only:kia CAN

firmware/controllers/lua/lua_lib.h

@@ -123,4 +123,15 @@ function setBitRange(data, totalBitIndex, bitWidth, value) \
 end \
 "
 
+#define HYUNDAI_SUM_NIBBLES "\
+function hyuindaiSumNibbles(seed) \
+  local sum = seed \
+  for i = 1, 7, 1 \
+  do \
+    b = data[i] \
+    sum =  sum +  (b % 16) + math.floor(b / 16) \
+  end \
+  return (16 - sum) % 16 \
+end \
+"
 

unit_tests/tests/lua/test_lua_kia.cpp

@@ -29,3 +29,13 @@ rpm = 990
                                              		)"
 			).value_or(0), 0);
 }
+
+TEST(LuaKia, calcSumOfNibbles) {
+#define real81Packet "\ndata = { 0x40, 0x85, 0x5F, 0x00, 0x00, 0x00, 0x00, 0xED}\n "
+	const char* script = HYUNDAI_SUM_NIBBLES	real81Packet	R"(
+function testFunc()
+  return hyuindaiSumNibbles(0xD)
+end
+    	)";
+	EXPECT_NEAR_M3(testLuaReturnsNumberOrNil(script).value_or(0), 0xE);
+}