USING CCS PROGRAMMING PLEASE MODIFY THE CODE BELOW TO DO THE FOLLOWING:

-Click button S1 to double the LED blinking frequency.

-Click button S2 to decrease the LED blinking frequency by half.

-Define a minimum 2^-4 Hz and a maximum 2⁴ Hz blinking frequencies.

#include

#include

#include //Exact-width integer types

#include //Driver library

#define DCO_FREQ 48e6 //unit: Hz; DCO nominal frequencies: 1.5, 3, 6, 12, 24,

48 MHz.

#define TIMER0_FREQ 1 //unit: Hz

#define SYSTICK_FREQ 200 //unit: Hz

#define RED_LED GPIO_PIN0

#define GREEN_LED GPIO_PIN1

#define BLUE_LED GPIO_PIN2

#define BUTTON_S1 GPIO_PIN1

#define NUM_DEBOUNCE_CHECKS 10 //For 50 msec debounce time.

#define NUM_DISP_TEXT_LINE 4

//function prototypes

void initDevice(void);

void initGPIO(void);

void initTimer(void);

void initUART(void);

void uart0_transmitStr(const char *str);

// global variables

uint32_t clockMCLK;

uint8_t currentLED = RED_LED;

volatile uint32_t buttonStateIndex;

volatile uint32_t buttonS1_pressed = 0; //0: unpressed, 1: pressed

const char *terminalDisplayText[NUM_DISP_TEXT_LINE] =

{

" ",

"UART and User Button Demo ",

"R: red, G: green, B:blue, H: Help ",

"> "

};

void main(void)

{

uint32_t i;

uint8_t data;

initDevice();

initGPIO();

initTimer();

initUART();

Interrupt_enableMaster();

Timer32_startTimer(TIMER32_0_BASE, false);

// Initial display on terminal.

for(i=0; i

{

uart0_transmitStr(terminalDisplayText[i]);

}

while(1)

{

// Handle UART communicataion from host PC to MSP432.

if(UART_getInterruptStatus(EUSCI_A0_BASE,

EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG))

{

data = UART_receiveData(EUSCI_A0_BASE);

UART_clearInterruptFlag(EUSCI_A0_BASE,

EUSCI_A_UART_RECEIVE_INTERRUPT_FLAG);

switch(data)

{

case 'R':

case 'r':

currentLED = RED_LED;

uart0_transmitStr("Blink red LED. > ");

break;

case 'G':

case 'g':

currentLED = GREEN_LED;

uart0_transmitStr("Blink green LED. > ");

break;

case 'B':

case 'b':

currentLED = BLUE_LED;

uart0_transmitStr("Blink blue LED. > ");

break;

case 'H':

case 'h':

for(i=0; i

{

uart0_transmitStr(terminalDisplayText[i]);

}

break;

}

} //end of if

if(buttonS1_pressed)

{

buttonS1_pressed = 0;

uart0_transmitStr("Button S1 is pressed. > ");

// And you can do other things here in response to button S1 being

pressed.

}

} //end of while

}

void initDevice(void)

{

WDT_A_holdTimer(); //stop Watchdog timer

//Change VCORE to 1 to support a frequency higher than 24MHz.

//See data sheet for Flash wait-state requirement for a given frequency.

PCM_setPowerState(PCM_AM_LDO_VCORE1);

FlashCtl_setWaitState(FLASH_BANK0, 1);

FlashCtl_setWaitState(FLASH_BANK1, 1);

//Enable FPU for DCO Frequency calculation.

FPU_enableModule();

//Only use DCO nominal frequencies: 1.5, 3, 6, 12, 24, 48MHz.

CS_setDCOFrequency(DCO_FREQ);

//Divider: 1, 2, 4, 8, 16, 32, 64, or 128.

//SMCLK is used by UART.

CS_initClockSignal(CS_MCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_1);

CS_initClockSignal(CS_HSMCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_8);

CS_initClockSignal(CS_SMCLK, CS_DCOCLK_SELECT, CS_CLOCK_DIVIDER_16);

clockMCLK = CS_getMCLK();

}

void initGPIO(void)

{

//Configure P2.0, P2.1, P2.2 as output.

//P2.0, P2.1, P2.2 are connected to a RGB tri-color LED on LaunchPad.

GPIO_setAsOutputPin(GPIO_PORT_P2, GPIO_PIN0|GPIO_PIN1|GPIO_PIN2);

//Configure P1.1 (button S1) as an input and enable interrupts.

