Use the C language interrupt mode to implement serial port read/write

# Include <stdio. h>
# Include <dos. h>
# Include <time. h>

# Define LSB 0
# Define MSB 1

# Define RXR 0
# Define txr 0
# Define ier 1
# Define IIR 2
# Define LCR 3
# Define MCR 4
# Define LSR 5
# Define MSR 6

# Define combench base 0x3f8
# Define uchar unsigned char

Volatile uchar inputdata;
Volatile uchar oninput = 0x00;
Volatile uchar onoutput = 0x00;
Volatile uchar inputdata [256];/* set the size of the receiving buffer */
Volatile unsigned int count;/* Number of data received during interruption */
Int datacount;/* Number of currently sent data lines */

Void interrupt (* oldvect) ();/* function is used to obtain Interrupt ProcessingProgram*/
Void interrupt serialisr ();

Void initcom ()
{
Uchar inttemp;
/* Set the baud rate or something */
Outportb (combench base + LCR, 0x80);/* set the high level of LCR to 1 to read other registers */
Outportb (combench base + LSB, 0x0c);/* divisor lock (8-bit low) DLL */
Outportb (comstmbase + MSB, 0x00);/* divisor lock (8-bit high) DLH generates 2400 baud rate */
Outportb (combench base + LCR, 0x03);/* 8-bit data, 1-bit stop bit, no verification */
Outportb (combench base + IER, 0x01);/* interrupt mode for receiving */

/* Set the interrupt vector */
Oldvect = getvect (0x0c);/* the function is used to obtain the entry address of the interrupt handler */
Disable ();
Inttemp = inportb (0x21) & 0xef;
Outportb (0x21, inttemp );
Setvect (0x0c, serialisr);/* set the interrupt entry address of serialisr to 0x0c */
Enable ();
}

Void closecom ()
{
Disable ();
Outportb (combench base + IER, 0x00); * disable interruption */
Outportb (combench base, 0x00 );
Outportb (0x21, inportb (0x21) | ~ (0xef ));
Setvect (0x0c, oldvect );
}

Void interrupt serialisr ()
{
/* Serial port interruption ServiceCode*/
Inputdata = inportb (comdeskbase + RXR );
Oninput = 0x01;
Inputdata [count] = inputdata;
Count ++;
/* End the Service Code */
Outportb (0x20, 0x20);/* code for stopping */
}

Void sendchar (uchar key)
{
While (inportb (combench base + LSR) & 0x40) = 0 );
Outportb (combench base + txr, key );
}
/* ............ Latency function ......................*/
Void delay (unsigned int N)
{
Unsigned int I, K;
For (k = 0; k <n; k ++)
{
For (I = 1; I <1142; I ++)
;
}
}

/* ...... The CDMA Command sends the function .................*/
Void CDMA _commandsend (char * P, unsigned int N)
{

Int I, K, M, L;
Int flag = 0;
Int selse_flag = 0; int selse_flag_1 = 0;
Int selse_flag1 = 0; int selse_flag1_1 = 0;
Time_t start, end;
Double DIF = 0;
Char;

Uchar bexit_flag = 0x00;
Count = 0;
While (! Bexit_flag)
{
Count = 0;
For (I = 0; I <n; I ++)
{Sendchar (* P); delay (9000); P ++ ;}

/* ...... Wait for 2 S ..................*/
Time (& START );
DIF = 0;
While (DIF <2)
{
Delay (9000 );
Time (& End );
DIF = difftime (end, start );
}
If (count> 14)
{
Time (& START );
DIF = 0;
While (DIF <3)
{
Delay (9000 );
Time (& End );
DIF = difftime (end, start );
}
}

/* ...... Determine whether the sending command is successful ..................*/
For (m = 0; m <count; m ++)
{
If (count> 10)
{
For (L = 0; L <count; l ++)
{
If (inputdata [L-1] = 'n' & inputdata [L-2] = 'E' & inputdata [L-3] = 'P' & inputdata [L-4] = = 'O' & inputdata [l-5] = 'P' & inputdata [L-6] = 'P' & inputdata [L-7] = 'P' & inputdata [L-8] = 'V ') {selse_flag_1 = 1 ;}
If (inputdata [L-1] = 'n' & inputdata [L-2] = 'E' & inputdata [L-3] = 'P' & inputdata [L-4] = = 'O' & inputdata [l-5] = 'P' & inputdata [L-6] = 'C' & inputdata [L-7] = 'T' & inputdata [L-8] = 'V ') {selse_flag1_1 = 1 ;}
}

If (selse_flag_1 = 1) {If (inputdata [M-1] = '3' & inputdata [m-2] = '3' & inputdata [M-3] = ': '& inputdata [M-4] = 'T') selse_flag = 1 ;}
If (selse_flag1_1 = 1) {If (inputdata [M-1] = '0' & inputdata [m-2] = ', '& inputdata [M-3] = '1' & inputdata [M-4] =': '& inputdata [M-5] = 'n') selse_flag1 = 1 ;}

