这样子是可以的,没有用到中断口,如果程序外的理事多点就会出问题的,那么需要用到外部中断
#include
#include
#include
#include
#define uint unsigned int
#define uchar unsigned char
//#define REN_485 P21 //为0则可以接受，否则发送
#define TIMER0_ENABLE TL0=TH0; TR0=1;
#define TIMER0_DISABLE TR0=0;
unsigned char S485_SEND_BUFFER[80] ,rev_num;
code unsigned char C51BOX2[3]_at_ 0x43 ;
bit REN_485 ;
//#define F_TM F0
bit F_TM;
uchar time_count;
sbit BT_SND =P1^0;
sbit BT_REC =P3^3;
sbit ACC0= ACC^0;
sbit ACC1= ACC^1;
sbit ACC2= ACC^2;
sbit ACC3= ACC^3;
sbit ACC4= ACC^4;
sbit ACC5= ACC^5;
sbit ACC6= ACC^6;
sbit ACC7= ACC^7;
void IntTimer0() interrupt 1 using 1
{
F_TM=1;
time_count++;
}
//发送一个字符
void PSendChar(uchar inch)
{
uchar ii;
time_count=0;
REN_485=1;
ii=0;
F_TM=0;
BT_SND=0; //start bit
TIMER0_ENABLE; //启动
while(!F_TM);
while(ii<8)
{
if(inch&1)
{
BT_SND=1;
}
else
{
BT_SND=0;
}
F_TM=0;
while(!F_TM);
ii++;
inch>>=1;
}
BT_SND=1;
F_TM=0;
while(!F_TM);
TIMER0_DISABLE; //停止timer
}
//接收一个字符
uchar PGetChar()
{
uchar rch,ii;
TIMER0_ENABLE;
F_TM=0;
ii=0;
rch=0;
while(!F_TM); //等过起始位
while(ii<8)
{
rch>>=1;
if(BT_REC)
{
rch|=0x80;
}
ii++;
F_TM=0;
while(!F_TM);
}
F_TM=0;
while(!F_TM)
{
if(BT_REC)
{
break;
}
}
TIMER0_DISABLE; //停止timer
return rch;
}
//检查是不是有起始位
bit StartBitOn()
{
return (BT_REC==0);
}
void main()
{
uchar gch,i;
TMOD=0x22; //定时器1为工作模式2(8位自动重装)，0为模式2(8位8位自动重装)
PCON=00;
TR0=0; //在发送或接收才开始使用
TF0=0;
TH0=0xA0;
TL0=0xA0;
ET0=1;
EA=1;
rev_num=0 ;
while(1)
{
REN_485=0;
if(StartBitOn())
{
gch=PGetChar();
if (gch>0)
{
S485_SEND_BUFFER[rev_num] = gch ;
rev_num++ ;
}
if (rev_num>= 10 )
{
for (i=0;i<= rev_num;i++)
{
PSendChar(S485_SEND_BUFFER);
S485_SEND_BUFFER=0 ;
}
rev_num =0;
}
}
}
}
请兄弟们解难呀,我用外部中断去处理了,总是收不到数呢,
#include
#include
#include
#include
#define uint unsigned int
#define uchar unsigned char
//#define REN_485 P21 //为0则可以接受，否则发送
#define TIMER0_ENABLE TL0=TH0; TR0=1;
#define TIMER0_DISABLE TR0=0;
unsigned char S485_SEND_BUFFER[80] ,rev_num;
code unsigned char C51BOX2[3]_at_ 0x43 ;
bit REN_485,Rev_falg ;
//#define F_TM F0
bit F_TM;
uchar time_count;
sbit BT_SND =P1^0;
sbit BT_REC =P3^3;
sbit ACC0= ACC^0;
sbit ACC1= ACC^1;
sbit ACC2= ACC^2;
sbit ACC3= ACC^3;
sbit ACC4= ACC^4;
sbit ACC5= ACC^5;
sbit ACC6= ACC^6;
sbit ACC7= ACC^7;
void PGetChar() ;
void PSendChar(uchar inch) ;
void IntTimer0() interrupt 1 using 1
{
F_TM=1;
}
void S485_ini1(void) interrupt 2 using 3
{
EX1=0; //关闭中断口1
Rev_falg =1 ;
BT_REC=0 ;
PGetChar() ;
}
//发送一个字符
void PSendChar(uchar inch)
{
uchar ii;
time_count=0;
rev_num=0 ;
REN_485=1;
ii=0;
F_TM=0;
BT_SND=0; //start bit
TIMER0_ENABLE; //启动
while(!F_TM);
while(ii<8)
{
if(inch&1)
{
BT_SND=1;
}
else
{
BT_SND=0;
}
F_TM=0;
while(!F_TM);
ii++;
inch>>=1;
}
BT_SND=1;
F_TM=0;
while(!F_TM);
TIMER0_DISABLE; //停止timer
}
//接收一个字符
void PGetChar()
{
uchar rch,ii;
//TIMER0_ENABLE;
F_TM=0;
ii=0;
rch=0;
while(!F_TM); //等过起始位
while(ii<8)
{
rch>>=1;
if(BT_REC)
{
rch|=0x80;
}
ii++;
F_TM=0;
while(!F_TM);
}
F_TM=0;
while(!F_TM)
{
if(BT_REC)
{
break;
}
}
TIMER0_DISABLE; //停止timer
S485_SEND_BUFFER[rev_num] = rch;
rev_num++ ;
EX1=1;
}
//检查是不是有起始位
bit StartBitOn()
{
return (BT_REC==0);
}
void main()
{
uchar gch,i;
TMOD=0x22; //定时器1为工作模式2(8位自动重装)，0为模式2(8位8位自动重装)
PCON=00;
TR0=0; //在发送或接收才开始使用
TF0=0;
TH0=0xA0;
TL0=0xA0;
ET0=1;
EX1=1; //开中断口1
EA=1;
rev_num=0 ;
Rev_falg=0 ;
while(1)
{
}
}
怎么办呀
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