diff --git a/.gitignore b/.gitignore
index a1f4427..fe76084 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,7 @@ TAGS
 iar/Debug
 iar/Release
 iar/settings
+iar/githash.h
 *.dep
 *.ewd
 *.ewt
\ No newline at end of file
diff --git a/iar/NanoVNA.ewp b/iar/NanoVNA.ewp
index 853e9f2..86538e6 100644
--- a/iar/NanoVNA.ewp
+++ b/iar/NanoVNA.ewp
@@ -217,7 +217,6 @@
                     <name>CCDefines</name>
                     <state>ARM_MATH_CM0</state>
                     <state>M_PI=3.14159265358979323846</state>
-                    <state>VERSION="test"</state>
                 </option>
                 <option>
                     <name>CCPreprocFile</name>
@@ -334,7 +333,7 @@
                 </option>
                 <option>
                     <name>PreInclude</name>
-                    <state></state>
+                    <state>$PROJ_DIR$\githash.h</state>
                 </option>
                 <option>
                     <name>CompilerMisraOverride</name>
@@ -1264,7 +1263,6 @@
                     <state>NDEBUG</state>
                     <state>ARM_MATH_CM0</state>
                     <state>M_PI=3.14159265358979323846</state>
-                    <state>VERSION="test"</state>
                 </option>
                 <option>
                     <name>CCPreprocFile</name>
@@ -1381,7 +1379,7 @@
                 </option>
                 <option>
                     <name>PreInclude</name>
-                    <state></state>
+                    <state>$PROJ_DIR$\githash.h</state>
                 </option>
                 <option>
                     <name>CompilerMisraOverride</name>
@@ -1437,7 +1435,7 @@
                 <option>
                     <name>CCOptStrategy</name>
                     <version>0</version>
-                    <state>0</state>
+                    <state>2</state>
                 </option>
                 <option>
                     <name>CCOptLevelSlave</name>
@@ -1500,7 +1498,7 @@
                 <option>
                     <name>CCOptStrategySlave</name>
                     <version>0</version>
-                    <state>0</state>
+                    <state>2</state>
                 </option>
                 <option>
                     <name>CCGuardCalls</name>
@@ -2344,6 +2342,9 @@
             <file>
                 <name>$PROJ_DIR$\..\fft.h</name>
             </file>
+            <file>
+                <name>$PROJ_DIR$\githash.h</name>
+            </file>
             <file>
                 <name>$PROJ_DIR$\..\halconf.h</name>
             </file>
diff --git a/iar/githash_get.bat b/iar/githash_get.bat
new file mode 100644
index 0000000..369e7a8
--- /dev/null
+++ b/iar/githash_get.bat
@@ -0,0 +1,8 @@
+git rev-parse --short HEAD > githash.h
+set /p GITHASH=<githash.h
+
+echo #ifdef NDEBUG>githash.h
+echo     #define VERSION "%GITHASH%-release">>githash.h
+echo #else>>githash.h
+echo     #define VERSION "%GITHASH%-debug">>githash.h
+echo #endif>>githash.h