Cleaning up PinNames.h for SDP-K1 board.

Added pin description comments to Arduino header pins and LED4.
Added I2C alias names.
Removed Oscillator and DEBUG pin definitions.
Use USBTX and USBRX for serial communications back to PC. Do not use STDIO_UART_TX and STDIO_UART_RX

Author: malavikasajikumar

targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F469xI/TARGET_SDP_K1/PinNames.h

@@ -267,54 +267,45 @@ typedef enum {
     ADC_VBAT = 0xF2,
 
     // Arduino connector namings
-    A0          = PA_2,
-    A1          = PA_4,
-    A2          = PA_6,
-    A3          = PC_1,
-    A4          = PC_4,
-    A5          = PC_5,
+    A0          = PA_2,   // ADC 0 / GPIO 16
+    A1          = PA_4,   // ADC 1 / GPIO 17
+    A2          = PA_6,   // ADC 2 / GPIO 18
+    A3          = PC_1,   // ADC 3 / GPIO 19
+    A4          = PC_4,   // ADC 4 / GPIO 20 
+    A5          = PC_5,   // ADC 5 / GPIO 21 
 
-    D0          = PA_1,
-    D1          = PA_0,
-    D2          = PG_7,
-    D3          = PD_12,
-    D4          = PG_9,
-    D5          = PA_11,
-    D6          = PA_10,
-    D7          = PG_10,
-    D8          = PG_11,
-    D9          = PB_15,
-    D10         = PA_15,  // SPI CS
-    D11         = PA_7,   // SPI MOSI
-    D12         = PB_4,   // SPI MISO
-    D13         = PB_3,   // SPI SCK
-    D14         = PB_7,   // I2C SDA
-    D15         = PB_8,   // I2C SCL
+    D0          = PA_1,   // UART RX / GPIO 0 
+    D1          = PA_0,   // UART TX / GPIO 1 
+    D2          = PG_7,   // GPIO 2 
+    D3          = PD_12,  // TMR / PWM / GPIO 3
+    D4          = PG_9,   // GPIO 4
+    D5          = PA_11,  // TMR / PWM / GPIO 5
+    D6          = PA_10,  // TMR / PWM / GPIO 6
+    D7          = PG_10,  // GPIO 7
+    D8          = PG_11,  // GPIO 8
+    D9          = PB_15,  // TMR / PWM / GPIO 9
+    D10         = PA_15,  // SPI CS / TMR / PWM / GPIO 10
+    D11         = PA_7,   // SPI MOSI / TMR / PWM / GPIO 11
+    D12         = PB_4,   // SPI MISO / GPIO 12
+    D13         = PB_3,   // SPI SCK / GPIO 13
+    D14         = PB_7,   // I2C SDA / GPIO 14 
+    D15         = PB_8,   // I2C SCL / GPIO 15
 
-    // STDIO for console print
-#ifdef MBED_CONF_TARGET_STDIO_UART_TX
-    STDIO_UART_TX = MBED_CONF_TARGET_STDIO_UART_TX,
-#else
-    STDIO_UART_TX = PC_12,
-#endif
-#ifdef MBED_CONF_TARGET_STDIO_UART_RX
-    STDIO_UART_RX = MBED_CONF_TARGET_STDIO_UART_RX,
-#else
-    STDIO_UART_RX = PD_2,
-#endif
+    // I2C alias added here
+    I2C_SDA		= D14,    // I2C SDA // should only be used as I2C line as uses pull ups on them 
+    I2C_SCL     = D15,    // I2C SCL // should only be used as I2C line as uses pull ups on them
 
-    // Debug pins
-    DEBUG_GPIO0 = PG_6,
     // Generic signals namings
     LED1        = PK_7, // Red LED
     LED2        = PK_6, // Orange LED
     LED3        = PK_5, // Green LED
-    LED4        = PK_4,
-    SERIAL_TX   = STDIO_UART_TX,
-    SERIAL_RX   = STDIO_UART_RX,
-    USBTX       = STDIO_UART_TX,
-    USBRX       = STDIO_UART_RX,
+    LED4        = PK_4,	// Status LED
 
+    USBTX       = PC_12,  // Use USBTX and USBRX for serial communications back to PC. Do not
+    USBRX       = PD_2,   // use STDIO_UART_TX and STDIO_UART_RX	
+    STDIO_UART_TX = USBTX,
+    STDIO_UART_RX = USBRX,
+	
     // Adding these signals for the SDP connector
     SDP_SPI_MOSI = PF_9,  // SDP Connector for SPI lines
     SDP_SPI_MISO = PF_8,
@@ -352,14 +343,6 @@ typedef enum {
     USB_OTG_HS_ULPI_NXT = PC_3,
     USB_OTG_HS_ULPI_STP = PC_0,
 
-    /**** OSCILLATOR pins ****/
-    RCC_OSC32_IN = PC_14,
-    RCC_OSC32_OUT = PC_15,
-
-    /**** DEBUG pins ****/
-    SYS_JTCK_SWCLK = PA_14,
-    SYS_JTMS_SWDIO = PA_13,
-
     // Not connected
     NC = (int)0xFFFFFFFF
 } PinName;