diff --git a/src/main/drivers/serial.h b/src/main/drivers/serial.h
index 925fb3804a..d197991f77 100644
--- a/src/main/drivers/serial.h
+++ b/src/main/drivers/serial.h
@@ -20,8 +20,7 @@
 typedef enum portMode_t {
     MODE_RX = 1 << 0,
     MODE_TX = 1 << 1,
-    MODE_RXTX = MODE_RX | MODE_TX,
-    MODE_BIDIR = 1 << 3
+    MODE_RXTX = MODE_RX | MODE_TX
 } portMode_t;
 
 typedef enum portOptions_t {
@@ -31,6 +30,8 @@ typedef enum portOptions_t {
     SERIAL_STOPBITS_2    = 1 << 1,
     SERIAL_PARITY_NO     = 0 << 2,
     SERIAL_PARITY_EVEN   = 1 << 2,
+    SERIAL_UNIDIR        = 0 << 3,
+    SERIAL_BIDIR         = 1 << 3
 } portOptions_t;
 
 typedef void (*serialReceiveCallbackPtr)(uint16_t data);   // used by serial drivers to return frames to app
diff --git a/src/main/drivers/serial_uart.c b/src/main/drivers/serial_uart.c
index bf2ca2a879..19b5c0bb51 100644
--- a/src/main/drivers/serial_uart.c
+++ b/src/main/drivers/serial_uart.c
@@ -52,14 +52,19 @@ static void usartConfigurePinInversion(uartPort_t *uartPort) {
 #ifdef STM32F303xC
     uint32_t inversionPins = 0;
 
-    if (uartPort->port.mode & MODE_TX) {
-        inversionPins |= USART_InvPin_Tx;
+    // 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_RX) {
-        inversionPins |= USART_InvPin_Rx;
-    }
-
-    // Note: inversion when using MODE_BIDIR not supported yet.
 
     USART_InvPinCmd(uartPort->USARTx, inversionPins, inverted ? ENABLE : DISABLE);
 #endif
@@ -83,8 +88,6 @@ static void uartReconfigure(uartPort_t *uartPort)
         USART_InitStructure.USART_Mode |= USART_Mode_Rx;
     if (uartPort->port.mode & MODE_TX)
         USART_InitStructure.USART_Mode |= USART_Mode_Tx;
-    if (uartPort->port.mode & MODE_BIDIR)
-        USART_InitStructure.USART_Mode |= USART_Mode_Tx | USART_Mode_Rx;
 
     USART_Init(uartPort->USARTx, &USART_InitStructure);
 
@@ -98,14 +101,14 @@ serialPort_t *uartOpen(USART_TypeDef *USARTx, serialReceiveCallbackPtr callback,
     uartPort_t *s = NULL;
 
     if (USARTx == USART1) {
-        s = serialUSART1(baudRate, mode);
+        s = serialUSART1(baudRate, mode, options);
 #ifdef USE_USART2
     } else if (USARTx == USART2) {
-        s = serialUSART2(baudRate, mode);
+        s = serialUSART2(baudRate, mode, options);
 #endif
 #ifdef USE_USART3
     } else if (USARTx == USART3) {
-        s = serialUSART3(baudRate, mode);
+        s = serialUSART3(baudRate, mode, options);
 #endif
     } else {
         return (serialPort_t *)s;
@@ -125,7 +128,7 @@ serialPort_t *uartOpen(USART_TypeDef *USARTx, serialReceiveCallbackPtr callback,
 
     // Receive DMA or IRQ
     DMA_InitTypeDef DMA_InitStructure;
-    if ((mode & MODE_RX) || (mode & MODE_BIDIR)) {
+    if (mode & MODE_RX) {
         if (s->rxDMAChannel) {
             DMA_StructInit(&DMA_InitStructure);
             DMA_InitStructure.DMA_PeripheralBaseAddr = s->rxDMAPeripheralBaseAddr;
@@ -152,7 +155,7 @@ serialPort_t *uartOpen(USART_TypeDef *USARTx, serialReceiveCallbackPtr callback,
     }
 
     // Transmit DMA or IRQ
-    if ((mode & MODE_TX) || (mode & MODE_BIDIR)) {
+    if (mode & MODE_TX) {
         if (s->txDMAChannel) {
             DMA_StructInit(&DMA_InitStructure);
             DMA_InitStructure.DMA_PeripheralBaseAddr = s->txDMAPeripheralBaseAddr;
@@ -179,7 +182,7 @@ serialPort_t *uartOpen(USART_TypeDef *USARTx, serialReceiveCallbackPtr callback,
 
     USART_Cmd(s->USARTx, ENABLE);
 
