帮忙看看程序有什么问题，用protuse仿真串口接收不到信息 -

#include <iom32v.h>
#include <macros.h>
#define uchar unsigned char
#define uint unsigned int
#define CR 0x0D
#define LF 0x0A
#define H_Bit(val, bitn) (val |=(1<<(bitn))) // bitn位置1
#define L_Bit(val, bitn) (val&=~(1<<(bitn))) // bitn位置0
#define G_Bit(val, bitn) (val &(1<<(bitn)) ) //取bitn的值
#define time_bps() {while(!flag_bps);flag_bps=0;} //波特率延时
uchar bit_c=0; //数码管位选
uchar bit_data[3]; //数码管（四）显示数据
uchar Dp_flag_L=0; //精确0.01小数点
uchar Dp_flag_H=0; //精确0.1小数点
uchar Dp_flag_D=0; //调试功能小数点
uchar Dp_flag=0; //数码管小数点总标志位
uint counter=0;
uint counter_2ms=0;
uint counter_20ms=0;
int k=0;
uchar const show[]={0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x40,0x80,0x00,0x3F,0x06,
0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x80,
// C H
0x39,0x76 };//对应ACSII码
volatile uchar RXD_Data[8]={0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};//用于接收长度为8的数据
volatile uchar RUDR; //接收数据暂存
volatile uchar z=0; //接收探头信息计位
uchar TUDR=0; //模拟IO发送数据缓存区 //UDR
volatile uchar flag_bps=0; //104us标志位
#define MK_RXD PINA1 // 模拟RXD
#define MK_TXD PIND3 // 模拟TXD
/*************************/
uchar IO_UART_RXD(void) //接收
{
uchar i=0x00;
uchar RUDR=0x00;
while(G_Bit(PORTA,MK_RXD));
time_bps(); //延时104US
while(i<8)
{
RUDR>>=1;
if(G_Bit(PORTA,MK_RXD))
{
RUDR|=0x80;
}
i++;
time_bps();
}
while(!G_Bit(PORTA,MK_RXD));//接收完8位信息
time_bps();
return RUDR;
}
void rx_com(uchar IO_UART_RXD)
{
if(IO_UART_RXD==0x0D||IO_UART_RXD==0x0A||k>0) //接收的信息是否为回车或者换行，是则置零
{
k++;
if(IO_UART_RXD>=0x30&&IO_UART_RXD<=0x39||IO_UART_RXD==0x2E)
{
RXD_Data[z]=IO_UART_RXD;
z++;
if(z=9)
{
z=0;
k=0;
}
}
}
}
void IO_UART_TXD(uchar TXD_Data) //发送
{
uchar j;
uchar TUDR; //发送缓冲寄存器
TUDR=TXD_Data;
L_Bit(PORTD,MK_TXD);//发送起始位START
time_bps();
while(j<8)
{
if(TUDR & 0x01) //取0x01位的值,先发送低位
{
H_Bit(TUDR,MK_TXD);
}
else
{
L_Bit(TUDR,MK_TXD);
}
TUDR>>=1;
j++;
time_bps();
}
H_Bit(PORTD,MK_TXD);//发送STOP信号
time_bps();
}
void LED_bit()
{
bit_c++;
bit_c &= 0x03; //0000 0011
PORTC &= ~0xFF; //0000 0000
switch(bit_c)
{
case 0x00:
PORTB&=0xF0; //1
PORTB|=0x07; //0000 0111
break;
case 0x01:
PORTB&=0xF0; //2
PORTB|=0x0B; //0000 1011
break;
case 0x02:
PORTB&=0xF0; //3
PORTB|=0x0D; //0000 1101
break;
case 0x03:
PORTB&=0xF0; //4
PORTB|=0x0E; //0000 1110
break;
default:
break;
}
PORTC = show[bit_data[bit_c]];
if(!Dp_flag)
{
if((Dp_flag_D==1)&&(bit_c==0x03)) //4
PORTC |= 0x80;
else if((Dp_flag_L==1)&&(bit_c==0x02)) //3
PORTC |= 0x80;
else if((Dp_flag_H==1)&&(bit_c==0x01)) //2
PORTC |= 0x80;
else PORTC &= ~0x80;
}
}
void Display() //显示接收信息
{
Dp_flag=1; //小数点标志位开
if(RXD_Data[0]) //显示百位，精确0.1 //j=0,1,2,3,4,5分别为百位十位个位
//小数点 0.1位 0.01位
{ Dp_flag_H=1;
bit_data[0]=RXD_Data[0];
bit_data[1]=RXD_Data[1];
bit_data[2]=RXD_Data[2];
bit_data[3]=RXD_Data[4];
}
else //显示十位，精确0.01
{
Dp_flag_L=1;
bit_data[0]=RXD_Data[1];
bit_data[1]=RXD_Data[2];
bit_data[2]=RXD_Data[4];
bit_data[3]=RXD_Data[5];
}
}
void port_init(void)
{
PORTA = 0x00; // PORTA口初始化
DDRA = 0xC1; //1100 0000 指示灯置位输出 MK_RXD PA1=0
PORTB = 0xFF; // PORTB口初始化
DDRB = 0xFF; //1111 1111
PORTC = 0x00; //PORTC口初始化
DDRC = 0xFF; //11111111 数码管置位输出
PORTD = 0x04; // 0000 0100 PORTD口初始化
DDRD = 0xBA; //1011 1010 //MK_TXD PD3=1/声光报警 PD4=1
}
void timer0_init(void) //定时器0
{
TCCR0 = 0x00;
TCNT0 = 0x98;
TCCR0 = 0x02;
}
void init_devices(void)
{
CLI();
port_init();
timer0_init();
MCUCR = 0x00;
GICR = 0x00;
TIMSK = 0x01;
SEI();
}
#pragma interrupt_handler timer0_ovf_isr:iv_TIM0_OVF
void timer0_ovf_isr(void)
{
#asm("cli") //关全局中断
TCNT0=0x98;
#asm("sei") //开全局中断
flag_bps=1; // 波特率计时标志位
if(++counter_2ms>=20) //每2ms刷新一次数码管
{
LED_bit();
counter_2ms=0;
counter_20ms++;
}
}
void main(void)
{
init_devices();
while(1);
}

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