motorolaMagicFromDbc(17, 10)

only:we have a problem?

unit_tests/tests/lua/test_lua_dbc.cpp

@@ -0,0 +1,38 @@
+#include "pch.h"
+#include "rusefi_lua.h"
+#include "lua_lib.h"
+
+static int motorolaMagicFromDbc(int b, int length) {
+    // https://github.com/ebroecker/canmatrix/wiki/signal-Byteorder
+    // convert from lsb0 bit numbering to msb0 bit numbering (or msb0 to lsb0)
+    b = b - (b % 8) + 7 - (b % 8);
+    // convert from lsbit of signal data to msbit of signal data, when bit numbering is msb0
+    b = b + length - 1;
+    // convert from msbit of signal data to lsbit of signal data, when bit numbering is msb0
+    b = b - (b % 8) + 7 - (b % 8);
+    return b;
+}
+
+TEST(dbcMotorola, testFromDbc) {
+    ASSERT_EQ(24, motorolaMagicFromDbc(27, 4));
+    ASSERT_EQ(24, motorolaMagicFromDbc(30, 7));
+    ASSERT_EQ(24, motorolaMagicFromDbc(31, 8));
+    ASSERT_EQ(24, motorolaMagicFromDbc(17, 10));
+
+    ASSERT_EQ(24, motorolaMagicFromDbc(17, 10));
+}
+
+TEST(dbcMotorola, testFromIntelIntoMotorolaDbc) {
+	// todo?!
+}
+
+TEST(dbcMotorola, accessRange) {
+  uint8_t data[] = { 0x00, 0x00, 0x03, 0xFF, 0x00, 0x00, 0x00, 0x00};
+
+  EXPECT_NEAR_M3(getBitRangeMsb(data, motorolaMagicFromDbc(17, 10), 10), 0x03FF);
+
+  EXPECT_NEAR_M3(getBitRangeLsb(data, 16, 2), 3);
+  EXPECT_NEAR_M3(getBitRangeLsb(data, 24, 8), 0xFF);
+
+
+}

unit_tests/tests/tests.mk

@@ -71,6 +71,7 @@ TESTS_SRC_CPP = \
 	tests/shift_torque_reduction/test_shift_torque_reduction_angle_advance.cpp \
 	tests/test_fft.cpp \
 	tests/lua/test_lua_basic.cpp \
+  tests/lua/test_lua_dbc.cpp \
 	tests/lua/test_lookup.cpp \
 	tests/lua/test_lua_e38.cpp \
 	tests/lua/test_lua_canam.cpp \