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send_flag=1;
if((UCSR1A&0x20)!=0)
{
UDR1=ch;
delay_ms(100);
}
send_flag=0;
}
}

// send string
void write1_string(unsigned char *str){
int i=0;
if(!send_flag)
{
while(str[i]!=0)
{
write1_char(str[i]);
i++;
}
}
}

//at
void at0()
{
char var[5]="AT";
strcat(var,ENTER);
if(!send_flag)write0_string(var);
}

//at reset
void at_reset0(){
char var[20]="AT+RST";
strcat(var,HOME);
strcat(var,ENTER);
write0_string(var);
}

//at
void at1()
{
char var[5]="AT";
strcat(var,HOME);
strcat(var,ENTER);

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