Stellaris LM3S8962 Port E Interrupt

Question

I am new to Stellaris LM3S8962. I want to inquire about how to write 4 separate ISRs to handle interrupts originated from 4 buttons Up, Down, Left, Right. I have tried but my code always fell into FaultISR. Thanks!

Answer 1

https://www.dropbox.com/s/5j5il9kt324o943/Lab%202.rar?dl=0

The link above is my project. It works fine, but when I add the following statements to the Startup task it would fall into FaultISR

// Configure the UART 
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
// Enable processor interrupts.
IntMasterEnable();
// Set GPIO A0 and A1 as UART pins.
GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
// Configure the UART for 9600, 8-N-1 operation.
UARTConfigSetExpClk(UART0_BASE, SysCtlClockGet(), 9600,
                        (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
                         UART_CONFIG_PAR_NONE));
// Enable the UART interrupt.
IntEnable(INT_UART0);
UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_RT);