diff --git a/src/main/fc/config.c b/src/main/fc/config.c
index eaa40a7ed6..d597fc128a 100755
--- a/src/main/fc/config.c
+++ b/src/main/fc/config.c
@@ -407,6 +407,7 @@ void resetFlight3DConfig(flight3DConfig_t *flight3DConfig)
 void resetTelemetryConfig(telemetryConfig_t *telemetryConfig)
 {
     telemetryConfig->telemetry_inversion = 1;
+    telemetryConfig->sportHalfDuplex = 1;
     telemetryConfig->telemetry_switch = 0;
     telemetryConfig->gpsNoFixLatitude = 0;
     telemetryConfig->gpsNoFixLongitude = 0;
diff --git a/src/main/io/serial_cli.c b/src/main/io/serial_cli.c
index 43c45c1864..5783a3a170 100755
--- a/src/main/io/serial_cli.c
+++ b/src/main/io/serial_cli.c
@@ -787,6 +787,7 @@ const clivalue_t valueTable[] = {
 #ifdef TELEMETRY
     { "telemetry_switch",           VAR_UINT8  | MASTER_VALUE | MODE_LOOKUP,  &telemetryConfig()->telemetry_switch, .config.lookup = { TABLE_OFF_ON } },
     { "telemetry_inversion",        VAR_UINT8  | MASTER_VALUE | MODE_LOOKUP,  &telemetryConfig()->telemetry_inversion, .config.lookup = { TABLE_OFF_ON } },
+    { "sport_halfduplex",           VAR_UINT8  | MASTER_VALUE | MODE_LOOKUP,  &telemetryConfig()->sportHalfDuplex, .config.lookup = { TABLE_OFF_ON } },
     { "frsky_default_lattitude",    VAR_FLOAT  | MASTER_VALUE,  &telemetryConfig()->gpsNoFixLatitude, .config.minmax = { -90.0,  90.0 } },
     { "frsky_default_longitude",    VAR_FLOAT  | MASTER_VALUE,  &telemetryConfig()->gpsNoFixLongitude, .config.minmax = { -180.0,  180.0 } },
     { "frsky_coordinates_format",   VAR_UINT8  | MASTER_VALUE,  &telemetryConfig()->frsky_coordinate_format, .config.minmax = { 0,  FRSKY_FORMAT_NMEA } },
diff --git a/src/main/main.c b/src/main/main.c
index 90aaa03306..6412f8d6d5 100644
--- a/src/main/main.c
+++ b/src/main/main.c
@@ -124,6 +124,10 @@
 #include "build/build_config.h"
 #include "build/debug.h"
 
+#ifdef TARGET_PREINIT
+void targetPreInit(void);
+#endif
+
 #ifdef TARGET_BUS_INIT
 void targetBusInit(void);
 #endif
@@ -180,7 +184,11 @@ void init(void)
     // Latch active features to be used for feature() in the remainder of init().
     latchActiveFeatures();
 
-    ledInit(&masterConfig.statusLedConfig);
+#ifdef TARGET_PREINIT
+    targetPreInit();
+#endif
+    
+    ledInit(statusLedConfig());
     LED2_ON;
 
 #ifdef USE_EXTI
@@ -268,9 +276,9 @@ void init(void)
 #endif
 
 #ifdef USE_QUAD_MIXER_ONLY
-    motorInit(&masterConfig.motorConfig, idlePulse, QUAD_MOTOR_COUNT);
+    motorInit(motorConfig(), idlePulse, QUAD_MOTOR_COUNT);
 #else
-    motorInit(&masterConfig.motorConfig, idlePulse, motorCount);
+    motorInit(motorConfig(), idlePulse, motorCount);
 #endif
 
 #ifdef USE_SERVOS
@@ -291,7 +299,7 @@ void init(void)
     systemState |= SYSTEM_STATE_MOTORS_READY;
 
 #ifdef BEEPER
-    beeperInit(&masterConfig.beeperConfig);
+    beeperInit(beeperConfig());
 #endif
 /* temp until PGs are implemented. */
 #ifdef INVERTER
@@ -350,10 +358,10 @@ void init(void)
     adcConfig()->vbat.enabled = feature(FEATURE_VBAT);
     adcConfig()->currentMeter.enabled = feature(FEATURE_CURRENT_METER);
     adcConfig()->rssi.enabled = feature(FEATURE_RSSI_ADC);
-    adcInit(&masterConfig.adcConfig);
+    adcInit(adcConfig());
 #endif
 
-    initBoardAlignment(&masterConfig.boardAlignment);
+    initBoardAlignment(boardAlignment());
 
 #ifdef CMS
     cmsInit();
@@ -361,7 +369,7 @@ void init(void)
 
 #ifdef USE_DASHBOARD
     if (feature(FEATURE_DASHBOARD)) {
-        dashboardInit(&masterConfig.rxConfig);
+        dashboardInit(rxConfig());
     }
 #endif
 
@@ -428,12 +436,12 @@ void init(void)
 #endif
 
 #ifdef USE_CLI
-    cliInit(&masterConfig.serialConfig);
+    cliInit(serialConfig());
 #endif
 
