All information on the microprocessor used in this problem can be found here:

http://www.ti.com/lit/ds/spms376e/spms376e.pdf

In this question, data received by UART 0 will be processed by an Interrupt Service Routine.

a) Write the serial_init() function to initialize UART0 as follows [7pts]:

Receive Only

9,600 baud rate

8 data bits

Even parity

2 stop bit

Disable FIFOs

Enable UART Receive interrupts only

You may initialize unrelated control bits as you wish.

// Initialize UART0

void serial_init()

{

// 1. Setup GPIO

//A. Configure GPIO module associated with UART 0

// i. Turn on clock for GPIO module Port A

// ii.Enable Alternate function and set Peripheral functionality

// iii. set digital or analog mode, and pin directions

// 2. Setup UART device

// A) Configure UART functionality, frame format and Baud speed

//Disable uart0 device while we set it up

// Set desired UART functionality

//set frame format: 8 data bits, no FIFO, 2 stop bit, Even parity

//Set baud rate (9600 Baud)

//Use system clock as UART clock source

// B) Setup UART 0 Interrupts

// 3. NVIC setup

// A) Configure NVIC to allow UART interrupts

// B) Bind UART0 interrupt requests to Users Interrupt Handler

IntRegister( ); //complete this function

//re-enable uart

}

b) Write code for UART0 ISR handler function to implement the Interrupt Service Routine (ISR) that processes the occurrence of a UART0 received data interrupt. In addition, within this ISR turn on an LED connected to GPIO Port B pin 3 when an L (for Light) is received by UART0 by writing a 1 to the LED, and turn off this LED when an O (for Off) is received by writing a 0 to the LED. [7pts]

// UART0 Sample ISR

void My_UART0_Handler()

{

// 1) Check if Handler called due to a RX event

// 2) Clear the RX Interrupt Status. Why are we doing this //step ?

// 3) Application specific functionality

// Get byte from UART

// Check if an O or L ASCII charter was received

}

c) Complete main() to print LED turned ON and LED turned OFF once each time the LED is turned on or off respectively. [6pts]

void My_UART0_Handler();

void serial_init(void);

int main()

{

init_portB(); // Assume implemented correctly in Question 2

serial_init();

IntMasterEnable();//Globally allows CPU to service interrupts

while (1)

{

//Print each time the LED is turned ON or OFF

// YOUR CODE HERE

}

return 0;

}