Improve Korad IDN

Author: Martin.JM

src/hardware/korad-kaxxxxp/api.c

@@ -281,13 +281,17 @@ static GSList *scan(struct sr_dev_driver *di, GSList *options)
 	sr_dbg("Want max %zu bytes.", len);
 
 	/*
-	 * There is a quirk rolled into here:
-	 *  - The KORAD_QUIRK_NEWLINE needs a `\n`
-	 * If there's more at the end they still function perfectly fine.
-	 * But the normal ones need an `*IDN?` without anything at the end.
-	 * So this sends a combination that satisfies these constraints.
+	 * For the identification we send two messages due to the newline quirk
+	 * The first works on devices that require no newline to be there
+	 * The second adds support for devices that require the newline to be there
+	 * The timeout makes sure the former devices handle the cmd first
 	 */
-	ret = korad_kaxxxxp_send_cmd(serial, "*IDN?\n*IDN?", false);
+	ret = korad_kaxxxxp_send_cmd(serial, "*IDN?", false);
+	if (ret < 0)
+		return NULL;
+
+	g_usleep(100000);
+	ret = korad_kaxxxxp_send_cmd(serial, "\n", false);
 	if (ret < 0)
 		return NULL;