OBJCOPY = $(CROSS_COMPILE)objcopy
 XXD = xxd
 XXDFLAGS = -i -c 4 
 
-CFLAGS_THUMB1 = -mcpu=Cortex-M0 -Tlinker.ld -ffreestanding -nostdlib
-CFLAGS_THUMB2 = -mcpu=Cortex-M3 -Tlinker.ld -ffreestanding -nostdlib
+CFLAGS_ARMV6_M = -mcpu=Cortex-M0 -Tlinker.ld -ffreestanding -nostdlib
+CFLAGS_ARMV7_M = -mcpu=Cortex-M3 -Tlinker.ld -ffreestanding -nostdlib
 
 all: stm32vl.h stm32f0.h stm32lx.h stm32f4.h stm32f4lv.h stm32l4.h stm32f7.h stm32f7lv.h
+	
 
-stm32f0.h: stm32f0.s
-	$(CC) stm32f0.s $(CFLAGS_THUMB1) -o stm32f0.o
-	$(OBJCOPY) -O binary stm32f0.o stm32f0.bin
-	$(XXD) $(XXDFLAGS) stm32f0.bin stm32f0.h
+%.h: %.bin
+	$(XXD) $(XXDFLAGS) $< $@
 
-stm32vl.h: stm32f0.s
-	$(CC) stm32f0.s $(CFLAGS_THUMB2) -o stm32vl.o
-	$(OBJCOPY) -O binary stm32vl.o stm32vl.bin
-	$(XXD) $(XXDFLAGS) stm32vl.bin stm32vl.h
+%.bin: %.o
+	$(OBJCOPY) -O binary $< $@
+	rm $<
 
-stm32lx.h: stm32lx.s
-	$(CC) stm32lx.s $(CFLAGS_THUMB2) -o stm32lx.o
-	$(OBJCOPY) -O binary stm32lx.o stm32lx.bin
-	$(XXD) $(XXDFLAGS) stm32lx.bin stm32lx.h
+# separate rule for STM32F0
+stm32f0.o: stm32f0.s
+	$(CC) stm32f0.s $(CFLAGS_ARMV6_M) -o stm32f0.o
 
-stm32f4.h: stm32f4.s
-	$(CC) stm32f4.s $(CFLAGS_THUMB2) -o stm32f4.o
-	$(OBJCOPY) -O binary stm32f4.o stm32f4.bin
-	$(XXD) $(XXDFLAGS) stm32f4.bin stm32f4.h
+# separate rule for STM32F1/F3
+stm32vl.o: stm32f0.s
+	$(CC) stm32f0.s $(CFLAGS_ARMV7_M) -o stm32vl.o
 
-stm32f4lv.h: stm32f4lv.s
-	$(CC) stm32f4lv.s $(CFLAGS_THUMB2) -o stm32f4lv.o
-	$(OBJCOPY) -O binary stm32f4lv.o stm32f4lv.bin
-	$(XXD) $(XXDFLAGS) stm32f4lv.bin stm32f4lv.h
-
-stm32l4.h: stm32l4.s
-	$(CC) stm32l4.s $(CFLAGS_THUMB2) -o stm32l4.o
-	$(OBJCOPY) -O binary stm32l4.o stm32l4.bin
-	$(XXD) $(XXDFLAGS) stm32l4.bin stm32l4.h
-
-stm32f7.h: stm32f7.s
-	$(CC) stm32f7.s $(CFLAGS_THUMB2) -o stm32f7.o
-	$(OBJCOPY) -O binary stm32f7.o stm32f7.bin
-	$(XXD) $(XXDFLAGS) stm32f7.bin stm32f7.h
-
-stm32f7lv.h: stm32f7lv.s
-	$(CC) stm32f7lv.s $(CFLAGS_THUMB2) -o stm32f7lv.o
-	$(OBJCOPY) -O binary stm32f7lv.o stm32f7lv.bin
-	$(XXD) $(XXDFLAGS) stm32f7lv.bin stm32f7lv.h
+# generic rule for all other ARMv7-M
+%.o: *.s
+	$(CC) $< $(CFLAGS_ARMV7_M) -o $@
 
 clean:
-	rm *.o
-	rm *.bin
-	rm *.h
+	rm -f *.h