LM4f120 launchpad for using both UART0 and UART2

Test environments:

1. LM4F120 Launchpad

2. uart_echo project

3. CCS v5

Question:

I would like to use both UART0 and UART2 simultaneously. So, I set as follows "my test code".

I also add UART interrupt service routine to startup_ccs.c

UART0 is OK. But UART2 of PD7(U2TX) is not working. I can not see any signals from Oscilloscope at PIN PD7.

I would like to see both PD7 and PA1 signals with Oscilloscope.

Would you let me know my wrong? 

======== My test Code ==================

//*****************************************************************************
//
// uart_echo.c - Example for reading data from and writing data to the UART in
// an interrupt driven fashion.
// This is part of revision 9453 of the EK-LM4F120XL Firmware Package.
//
//*****************************************************************************

#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/fpu.h"
#include "driverlib/gpio.h"
#include "driverlib/interrupt.h"
#include "driverlib/pin_map.h"
#include "driverlib/rom.h"
#include "driverlib/sysctl.h"
#include "driverlib/uart.h"

//*****************************************************************************
//
//! \addtogroup example_list
//! <h1>UART Echo (uart_echo)</h1>
//!
//! This example application utilizes the UART to echo text. The first UART
//! (connected to the USB debug virtual serial port on the evaluation board)
//! will be configured in 115,200 baud, 8-n-1 mode. All characters received on
//! the UART are transmitted back to the UART.
//
//*****************************************************************************

//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, unsigned long ulLine)
{
}
#endif

//*****************************************************************************
//
// The UART interrupt handler.
//
//*****************************************************************************
void
UART0IntHandler(void)
{
unsigned long ulStatus;

//
// Get the interrrupt status.
//
ulStatus = ROM_UARTIntStatus(UART0_BASE, true);

//
// Clear the asserted interrupts.
//
ROM_UARTIntClear(UART0_BASE, ulStatus);

//
// Loop while there are characters in the receive FIFO.
//
while(0)//ROM_UARTCharsAvail(UART0_BASE))
{
//
// Read the next character from the UART and write it back to the UART.
//
// ROM_UARTCharPutNonBlocking(UART0_BASE,
// ROM_UARTCharGetNonBlocking(UART0_BASE));

//
// Blink the LED to show a character transfer is occuring.
//
//GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);

//
// Delay for 1 millisecond. Each SysCtlDelay is about 3 clocks.
//
SysCtlDelay(SysCtlClockGet() / (1000 * 3));

//
// Turn off the LED
//
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);

}
}

void
UART2IntHandler(void)
{
unsigned long ulStatus;

//
// Get the interrrupt status.
//
ulStatus = ROM_UARTIntStatus(UART2_BASE, true);

//
// Clear the asserted interrupts.
//
ROM_UARTIntClear(UART2_BASE, ulStatus);

//
// Loop while there are characters in the receive FIFO.
//
while(0)//ROM_UARTCharsAvail(UART0_BASE))
{
//
// Read the next character from the UART and write it back to the UART.
//
// ROM_UARTCharPutNonBlocking(UART0_BASE,
// ROM_UARTCharGetNonBlocking(UART0_BASE));

//
// Blink the LED to show a character transfer is occuring.
//
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);

//
// Delay for 1 millisecond. Each SysCtlDelay is about 3 clocks.
//
SysCtlDelay(SysCtlClockGet() / (1000 * 3));

//
// Turn off the LED
//
//GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);

}
}

//*****************************************************************************
//
// Send a string to the UART.
//
//*****************************************************************************
void
UARTSend(const unsigned char *pucBuffer, unsigned long ulCount)
{
//
// Loop while there are more characters to send.
//
while(ulCount--)
{
//
// Write the next character to the UART.
//
ROM_UARTCharPutNonBlocking(UART0_BASE, *pucBuffer++);
}
}

void
UART2Send(const unsigned char *pucBuffer, unsigned long ulCount)
{
//
// Loop while there are more characters to send.
//
while(ulCount--)
{
//
// Write the next character to the UART.
//
ROM_UARTCharPutNonBlocking(UART2_BASE, *pucBuffer++);
}
}

//*****************************************************************************
//
// This example demonstrates how to send a string of data to the UART.
//
//*****************************************************************************
int
main(void)
{
//
// Enable lazy stacking for interrupt handlers. This allows floating-point
// instructions to be used within interrupt handlers, but at the expense of
// extra stack usage.
//
ROM_FPUEnable();
ROM_FPULazyStackingEnable();

//
// Set the clocking to run directly from the crystal.
//
ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);

//
// Enable the GPIO port that is used for the on-board LED.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

//
// Enable the GPIO pins for the LED (PF2).
//
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);

//
// Enable the peripherals used by this example.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART2);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);

//
// Enable processor interrupts.
//
ROM_IntMasterEnable();

//
// Set GPIO A0 and A1 as UART pins.
//
GPIOPinConfigure(GPIO_PA0_U0RX);
GPIOPinConfigure(GPIO_PA1_U0TX);
ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

GPIOPinConfigure(GPIO_PD6_U2RX);
GPIOPinConfigure(GPIO_PD7_U2TX);
ROM_GPIOPinTypeUART(GPIO_PORTD_BASE, GPIO_PIN_6 | GPIO_PIN_7);

//
// Configure the UART for 115,200, 8-N-1 operation.
//
ROM_UARTConfigSetExpClk(UART0_BASE, ROM_SysCtlClockGet(), 9600,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
UART_CONFIG_PAR_NONE));

ROM_UARTConfigSetExpClk(UART2_BASE, ROM_SysCtlClockGet(), 9600,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
UART_CONFIG_PAR_NONE));

//
// Enable the UART interrupt.
//
ROM_IntEnable(INT_UART0);
ROM_UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_RT);

ROM_IntEnable(INT_UART2);
ROM_UARTIntEnable(UART2_BASE, UART_INT_RX | UART_INT_RT);

//
// Prompt for text to be entered.
//
//UARTSend((unsigned char *)"\033[2JEntertext0: ", 16);

//
// Loop forever echoing data through the UART.
//
while(1)
{
UARTSend((unsigned char *)"\033[2JEntertext0: ", 16);
UART2Send((unsigned char *)"\033[2JEntertext2: ", 16);
}
}