Allowed custom battery scaling on IO

src/drivers/px4io/px4io.cpp

@@ -896,8 +896,21 @@ PX4IO::task_main()
 
 				/* re-upload RC input config as it may have changed */
 				io_set_rc_config();
-			}
-		}
+
+				/* re-set the battery scaling */
+				int32_t voltage_scaling_val;
+				param_t voltage_scaling_param;
+
+				/* see if bind parameter has been set, and reset it to -1 */
+				param_get(voltage_scaling_param = param_find("BAT_V_SCALE_IO"), &voltage_scaling_val);
+
+				/* send channel config to IO */
+				uint16_t scaling = voltage_scaling_val;
+				int pret = io_reg_set(PX4IO_PAGE_SETUP, PX4IO_P_SETUP_VBATT_SCALE, &scaling, 1);
+
+				if (pret != OK) {
+					log("voltage scaling upload failed");
+				}
 
 		perf_end(_perf_update);
 	}

src/modules/sensors/sensor_params.c

@@ -195,6 +195,7 @@ PARAM_DEFINE_INT32(RC_RL1_DSM_VCC, 0); /* Relay 1 controls DSM VCC */
 #endif
 PARAM_DEFINE_INT32(RC_DSM_BIND, -1); /* -1 = Idle, 0 = Start DSM2 bind, 1 = Start DSMX bind */
 
+PARAM_DEFINE_INT32(BAT_V_SCALE_IO, 10000);
 #ifdef CONFIG_ARCH_BOARD_PX4FMU_V2
 PARAM_DEFINE_FLOAT(BAT_V_SCALING, 0.0082f);
 #else