-    if (mode & MODE_BIDIR)
+    if (options & SERIAL_BIDIR)
         USART_HalfDuplexCmd(s->USARTx, ENABLE);
     else
         USART_HalfDuplexCmd(s->USARTx, DISABLE);
diff --git a/src/main/drivers/serial_uart_impl.h b/src/main/drivers/serial_uart_impl.h
index 713405bc09..7ff2deb142 100644
--- a/src/main/drivers/serial_uart_impl.h
+++ b/src/main/drivers/serial_uart_impl.h
@@ -23,7 +23,7 @@ extern const struct serialPortVTable uartVTable[];
 
 void uartStartTxDMA(uartPort_t *s);
 
-uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode);
-uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode);
-uartPort_t *serialUSART3(uint32_t baudRate, portMode_t mode);
+uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode, portOptions_t options);
+uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode, portOptions_t options);
+uartPort_t *serialUSART3(uint32_t baudRate, portMode_t mode, portOptions_t options);
 
diff --git a/src/main/drivers/serial_uart_stm32f10x.c b/src/main/drivers/serial_uart_stm32f10x.c
index 02a99b3f66..09dd7520cf 100644
--- a/src/main/drivers/serial_uart_stm32f10x.c
+++ b/src/main/drivers/serial_uart_stm32f10x.c
@@ -84,7 +84,7 @@ void usartIrqCallback(uartPort_t *s)
 
 #ifdef USE_USART1
 // USART1 - Telemetry (RX/TX by DMA)
-uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode)
+uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode, portOptions_t options)
 {
     uartPort_t *s;
     static volatile uint8_t rx1Buffer[UART1_RX_BUFFER_SIZE];
@@ -118,17 +118,23 @@ uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode)
     // USART1_TX    PA9
     // USART1_RX    PA10
     gpio.speed = Speed_2MHz;
+
     gpio.pin = Pin_9;
-    gpio.mode = Mode_AF_PP;
-    if (mode & MODE_TX)
-        gpioInit(GPIOA, &gpio);
-    gpio.mode = Mode_AF_OD;
-    if (mode & MODE_BIDIR)
-        gpioInit(GPIOA, &gpio);
-    gpio.pin = Pin_10;
-    gpio.mode = Mode_IPU;
-    if (mode & MODE_RX)
+    if (options & SERIAL_BIDIR) {
+        gpio.mode = Mode_AF_OD;
         gpioInit(GPIOA, &gpio);
+    } else {
+        if (mode & MODE_TX) {
+            gpio.mode = Mode_AF_PP;
+            gpioInit(GPIOA, &gpio);
+        }
+
+        if (mode & MODE_RX) {
+            gpio.pin = Pin_10;
+            gpio.mode = Mode_IPU;
+            gpioInit(GPIOA, &gpio);
+        }
+    }
 
     // DMA TX Interrupt
     NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;
@@ -174,7 +180,7 @@ void USART1_IRQHandler(void)
 
 #ifdef USE_USART2
 // USART2 - GPS or Spektrum or ?? (RX + TX by IRQ)
-uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode)
+uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode, portOptions_t options)
 {
     uartPort_t *s;
     static volatile uint8_t rx2Buffer[UART2_RX_BUFFER_SIZE];
@@ -203,17 +209,23 @@ uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode)
     // USART2_TX    PA2
     // USART2_RX    PA3
     gpio.speed = Speed_2MHz;
+
     gpio.pin = Pin_2;
-    gpio.mode = Mode_AF_PP;
-    if (mode & MODE_TX)
-        gpioInit(GPIOA, &gpio);
-    gpio.mode = Mode_AF_OD;
-    if (mode & MODE_BIDIR)
-        gpioInit(GPIOA, &gpio);
-    gpio.pin = Pin_3;
-    gpio.mode = Mode_IPU;
-    if (mode & MODE_RX)
+    if (options & SERIAL_BIDIR) {
+        gpio.mode = Mode_AF_OD;
         gpioInit(GPIOA, &gpio);
+    } else {
+        if (mode & MODE_TX) {
+            gpio.mode = Mode_AF_PP;
+            gpioInit(GPIOA, &gpio);
+        }
+
+        if (mode & MODE_RX) {
+            gpio.pin = Pin_3;
+            gpio.mode = Mode_IPU;
+            gpioInit(GPIOA, &gpio);
+        }
+    }
 
     // RX/TX Interrupt
     NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
@@ -237,7 +249,7 @@ void USART2_IRQHandler(void)
 
