uart0.c

充电车的控制板程序

#include <iom128v.h>
#include <macros.h>
//------------
#define TRE0 5
#define SET_485_TX0() PORTD &= ~(1<<TRE0)
#define SET_485_RX0() PORTD |= (1<<TRE0)
//-----------------
#pragma interrupt_handler uart0_rx_isr:19
#pragma interrupt_handler uart0_udre_isr:20
#pragma interrupt_handler uart0_tx_isr:21

extern void command_handle0(void);


unsigned char rx0_step;
unsigned char tx0_step;

//unsigned char rx0_buf[15];
//unsigned char tx0_buf[15];

unsigned char rx0_buf[14];
unsigned char tx0_buf[14];

unsigned char temp_rx;

unsigned char rx_ok;
unsigned char tx_en;
unsigned char uart0_reset_count;


/*************/
// 接收中断
/*********/
void uart0_rx_isr(void)
	{
	if(rx_ok)return;
		
	uart0_reset_count=2;
	rx0_buf[rx0_step]=UDR0;	
//	if(rx0_step<14)
//	temp_rx=temp_rx+rx0_buf[rx0_step];

	rx0_step++;
//	if(rx0_step>14)
	if(rx0_step>13)
	{
		rx0_step=0;
//		if(temp_rx==rx0_buf[14])
		rx_ok=1;
//		temp_rx=0x00;
	};
	}

/*******/
//寄存器空中断
/***************/
void uart0_udre_isr(void)
	{
//	 if(tx0_step<14)
//	 { 	
	  UDR0=tx0_buf[tx0_step]; 
//	  tx0_buf[14]+=tx0_buf[tx0_step];
	  tx0_step++;
//	 }
//	 else if(tx0_step==14)
   if(tx0_step>13)
	 {
	 	// UDR0=tx0_buf[14];
	 	 tx0_step=0; 	 
	 	 UCSR0B&=~(1<<UDRIE0);
		 UCSR0B|=1<<TXCIE0;	 	 
	 }
	}

/******************/
//发送完成中断
/****************/
void uart0_tx_isr(void)
	{
//	tx0_buf[14]=0x00;
	SET_485_RX0();	
	UCSR0B&=~(1<<TXCIE0);
	UCSR0B|=(1<<RXEN0)|(1<<RXCIE0);//允许接收，接收结束中断
	tx_en=1;
	}
//-------------------
void uart0_init(void)
{
unsigned char i;
 UCSR0B = 0x00; //disable while setting baud rate
 UCSR0A = 0x00;
 UCSR0C = 0x06;
 
 //UBRR0L = 0x33; //set baud rate lo
// UBRR0H = 0x00; //set baud rate hi

 UBRR0L = 0x0C; //
 UBRR0H = 0x00; //38400
 
 UCSR0B = 0x98;
 
 uart0_reset_count=0;
 rx_ok=0;
 tx_en=1;
 for(i=0;i<15;i++)
 {
 	tx0_buf[i]=0x00;
 	rx0_buf[i]=0x00;
 }

 SET_485_RX0();
}
//-------------
void uart0_tx (void)
{
	do{
	}while(!tx_en);
	tx_en=0;
	SET_485_TX0();
	UCSR0B=(1<<TXEN0)|(1<<UDRIE0);
}
//--------------------
void uart0_handle (void)
{
	if(rx_ok)
 	{ 
 	  command_handle0();
 	  rx_ok=0;
 	  
 	};
 	
 	if(!uart0_reset_count)rx0_step=0;//接收超时处理
}