diff --git a/src/machine/board_feather-nrf52840-sense.go b/src/machine/board_feather-nrf52840-sense.go
index 4d8804f73..8a4f71446 100644
--- a/src/machine/board_feather-nrf52840-sense.go
+++ b/src/machine/board_feather-nrf52840-sense.go
@@ -72,8 +72,8 @@ const (
 
 // UART0 pins (logical UART1)
 const (
-	UART_RX_PIN = D0
-	UART_TX_PIN = D1
+	UART_RX_PIN = D1
+	UART_TX_PIN = D0
 )
 
 // I2C pins
@@ -99,3 +99,7 @@ var (
 	usb_VID uint16 = 0x239A
 	usb_PID uint16 = 0x8088
 )
+
+var (
+	DefaultUART = UART0
+)
diff --git a/src/machine/board_feather-nrf52840.go b/src/machine/board_feather-nrf52840.go
index 488d9608b..e433e1037 100644
--- a/src/machine/board_feather-nrf52840.go
+++ b/src/machine/board_feather-nrf52840.go
@@ -72,8 +72,8 @@ const (
 
 // UART0 pins (logical UART1)
 const (
-	UART_RX_PIN = D0
-	UART_TX_PIN = D1
+	UART_RX_PIN = D1
+	UART_TX_PIN = D0
 )
 
 // I2C pins
@@ -99,3 +99,7 @@ var (
 	usb_VID uint16 = 0x239A
 	usb_PID uint16 = 0x802A
 )
+
+var (
+	DefaultUART = UART0
+)