//******************************************************************************
//  MSP-430-Day II Demo - DMA0 Repeated Block UART0 9600 TX, TACCR2, ACLK
//
//  Description; DMA0 is used to transfer a string byte-by-byte as a repeating
//  block to U0TXBUF. Timer_A operates continuously at 32768Hz with CCR2IFG 
//  triggering DMA0. String is TX'd via 9600 baud UART0.
//  ACLK = LFXT1 = UCLK0 = 32768, MCLK = SMCLK = DCO = 32xACLK = 1.048576MHz
//  //*External watch crystal on XIN XOUT is required for ACLK*//	  
//
//
//           MSP430FG439
//         ---------------
//     /|\|            XIN|-  
//      | |               | 32kHz
//      --|RST        XOUT|-
//        |               |
//        |        Sx,COMx|--> /SBLCDA4 softbaugh LCD/
//        |               |
//        |           P2.4|------------> String Data
//        |               | 9600 - 8N1
//
//  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"
};

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;                     // SBLCDA4 LCD freq 

  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"

  P2SEL = 0x30;                               // P2.4,5 = USART1 TXD/RXD
  ME1 |= UTXE0 + URXE0;                       // Enabled UART0 TXD/RXD
  U0CTL |= CHAR;                              // 8-bit char, SWRST=1
  U0TCTL |= SSEL0;                            // UCLK = ACLK
  U0BR0 = 0x03;                               // 9600 from 32768Hz
  U0BR1 = 0x00;
  U0MCTL = 0x4A;                              // Modulation
  U0CTL &= ~SWRST;                            // Enable USART

  DMACTL0 = DMA0TSEL_1;                       // 0-CCR2IFG
  DMA0SA = (unsigned int)char_gen;            // Source block address
  DMA0DA = U0TXBUF_;                          // Dest single address
  DMA0SZ = sizeof char_gen;                   // Block size
  DMA0CTL = DMADT_4 + DMASRCINCR_3 + DMASBDB + DMAEN;// Rpt, inc src, enable

  TACCR0 = 8192;                              // Char freq = TACLK/CCR0
  TACCR2 = 1;                                 // For DMA0 trigger
  TACTL = TASSEL_1 + MC_1;                    // ACLK, up-mode

  _BIS_SR(LPM3_bits + GIE);                   // Enter LPM3, w/ interrupt
} // main