pc_control.c

通过本实验学习PC机串口与AVR单片机串口之间相互通讯的基本硬件接口电路和软件编程方法

#include <iom8v.h>
#include <macros.h>
#include "Io_define.h"

//#define fosc 8000000
//#define baud 9600

unsigned char RX_data[4]={0};
unsigned char RX_counter=0;

void UART_init        (void);
void putchar          (unsigned char c); 
void puts             (unsigned char *s);
void UART_rx          (void);
void delay_nms        (unsigned int n);

void putchar(unsigned char c)        //字符输出函数
  {
     while (!(UCSRA&(1 << UDRE)));   //判断上次发送有没有完成
     UDR = c;    
  }

#pragma interrupt_handler UART_rx: iv_USART_RX
void UART_rx(void)
  {
     //static unsigned char RX_counter;
     /*
     if (RX_counter >= 4) 
       {
       	 RX_counter = 0;
       	 if ((!(RX_data[0] == 's'))||(!(RX_data[3] == 'p')))
       	   {
       	      RX_data[0]=0;
              RX_data[1]=0;
              RX_data[2]=0;
              RX_data[3]=0;
       	   }
       }
     */
     RX_data[RX_counter] = UDR;
     //putchar(RX_data[RX_counter]);
     //putchar(RX_counter+0x30);
     //RX_counter++;
     
     if (RX_data[RX_counter]=='s')
       {
       	  RX_data[0]=RX_data[RX_counter];
       	  RX_counter=0;
       }
     RX_counter++;
     if (!(RX_data[3] == 'p'))
       	   {
       	      RX_data[0]=0;
              RX_data[1]=0;
              RX_data[2]=0;
              RX_data[3]=0;
       	   }
  }

void puts(unsigned char *s)
  {
     while (*s)
       {
       	  putchar(*s);
       	  s++;
       }
  }
  
void UART_init(void)
  {
     UCSRB = BIT(RXCIE)| BIT(RXEN) |BIT(TXEN);  //允许串口发送和接收，并响应接收完成中断
     UBRR = 51;
     //UBRRL = (fosc/16/(baud+1))%256;
     //UBRRH = (fosc/16/(baud+1))/256;
     UCSRC = BIT(URSEL)|BIT(UCSZ1)|BIT(UCSZ0);   //8位数据＋1位stop位
  }
  
void main(void)
  {
     
     DDRB  = 0B11111111;
     PORTB = 0B00000000;
     DDRC  = 0B11111111;
     PORTB = 0B00000000;
     DDRD  = 0B11111111;
     PORTB = 0B00000000;

     UART_init();
     SEI();

     while (1)
       {
          if (RX_counter==3)
          {
          	RX_counter=0;
          if ((RX_data[0] == 's')&&(RX_data[3] == 'p'))
          {  
              
          //if ((RX_data[0] == 's')&&(RX_data[1] == 'u')
            //  &&(RX_data[2]=='0')&&(RX_data[3] == 'p'))
              if ((RX_data[1] == 'u') &&(RX_data[2]=='0'))
            {
              puts("upready");
              asm("jmp 0xe00");
            }
          else  
          //if ((RX_data[0] == 's')&&(RX_data[3] == 'p')&&(RX_data[1]=='0'))
          if (RX_data[1]=='0')
            {
              if (RX_data[2]=='0')
                  {
                              //PORTB ^= 0X01;      
                              key0 ^= key0_open;
                              puts("00ok");            
                            } 
              else if (RX_data[2]=='1')
                  {
                              //PORTB ^= 0X01;      
                              key1 ^= key1_open;
                              puts("01ok");            
                            } 
              /*
              switch (RX_data[2])
                {
                  case '0': {
                              //PORTB ^= 0X01;      
                              key0 ^= key0_open;
                              puts("00ok");            
                            }  break;
                  case '1': {
                              key1 ^= key1_open;
                              //PORTB ^= 0X02;
                              puts("01ok"); 
                            }  break;
                  case  50: {
                              key2 ^= key2_open;
                              //PORTB ^= 0X04;
                              puts("02ok"); 
                            }  break;
                  case  51: {
                              key3 ^= key2_open;
                              //PORTB ^= 0x07;                   
                              puts("03ok");  
                            }  break;
                  case  52: {
              	              key4 ^= key4_open;
              	              puts("04ok");  
              	            }  break;
                  case  53: {
              	              key5 ^= key5_open;
              	              puts("05ok");
              	            }  break;
              	  case  54: {
                              key6 ^= key6_open;
                              //PORTB ^= 0X01;      
                              puts("06ok");            
                            }  break;
                  case  55: {
                              key7 ^= key7_open;
                              //PORTB ^= 0X02;
                              puts("07ok"); 
                            }  break;
                  case  56: {
                              key8 ^= key8_open;
                              //PORTB ^= 0X04;
                              puts("08ok"); 
                            }  break;
                  case  57: {
                              key9 ^= key9_open;
                              //PORTB ^= 0x07;                   
                              puts("09ok");  
                            }  break;
                  case  58: {
              	              key10 ^= key10_open;
              	              puts("0:ok");  
              	            }  break;
                  case  59: {
              	              key11 ^= key11_open;
              	              puts("0;ok");
              	            }  break;          
              	  case  60: {
                              key12 ^= key12_open;
                              //PORTB ^= 0X01;      
                              puts("0<ok");            
                            }  break;
                  case  61: {
                              key13 ^= key13_open;
                              //PORTB ^= 0X02;
                              puts("0=ok"); 
                            }  break;
                  case  62: {
                              key14 ^= key14_open;
                              //PORTB ^= 0X04;
                              puts("0>ok"); 
                            }  break;
                  case  63: {
                              key15 ^= key15_open;
                              //PORTB ^= 0x07;                   
                              puts("0?ok");  
                            }  break;
                  case  64: {
              	              key16 ^= key16_open;
              	              puts("0@ok");  
              	            }  break;
                  case  65: {
              	              key17 ^= key17_open;
              	              puts("0Aok");
              	            }  break;
              	  case  66: {
                              key18 ^= key18_open;
                              //PORTB ^= 0X01;      
                              puts("0Bok");            
                            }  break;
                  case  67: {
                              key19 ^= key19_open;
                              //PORTB ^= 0X02;
                              puts("0Cok"); 
                            }  break;
                  case  68: {
                              PORTB ^= 0B11111111;
                              PORTC ^= 0B00111111;
                              PORTD ^= 0B11111100;
                              //PORTB ^= 0X04;
                              puts("0Dok"); 
                            }  break;
                  case  69: {
                              PORTB ^= 0x07;                   
                              puts("0Eok");  
                            }  break;
              	}*/
              RX_data[0]=0;
              RX_data[1]=0;
              RX_data[2]=0;
              RX_data[3]=0;
            }
         }
       }
      }
  }