-    failsafeInit(&masterConfig.rxConfig, flight3DConfig()->deadband3d_throttle);
+    failsafeInit(rxConfig(), flight3DConfig()->deadband3d_throttle);
 
-    rxInit(&masterConfig.rxConfig, masterConfig.modeActivationConditions);
+    rxInit(rxConfig(), masterConfig.modeActivationConditions);
 
 #ifdef GPS
     if (feature(FEATURE_GPS)) {
@@ -449,7 +457,7 @@ void init(void)
 #endif
 
 #ifdef LED_STRIP
-    ledStripInit(&masterConfig.ledStripConfig);
+    ledStripInit(ledStripConfig());
 
     if (feature(FEATURE_LED_STRIP)) {
         ledStripEnable();
diff --git a/src/main/target/BLUEJAYF4/initialisation.c b/src/main/target/BLUEJAYF4/initialisation.c
new file mode 100644
index 0000000000..a11301baa0
--- /dev/null
+++ b/src/main/target/BLUEJAYF4/initialisation.c
@@ -0,0 +1,48 @@
+/*
+ * 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/>.
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "platform.h"
+#include "drivers/bus_i2c.h"
+#include "drivers/bus_spi.h"
+#include "hardware_revision.h"
+#include "config/config_master.h"
+#include "drivers/io.h"
+#include "config/feature.h"
+
+void targetPreInit(void)
+{
+    /* enable the built in inverter if telemetry is setup for the UART1 */
+    if (serialConfig()->portConfigs[SERIAL_PORT_USART1].functionMask & FUNCTION_TELEMETRY_SMARTPORT && 
+        telemetryConfig()->telemetry_inversion &&
+        feature(FEATURE_TELEMETRY)) {
+        IO_t io = IOGetByTag(IO_TAG(UART1_INVERTER));
+        IOInit(io, OWNER_INVERTER, 1);
+        IOConfigGPIO(io, IOCFG_OUT_PP);
+        IOHi(io);
+    }
+    
+    /* ensure the CS pin for the flash is pulled hi so any SD card initialisation does not impact the chip */
+    if (hardwareRevision == BJF4_REV3) {
+        IO_t io = IOGetByTag(IO_TAG(M25P16_CS_PIN));
+        IOConfigGPIO(io, IOCFG_OUT_PP);
+        IOHi(io);
+    }    
+}
+
diff --git a/src/main/target/BLUEJAYF4/target.h b/src/main/target/BLUEJAYF4/target.h
index 750ebf7ab5..17a1d389a2 100644
--- a/src/main/target/BLUEJAYF4/target.h
+++ b/src/main/target/BLUEJAYF4/target.h
@@ -19,6 +19,7 @@
 #define TARGET_BOARD_IDENTIFIER "BJF4"
 #define TARGET_CONFIG
 #define TARGET_VALIDATECONFIG
+#define TARGET_PREINIT
 
 #define CONFIG_START_FLASH_ADDRESS (0x08080000) //0x08080000 to 0x080A0000 (FLASH_Sector_8)
 
@@ -40,6 +41,8 @@
 #define INVERTER                PB15
 #define INVERTER_USART          USART6
 
+#define UART1_INVERTER          PC9
+
 // MPU6500 interrupt
 #define USE_EXTI
 #define MPU_INT_EXTI            PC5
diff --git a/src/main/telemetry/smartport.c b/src/main/telemetry/smartport.c
index 4d1d19718a..d33ebb09a7 100644
--- a/src/main/telemetry/smartport.c
+++ b/src/main/telemetry/smartport.c
@@ -328,12 +328,14 @@ void configureSmartPortTelemetryPort(void)
         return;
     }
 
-    portOptions = SERIAL_BIDIR;
-
+    if (telemetryConfig->sportHalfDuplex) {
+        portOptions = SERIAL_BIDIR;
+    }
+    
     if (telemetryConfig->telemetry_inversion) {
         portOptions |= SERIAL_INVERTED;
     }
-
+    
     smartPortSerialPort = openSerialPort(portConfig->identifier, FUNCTION_TELEMETRY_SMARTPORT, NULL, SMARTPORT_BAUD, SMARTPORT_UART_MODE, portOptions);
 
     if (!smartPortSerialPort) {
diff --git a/src/main/telemetry/telemetry.h b/src/main/telemetry/telemetry.h
index f656578b95..91b2ff004a 100644
--- a/src/main/telemetry/telemetry.h
+++ b/src/main/telemetry/telemetry.h
@@ -37,6 +37,7 @@ typedef enum {
 typedef struct telemetryConfig_s {
     uint8_t telemetry_switch;               // Use aux channel to change serial output & baudrate( MSP / Telemetry ). It disables automatic switching to Telemetry when armed.
     uint8_t telemetry_inversion;            // also shared with smartport inversion
+    uint8_t sportHalfDuplex;
     float gpsNoFixLatitude;
     float gpsNoFixLongitude;
     frskyGpsCoordFormat_e frsky_coordinate_format;