Appendix A
35
BPC-2010-NWC User’s Manual
Appendix A
DIO (Digital I/O) Sample Code
//============================================
//BPC-201 DOS DIO sample program
//Please compile with Turbo C 3.0 to utilized the program
//============================================
void main(){
int RetVal;
outp(0x2E,0x87);
outp(0x2E,0x01);
outp(0x2E,0x55);
outp(0x2E,0x55);
outp(0x2E,0x07);
outp(0x2F,0x07);
outp(0x2E,0x27);
outp(0x2F,0xFF);
outp(0x2E,0xc2);
outp(0x2F,0xff);
outp(0x2E,0xca);
outp(0x2F,0xf0);
//Reset Output Pins to all zero
//IO Port: 0xa22
//DIO_OUT 1 is bit 4
//DIO_OUT 2 is bit 5
//DIO_OUT 3 is bit 6
//DIO_OUT 4 is bit 7
RetVal=inp(0xa22);
RetVal=RetVal&0x0f;
outp(0xa22,RetVal);
system("pause");
//Turn on all Output Pins to all
RetVal=inp(0xa22);
RetVal=RetVal|0xf0;
outp(0xa22,RetVal);
system("pause");
//Read Input pins
//IO Port: 0xa22
//DIO_IN 1 is bit 0
//DIO_IN 2 is bit 1
//DIO_IN 3 is bit 2
//DIO_IN 4 is bit 3
RetVal=inp(0xa22);
RetVal=RetVal&0x0F;
printf("DI 1-4= %d",RetVal);
system("pause");
}
