Add version to firmware image

Makefile

@@ -5,11 +5,17 @@ $(info $(shell cd src/board && echo */*))
 $(error BOARD not set)
 endif
 
+# Calculate version
+DATE=$(shell git show --format="%cd" --date="format:%Y-%m-%d" --no-patch)
+REV=$(shell git describe --always --dirty)
+VERSION=$(DATE)_$(REV)
+
 # Set build directory
-BUILD=build/$(BOARD)
+BUILD=build/$(BOARD)/$(VERSION)
 
 # Default target - build the board's EC firmware
 all: $(BUILD)/ec.rom
+	$(info Built '$(VERSION)' for '$(BOARD)')
 
 # Target to remove build artifacts
 clean:
@@ -19,7 +25,7 @@ clean:
 COMMON_DIR=src/common
 SRC=$(wildcard $(COMMON_DIR)/*.c)
 INCLUDE=$(wildcard $(COMMON_DIR)/include/common/*.h) $(COMMON_DIR)/common.mk
-CFLAGS=-I$(COMMON_DIR)/include
+CFLAGS=-I$(COMMON_DIR)/include -D__VERSION__=$(VERSION)
 include $(COMMON_DIR)/common.mk
 
 # Include the board's source

src/board/system76/darp5/main.c

@@ -19,7 +19,7 @@
 #include <board/smbus.h>
 #include <common/debug.h>
 #include <common/macro.h>
-
+#include <common/version.h>
 
 void external_0(void) __interrupt(0) {}
 // timer_0 is in time.c
@@ -91,7 +91,7 @@ void main(void) {
     gpio_set(&SMI_N, true);
     gpio_set(&SWI_N, true);
 
-    INFO("Hello from System76 EC for %s!\n", xstr(__BOARD__));
+    INFO("System76 EC board '%s', version '%s'\n", board(), version());
 
     for(main_cycle = 0; ; main_cycle++) {
         // Handle power states

src/board/system76/galp3-c/main.c

@@ -20,7 +20,7 @@
 #include <board/smbus.h>
 #include <common/debug.h>
 #include <common/macro.h>
-
+#include <common/version.h>
 
 void external_0(void) __interrupt(0) {}
 // timer_0 is in time.c
@@ -93,7 +93,7 @@ void main(void) {
     gpio_set(&SMI_N, true);
     gpio_set(&SWI_N, true);
 
-    INFO("Hello from System76 EC for %s!\n", xstr(__BOARD__));
+    INFO("System76 EC board '%s', version '%s'\n", board(), version());
 
     for(main_cycle = 0; ; main_cycle++) {
         // Handle power states

src/board/system76/lemp9/main.c

@@ -21,7 +21,7 @@
 #include <board/tcpm.h>
 #include <common/debug.h>
 #include <common/macro.h>
-
+#include <common/version.h>
 
 void external_0(void) __interrupt(0) {}
 // timer_0 is in time.c
@@ -95,7 +95,7 @@ void main(void) {
     gpio_set(&SMI_N, true);
     gpio_set(&SWI_N, true);
 
-    INFO("Hello from System76 EC for %s!\n", xstr(__BOARD__));
+    INFO("System76 EC board '%s', version '%s'\n", board(), version());
 
     for(main_cycle = 0; ; main_cycle++) {
         // Handle power states

src/common/include/common/version.h

@@ -0,0 +1,7 @@
+#ifndef _COMMON_VERSION_H
+#define _COMMON_VERSION_H
+
+const char * board();
+const char * version();
+
+#endif // _COMMON_VERSION_H

src/common/version.c

@@ -0,0 +1,17 @@
+#include <common/macro.h>
+
+static const char __code BOARD[] =
+    "76EC_BOARD="
+    xstr(__BOARD__);
+
+static const char __code VERSION[] =
+    "76EC_VERSION="
+    xstr(__VERSION__);
+
+const char * board() {
+    return &BOARD[11];
+}
+
+const char * version() {
+    return &VERSION[13];
+}