serial.c

51avr tcpip http协议

//-----------------------------------------------------------------------------
// SERIAL.C
//
// This module handles RS-232 messages and associated tasks
//-----------------------------------------------------------------------------

#include <string.h>
#include <avr/signal.h>
#include <avr/io.h>
#include "serial.h"
#include "net.h"
#include "general.h"

extern unsigned int event_word;

unsigned char RxBuf[RxBufLen] = "avrweb";
unsigned char RxBufn = 0;
//unsigned char TxBuf[TxBufLen];
//unsigned char TxBufn = 0;


void InitSerial(void)
{
   UBRR0H = UBRR0_V>>8;
   UBRR0L = (unsigned char)UBRR0_V; //1
   UCSR0A = (1<<TXC)|(0<<U2X);//no double baud
   UCSR0B = (1<<RXCIE)|(0<<TXCIE)|(1<<RXEN)|(1<<TXEN);
   UCSR0C = (0<USBS)|(3<<UCSZ0); //8bit,1stop
}

SIGNAL(SIG_UART0_RECV)
{
   event_word |= EVENT_RS232_ARRIVED;
   if(RxBufn>RxBufLen)RxBufn=0;//servo a cycle buffer
   RxBuf[RxBufn++] = UDR0;
}
/*
SIGNAL(SIG_UART0_TRANS)
{
   if(TxBufn)UDR0 = TxBuf[--TxBufn];//clear TxC flag,load uart,until Txbufn==0
}

void PrintStr(unsigned char* str)
{
   char i;
   while(!(TxBufn==0 && (UCSR0A&(1<<UDRE))));//both tx, uart buffer is empty 
   TxBufn = strlen(str);
   if(TxBufn)
   {   
      for(i=TxBufn;i>0;i--)TxBuf[i-1]=*str++;
      UDR0 = TxBuf[--TxBufn];
   }
}
*/
void PrintStr(unsigned char* str)
{
   while(*str)if(UCSR0A&(1<<UDRE))UDR0=*str++;
}