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关于使用两片ATMEGA128实现UART单线半双工通信

2013-1-22 16:11:36 7787

0 备使用128做双机通信，使用半双工模式，电路原理图如图所示单片机1的TXD 和RXD与单片机2的TXD和RXD分别用继电器切换，传输使用一条信道，我编的程序总是有问题，求大神指点··· 这是单片机一的程序： #include #include #define uchar unsigned char #define uint unsigned int #define data_1602_DDR DDRA #define data_1602_PORT PORTA #define control_1602_DDR DDRB #define control_1602_PORT PORTB #define CON_DDR DDRF #define CON_PORT PORTF #pragma interrupt_handler ADD:2 #pragma interrupt_handler UART_receive:19 #pragma interrupt_handler UART_transmit0:21 uchar flag=0,rdata,tdata=0; //************************************* void init_1602() { data_1602_DDR=0XFF; control_1602_DDR=0XFF; control_1602_PORT&=~BIT(2); write_com(0x38); delay(5); write_com(0x01); delay(5); write_com(0x0c); delay(5); write_com(0x06); delay(5); } //************************************ void write_dat(uchar dat) { control_1602_PORT\|=BIT(0); control_1602_PORT&=~BIT(1); data_1602_PORT=dat; control_1602_PORT\|=BIT(2); delay(1); control_1602_PORT&=~BIT(2); } //********************************* void write_com(uchar com) { control_1602_PORT&=~BIT(0); control_1602_PORT&=~BIT(1); data_1602_PORT=com; control_1602_PORT\|=BIT(2); delay(1); control_1602_PORT&=~BIT(2); } //********************************* void show_1602(uint x) { uchar table1[]="receive:"; uchar ASCII[]={48,49,50,51,52,53,54,55,56,57,114,115,47,46,32,118,100,66};//0 1 2 3 4 5 6 7 8 9 r s . / uchar m1,n1,m2,n2,k; write_com(0x80+0x01); delay(5); for(n1=0;n1<8;n1++) { write_dat(table1[n1]); delay(1); } write_com(0x80+0x09); delay(5); write_dat(ASCII[x]); delay(1); } //*********************************** void delay(uint ms) { uint i,j; for(i=0;i { for(j=0;j<1141;j++); } } //************************************ void UART_init() { UCSR0B=0X00; UCSR0A=0X00;//控制和状态寄存器清零 UCSR0B=(1< UCSR0C=(1< UBRR0H=0; UBRR0L=51;//设置波特率为9600 DDRE\|=BIT(1);//PE1口输出即TXD0为输出 DDRE&=~BIT(0);//PE0口输入即RXD0为输入 SEI();//开全局中断 } //******************************* void UART_transmit(uchar data)//发送数据 { while(!(UCSR0A&(1< UDR0=data;//将数据放入缓冲期，发送数据 while(!(UCSR0A&(1< UCSR0A\|=BIT(TXC0);//对TXC0位写1，清除标志 } //******************************* void UART_receive()//接收结束中断 { UCSR0B&=~BIT(RXCIE0); flag=1; CON_PORT\|=BIT(0); rdata=UDR0; UCSR0B\|=BIT(RXCIE0); } void UART_transmit0()//发送结束中断 { UCSR0B&=~BIT(TXCIE0); UDR0=0; CON_PORT&=~BIT(0); UCSR0B\|=BIT(TXCIE0); } //******************************* void ADD() { tdata=tdata+1; if(tdata==10) { tdata=0; } } //******************************* int main(void) { CON_DDR\|=BIT(0); CON_PORT&=~BIT(0); DDRD&=~BIT(0); EIMSK\|=BIT(0); EICRA=0X00; SEI(); init_1602(); UART_init(); while(1) { UART_transmit(tdata); if(flag==1) { flag=0; }show_1602(rdata); } } 单片机2的程序： #include #include #define uchar unsigned char #define uint unsigned int #define data_1602_DDR DDRA #define data_1602_PORT PORTA #define control_1602_DDR DDRB #define control_1602_PORT PORTB #define CON_DDR DDRF #define CON_PORT PORTF #pragma interrupt_handler ADD:2 #pragma interrupt_handler UART_receive:19 #pragma interrupt_handler UART_transmit0:21 uchar flag=0,rdata,tdata=0,flag1=0; //*********************************** void init_1602() { data_1602_DDR=0XFF; control_1602_DDR=0XFF; control_1602_PORT&=~BIT(2); write_com(0x38); delay(5); write_com(0x01); delay(5); write_com(0x0c); delay(5); write_com(0x06); delay(5); } //************************************ void write_dat(uchar dat) { control_1602_PORT\|=BIT(0); control_1602_PORT&=~BIT(1); data_1602_PORT=dat; control_1602_PORT\|=BIT(2); delay(1); control_1602_PORT&=~BIT(2); } //********************************* void write_com(uchar com) { control_1602_PORT&=~BIT(0); control_1602_PORT&=~BIT(1); data_1602_PORT=com; control_1602_PORT\|=BIT(2); delay(1); control_1602_PORT&=~BIT(2); } //********************************* void show_1602(uint x) { uchar table1[]="receive:"; uchar ASCII[]={48,49,50,51,52,53,54,55,56,57,114,115,47,46,32,118,100,66};//0 1 2 3 4 5 6 7 8 9 r s . / uchar m1,n1,m2,n2,k; write_com(0x80+0x01); delay(5); for(n1=0;n1<8;n1++) { write_dat(table1[n1]); delay(1); } write_com(0x80+0x09); delay(5); write_dat(ASCII[x]); delay(1); } //*********************************** void delay(uint ms) { uint i,j; for(i=0;i { for(j=0;j<1141;j++); } } //************************************ void UART_init() { UCSR0B=0X00; UCSR0A=0X00;//控制和状态寄存器清零 UCSR0B=(1< UCSR0C=(1< UBRR0H=0; UBRR0L=51;//设置波特率为9600 DDRE\|=BIT(1);//PE1口输出即TXD0为输出 DDRE&=~BIT(0);//PE0口输入即RXD0为输入 SEI();//开全局中断 } //******************************* void UART_transmit(uchar data) { while(!(UCSR0A&(1< UDR0=data;//将数据放入缓冲期，发送数据 while(!(UCSR0A&(1< UCSR0A\|=BIT(TXC0);//对TXC0位写1，清除标志 UDR0=0; } //******************************* void UART_receive() { UCSR0B&=~BIT(RXCIE0); flag=1; CON_PORT&=~BIT(0); rdata=UDR0; UCSR0B\|=BIT(RXCIE0); } void UART_transmit0() { UCSR0B&=~BIT(TXCIE0); CON_PORT\|=BIT(0); UDR0=0; UCSR0B\|=BIT(TXCIE0); } //******************************* void ADD() { tdata=tdata+1; if(tdata==10) { tdata=0; } } //********************************* int main(void) { CON_DDR\|=BIT(0); CON_PORT&=~BIT(0); DDRD&=~BIT(0); EIMSK\|=BIT(0); EICRA=0X00; SEI(); init_1602(); UART_init(); while(1) { UART_transmit(tdata); if(flag==1) { flag=0; show_1602(rdata); } } } 求大神指点啊···如何实现单线半双工 0
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