MSP430F6638: IRDA Example code

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#include "driverlib.h"

//******************************************************************************
//! This example shows how to configure the UART module to echo a received
//! character. To echo a received character, RX ISR is used.
//!
//!                MSP430F6638
//!             -----------------
//!         /|\|                 |
//!          | |                 |
//!          --|RST              |
//!            |                 |
//!            |     P2.4/UCA0TXD|------------>
//!            |                 | 9600
//!            |     P2.5/UCA0RXD|<------------
//!
//!
//! This example uses the following peripherals and I/O signals.  You must
//! review these and change as needed for your own board:
//! - UART peripheral
//! - GPIO Port peripheral (for UART pins)
//! - UCA0TXD
//! - UCA0RXD
//!
//! This example uses the following interrupt handlers.  To use this example
//! in your own application you must add these interrupt handlers to your
//! vector table.
//! - USCI_A0_VECTOR.
//******************************************************************************

#define BAUD_RATE                               9600
#define RECEIVE_DATA_COUNT                      0x02
#define USCI_A_UART_MULTIPROCESSOR_MODE_ADDRESS        0xAA

#define UCS_XT2_TIMEOUT 50000		//Desired Timeout for XT2 initialization
#define UCS_XT1_CRYSTAL_FREQUENCY    32768		//XT1 Crystal Frequency being used
#define UCS_XT2_CRYSTAL_FREQUENCY   4000000		//XT2 Crystal Frequency being used


uint8_t returnValue = 0;		//Variable to store returned STATUS_SUCCESS or STATUS_FAIL

uint8_t receivedData = 0x00;
uint8_t receiveDataCount = 0x00;

void Init_Clock(void);

void Init_UART(void);

void Init_IrDA (void);

void main (void)
{
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
		
		Init_Clock();
		
		//Init_UART();	
		Init_IrDA();
		__bis_SR_register(GIE);
		

		while(1)
		{
			USCI_A_UART_transmitData(USCI_A0_BASE,
            'M'
            );
		}
 }

//******************************************************************************
//
//Function definition .
//
//******************************************************************************

void Init_Clock(void)
{
	/**********Clock Setup***************************************/
		//Port select HF XT2
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P7,
        GPIO_PIN2 + GPIO_PIN3
        );

    //Initializes the XT1 and XT2 crystal frequencies being used
    UCS_setExternalClockSource(
        UCS_XT1_CRYSTAL_FREQUENCY,
        UCS_XT2_CRYSTAL_FREQUENCY
        );
		
    //Initialize XT2. Returns STATUS_SUCCESS if initializes successfully
    returnValue = UCS_turnOnXT2WithTimeout(
        UCS_XT2_DRIVE_4MHZ_8MHZ,
        UCS_XT2_TIMEOUT
        );
		
    //Select XT2 as SMCLK source
    UCS_initClockSignal(
        UCS_SMCLK,
        UCS_XT2CLK_SELECT,
        UCS_CLOCK_DIVIDER_1
        );
		/********End**************************************************/
}


void Init_UART(void)
{	
/**********UART 1 --> USCI_A0__________Start*****************/
		
    //----------BR 9600 @ 4MHz---------------------------
    //Baudrate = 9600, clock freq = 4MHz
    //UCBRx = 26, UCBRFx = 10, UCBRSx = 6, UCOS16 = 1
    USCI_A_UART_initParam param = {0};
    param.selectClockSource = USCI_A_UART_CLOCKSOURCE_SMCLK;
    param.clockPrescalar = 26;
    param.firstModReg = 10;
    param.secondModReg = 0xD6;
    param.parity = USCI_A_UART_NO_PARITY;
    param.msborLsbFirst = USCI_A_UART_LSB_FIRST;
    param.numberofStopBits = USCI_A_UART_ONE_STOP_BIT;
    param.uartMode = USCI_A_UART_ADDRESS_BIT_MULTI_PROCESSOR_MODE;
    param.overSampling = USCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION;
		//---------------------------------------------------
		
		//Initialize USCI_A0 UART
		USCI_A_UART_init(USCI_A0_BASE, &param);
//		if ( STATUS_FAIL == USCI_A_UART_init(USCI_A0_BASE, &param))
//		{
//        return;
//    }
		
		
	//P2.4,5 = USCI_A0 TXD/RXD
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P2,
        GPIO_PIN4 + GPIO_PIN5
        );
		
	//Enable UART module for operation
    USCI_A_UART_enable(USCI_A0_BASE);
		
	//---------Rx_Interrupt-----------------	
		//Enable Receive Interrupt
		USCI_A_UART_clearInterrupt(USCI_A0_BASE,
        USCI_A_UART_RECEIVE_INTERRUPT
        );
    USCI_A_UART_enableInterrupt(USCI_A0_BASE,
        USCI_A_UART_RECEIVE_INTERRUPT
        );
		//------------------------------------
		
/**********UART 1 --> USCI_A0___________End******************/
		 
		
		
/**********UART 2 --> USCI_A1__________Start*****************/
		
		//-----------BR 9600 @ 4MHz-----------------
		//Baudrate = 9600, clock freq = 4MHz
    //UCBRx = 26, UCBRFx = 10, UCBRSx = 6, UCOS16 = 0
		USCI_A_UART_initParam param2 = {0};
		param2.selectClockSource = USCI_A_UART_CLOCKSOURCE_SMCLK;
    param2.clockPrescalar = 26;
    param2.firstModReg = 10;
    param2.secondModReg = 0xD6;
    param2.parity = USCI_A_UART_NO_PARITY;
    param2.msborLsbFirst = USCI_A_UART_LSB_FIRST;
    param2.numberofStopBits = USCI_A_UART_ONE_STOP_BIT;
    param2.uartMode = USCI_A_UART_ADDRESS_BIT_MULTI_PROCESSOR_MODE;
    param2.overSampling = USCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION;
		//-----------------------------------------
		
