ARM7 LPC2132 RS485怎么才能收发数据，求帮忙啊

只看该作者 · 2019-11-26 15:02

程序是给的例程，是不是还需要设置什么啊，RS485接串口助手，什么数据都没有

#include <Lpc213x.H>

#define UART_BPS  9600
#define FPCLK  12000000

typedef unsigned int uint32;
typedef unsigned short uint16;
typedef unsigned char uint8;

void DelayNS(uint32 dly)
{
      uint32 i;
      for(;dly>0;dly--)
      for(i=0;i<50000;i++);
}

void UART1_init(void)
{
      uint16 Fdiv;
      U1LCR=0x83;
      Fdiv=(FPCLK/16)/UART_BPS;
      U1DLM=Fdiv/256;
      U1DLL=Fdiv%256;
      U1LCR=0x03;
}

void UART1_SendByte(uint8 data)
{
      U1THR=data;
      while((U1LSR&0x40)==0);
}

void UART1_SendStr(uint8 const *str)
{
      while(1)
      {
            UART1_SendByte(*str++);
            if(*str=='\0')
break;
      }
}

int main(void)
{
      PINSEL0=0x50000;
      UART1_init();
      while(1)
      {
            UART1_SendStr("welcome!\n");
            DelayNS(100);

}
      return(0);
}