If (selse_flag_1 = 1 | selse_flag1_1 = 1)
{
If (selse_flag = 1) {If (inputdata [M-1] = '0' & inputdata [m-2] = ': '& inputdata [M-3] = 'n' & inputdata [M-4] = 'E') Flag = 1 ;}
If (selse_flag1 = 1) {If (inputdata [M-1] = '0' & inputdata [m-2] = ', '& inputdata [M-3] = '1' & inputdata [M-4] =': '& inputdata [M-5] =' s ') Flag = 1 ;}
}
Else {If (inputdata [M-1] = 'O' & inputdata [m] = 'k') {flag = 1 ;}}
}
Else {If (inputdata [M-1] = 'O' & inputdata [m] = 'k') Flag = 1 ;}
}
If (flag = 1) {bexit_flag = 0x01 ;}
Else {P = p-n ;}

For (I = 0; I <count; I ++) printf ("% C", inputdata [I]);
/*........ Press the space to stop the test ............................. */
If (kbhit () {A = getch (); if (a = '') {closecom (); exit (1 );}}

}
}

/* ...... Data test and sending task .....................*/
Void data_send (char * pcomd, int N, char * pdata, int m)
{
Int I, K, L; time_t start, end;
Double DIF = 0;
Count = 0;
For (I = 0; I <n; I ++)
{
Sendchar (* pcomd); delay( 9000); pcomd ++;
}
Time (& START );
DIF = 0;
While (DIF <1, 0.2)
{
Delay (9000 );
Time (& End );
DIF = difftime (end, start );
}

For (L = 0; L <m; l ++)
{
Sendchar (* pdata); pdata ++;
}

Printf ("the data num: % d", datacount );
Datacount ++;
}

void main ()
{int I; char a;
/*........ module test command .................................. */
uchar CDMA _command_1 [] = {"at \ r" };< br> uchar CDMA _command_2 [] = {"atz \ r "};
uchar CDMA _command_3 [] = {"ate1v1 \ r" };< br> uchar CDMA _command_4 [] = {"at + CRM = 1; + CPS = 33; + cmux = 1; + CTA = 0 \ r "};
uchar CDMA _command_5 [] = {" at + vpppopen \ r "};
uchar CDMA _command_6 [] = {"at + vtcpopen = 1, \" 60.63.42.129 \ ", 1234 \ r"};
uchar CD Ma_command_7 [] = {"at + vtcpsend = 1, 20 \ r" };
uchar CDMA _data [] = {"abcdefghijklmnopqrst "};
uchar CDMA _command_9 [] = {"at + vpppclose \ r"};
uchar CDMA _command_8 [] = {"at + vtcpclose = 1 \ r "};
uchar bexit_flag1 = 0x00;
time_t start, end;
double DIF = 0;
initcom (); /* initialize Port 1 */
inputdata = inportb (comdeskbase + RXR);
while (! Bexit_flag1)
{
/*............................... .................................. */
If (kbhit ()) /* press any key to start testing CDMA */
{< br> /*...................... ........................................... */

/*......... send the TCP disconnection command ..................................... */
CDMA _commandsend (CDMA _command_8, strlen (CDMA _command_8);
/*......... send the PPP disconnection command .................................... .. */
CDMA _commandsend (CDMA _command_9, strlen (CDMA _command_9);

/*......... send the AT command ..................................... ..... */
CDMA _commandsend (CDMA _command_1, strlen (CDMA _command_1);
/*......... send the atz command ..................................... .... */
CDMA _commandsend (CDMA _command_2, strlen (CDMA _command_2);
/*......... send the ate1v1 command ...................................... */
CDMA _commandsend (CDMA _command_3, strlen (CDMA _command_3);
/*......... send the at initialization command .................................... */
CDMA _commandsend (CDMA _command_4, strlen (CDMA _command_4);
/*......... send the PPP dialing command ..................................... */
CDMA _commandsend (CDMA _command_5, strlen (CDMA _command_5);
/*......... send the network connection command .................................... */
CDMA _commandsend (CDMA _command_6, strlen (CDMA _command_6);
/*......... send data ...................................... ...... */
datacount = 0;
while (1)
{
data_send (CDMA _command_7, strlen (CDMA _command_7), CDMA _data, strlen (CDMA _data ));

Time (& START );
DIF = 0;
While (DIF <1, 0.2)
{
Delay (9000 );
Time (& End );
DIF = difftime (end, start );
}

If (kbhit () {A = getch (); if (a = '') {bexit_flag1 = 0x01; break ;}}
}
/*......... Send the TCP disconnection command ..................................... */
For (I = 0; I <3; I ++)
CDMA _commandsend (CDMA _command_8, strlen (CDMA _command_8 ));
/*......... Send the PPP disconnection command .................................... .. */
For (I = 0; I <3; I ++)
CDMA _commandsend (CDMA _command_9, strlen (CDMA _command_9 ));

Bexit_flag1 = 0x01;
}

/*...................................... ........................... */

}
Closecom ();/* close Port 1 */
Printf ("Bye ~. \ N ");
}