uart_main.c

使用Atmel88芯片实现RS485通讯,Modbus通讯协议.在IVR_AVR环境中编译,文件完整.

// ICC-AVR application builder : 2007-11-28 8:53:26
// Target : M48
// Crystal: 8.0000Mhz

#include <iom48v.h>
#include <macros.h>
#include "main.h"
#include "modbus.h"
#include "timer2.h"   
#include "led.h"

void test(void)
{
    // LedShowLink = 5678;
	testVarAnalog = 0x0102;
    testVarPoint = 0x0304;
    testVarInputUp = 0x0506;
    testVarInputDown = 0x0708;
}

void delay(uint num)
{
 	 while(num-->0)       
	      ;         
}

void port_init(void)
{
 PORTB = 0x00;
 DDRB  = 0x00;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}

#pragma interrupt_handler timer2_ovf_isr:10
void timer2_ovf_isr(void)
{
 TCNT2 = 0x83; //reload counter value
	
 timeBase.bits.bt1ms = 1;
}

#pragma interrupt_handler uart0_rx_isr:19
void uart0_rx_isr(void)
{    
 	uint8 tmp;
	receTimeOut = 10;    //通讯超时值
	//PORTC ^= 0x02;
	
	
	if(UCSR0A&BIT(FE0) != 0)  //帧错.			  //if(FERR==1)	
	{	
		UCSR0B &= ~BIT(RXEN0);  //CREN = 0;
		UCSR0A &= ~BIT(FE0);    //FERR = 0;
		UCSR0B |= BIT(RXEN0);   //CREN = 1; 
		tmp = UDR0;
		//PORTC ^= 0x02;
	}	
	//else if(OERR==1)	
	else if(UCSR0A&BIT(DOR0))  //溢出错.
	{ 
		UCSR0B &= ~BIT(RXEN0);  //CREN = 0; 
		UCSR0A &= ~BIT(DOR0);   //OERR = 0;
		UCSR0B |= BIT(RXEN0);   //CREN = 1; 
		tmp = UDR0;
		//PORTC ^= 0x02;
	}	
	else //奇偶校验的问题.
	{ 	
		//	RX9DBuf = RX9D; 
		// 读取接受寄存器中的数据.
		receBuf[receCount] = UDR0;     // RCREG; 
		// 奇校验判断.
			//if(RX9DBuf != ParityBit(&receBuf[receCount]))
	    if(UCSR0A&BIT(UPE0)!=0)  //奇校验硬件完成.
		{
		 	//PORTC ^= 0x02;					 
		 	UCSR0A |= BIT(UPE0);				   
			checkoutError = 1; 
		}			
		receCount++;				   // 接收地址偏移寄存器加1. 
		receCount &= 0x0f;             // 最多接受16个字节. 
	//	PORTC ^= 0x02;
	}   //
}	//void uart0_rx_isr(void)  				   


#pragma interrupt_handler uart0_udre_isr:21
void uart0_udre_isr(void)
{
//character transferred to shift register so UDR is now empty
//	 UDR0 = 0x01;
	  if(sendPosi<sendCount)  
	  {	
		  sendPosi++;   
		//	TX9D = ParityBit(sendBuf[sendPosi]);  
			UDR0 = sendBuf[sendPosi];  
	   }	 
	   else	
	   {	
//	receEnable();	 		//485芯片
	 	    if(UCSR0A&BIT(TXC0) != 0)                //if(TRMT)
		 	{
			 	receCount = 0;	
				checkoutError = 0;	
//--------------------------
				//UCSR0B &= ~BIT(UDRIE0);   //RXCIE0 清零. TXIE = 0;//在一组数据发送完成后关闭
				  UCSR0B &= ~BIT(TXCIE0);         
			    //TXEN = 0;           
				UCSR0B &= ~BIT(TXEN0);			  
				sendCount = 0;          
//--------------------------
				//  flag_bit = 0;        //&&&&&&&&
			}       
	    }           
}                   

void test_pin(void)
{
 DDRC |= 0x02;
 PORTC |= 0x02;	
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 uart0_init();
 timer2_init();
 led_init();
 
 test_pin();
 
 MCUCR = 0x00;
 EICRA = 0x00; //extended ext ints
 EIMSK = 0x00;
 
 TIMSK0 = 0x00; //timer 0 interrupt sources
 TIMSK1 = 0x00; //timer 1 interrupt sources
 TIMSK2 = 0x01; //timer 2 interrupt sources
 
 PCMSK0 = 0x00; //pin change mask 0 
 PCMSK1 = 0x00; //pin change mask 1 
 PCMSK2 = 0x00; //pin change mask 2
 PCICR = 0x00; //pin change enable 
 PRR = 0x84; //power controller
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

//
void main(void)
{
 	NOP();
	 init_devices();
	NOP(); 
	 singleKeyTranmit();
	delay(50000);
     singleKeyTranmit();	 
	test();	 
	
	
	 while(1)
	 {     
	 
	 	ReceiveFrameDisFun();   	 
	 
	    //UDR0 = 0x01;
		if(timeBase.bits.bt1ms) 
			  time_mission();
	    if(ledControl.bits.once128ms) // if(var_a == 1)		 	    // 
		{
		//PORTC ^= 0x02;				
		 	ledControl.bits.once128ms=0;	//var_a = 0; 				//						 
		   sub2();		
	    } 
		if(ledControl.bits.refurbish)  //if(var_b == 1)				//
		{
		//PORTC ^= 0x02;				
			ledControl.bits.refurbish=0;//var_b = 0;  		  	//  		
		 	 subled();	 
		}
		
     }//while(1)
}//void main(void)