test44x_uart01_0115k.c

来自「MSP430单片机RS232异步通讯源程序 经验证可以实现通讯」· C语言 代码 · 共 35 行

#include <msp430x44x.h>

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  FLL_CTL0 |= XCAP14PF;                 // Configure load caps
  UTCTL0 = SSEL1;                       // UCLK = SMCLK
  UBR00 = 0x09;                         // 1MHz 115200
  UBR10 = 0x00;                         // 1MHz 115200
  UMCTL0 = 0x0A;                        // modulation
  UCTL0 = CHAR;                         // 8-bit character *SWRST*
  ME1 |= UTXE0 + URXE0;                 // Enable USART0 TXD/RXD
  IE1 |= URXIE0;                        // Enable USART0 RX interrupt
  P2SEL |= 0x30;                        // P2.4,5 = USART0 TXD/RXD
  P2DIR |= 0x10;                        // P2.4 output direction
  _EINT();                              // Enable interrupts

  for (;;)
  {
    _BIS_SR(CPUOFF);                    // Enter LPM0
    _NOP();                             // Required only for C-spy
  }
}

//interrupt[UART0RX_VECTOR] void usart0_rx (void)
#pragma vector=UART0RX_VECTOR
__interrupt void usart0_rx(void)

{
  while ((IFG1 & UTXIFG0) == 0);        // USART0 TX buffer ready?
  TXBUF0 = RXBUF0;                      // RXBUF0 to TXBUF0
}