diff --git a/src/main/drivers/serial_uart.c b/src/main/drivers/serial_uart.c
index 19b5c0bb51..474ce65a41 100644
--- a/src/main/drivers/serial_uart.c
+++ b/src/main/drivers/serial_uart.c
@@ -52,18 +52,11 @@ static void usartConfigurePinInversion(uartPort_t *uartPort) {
 #ifdef STM32F303xC
     uint32_t inversionPins = 0;
 
-    // Inversion when using OPTION_BIDIR not supported yet.
-    if (uartPort->port.options & SERIAL_BIDIR) {
-        // Clear inversion on both Tx and Rx
-        inversionPins |= USART_InvPin_Tx | USART_InvPin_Rx;
-        inverted = false;
-    } else {
-        if (uartPort->port.mode & MODE_TX) {
-            inversionPins |= USART_InvPin_Tx;
-        }
-        if (uartPort->port.mode & MODE_RX) {
-            inversionPins |= USART_InvPin_Rx;
-        }
+    if (uartPort->port.mode & MODE_TX) {
+        inversionPins |= USART_InvPin_Tx;
+    }
+    if (uartPort->port.mode & MODE_RX) {
+        inversionPins |= USART_InvPin_Rx;
     }
 
     USART_InvPinCmd(uartPort->USARTx, inversionPins, inverted ? ENABLE : DISABLE);
@@ -93,6 +86,11 @@ static void uartReconfigure(uartPort_t *uartPort)
 
     usartConfigurePinInversion(uartPort);
 
+    if(uartPort->port.options & SERIAL_BIDIR)
+        USART_HalfDuplexCmd(uartPort->USARTx, ENABLE);
+    else
+        USART_HalfDuplexCmd(uartPort->USARTx, DISABLE);
+
     USART_Cmd(uartPort->USARTx, ENABLE);
 }
 
@@ -182,11 +180,6 @@ serialPort_t *uartOpen(USART_TypeDef *USARTx, serialReceiveCallbackPtr callback,
 
     USART_Cmd(s->USARTx, ENABLE);
 
-    if (options & SERIAL_BIDIR)
-        USART_HalfDuplexCmd(s->USARTx, ENABLE);
-    else
-        USART_HalfDuplexCmd(s->USARTx, DISABLE);
-
     return (serialPort_t *)s;
 }
 
diff --git a/src/main/drivers/serial_uart_stm32f30x.c b/src/main/drivers/serial_uart_stm32f30x.c
index fa16225616..c7d62d5f06 100644
--- a/src/main/drivers/serial_uart_stm32f30x.c
+++ b/src/main/drivers/serial_uart_stm32f30x.c
@@ -116,13 +116,15 @@ uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode, portOptions_t optio
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
-    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
+    GPIO_InitStructure.GPIO_PuPd = (options & SERIAL_INVERTED) ? GPIO_PuPd_DOWN : GPIO_PuPd_UP;
 
     if (options & SERIAL_BIDIR) {
         GPIO_InitStructure.GPIO_Pin = UART1_TX_PIN;
-        GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
+        GPIO_InitStructure.GPIO_OType = (options & SERIAL_INVERTED) ? GPIO_OType_PP : GPIO_OType_OD;
         GPIO_PinAFConfig(UART1_GPIO, UART1_TX_PINSOURCE, UART1_GPIO_AF);
         GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
+        if(!(options & SERIAL_INVERTED))
+            GPIO_SetBits(UART1_GPIO, UART1_TX_PIN);   // OpenDrain output should be inactive
     } else {
         if (mode & MODE_TX) {
             GPIO_InitStructure.GPIO_Pin = UART1_TX_PIN;
@@ -195,13 +197,15 @@ uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode, portOptions_t optio
     GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
-    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
+    GPIO_InitStructure.GPIO_PuPd  = (options & SERIAL_INVERTED) ? GPIO_PuPd_DOWN : GPIO_PuPd_UP;
 
     if (options & SERIAL_BIDIR) {
         GPIO_InitStructure.GPIO_Pin = UART2_TX_PIN;
-        GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
+        GPIO_InitStructure.GPIO_OType = (options & SERIAL_INVERTED) ? GPIO_OType_PP : GPIO_OType_OD;
         GPIO_PinAFConfig(UART2_GPIO, UART2_TX_PINSOURCE, UART2_GPIO_AF);
         GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
+        if(!(options & SERIAL_INVERTED))
+            GPIO_SetBits(UART2_GPIO, UART2_TX_PIN);   // OpenDrain output should be inactive
     } else {
         if (mode & MODE_TX) {
             GPIO_InitStructure.GPIO_Pin = UART2_TX_PIN;
@@ -276,13 +280,15 @@ uartPort_t *serialUSART3(uint32_t baudRate, portMode_t mode, portOptions_t optio
     GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
-    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
+    GPIO_InitStructure.GPIO_PuPd  = (options & SERIAL_INVERTED) ? GPIO_PuPd_DOWN : GPIO_PuPd_UP;
 
     if (options & SERIAL_BIDIR) {
         GPIO_InitStructure.GPIO_Pin = UART3_TX_PIN;
-        GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
+        GPIO_InitStructure.GPIO_OType = (options & SERIAL_INVERTED) ? GPIO_OType_PP : GPIO_OType_OD;
         GPIO_PinAFConfig(UART3_GPIO, UART3_TX_PINSOURCE, UART3_GPIO_AF);
         GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
+        if(!(options & SERIAL_INVERTED))
+            GPIO_SetBits(UART3_GPIO, UART3_TX_PIN);   // OpenDrain output should be inactive
     } else {
         if (mode & MODE_TX) {
             GPIO_InitStructure.GPIO_Pin = UART3_TX_PIN;
diff --git a/src/main/target/SPARKY/target.h b/src/main/target/SPARKY/target.h
index 15f3811b93..b5e4f094a2 100644
--- a/src/main/target/SPARKY/target.h
+++ b/src/main/target/SPARKY/target.h
@@ -106,6 +106,7 @@
 #define GPS
 #define DISPLAY
 #define USE_SERVOS
+#define TELEMETRY
 
 #define LED_STRIP
 #if 1
diff --git a/src/main/telemetry/smartport.c b/src/main/telemetry/smartport.c
index bf55828fbd..0c033446f0 100644
--- a/src/main/telemetry/smartport.c
+++ b/src/main/telemetry/smartport.c
@@ -162,10 +162,7 @@ static void smartPortDataReceive(uint16_t c)
     if (lastChar == FSSP_START_STOP) {
         smartPortState = SPSTATE_WORKING;
         smartPortLastRequestTime = now;
-        if ((c == FSSP_SENSOR_ID1) ||
-            (c == FSSP_SENSOR_ID2) ||
-            (c == FSSP_SENSOR_ID3) ||
-            (c == FSSP_SENSOR_ID4)) {
+        if (c == FSSP_SENSOR_ID1) {
             smartPortHasRequest = 1;
             // we only responde to these IDs
             // the X4R-SB does send other IDs, we ignore them, but take note of the time