#include <msp430x20x3.h>
#include "intrinsics.h"

// Prototypes
void init_spi(void);
void init_clocking(void);
void send_data(char data);
//EOF Prototypes

void main(void)
{
    WDTCTL = WDTPW + WDTHOLD;
      init_spi();
         init_clocking(void);
      __enable_interrupt();
      int i;
        while(1){
          send_data(0xAA);
          for(i=0;i<10000;i++);
        }
}


void init_spi(void){
  USICTL0 = USIPE7 +  USIPE6 + USIPE5 + USIMST + USIOE + USISWRST; // Port, SPI master
// USICTL1 |= USIIE;                     // Counter interrupt, flag remains set
  USICKCTL = USIDIV_7 + USISSEL_2;      // /128 SMCLK
  USICTL0 &= ~USISWRST;
}

void init_clocking(void){
    /* Use the VLOCLK oscillator. This is important. If we leave the unused 32kHz
    oscillator running, its pins will not be free for sensing. */
    BCSCTL3 = LFXT1S_2;
    BCSCTL1 = CALBC1_16MHZ;               /* Set the DCO speed */
    DCOCTL = CALDCO_16MHZ;
    /* We must turn off the low frequency crystal oscillator, as we are using its pins as I/O pins */
    _BIS_SR(OSCOFF);
    return;
}

void send_data(char data){
    USISRL = data;
    USICNT = 8;
    while(!(USICTL1 & USIIFG));  
    return;
}

#include "msp430xG46x.h"
#include "intrinsics.h"

#define ARROWS LCDM11
#define UP 0x10
#define DOWN 0x40

void init_LCD(void);
void init_SPI(void);
__interrupt void SPI_int(void);

char SPI_ARROW;

int main( void )
{
  // Stop watchdog timer to prevent time out reset
  WDTCTL = WDTPW + WDTHOLD;
  SCFQCTL = SCFQ_4M;
  SCFI0 = 0x08;
  FLL_CTL1 |= SELS;
  
  
  init_LCD();
  init_SPI();
  ARROWS = DOWN; //Test
  __enable_interrupt();
  while(1);
}

void init_LCD(void){//Сюда можно не смотреть, это вывод на LCD
  /*Enable peripherial port functionality*/
  P5SEL = BIT2 + BIT3 + BIT4;
  P5DIR = BIT2 + BIT3 + BIT4;

  LCDACTL |= LCDFREQ1;

  LCDACTL |= LCDFREQ0;
  /*4x MUX*/
  LCDACTL|=LCDMX1;
  LCDACTL|=LCDMX0;
  /*LCD segments enabled*/
  LCDACTL|=LCDSON;
  /*Turn LCD on*/
  LCDACTL|=LCDON;
  /*Enable arrows*/
  LCDAPCTL1 = 0x00;
  LCDAPCTL0 = LCDS20;
  /*Charge pump voltage select*/
  LCDAVCTL1 = VLCD0; //2.6V
  LCDAVCTL0 = LCDCPEN;
  LCDM12 = 0x00;
  return;
}

void init_SPI(void){
  //slave SPI
  P3SEL = 0x0E;      // P3.3,2,1 option select
  UCB0CTL1 = UCSWRST;                       // **Put state machine in reset**
  UCB0CTL0 = UCSYNC+UCMSB;          // 3-pin, 8-bit SPI master
  UCB0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**
  IE2 |= UCB0RXIE;                          // Enable USCI_B0 RX interrupt
}

#pragma vector = USCIAB0RX_VECTOR
__interrupt void SPI_int(void){
  SPI_ARROW = UCB0RXBUF;
  ARROWS = 0;
  if(SPI_ARROW == 0x00)
    ARROWS = UP;
  else
    ARROWS = DOWN;
  //Clear interrupt flag
  //IFG2&=~UCB0RXIFG;
  return;
}

P3SEL = BIT1| BIT2 | BIT3; //P3.1 - P3.3 - 3-wire SPI, MASTER mode

P3DIR = BIT1 | BIT3; //P3.1, P3.3 - output, P3.2 - input