#include <msp430x12x.h>
#define BLANK 0x01
#define XLAT 0x02
#define DCPRG 0x04
#define SCLK 0x08
#define GSCLK 0x10
#define SIN 0x20
#define SOUT 0x40
#define VCPRG 0x80
#define XERR 0x01

//int Dot[] = {0x3F, 0x1F,0x3F, 0x1F,0x3F, 0x1F,0x3F, 0x1F,0x3F, 0x1F,0x3F, 0x1F,0x3F, 0x1F,0x3F, 0x1F};
int Dot[] = {0x23, 0x00,0x00, 0x00,0x00, 0x00,0x00, 0x00,0x00, 0x00,0x00, 0x00,0x00,0x00,0x00,0x00};
//int Dot[] = {0xFF, 0x00,0xFF, 0x00, 0xFF,0x00,0xFF, 0x00,0xFF, 0x00,0xFF, 0x00,0xFF,0x00, 0xFF,0x00};
int Gs [] = {0xF23,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
//int Gs [] = {0x0FFF,0x07FF,0x0FFF,0x07FF,0x0FFF,0x07FF,0x0FFF,0x07FF,0x0FFF,0x07FF,0x0FFF,0x07FF,0x0FFF,0x07FF,0x0FFF,0x07FF};

int dcdata; // dot correction data variable
int bdata;  // shiftout variable
int gsdata; // grayscale data variable

void SHIFTOUT_1() // shiftout dot correction data
{
  int a = 5;
  while(a >= 0)
  {
    bdata = dcdata & (1<<a);


    if (bdata == 0)
    P1OUT &= ~SIN; // SIN = 0

    else
    P1OUT |= SIN;  // SIN = 1

    P1OUT |= SCLK ; // Clock = 1
    P1OUT &= ~SCLK ; // Clock = 0

    a--;
  }
}

void SHIFTOUT_2() // shiftout grayscale data
{
  int a = 11;
  while(a >= 0)
  {
    bdata = gsdata & (1<<a);

    if (bdata == 0)
    P1OUT &= ~SIN; // SIN = 0

    else
    P1OUT |= SIN;  // SIN = 1

    P1OUT |= SCLK; // Clock = 1
    P1OUT &= ~SCLK; // Clock = 0
    a--;
  }
}

void GSOUT()
{
  int i = 0;
  while(i <=15)
  {
    gsdata = Gs[i];
    SHIFTOUT_2();
    i++;
  }


  P1OUT |= XLAT;//set the I/O pin for XLATCH high to latch

  P1OUT &= ~XLAT;//set XLATCH back to zero
  P1OUT |= SCLK; //set the I/O pin for SLCK high to
  //give SCLK one extra pulse after XLATCH
  //this is only required if the previous data sent
  //to the TLC5941 was dot correction information
  P1OUT &= ~SCLK;//set I/O pin for SCLK back to zero

}//grayscal data

void DCOUT()
{
  int i = 0;
P1OUT |= VCPRG; //set I/O to enter DC mode

  while(i <= 15)//Loop through 16 LEDs.
   {
    dcdata = Dot[i];
    SHIFTOUT_1();
    i++;
   }//dot correction data

  P1OUT |= XLAT;//set the I/O pin for XLATCH high to latch
  P1OUT &= ~XLAT;//set XLATCH back to zero
  P1OUT &= ~VCPRG;//set the I/O line
}

void main(void)
{

  WDTCTL = WDTPW +WDTHOLD; // Stop Watchdog Timer
  P1DIR = 0xBF; //make all port one GPIO pins outputs, pin 0x04 is for SOUT
  P1SEL |= 0x10;//p1.4 = peripheral module output for GSCLK signal.
  P1OUT = 0x00;//Initialize all outputs to zero
  _DINT();//Turn all interrupts off
  P1OUT |= DCPRG;
  CCTL0 = OUTMOD_3+CCIE;//CCR1 toggle/set
  CCR0 = 4097;//load timer value
  TACTL = TASSEL_2+MC_1;//SMCLK, up mode
  __bis_SR_register(__SR_GIE);//enable timer interrupt for BLANK signal
  DCOUT();//call routine to move dot correction
  GSOUT();//call routine to move grayscale

  while(1)
   {
   }
}

#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
  P1OUT |= BLANK;
  P1OUT &= ~BLANK;
}