build: Generate gps-watch-bootloader-intermediate.frm.

[gps-watch.git] / SConstruct

diff --git a/SConstruct b/SConstruct
index 4b5a1bc6b3d3d546d9c351ce83be39abc9dda1d9..6823b768066b8f95c4ac6a0947ec3b5ccd720e63 100644 (file)
--- a/SConstruct
+++ b/SConstruct
@@ -11,6 +11,7 @@ if ARGUMENTS.get('V', '0') != '1':
     root_env['ARCOMSTR'] = '    AR $TARGET'
     root_env['RANLIBCOMSTR'] = '    RANLIB $TARGET'
     root_env['OBJCOPYCOMSTR'] = '    OBJCOPY $TARGET'
+    root_env['FRMCOMSTR'] = '    FRM $TARGET'
 
 # Make colored output of e.g. gcc work.
 root_env['ENV']['TERM'] = os.environ.get('TERM')
@@ -32,6 +33,26 @@ root_env.Append(BUILDERS = { 'Objcopy': Builder(
     suffix='.bin',
     src_suffix='.elf')})
 
+def xor8(buf):
+    import functools
+
+    return functools.reduce(lambda x, y: (x & 0xff) ^ (y & 0xff), buf)
+
+def build_frm(target, source, env):
+    with open(str(source[0]), 'rb') as f_in:
+        buf = f_in.read()
+
+        with open(str(target[0]), 'wb') as f_out:
+            f_out.write(buf)
+            f_out.write(bytearray([xor8(buf)]))
+
+    return 0
+
+root_env.Append(BUILDERS = { 'Frm': Builder(
+    action=Action(build_frm, '$FRMCOMSTR'),
+    suffix='.frm',
+    src_suffix='.bin')})
+
 env = root_env.Clone()
 env['variant_dir'] = 'build-target'
 env['LIBPATH'] = env['variant_dir']