Change SERIAL_TX/RX from PB6/7 back to PA2/3 to match MTS_DRAGONFLY_F411RE platforms

Author: felser

targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F413xH/TARGET_MTS_DRAGONFLY_F413RH/PinNames.h

@@ -132,18 +132,19 @@ typedef enum {
     LED4        = D3,
     LED_RED     = LED1,
     BUTTON1     = NC,
-    STDIO_UART_TX = PB_6,
-    STDIO_UART_RX = PB_7,
-    SERIAL_TX   = STDIO_UART_TX,
-    SERIAL_RX   = STDIO_UART_RX,
-    USBTX       = STDIO_UART_TX,
-    USBRX       = STDIO_UART_RX,
+// STDIO for console print    
+    STDIO_UART_TX = USBTX,
+    STDIO_UART_RX = USBRX,
+    SERIAL_TX   = D1,
+    SERIAL_RX   = D0,
     SERIAL_RTS  = D3,
     SERIAL_CTS  = D6,
     SERIAL_DCD  = D4,
     SERIAL_DSR  = D5,
     SERIAL_DTR  = D7,
     SERIAL_RI   = D8,
+    USBTX       = PB_6,
+    USBRX       = PB_7,    
     RADIO_TX    = PC_6,
     RADIO_RX    = PC_7,
     RADIO_RTS   = PB_10,