GPIO_setAsInputPinWithPullUpResistor(GPIO_PORT_P1, GPIO_PIN1);

GPIO_clearInterruptFlag(GPIO_PORT_P1, GPIO_PIN1);

GPIO_interruptEdgeSelect(GPIO_PORT_P1, GPIO_PIN1, GPIO_HIGH_TO_LOW_TRANSITION);

GPIO_enableInterrupt(GPIO_PORT_P1, GPIO_PIN1);

Interrupt_enableInterrupt(INT_PORT1);

}

void initTimer(void)

{

Timer32_initModule(TIMER32_0_BASE, TIMER32_PRESCALER_1, TIMER32_32BIT,

TIMER32_PERIODIC_MODE);

Timer32_setCount(TIMER32_0_BASE, clockMCLK/TIMER0_FREQ);

Timer32_enableInterrupt(TIMER32_0_BASE);

Interrupt_enableInterrupt(INT_T32_INT1); // Enable Timer32_0 interrupt in the

interrupt controller.

//SysTick is clocked with the CPU free running clock, MCLK.

//The set period must be between 1 and 16,777,215.

SysTick_setPeriod(clockMCLK/SYSTICK_FREQ);

}

void initUART(void)

{

//Configuration for 3MHz SMCLK, 9600 baud rate.

//Calculated using the online calculator that TI provides at:

//http://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/MSP430BaudRateConver

ter/index.html

const eUSCI_UART_Config config =

{

EUSCI_A_UART_CLOCKSOURCE_SMCLK, //SMCLK Clock Source

19, //BRDIV = 19

8, //UCxBRF = 8

0, //UCxBRS = 0

EUSCI_A_UART_NO_PARITY, //No Parity

EUSCI_A_UART_LSB_FIRST, //MSB First

EUSCI_A_UART_ONE_STOP_BIT, //One stop bit

EUSCI_A_UART_MODE, //UART mode

EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION //Oversampling

};

//Configure GPIO pins for UART. RX: P1.2, TX:P1.3.

GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P1, GPIO_PIN2|GPIO_PIN3,

GPIO_PRIMARY_MODULE_FUNCTION);

UART_initModule(EUSCI_A0_BASE, &config);

UART_enableModule(EUSCI_A0_BASE);

}

//Transmit a string through UART0.

void uart0_transmitStr(const char *str)

{

uint32_t len, i=0;

len = strlen(str);

while(i < len)

{

UART_transmitData(EUSCI_A0_BASE, str[i++]);

while(!UART_getInterruptStatus(EUSCI_A0_BASE,

EUSCI_A_UART_TRANSMIT_COMPLETE_INTERRUPT_FLAG));

UART_clearInterruptFlag(EUSCI_A0_BASE,

EUSCI_A_UART_TRANSMIT_COMPLETE_INTERRUPT_FLAG);

}

}

//Timer32_0 ISR

void T32_INT1_IRQHandler(void)

{

Timer32_clearInterruptFlag(TIMER32_0_BASE);

if(GPIO_getInputPinValue(GPIO_PORT_P2, GPIO_PIN0|GPIO_PIN1|GPIO_PIN2))

{

GPIO_setOutputLowOnPin(GPIO_PORT_P2, GPIO_PIN0|GPIO_PIN1|GPIO_PIN2);

}

else

{

GPIO_setOutputHighOnPin(GPIO_PORT_P2, currentLED);

}

}

//Port P1 ISR

void PORT1_IRQHandler(void)

{

uint8_t status;

status = GPIO_getEnabledInterruptStatus(GPIO_PORT_P1);

GPIO_clearInterruptFlag(GPIO_PORT_P1, status);

if(status & BUTTON_S1)

{

//Start SysTick for debouncing button

uart0_transmitStr("Button S1 interrupt triggered. > ");

buttonStateIndex = 0;

SysTick->VAL = 0; //To cause immediate reload to SysTick counter.

SysTick_enableModule(); //Enable and start the SysTick counter.

SysTick_enableInterrupt();

}

}

//SysTick ISR

void SysTick_Handler(void)

{

uint8_t buttonState;

//P1.1 is configured with a pull-up resistor, so P1.1 = 0 when pressed.

//buttonState = 1 when pressed, which is opposite to P1.1 value.

buttonState = GPIO_getInputPinValue(GPIO_PORT_P1, BUTTON_S1);

buttonState = BUTTON_S1 & (~buttonState);

buttonStateIndex++;

if((buttonState & BUTTON_S1) == 0)

{

SysTick_disableInterrupt();

SysTick_disableModule();

}

else if(buttonStateIndex >= NUM_DEBOUNCE_CHECKS)

{

//Button S1 is pressed

SysTick_disableInterrupt();

SysTick_disableModule();

buttonS1_pressed = 1;

}

}