Lab 4-3 PIC

#include <plib.h>
#pragma config FPLLMUL = MUL_20, FPLLIDIV = DIV_2, FPLLODIV = DIV_1, FWDTEN = OFF
#pragma config POSCMOD = HS, FNOSC = PRIPLL, FPBDIV = DIV_2
#pragma config UPLLEN = ON, UPLLIDIV = DIV_2
#pragma config DEBUG = OFF, ICESEL = ICS_PGx2, CP = OFF, BWP = OFF, PWP = OFF
#pragma FWDTEN = OFF, FCKSM = CSDCMD
/*Definitions ************************************************/
#define SYS_FREQ                (80000000UL)  //  Clock Frequency 80 MHz
#define SYSCLK_UART             (SYS_FREQ/2)  //  Peripheral Bus Clock: 40 MHz
#define Baud2BRG(desired_baud)  ((SYSCLK_UART/(16*desired_baud))-1) // set baud rate
#define FOSC           80E6
#define PB_DIV         2
#define PRESCALE       256
#define MSEC           10E-3
#define T1_TICK       (50 * MSEC * FOSC)/(PB_DIV * PRESCALE) // 1/20kHz = 50us
typedef int bool;
#define true 1
#define false 0
/*function ***************************************************/
int UART2Configure( unsigned int desired_baud );
int SerialTransmit(char *buffer);
void sentButton( UINT32 data );
/*Global Variables *******************************************/
UINT8 buf[1024];
/*Main Function **********************************************/
int main(void)
{
    SYSTEMConfig(SYS_FREQ, SYS_CFG_WAIT_STATES | SYS_CFG_PCACHE);
    mJTAGPortEnable(DEBUG_JTAGPORT_OFF); //Disable JTAG Port
    /*variable *********************************/
    unsigned int CaptureTime;
    bool start    = false;
    int count     = 0;
    UINT32 data   = 0x0;
    int state     = 0;
    /*Setup port I/O ***************************/
    TRISDbits.TRISD1 = 0;   // making pin RD1 as output...pin76
    //Clear interrupt flag
    mIC1ClearIntFlag();
    UART2Configure(250000); // Confugure UART
    // Setup Timer 3
    OpenTimer3(T3_ON | T1_PS_1_256, T1_TICK);
    // Enable Input Capture Module 1
    // - Capture Every Talling edge
    // - Enable capture interrupts
    // - Use Timer 3 source
    // - Capture rising edge first
    OpenCapture1( IC_EVERY_FALL_EDGE | IC_INT_1CAPTURE | IC_TIMER3_SRC | IC_FEDGE_FALL | IC_ON );
    while(1){
        // Wait for Capture events
        while( !mIC1CaptureReady() ) ;
        //Now Read the captured timer value
        while( mIC1CaptureReady() )
        {
            CaptureTime = mIC1ReadCapture();
            WriteTimer3(0);
            //sprintf(buf, "%d\r\n", CaptureTime);
            //SerialTransmit(buf);
            switch( state ){
                case 0:
                    if( CaptureTime >= 283000000 && CaptureTime <= 300000000 ){
                        //SerialTransmit("start\r\n");
                        state = 1;
                    }
                    break;
                case 1:
                    if( CaptureTime >= 360000000 && CaptureTime <= 400000000 ){
                        count++;
                        data = data << 1;
                        //sprintf(buf, "bit:%d\r\n", count);
                        //SerialTransmit(buf);
                    }
                    if( CaptureTime >= 710000000 && CaptureTime <= 750000000 ){
                        count++;
                        data++;
                        data = data << 1;
                        //sprintf(buf, "bit:%d\r\n", count);
                        //SerialTransmit(buf);
                    }
                    if( count == 31 ){
                        state = 0;
                        //sprintf(buf, "data:%d\r\n", data);
                        //SerialTransmit(buf);
                        sentButton( data );
                        data = 0;
                        count = 0;
                    }
                    break;
            } // end - switch case
        } // end - while mIC1CaptureReady()
    } // end - while loop
} // end - main
void sentButton( UINT32 data ){
    UINT32 input = data;
    switch( input ){
        case 0xFF629C:
            sprintf(buf, "Button: UP\r\n");
            SerialTransmit(buf);
            break;
        case 0xFFA856:
            sprintf(buf, "Button: DOWN\r\n");
            SerialTransmit(buf);
            break;
        case 0xFF22DC:
            sprintf(buf, "Button: LEFT\r\n");
            SerialTransmit(buf);
            break;
        case 0xFFC23C:
            sprintf(buf, "Button: RIGHT\r\n");
            SerialTransmit(buf);
            break;
        case 0xFF02FC:
            sprintf(buf, "Button: OK\r\n");
            SerialTransmit(buf);
            break;
        case 0xFF6896:
            sprintf(buf, "Button: %d\r\n", 1);
            SerialTransmit(buf);
            break;
        case 0xFF9866:
            sprintf(buf, "Button: %d\r\n", 2);
            SerialTransmit(buf);
            break;
        case 0xFFB04E:
            sprintf(buf, "Button: %d\r\n", 3);
            SerialTransmit(buf);
            break;
        case 0xFF30CE:
            sprintf(buf, "Button: %d\r\n", 4);
            SerialTransmit(buf);
            break;
        case 0xFF18E6:
            sprintf(buf, "Button: %d\r\n", 5);
            SerialTransmit(buf);
            break;
        case 0xFF7A84:
            sprintf(buf, "Button: %d\r\n", 6);
            SerialTransmit(buf);
            break;
        case 0xFF10EE:
            sprintf(buf, "Button: %d\r\n", 7);
            SerialTransmit(buf);
            break;
        case 0xFF38C6:
            sprintf(buf, "Button: %d\r\n", 8);
            SerialTransmit(buf);
            break;
        case 0xFF5AA4:
            sprintf(buf, "Button: %d\r\n", 9);
            SerialTransmit(buf);
            break;
        case 0xFF4AB4:
            sprintf(buf, "Button: %d\r\n", 0);
            SerialTransmit(buf);
            break;
        case 0xFF42BC:
            sprintf(buf, "Button: *\r\n");
            SerialTransmit(buf);
            break;
        case 0xFF52AC:
            sprintf(buf, "Button: #\r\n");
            SerialTransmit(buf);
            break;
    }
} // end-sentButton
// UART2 CONFIGURE
int UART2Configure( unsigned int desired_baud ){
    U2MODE     = 0;                      // disable autobaud, TX and RX enabled only, 8N1, idle=HIGH
    U2MODESET  = 0x8000;                 // Enable Uart for 8-bit data
                                         // no parity bit, 1 STOP bit
    U2STA      = 0;
    U2STASET   = 0x1400;                 // Enable Transmit and Receive
    U2BRG      = Baud2BRG(desired_baud); // Set Data Rate
                                         // This Project set Data Rate is 250k
    return 0;
} //  END! UART2Configur()
int SerialTransmit(char *buffer){
    unsigned int size = strlen(buffer);
    while( size ){
        while( U2STAbits.UTXBF ); // wait while TX buffer full
        U2TXREG = *buffer;        // send single character to transmit buffer
        buffer++;                 // transmit next character on following loop
        size--;                   // loop until all characters sent (when size = 0)
    }
    while( !U2STAbits.TRMT );     // wait for last transmission to finish
    return 0;
} //  END! SerialTransmit()