lib/rc: Fix DSM2/DSMX guessing routine and DSM range checking (#18270)

* Add Orangerx test case

Co-authored-by: Chris Seto <chris.seto@bossanova.com>

src/lib/rc/dsm.h

@@ -50,7 +50,7 @@ __BEGIN_DECLS
 
 #define DSM_FRAME_SIZE		16		/**< DSM frame size in bytes */
 #define DSM_FRAME_CHANNELS	7		/**< Max supported DSM channels per frame */
-#define DSM_MAX_CHANNEL_COUNT   18  /**< Max channel count of any DSM RC */
+#define DSM_MAX_CHANNEL_COUNT   20  /**< Max channel count of any DSM RC */
 #define DSM_BUFFER_SIZE		(DSM_FRAME_SIZE + DSM_FRAME_SIZE / 2)
 
 

src/lib/rc/rc_tests/RCTest.cpp

@@ -36,6 +36,7 @@ private:
 	bool dsmTest10Ch();
 	bool dsmTest16Ch();
 	bool dsmTest22msDSMX16Ch();
+	bool dsmTestOrangeDsmx();
 	bool sbus2Test();
 	bool st24Test();
 	bool sumdTest();
@@ -48,6 +49,7 @@ bool RCTest::run_tests()
 	ut_run_test(dsmTest10Ch);
 	ut_run_test(dsmTest16Ch);
 	ut_run_test(dsmTest22msDSMX16Ch);
+	ut_run_test(dsmTestOrangeDsmx);
 	ut_run_test(sbus2Test);
 	ut_run_test(st24Test);
 	ut_run_test(sumdTest);
@@ -231,17 +233,22 @@ bool RCTest::ghstTest()
 
 bool RCTest::dsmTest10Ch()
 {
-	return dsmTest(TEST_DATA_PATH "dsm_x_data.txt", 10, 17, 1500);
+	return dsmTest(TEST_DATA_PATH "dsm_x_data.txt", 10, 2, 1500);
 }
 
 bool RCTest::dsmTest16Ch()
 {
-	return dsmTest(TEST_DATA_PATH "dsm_x_dx9_data.txt", 16, 6, 1500);
+	return dsmTest(TEST_DATA_PATH "dsm_x_dx9_data.txt", 16, 1, 1500);
 }
 
 bool RCTest::dsmTest22msDSMX16Ch()
 {
-	return dsmTest(TEST_DATA_PATH "dsm_x_dx9_px4_binding_data.txt", 16, 11, 1499);
+	return dsmTest(TEST_DATA_PATH "dsm_x_dx9_px4_binding_data.txt", 16, 1, 1499);
+}
+
+bool RCTest::dsmTestOrangeDsmx()
+{
+	return dsmTest(TEST_DATA_PATH "orangerx_dsmx_12.txt", 12, 1, 1499);
 }
 
 bool RCTest::dsmTest(const char *filepath, unsigned expected_chancount, unsigned expected_dropcount, unsigned chan0)