		//Initialize USCI_A1 UART
		USCI_A_UART_init(USCI_A1_BASE, &param2);
//		if ( STATUS_FAIL == USCI_A_UART_init(USCI_A1_BASE, &param2))
//		{
//        return;
//    }
			
		//P8.2,3 = USCI_A1 TXD/RXD
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P8,
        GPIO_PIN2 + GPIO_PIN3
        );
		//Enable UART module for operation
    USCI_A_UART_enable(USCI_A1_BASE);
		
		//---------Rx_Interrupt-----------------	
		//Enable Receive Interrupt
		USCI_A_UART_clearInterrupt(USCI_A1_BASE,
        USCI_A_UART_RECEIVE_INTERRUPT
        );
    USCI_A_UART_enableInterrupt(USCI_A1_BASE,
        USCI_A_UART_RECEIVE_INTERRUPT
        );
		//------------------------------------
		
		
/**********UART 2 --> USCI_A1__________End*****************/

}


void Init_IrDA (void)
{
		//P2.4,5 = USCI_A0 TXD/RXD
    GPIO_setAsPeripheralModuleFunctionInputPin(
        GPIO_PORT_P2,
        GPIO_PIN4 + GPIO_PIN5
        );
		
		// Enable IrDA
    UCA0IRCTL |= UCIREN;
		
		// Disable eUSCI_A
    USCI_A_UART_disable(USCI_A0_BASE);                        // Set UCSWRST bit

		// IrDA encoder/decoder enabled
    HWREG16(USCI_A0_BASE + OFS_UCAxIRTCTL) |= UCIREN;
		
		// Transmit pulse clock source BITCLK16 (16 * 1/16 clock fractions)
   // HWREG16(USCI_A1_BASE + OFS_UCAxMCTLW) |= UCOS16;           // Oversampling mode enabled
    HWREG16(USCI_A0_BASE + OFS_UCAxIRTCTL) |= UCIRTXCLK;       // Select BITCLK16

	
		// Transmit pulse length 3/16 bit period (6 half clock cycles)
    // Set UCIRTXPLx to 5
    HWREG16(USCI_A0_BASE + OFS_UCAxIRTCTL) |= UCIRTXPL2 | UCIRTXPL0;    // b101

		//----------BR 9600 @ 4MHz---------------------------
    //Baudrate = 9600, clock freq = 4MHz
    //UCBRx = 26, UCBRFx = 10, UCBRSx = 6, UCOS16 = 1
    USCI_A_UART_initParam param = {0};
    param.selectClockSource = USCI_A_UART_CLOCKSOURCE_SMCLK;
    param.clockPrescalar = 26;
    param.firstModReg = 10;
    param.secondModReg = 0xD6;
    param.parity = USCI_A_UART_NO_PARITY;
    param.msborLsbFirst = USCI_A_UART_LSB_FIRST;
    param.numberofStopBits = USCI_A_UART_ONE_STOP_BIT;
    param.uartMode = USCI_A_UART_ADDRESS_BIT_MULTI_PROCESSOR_MODE;
    param.overSampling = USCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION;
		//---------------------------------------------------
		
		//Initialize USCI_A0 UART
		USCI_A_UART_init(USCI_A0_BASE, &param);
//		if ( STATUS_FAIL == USCI_A_UART_init(USCI_A0_BASE, &param))
//		{
//        return;
//    }

		// Enable eUSCI_A
    USCI_A_UART_enable(USCI_A0_BASE);                         // Clear UCSWRST bit
		
		//---------Rx_Interrupt-----------------	
		//Enable Receive Interrupt
		USCI_A_UART_clearInterrupt(USCI_A0_BASE,
        USCI_A_UART_RECEIVE_INTERRUPT
        );
    USCI_A_UART_enableInterrupt(USCI_A0_BASE,
        USCI_A_UART_RECEIVE_INTERRUPT
        );
		
}


//******************************************************************************
//
//This is the USCI_A0 interrupt vector service routine.
//
//******************************************************************************

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(USCI_A0_VECTOR)))
#endif
void USCI_A0_ISR (void)
{
    switch (__even_in_range(UCA0IV,4)){
        //Vector 2 - RXIFG
        case 2:

            //Receive the data
            receivedData = USCI_A_UART_receiveData(USCI_A0_BASE);

            //Send data back "echo"
            USCI_A_UART_transmitData(USCI_A0_BASE,
            receivedData
            );

            break;
        default: break;
    }
}


//******************************************************************************
//
//This is the USCI_A1 interrupt vector service routine.
//
//******************************************************************************

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A1_VECTOR
__interrupt
#elif defined(__GNUC__)
__attribute__((interrupt(USCI_A1_VECTOR)))
#endif
void USCI_A1_ISR (void)
{
    switch (__even_in_range(UCA1IV,4)){
        //Vector 2 - RXIFG
        case 2:

            //Receive the data
            receivedData = USCI_A_UART_receiveData(USCI_A1_BASE);

            //Send data back "echo"
            USCI_A_UART_transmitData(USCI_A1_BASE,
            receivedData
            );

            break;
        default: break;
    }
}