CF/BF - add support for reading all voltage and current meters via MSP.

Refactored current meter API and state, now it's more closely aligned
with the the voltage meter API.

src/main/sensors/current_ids.h

@@ -0,0 +1,69 @@
+/*
+ * This file is part of Cleanflight.
+ *
+ * Cleanflight is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Cleanflight is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+//
+// fixed ids, current can be measured at many different places, these identifiers are the ones we support or would consider supporting.
+//
+
+typedef enum {
+    CURRENT_METER_ID_NONE = 0,
+
+    CURRENT_METER_ID_VBAT_1 = 10,       // 10-19 for battery meters
+    CURRENT_METER_ID_VBAT_2,
+    //..
+    CURRENT_METER_ID_VBAT_10 = 19,
+
+    CURRENT_METER_ID_5V_1 = 20,         // 20-29 for 5V meters
+    CURRENT_METER_ID_5V_2,
+    //..
+    CURRENT_METER_ID_5V_10 = 29,
+
+    CURRENT_METER_ID_9V_1 = 30,         // 30-39 for 9V meters
+    CURRENT_METER_ID_9V_2,
+    //..
+    CURRENT_METER_ID_9V_10 = 39,
+
+    CURRENT_METER_ID_12V_1 = 40,        // 40-49 for 12V meters
+    CURRENT_METER_ID_12V_2,
+    //..
+    CURRENT_METER_ID_12V_10 = 49,
+
+    CURRENT_METER_ID_ESC_COMBINED_1 = 50, // 50-59 for ESC combined (it's doubtful an FC would ever expose 51-59 however)
+    // ...
+    CURRENT_METER_ID_ESC_COMBINED_10 = 59,
+
+    CURRENT_METER_ID_ESC_MOTOR_1 = 60,  // 60-79 for ESC motors (20 motors)
+    CURRENT_METER_ID_ESC_MOTOR_2,
+    CURRENT_METER_ID_ESC_MOTOR_3,
+    CURRENT_METER_ID_ESC_MOTOR_4,
+    CURRENT_METER_ID_ESC_MOTOR_5,
+    CURRENT_METER_ID_ESC_MOTOR_6,
+    CURRENT_METER_ID_ESC_MOTOR_7,
+    CURRENT_METER_ID_ESC_MOTOR_8,
+    CURRENT_METER_ID_ESC_MOTOR_9,
+    CURRENT_METER_ID_ESC_MOTOR_10,
+    CURRENT_METER_ID_ESC_MOTOR_11,
+    CURRENT_METER_ID_ESC_MOTOR_12,
+    //...
+    CURRENT_METER_ID_ESC_MOTOR_20 = 79,
+
+    CURRENT_METER_ID_VIRTUAL_1 = 80,       // 80-89 for virtual meters
+    CURRENT_METER_ID_VIRTUAL_2,
+
+} currentMeterId_e;