fet440_uart01_02400（2400时可以直接进入低功耗模式了）.c

基于MSP430F447的串口控制程序包

//******************************************************************************
//  MSP-FET430P440 Demo - USART0, 2400 UART Ultra-low Pwr Echo ISR, 32kHz ACLK
//
//  Description: Echo a received character, RX ISR used. In the Mainloop UART0
//  is made ready to receive one character with interrupt active. The Mainloop
//  waits in LPM3. The UART0 ISR forces the Mainloop to exit LPM3 after
//  receiving one character which echo's back the received character.
//  Baud rate divider with 32768Hz XTAL @2400 = 32768/2400 = ~13.65 (00Dh|6Bh)
//  ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
//  //* An external watch crystal between XIN & XOUT is required for ACLK *//	
//
//                MSP430F449
//             -----------------
//         /|\|              XIN|-
//          | |                 | 32kHz
//          --|RST          XOUT|-
//            |                 |
//            |             P2.4|----------->
//            |                 | 2400 - 8N1
//            |             P2.5|<-----------
//
//
//  M. Buccini
//  Texas Instruments Inc.
//  Feb 2005
//  Built with IAR Embedded Workbench Version: 3.21A
//*****************************************************************************
#include <msp430x44x.h>
void uart_config(void);                     //UART初始化设置函数
#define   Num_of_Results   8                //定义用于存放全局变量的数组
static unsigned int Rev_results[Num_of_Results];

void uart_config(void){
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  FLL_CTL0 |= XCAP18PF;                     // Configure load caps
  P2SEL |= 0x30;                            // P2.4,5 引脚为串口通信脚
  P2DIR |= 0xd0;                            // P2.4,P2.6,P2.7设置为输出模式
  //P2OUT &= ~0x80;                         // 芯片供电撤消，供电结束
  P2OUT |= 0x80;                            // 芯片供电
  P2OUT &= ~0x40;                           // 允许接收
  
  ME1 |= UTXE0 + URXE0;                     // Enable USART0 TXD/RXD
  UCTL0 |= CHAR;                            // 8位传送模式
  UTCTL0 |= SSEL0;                          // UCLK = ACLK
  UBR00 = 0x0D;                             // 32k/2400 - 13.65
  UBR10 = 0x00;
  UMCTL0 = 0x6B;                             
  UCTL0 &= ~SWRST;                          // Initialize USART state machine
  IE1 |= URXIE0;                            // 允许中断
}

void main(void)
{
  uart_config();
  _BIS_SR(LPM3_bits + GIE);                 // Enter LPM3 w/ interrupt
}

// UART0 RX ISR will for exit from LPM3 in Mainloop
#pragma vector=UART0RX_VECTOR
__interrupt void usart0_rx (void)
{
  static unsigned int index = 0;
  Rev_results[index] = RXBUF0;              // RXBUF0 to TXBUF0
  index = (index+1)%Num_of_Results;         // Increment results index, modulo
  _NOP();                                   // SET BREAKPOINT HERE
}