//******************************************************************************
//  MSP-430-Day II Demo - LPM3 Using BasicTimer ISR, 32kHz ACLK  
//
//  Description: System runs normally in LPM3 with basic timer clocked by 
//  32kHz ACLK. At a 2 second interval the basic timer ISR will wake the 
//  system and flash the LCD controller on/off. 
//  ACLK = LFXT1 = 32768, MCLK = SMCLK = DCO = 32xACLK = 1.048576MHz
//  //*External watch crystal on XIN XOUT is required for ACLK*//	  
//
//
//           MSP430FG439
//         ---------------
//     /|\|            XIN|-  
//      | |               | 32kHz
//      --|RST        XOUT|-
//        |               |
//        |        Sx,COMx|--> /SBLCDAA softbaugh LCD/
//
//  M. Buccini
//  Texas Instruments, Inc
//  February 2004
//  Built with IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include  <msp430xG43x.h>                                    

static char *LCD = LCDMEM;

const char char_gen[] = {
 0xf5,                                            // Displays "0"
 0x60,                                            // Displays "1"
 0xb6,                                            // Displays "2"
 0xf2,                                            // Displays "3"
 0x63,                                            // Displays "4"
 0xd3,                                            // Displays "5"
 0xd7,                                            // Displays "6"
 0x70,                                            // Displays "7"
 0xf7,                                            // Displays "8"
 0xf3,                                            // Displays "9"
 0x77,                                            // Displays "A"
 0x00,                                            // Displays  Blank
 0x95,                                            // Displays "C"
 0x33,                                            // Displays "degrees" o
 0x97,                                            // Displays "E"
 0x17,                                            // Displays "F"   
 0x08,                                            // Displays ":" or "."
 0x02,                                            // Displays "-"
 0x87                                             // Displays "t"                                                        
};

void main(void) {
  int i;
   
    WDTCTL = WDTPW + WDTHOLD;                     // Stop WDT
    FLL_CTL0 |= XCAP18PF;                         // Set load caps
    P1OUT = 0x00;                                 // P1.0 = LED, P1.2 = Sensor GND
    P2OUT = 0x00;
    P3OUT = 0x00;
    P1DIR = 0xFB;
    P2DIR = 0xF9;                                 // P2.1/2 = Push buttons
    P3DIR = 0xFF;
    P6SEL |= 0xFF;                                // P6.x ADC option select 
    P5SEL  = 0xFC;                                // Set Rxx and COM pins for LCD    
    LCDCTL = LCDON + LCD4MUX + LCDSG0_3;          // SBLCDA4 LCD 4Mux, S0-S23
    BTCTL = BT_fLCD_DIV128 + BT_ADLY_2000;        // SBLCDA4 LCD freq, 2 second interrupt 
    IE2 |= BTIE;                                  // Enable Basic Timer interrupt.

  for( i = 0; i < 20; i++){                       //  Clear LCD Display RAM
    LCD[i] = 0;
  } // for

    LCD[1] = char_gen[4];                         // "4"
    LCD[2] = char_gen[3];                         // "3"
    LCD[3] = char_gen[0];                         // "0"

  while (1)                             
  {
    _BIS_SR(LPM3_bits + GIE);                     // Enter LPM3 w/ interrupts
    LCDCTL ^= LCDON;                              // Toggle LCD on/off
  } // while 
} // main

// Basic Timer interrupt service routine
#pragma vector=BASICTIMER_VECTOR
__interrupt void basic_timer(void)
{
   _BIC_SR_IRQ(LPM3_bits);                        // Clear LPM3 bits from 0(SR)
}