//******************************************************************************
//  MSP-FET430 Flash monitor demonstration. Based on fet140_uart15_9600
//
//  Description: Echo a received character, RX ISR used. Normal mode is LPM3,
//  USART1 RX interrupt triggers TX Echo.
//  When a ^C character is received, control is returned to the monitor program.
//  The LED on P1.0 is toggled periodically to indicate that the program
//  is running.
//
//  ACLK = TACLK = BRCLK = 32kHz, MCLK = SMCLK = default DCO ~750kHz
//  //* An external watch crystal on XIN XOUT is required for ACLK *//
//
//                MSP430F169
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//           |             P3.6|----------->
//           |                 | 9600 - 8N1
//           |             P3.7|<-----------
//           |                 |
//           |             P1.0|--> LED
//
//
//  Jim Patterson
//  Texas Instruments Inc.
//  Oct 2006
//  Built with IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430x16x.h"

void uart1_puts(char out_string[]);

// This places a 16-bit password in flash just above the application
// See the application note for more information on this password feature
__root const int Password @ 0xFBDE = 0xdeaf;

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  P3SEL |= 0xC0;                            // P3.6,7 = USART1 TXD/RXD
  ME2 |= UTXE1 + URXE1;                     // Enable USART1 TXD/RXD
  UCTL1 |= CHAR;                            // 8-bit character
  UTCTL1 |= SSEL0;                          // UCLK = ACLK
  UBR01 = 0x03;                             // 32k/9600 - 3.41
  UBR11 = 0x00;                             //
  UMCTL1 = 0x4A;                            // Modulation
  UCTL1 &= ~SWRST;                          // Initialize USART state machine

  P1DIR |= BIT0;                            // P1.0 output

  TACTL = TASSEL_1 + MC_2 + TAIE;           // ACLK, contmode, interrupt

  IE2 |= URXIE1;                            // Enable USART1 RX interrupt

  // Send out a welcome message
  uart1_puts("\rMSP430 Flash Monitor Demonstration Application\r\n");
  uart1_puts("Echoes UART input to output.\r\nType ^C to return to monitor.\r\n");

  _BIS_SR(LPM3_bits + GIE);                 // Enter LPM0 w/ interrupt
}

void uart1_puts(char out_string[])
{
  int i;
  i=0;
  while( out_string[i] != 0)
  {
    while (!(IFG2 & UTXIFG1));                // USART1 TX buffer ready?
    TXBUF1 = out_string[i++];
  }
}

#pragma vector=UART1RX_VECTOR
__interrupt void usart1_rx (void)
{
  if( RXBUF1 == 0x03 )
    asm(" mov &0xFC40, PC;");                 // ^C starts monitor
  else
  {
    while (!(IFG2 & UTXIFG1));                // USART1 TX buffer ready?
    TXBUF1 = RXBUF1;                          // RXBUF1 to TXBUF1
  }
}

#pragma vector=TIMERA1_VECTOR
__interrupt void Timer_A(void)
{
  switch (__even_in_range(TAIV, 10))        // Efficient switch-implementation
  {
    case  2:  break;                        // CCR1 not used
    case  4:  break;                        // CCR2 not used
    case 10:  P1OUT ^= 0x01;                // Overflow - toggle LED on P1.0
              break;
  }
}