msp430f449的RS232接口程序 -

#include"MSP430x44x.h"

voidinit_UART(void);
voiduart_start(void);
voiduart_send(void);
voiduart_receive(void);

unsignedcharRXDATA_BUF[10],TXDATA_BUF[10]={0xbd,0x77,0x3d,0xc5,0xc6,0xf5,0x68,0x0d,0x6b,0xff};

本文引用地址: http://www.21ic.com/app/mcu/201806/761586.htm

unsignedintRX_count=0,TX_count=0,TXBUF_num=10,RXBUT_num=10,FLAG;

voidmain(void)
{init_uart();
uart_start();
while(1)
{_BIS_SR(CPUOFF);
_NOP();
}
}

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voidinit_uart(void)//初始化UART
{unsignedinti;
WDTCTL=WDTPW+WDTHOLD;
FLL_CTL1|=XT2OFF+SELM_XT2+SELS;//选择MCLK时钟源
do//等待时钟稳定
{IFG1&=~OFIFG;
for(i=0;i<0xff;i++);
}while((FLL_CTL0&XT2OF)==XT2OF);
UCTL0|=SWRST;//控制寄存器位
UCTL0|=CHAR;
UTCTL0=SSEL0+SSEL1;//选择发送时钟源复位
UBR00=0XA0;//波特率9600
UBR10=0X01;
UMCTL0=0X5E;
UCTL0&=~SWRST;//选择发送时钟源置位
ME1|=URXE0+UTXE0;//使能TXDRXD
IE1|=URXIE0;
IFG1=0X00;
P2SEL|=0X30;//模块选用
P2DIR|=0X10;
for(i=0;i<10;i++){RXDATA_BUF=0;}//清接收缓存
_EINT();
}

---------------------------------------------------------
voiduart_start(void)//启动发送
{IE1|=UTXIE0;
while((UTCTL0&BIT0)!=BIT0);
TXBUF0=TXDATA_BUF[0];
TX_count=1;
}

----------------------------------------------------------
voiduart_receive(void)//接收
{RXDATA_BUF[RX_count]=RXBUF0;
RX_count+=1;
if(RX_count>=RXBUT_num){RX_count=0;}
}
-----------------------------------------------------------
voiduart_send(void)//发送
{TXBUF_num-=1;
if(TXBUF_num>0)
{TXBUF0=TXDATA_BUF[TX_count];
TX_count+=1;

}
else
{FLAG+=1;
if(FLAG>10){IE1&=~UTXIE0;}
else{TXBUF_num=10;
TX_count=0;
uart_start();
}

}
}
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interrupt[UART0TX_VECTOR]voiduart_tx(void)//发送中断响应
{
uart_send();
}

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interrupt[UART0RX_VECTOR]voiduart_rx(void)//接收中断响应
{
uart_receive();
}