update stdio uart for lpc4337 and set baudrate to 9600

Author: sg-

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/PeripheralNames.h

@@ -88,7 +88,7 @@ typedef enum {
 
 #define STDIO_UART_TX     USBTX
 #define STDIO_UART_RX     USBRX
-#define STDIO_UART        UART_2
+#define STDIO_UART        UART_0
 
 // Default peripherals
 #define MBED_SPI0         SPI0_MOSI, SPI0_MISO, SPI0_SCK, SPI0_SSEL

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC43XX/serial_api.c

@@ -134,8 +134,7 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
                    | 0 << 2; // Rx Line Status irq enable
 
     // set default baud rate and format
-    is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);   
-    serial_baud  (obj, is_stdio_uart ? 115200 : 9600);
+    serial_baud  (obj, 9600);
     serial_format(obj, 8, ParityNone, 1);
 
     // pinout the chosen uart
@@ -160,6 +159,8 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     uart_data[obj->index].sw_cts.pin = NC;
     serial_set_flow_control(obj, FlowControlNone, NC, NC);
 
+    is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
+    
     if (is_stdio_uart) {
         stdio_uart_inited = 1;
         memcpy(&stdio_uart, obj, sizeof(serial_t));