串口发送数据串口调试助手显示RX没改变

只看该作者 · 2014-11-27 15:30

#include <msp430.h>
#include<stdio.h>

void USCI_A0_init(void)
{

   DCOCTL = 0; // Select lowest DCOx and MODx settings

   BCSCTL1 = CALBC1_1MHZ; // Set DCO

   DCOCTL = CALDCO_1MHZ;

   P1SEL = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD

   P1SEL2 = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD

   UCA0CTL1 |= UCSSEL_2; // SMCLK

   UCA0BR0 = 104; // 1MHz 9600

   UCA0BR1 = 0; // 1MHz 9600

   UCA0MCTL = UCBRS0; // Modulation UCBRSx = 1

   UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**

   IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt

   __bis_SR_register(LPM0_bits + GIE); // Enter LPM0, interrupts enabled
}

int main(void)

{

  WDTCTL = WDTPW + WDTHOLD; // Stop WDT

  USCI_A0_init();
  unsigned char sbuf[8];       /*待发送的内容*/
  unsigned int vol,curr,index=0;
  while(1)
  {
   sbuf[0] = (unsigned char)0x55; //头部，固定
   sbuf[1] = (unsigned char)((0x80)|(index & (0x3F<<16))); //前两个bit为类型，此处以10B电压源数据为例，后6bit为index前6位
   sbuf[2] = (unsigned char)(index & (0xFF<<8)); //去除头6bit后的一个字节
   sbuf[3] = (unsigned char)(index & 0xFF); //取index最后一个字节

   vol = (unsigned int)(20); //电压，先按固定值20取
   curr = (unsigned int)(30);  //电流，先按固定值30取
   sbuf[4] = (unsigned char)(vol & (0xFF<<4));//电压数据前八bit放入第一个Byte
   sbuf[5] = (unsigned char)(((vol&0xF)<<4)|(curr & (0xF<<8)));//电压数据的后四位和电流数据的前4位
   sbuf[6] = (unsigned char)(curr & 0xFF);//电流数据的后8位
   sbuf[7] = (unsigned char)0xAA;       //尾部

   unsigned int i;
   for(i=0;i<8;i++)
      UartSend(sbuf);
  }
}

#pragma vector=USCIAB0RX_VECTOR

void UartSend(unsigned char c)//发送字节函数
{
while(!(IFG2 & UCA0TXIFG));  //待发送为空
UCA0TXBUF=c;
IFG2 &=~UCA0RXIFG;
}
目前问题：连接串口，串口调试助手里显示的“RX”没有变化；若成功的发送的话不是应该在串口调试助手里看到“RX”增加吗？
求大神指教

只看该作者 · 2014-11-27 15:30

430G2553

串口发送数据串口调试助手显示RX没改变

相关下载

相关帖子