provide default initialization of some local variables in serial_api.c:serial_format()

Author: Rohit Grover

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC176X/serial_api.c

@@ -84,13 +84,13 @@ static struct serial_global_data_s uart_data[UART_NUM];
 
 void serial_init(serial_t *obj, PinName tx, PinName rx) {
     int is_stdio_uart = 0;
-    
+
     // determine the UART to use
     UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
     UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
     UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
     MBED_ASSERT((int)uart != NC);
-    
+
     obj->uart = (LPC_UART_TypeDef *)uart;
     // enable power
     switch (uart) {
@@ -110,19 +110,19 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     obj->uart->IER = 0 << 0  // Rx Data available irq enable
                    | 0 << 1  // Tx Fifo empty irq enable
                    | 0 << 2; // Rx Line Status irq enable
-    
+
     // set default baud rate and format
     serial_baud  (obj, 9600);
     serial_format(obj, 8, ParityNone, 1);
-    
+
     // pinout the chosen uart
     pinmap_pinout(tx, PinMap_UART_TX);
     pinmap_pinout(rx, PinMap_UART_RX);
-    
+
     // set rx/tx pins in PullUp mode
     pin_mode(tx, PullUp);
     pin_mode(rx, PullUp);
-    
+
     switch (uart) {
         case UART_0: obj->index = 0; break;
         case UART_1: obj->index = 1; break;
@@ -132,9 +132,9 @@ void serial_init(serial_t *obj, PinName tx, PinName rx) {
     uart_data[obj->index].sw_rts.pin = NC;
     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));
@@ -166,9 +166,9 @@ void serial_baud(serial_t *obj, int baudrate) {
         case UART_3: LPC_SC->PCLKSEL1 &= ~(0x3 << 18); LPC_SC->PCLKSEL1 |= (0x1 << 18); break;
         default: break;
     }
-    
+
     uint32_t PCLK = SystemCoreClock;
-    
+
     // First we check to see if the basic divide with no DivAddVal/MulVal
     // ratio gives us an integer result. If it does, we set DivAddVal = 0,
     // MulVal = 1. Otherwise, we search the valid ratio value range to find
@@ -229,16 +229,16 @@ void serial_baud(serial_t *obj, int baudrate) {
             }
         }
     }
-    
+
     // set LCR[DLAB] to enable writing to divider registers
     obj->uart->LCR |= (1 << 7);
-    
+
     // set divider values
     obj->uart->DLM = (DL >> 8) & 0xFF;
     obj->uart->DLL = (DL >> 0) & 0xFF;
     obj->uart->FDR = (uint32_t) DivAddVal << 0
                    | (uint32_t) MulVal    << 4;
-    
+
     // clear LCR[DLAB]
     obj->uart->LCR &= ~(1 << 7);
 }
@@ -260,9 +260,10 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
         case ParityForced1: parity_enable = 1; parity_select = 2; break;
         case ParityForced0: parity_enable = 1; parity_select = 3; break;
         default:
+            parity_enable = 0, parity_select = 0;
             break;
     }
-    
+
     obj->uart->LCR = data_bits            << 0
                    | stop_bits            << 2
                    | parity_enable        << 3
@@ -310,7 +311,7 @@ static void serial_irq_set_internal(serial_t *obj, SerialIrq irq, uint32_t enabl
         case UART_2: irq_n=UART2_IRQn; vector = (uint32_t)&uart2_irq; break;
         case UART_3: irq_n=UART3_IRQn; vector = (uint32_t)&uart3_irq; break;
     }
-    
+
     if (enable) {
         obj->uart->IER |= 1 << irq;
         NVIC_SetVector(irq_n, vector);