Make GIT_REVISION value available within code.

Addresses issue #59.
No idea what it'll do if the commit is also tagged as a release...

firmware/Makefile

@@ -35,7 +35,7 @@ MAKE_SPI_IMAGE=tools/make_spi_image.py
 DFU_HACKRF=hackrf_one_usb_ram.dfu
 LICENSE=../LICENSE
 
-REVISION=$(shell git log -n 1 --format=%h)
+GIT_REVISION=$(shell git log -n 1 --format=%h)
 
 CP=arm-none-eabi-objcopy
 
@@ -66,13 +66,13 @@ $(TARGET_APPLICATION).bin: $(TARGET_APPLICATION).elf
 	$(CP) -O binary $(TARGET_APPLICATION).elf $(TARGET_APPLICATION).bin
 
 $(TARGET_BASEBAND).elf: always_check
-	@$(MAKE) -s -C $(PATH_BASEBAND)
+	@$(MAKE) -s -e GIT_REVISION=$(GIT_REVISION) -C $(PATH_BASEBAND)
 
 $(TARGET_APPLICATION).elf: always_check
-	@$(MAKE) -s -C $(PATH_APPLICATION)
+	@$(MAKE) -s -e GIT_REVISION=$(GIT_REVISION) -C $(PATH_APPLICATION)
 
 $(TARGET_BOOTSTRAP).elf: always_check
-	@$(MAKE) -s -C $(PATH_BOOTSTRAP)
+	@$(MAKE) -s -e GIT_REVISION=$(GIT_REVISION) -C $(PATH_BOOTSTRAP)
 
 clean:
 	rm -f $(TARGET).bin

firmware/application/Makefile

@@ -254,7 +254,8 @@ CPPWARN = -Wall -Wextra
 # TODO: Switch -DCRT0_INIT_DATA depending on load from RAM or SPIFI?
 # NOTE: _RANDOM_TCC to kill a GCC 4.9.3 error with std::max argument types
 DDEFS = -DLPC43XX -DLPC43XX_M0 -D__NEWLIB__ -DHACKRF_ONE \
-        -DTOOLCHAIN_GCC -DTOOLCHAIN_GCC_ARM -D_RANDOM_TCC=0
+        -DTOOLCHAIN_GCC -DTOOLCHAIN_GCC_ARM -D_RANDOM_TCC=0 \
+        -DGIT_REVISION=\"$(GIT_REVISION)\"
 
 # List all default ASM defines here, like -D_DEBUG=1
 DADEFS =

firmware/application/ui_setup.hpp

@@ -190,7 +190,7 @@ private:
 
 	Text text_firmware {
 		{ 0, 128, 240, 16 },
-		"Firmware Version    git-??????",
+		"Git Commit Hash        " GIT_REVISION,
 	};
 
 	Text text_cpld_hackrf {

firmware/baseband/Makefile

@@ -223,7 +223,8 @@ CPPWARN = -Wall -Wextra
 # TODO: Switch -DCRT0_INIT_DATA depending on load from RAM or SPIFI?
 # NOTE: _RANDOM_TCC to kill a GCC 4.9.3 error with std::max argument types
 DDEFS = -DLPC43XX -DLPC43XX_M4 -D__NEWLIB__ -DHACKRF_ONE \
-        -DTOOLCHAIN_GCC -DTOOLCHAIN_GCC_ARM -D_RANDOM_TCC=0
+        -DTOOLCHAIN_GCC -DTOOLCHAIN_GCC_ARM -D_RANDOM_TCC=0 \
+        -DGIT_REVISION=\"$(GIT_REVISION)\"
 
 # List all default ASM defines here, like -D_DEBUG=1
 DADEFS =

firmware/bootstrap/Makefile

@@ -39,6 +39,7 @@ COPT=-std=gnu99 \
 	 -Wall -Wextra -Wstrict-prototypes \
 	 $(CPUFLAGS) \
 	 -DLPC43XX -DLPC43XX_M4 \
+	 -DGIT_REVISION=\"$(GIT_REVISION)\" \
 	 -Os \
 	 -ffunction-sections \
 	 -fdata-sections \