//该模拟串口为半双工模式， 2400/8/N/1
//如需不同波特率改变T2定时器的时间便可

//作者： wangjxy    QQ: 4183782
//广州  2007-06-08

#pragma vector = TIMER2_OVF_vect
__interrupt
void T2time139us(void)
{
	static unsigned char bit;
	static unsigned char count;
	static unsigned char stat_flag;
	static unsigned char tmp;
	static unsigned char recv_byte;
	TCNT2 = 152;
	
	if((Uart1_RX_overtimer != 0) && (Uart1_RX_overtimer != 0xff)){
         Uart1_RX_overtimer--;
    }
    
    if( Uart1_RX_overtimer == 0 ){
    	asm("sei");
		return;
	}
	
	if(Uart1_send_haveframe == NONE)
	{
		if(Uart1_recv_haveframe != NONE) {
			asm("sei");
			return;
		}

		if(stat_flag == 0xa5){
			stat_flag = 0;
			bit = 1;
			count = 0;
			tmp = 0;
			recv_byte = 0;
			asm("sei");
			return;
		}

		if(bit == 0)
		{
			if(!(IORxd_PIN & (1<<IORxd_BIT))){
				count ++;
				if(count >= 2)  stat_flag = 0xa5;
			}
			else{
				count = 0;
				stat_flag = 0;
			}
			asm("sei");
			return;
		}
		if(bit == 9)
		{
			if(!(IORxd_PIN & (1<<IORxd_BIT))) {
				asm("sei");
				return;
			}
			count++;
			if(count >= 3 ){
				bit = 0;
				count = 0;
				Uart1_recv_buf[Uart1_recv_pt++] = recv_byte;
				if(Uart1_recv_pt>=63) Uart1_recv_pt = 62;
				Uart1_RX_overtimer = 100;
			}
			asm("sei");
			return;
		}
		tmp = tmp << 1;
		if((IORxd_PIN & (1<<IORxd_BIT))) tmp++;
		count ++;
		if(count >= 3){
			recv_byte = recv_byte >> 1;
			if( (tmp==3) || (tmp>4) ) recv_byte |= 0x80;
			tmp = 0;
			count = 0;
			bit ++;
		}
	}

	else
	{
		count++;
		if(count >= 3)
		{
			count = 0;
			if(bit == 0){
				IOTxd_PORT &= ~(1<<IOTxd_BIT);
			}
			else if(bit == 9)
			{
				IOTxd_PORT |= (1<<IOTxd_BIT);
				Uart1_send_pt ++;
				if(Uart1_send_pt >= Uart1_neet_send){
					Uart1_send_haveframe = NONE;
				}
			}
			else
			{
				if((Uart1_send_buf[Uart1_send_pt] & (1<<(bit-1))) == 0)  IOTxd_PORT &= ~(1<<IOTxd_BIT);
				else IOTxd_PORT |= (1<<IOTxd_BIT);
			}
			
			if(bit >= 9) bit = 0;
			else 	bit ++;
		}
	}
	asm("sei"); 
}