 #ifdef USE_USART3
 // USART3
-uartPort_t *serialUSART3(uint32_t baudRate, portMode_t mode)
+uartPort_t *serialUSART3(uint32_t baudRate, portMode_t mode, portOptions_t options)
 {
     uartPort_t *s;
     static volatile uint8_t rx3Buffer[UART3_RX_BUFFER_SIZE];
@@ -268,17 +280,23 @@ uartPort_t *serialUSART3(uint32_t baudRate, portMode_t mode)
 #endif
 
     gpio.speed = Speed_2MHz;
+
     gpio.pin = USART3_TX_PIN;
-    gpio.mode = Mode_AF_PP;
-    if (mode & MODE_TX)
-        gpioInit(USART3_GPIO, &gpio);
-    gpio.mode = Mode_AF_OD;
-    if (mode & MODE_BIDIR)
-        gpioInit(USART3_GPIO, &gpio);
-    gpio.pin = USART3_RX_PIN;
-    gpio.mode = Mode_IPU;
-    if (mode & MODE_RX)
+    if (options & SERIAL_BIDIR) {
+        gpio.mode = Mode_AF_OD;
         gpioInit(USART3_GPIO, &gpio);
+    } else {
+        if (mode & MODE_TX) {
+            gpio.mode = Mode_AF_PP;
+            gpioInit(USART3_GPIO, &gpio);
+        }
+
+        if (mode & MODE_RX) {
+            gpio.pin = USART3_RX_PIN;
+            gpio.mode = Mode_IPU;
+            gpioInit(USART3_GPIO, &gpio);
+        }
+    }
 
     // RX/TX Interrupt
     NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
diff --git a/src/main/drivers/serial_uart_stm32f30x.c b/src/main/drivers/serial_uart_stm32f30x.c
index 6565e27fb0..fa16225616 100644
--- a/src/main/drivers/serial_uart_stm32f30x.c
+++ b/src/main/drivers/serial_uart_stm32f30x.c
@@ -82,7 +82,7 @@ static uartPort_t uartPort3;
 #endif
 
 #ifdef USE_USART1
-uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode)
+uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode, portOptions_t options)
 {
     uartPort_t *s;
     static volatile uint8_t rx1Buffer[UART1_RX_BUFFER_SIZE];
@@ -118,23 +118,23 @@ uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode)
     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
     GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
 
-    if (mode & MODE_TX) {
-        GPIO_InitStructure.GPIO_Pin = UART1_TX_PIN;
-        GPIO_PinAFConfig(UART1_GPIO, UART1_TX_PINSOURCE, UART1_GPIO_AF);
-        GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
-    }
-
-    if (mode & MODE_RX) {
-        GPIO_InitStructure.GPIO_Pin = UART1_RX_PIN;
-        GPIO_PinAFConfig(UART1_GPIO, UART1_RX_PINSOURCE, UART1_GPIO_AF);
-        GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
-    }
-
-    if (mode & MODE_BIDIR) {
+    if (options & SERIAL_BIDIR) {
         GPIO_InitStructure.GPIO_Pin = UART1_TX_PIN;
         GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
         GPIO_PinAFConfig(UART1_GPIO, UART1_TX_PINSOURCE, UART1_GPIO_AF);
         GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
+    } else {
+        if (mode & MODE_TX) {
+            GPIO_InitStructure.GPIO_Pin = UART1_TX_PIN;
+            GPIO_PinAFConfig(UART1_GPIO, UART1_TX_PINSOURCE, UART1_GPIO_AF);
+            GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
+        }
+
+        if (mode & MODE_RX) {
+            GPIO_InitStructure.GPIO_Pin = UART1_RX_PIN;
+            GPIO_PinAFConfig(UART1_GPIO, UART1_RX_PINSOURCE, UART1_GPIO_AF);
+            GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
+        }
     }
 
     // DMA TX Interrupt
@@ -157,7 +157,7 @@ uartPort_t *serialUSART1(uint32_t baudRate, portMode_t mode)
 #endif
 
 #ifdef USE_USART2
-uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode)
+uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode, portOptions_t options)
 {
     uartPort_t *s;
     static volatile uint8_t rx2Buffer[UART2_RX_BUFFER_SIZE];
@@ -197,23 +197,23 @@ uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode)
     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
     GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
 
