#include <msp430fr6989.h>

//GPIO definitions
#define CSBdefinition P1SEL1 |= BIT4         // Configure UCA0STE (slave select)
#define CLKdefinition P1SEL1 |= BIT5         // Configure UCA0CLK
#define SIMOdefinition P2SEL0 |= BIT0        // Configure UCA0SIMO/TXD
//Output configuration
#define DDRP1 P1DIR = 0x78; // 0111 1000
#define DDRP2 P1DIR |= BIT0;
/////////////////////////////////////////
#define RST_0 P1OUT &= ~BIT3
#define RST_1 P1OUT |= BIT3

#define CSB_0 P1OUT &= ~BIT4
#define CSB_1 P1OUT |= BIT4

#define RS_0 P1OUT &= ~BIT6
#define RS_1 P1OUT |= BIT6

#define SI_0 P2OUT &= ~BIT0
#define SI_1 P2OUT |= BIT0

// Global variables
unsigned char text1[] = {"Hi :D           "};
unsigned char text2[] = {"It's done!    "};

unsigned int position;

//**************************
//   MSP430F59xx Demo - eUSCI_A0, SPI 4-Wire Master
//
//   Description: SPI master send data to SPI slave using 4-wire mode.
//   ACLK = 32.768kHz, MCLK = SMCLK = DCO ~1MHz.  BRCLK = ACLK/2
//
//
//                   MSP430FR6989
//                 -----------------
//             /|\|              XIN|-
//              | |                 |  32KHz Crystal
//              --|RST          XOUT|-
//                |                 |
//                |             P2.0|-> Data Out (UCA0SIMO)
//                |                 |
//                |             P1.3|-> RST LCD
//                |             P1.6|-> RS LCD
//                |             P1.5|-> Serial Clock Out (UCA0CLK)
//                |             P1.4|-> Slave Select (UCA0STE)
//                |                 |
//
//   William Goh
//   Texas Instruments Inc.
//   April 2014
//   Built with IAR Embedded Workbench V5.60 & Code Composer Studio V6.0
//**************************

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//Function initialization
void initLCD();
void initSPI();
void display();

void wData(unsigned char d);
void wCommand(unsigned char c);

volatile unsigned char TXData;

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void main(void)
{
   WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog timer
   PM5CTL0 &= ~LOCKLPM5;                   // Disable the GPIO power-on default high-impedance mode to activate

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
  //Pin configuration
   CSBdefinition;                          // Configure UCA0STE (slave select)
   CLKdefinition;                          // Configure UCA0CLK
   SIMOdefinition;                         // Configure UCA0SIMO/TXD
   PJSEL0 |= BIT4 | BIT5;                  // For XT1

   DDRP1;
   DDRP2;

   initSPI();

   initLCD();
   __delay_cycles(50);
   display();
   __delay_cycles(50);

   while(1){

   }

}//main

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void initSPI(void){

    // Configure USCI_A0 for SPI operation
      UCA0CTLW0 = UCSWRST;                      // **Put state machine in reset**

      UCA0CTLW0 |= UCSSEL__SMCLK;               // Choose SMLCK (1MHz)
      UCA0BR0 = 0x04;//4                              // Set prescaler to 8 to get SCLK=125kHz
      UCA0BR1 = 0;
      UCA0MCTLW = 0;
                                                // By default -> 4-pin, 8-bit SPI master
      UCA0CTLW0 |= UCMST;                       // Master mode
      UCA0CTLW0 |= UCSYNC;                      // Synchronous mode
      UCA0CTLW0 |= UCCKPL;                      // Clock polarity high
      UCA0CTLW0 |= UCMSB;                       // MSB first (Most Significant Bit)
      UCA0CTLW0 |= UCMODE_2;                    // 4-pin SPI with UCxSTE active high
      UCA0CTLW0 |= UCSTEM;                      // Generate the enable signal for a 4-wire slave

      UCA0CTLW0 &= ~UCSWRST;                    // **Initialize USCI state machine**

      UCA0IE |= UCTXIE;                         // Enable USCI_A0 TX interrupt
      UCA0IFG &= ~UCTXIFG;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//Initialize the LCD
void initLCD(){

    RST_0;                      //reset
    __delay_cycles(2);
    RST_1;                      //end reset
    __delay_cycles(20);
    wCommand(0x30);         //wake up
    __delay_cycles(2);
    wCommand(0x30);         //wake up
    wCommand(0x30);         //wake up
    wCommand(0x39);         //function set
    wCommand(0x14);         //internal osc frequency
    wCommand(0x56);         //power control
    wCommand(0x6D);         //follower control
    wCommand(0x70);         //contrast
    wCommand(0x0C);         //display on
    wCommand(0x06);         //entry mode
    wCommand(0x01);         //clear
    __delay_cycles(100);
}
void wCommand(unsigned char c){
    CSB_0;                      //CSB active
    RS_0;                       //Command/Instruction
    UCA0TXBUF = c;
    CSB_1;                      //CSB disabled
    __delay_cycles(200);
}
void wData(unsigned char d){
    CSB_0;                      //CSB active
    RS_1;                       //Data
    UCA0TXBUF = d;
    CSB_1;                      //CSB disabled
}
void display(){
    int a;
    wCommand(0x80);
    for(a=0; a<16; a++){
       wData(text1[a]);
    }
    wCommand(0xC0);
    for(a=0; a<16; a++){
        wData(text2[a]);
    }
}