-    if (mode & MODE_TX) {
-        GPIO_InitStructure.GPIO_Pin = UART2_TX_PIN;
-        GPIO_PinAFConfig(UART2_GPIO, UART2_TX_PINSOURCE, UART2_GPIO_AF);
-        GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
-    }
-
-    if (mode & MODE_RX) {
-        GPIO_InitStructure.GPIO_Pin = UART2_RX_PIN;
-        GPIO_PinAFConfig(UART2_GPIO, UART2_RX_PINSOURCE, UART2_GPIO_AF);
-        GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
-    }
-
-    if (mode & MODE_BIDIR) {
+    if (options & SERIAL_BIDIR) {
         GPIO_InitStructure.GPIO_Pin = UART2_TX_PIN;
         GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
         GPIO_PinAFConfig(UART2_GPIO, UART2_TX_PINSOURCE, UART2_GPIO_AF);
         GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
+    } else {
+        if (mode & MODE_TX) {
+            GPIO_InitStructure.GPIO_Pin = UART2_TX_PIN;
+            GPIO_PinAFConfig(UART2_GPIO, UART2_TX_PINSOURCE, UART2_GPIO_AF);
+            GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
+        }
+
+        if (mode & MODE_RX) {
+            GPIO_InitStructure.GPIO_Pin = UART2_RX_PIN;
+            GPIO_PinAFConfig(UART2_GPIO, UART2_RX_PINSOURCE, UART2_GPIO_AF);
+            GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
+        }
     }
 
 #ifdef USE_USART2_TX_DMA
@@ -238,7 +238,7 @@ uartPort_t *serialUSART2(uint32_t baudRate, portMode_t mode)
 #endif
 
 #ifdef USE_USART3
-uartPort_t *serialUSART3(uint32_t baudRate, portMode_t mode)
+uartPort_t *serialUSART3(uint32_t baudRate, portMode_t mode, portOptions_t options)
 {
     uartPort_t *s;
     static volatile uint8_t rx3Buffer[UART3_RX_BUFFER_SIZE];
@@ -278,23 +278,23 @@ uartPort_t *serialUSART3(uint32_t baudRate, portMode_t mode)
     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
     GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
 
-    if (mode & MODE_TX) {
-        GPIO_InitStructure.GPIO_Pin = UART3_TX_PIN;
-        GPIO_PinAFConfig(UART3_GPIO, UART3_TX_PINSOURCE, UART3_GPIO_AF);
-        GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
-    }
-
-    if (mode & MODE_RX) {
-        GPIO_InitStructure.GPIO_Pin = UART3_RX_PIN;
-        GPIO_PinAFConfig(UART3_GPIO, UART3_RX_PINSOURCE, UART3_GPIO_AF);
-        GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
-    }
-
-    if (mode & MODE_BIDIR) {
+    if (options & SERIAL_BIDIR) {
         GPIO_InitStructure.GPIO_Pin = UART3_TX_PIN;
         GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
         GPIO_PinAFConfig(UART3_GPIO, UART3_TX_PINSOURCE, UART3_GPIO_AF);
         GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
+    } else {
+        if (mode & MODE_TX) {
+            GPIO_InitStructure.GPIO_Pin = UART3_TX_PIN;
+            GPIO_PinAFConfig(UART3_GPIO, UART3_TX_PINSOURCE, UART3_GPIO_AF);
+            GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
+        }
+
+        if (mode & MODE_RX) {
+            GPIO_InitStructure.GPIO_Pin = UART3_RX_PIN;
+            GPIO_PinAFConfig(UART3_GPIO, UART3_RX_PINSOURCE, UART3_GPIO_AF);
+            GPIO_Init(UART3_GPIO, &GPIO_InitStructure);
+        }
     }
 
 #ifdef USE_USART3_TX_DMA
diff --git a/src/main/telemetry/smartport.c b/src/main/telemetry/smartport.c
index d2e30c330e..bf55828fbd 100644
--- a/src/main/telemetry/smartport.c
+++ b/src/main/telemetry/smartport.c
@@ -134,7 +134,7 @@ const uint16_t frSkyDataIdTable[] = {
 
 #define __USE_C99_MATH // for roundf()
 #define SMARTPORT_BAUD 57600
-#define SMARTPORT_UART_MODE MODE_BIDIR
+#define SMARTPORT_UART_MODE MODE_RXTX
 #define SMARTPORT_SERVICE_DELAY_MS 5 // telemetry requests comes in at roughly 12 ms intervals, keep this under that
 #define SMARTPORT_NOT_CONNECTED_TIMEOUT_MS 7000
 
@@ -229,11 +229,19 @@ void freeSmartPortTelemetryPort(void)
 
 void configureSmartPortTelemetryPort(void)
 {
+    portOptions_t portOptions;
+
     if (!portConfig) {
         return;
     }
 
-    smartPortSerialPort = openSerialPort(portConfig->identifier, FUNCTION_TELEMETRY_SMARTPORT, NULL, SMARTPORT_BAUD, SMARTPORT_UART_MODE, telemetryConfig->telemetry_inversion ? SERIAL_INVERTED : SERIAL_NOT_INVERTED);
+    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) {
         return;