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Chapter 4
Register-Level Programming
© National Instruments Corporation
4-11
PC-DIO-24 User Manual
At the digital I/O connector, port C has the following pin assignments when in mode 1 output.
Notice that the status of ACKA* and ACKB* is not included when port C is read.
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
OBFA*
ACKA*
I/O
I/O
INTRA
ACKB*
OBFB*
INTRB
Group A
Group B
Mode 1 Output Programming Example
Main() {
#define BASE_ADDRESS
0x210
/* Board located at address 210. */
#define PORTAoffset
0x00
/* Offset for port A */
#define PORTBoffset
0x01
/* Offset for port B */
#define PORTCoffset
0x02
/* Offset for port C */
#define CNFGoffset
0x03
/* Offset for CNFG */
register unsigned int porta, portb, portc, cnfg;
char valread;
/* Variable to store data read from a
port */
/* Calculate register addresses. */
porta = BASE_A PORTAoffset;
portb = BASE_A PORTBoffset;
portc = BASE_A PORTCoffset;
cnfg = BASE_A CNFGoffset;
/* EXAMPLE 1–port A output */
outp(cnfg,0xA0);
/* Port A is an output in mode 1.*/
while (!(inp(portc) & 0x80));
/* Wait until OBFA* is set, indicating
that the data last written to port A
has been read.*/
outp(porta,0x12);
/* Write data to port A. */
/* EXAMPLE 2–port B output */
outp(cnfg,0x84);
/* Port B is an output in mode 1.*/
while (!(inp(portc) & 0x02));
/* Wait until OBFB* is set, indicating
that the data last written to port B
has been read.*/
outp(portb,0x34);
/* Write the data to port B. */
}
Summary of Contents for PC-DIO-24
Page 51: ...Appendix C OKI 82C55A Data Sheet PC DIO 24 User Manual C 2 National Instruments Corporation...
Page 52: ...Appendix C OKI 82C55A Data Sheet National Instruments Corporation C 3 PC DIO 24 User Manual...
Page 53: ...Appendix C OKI 82C55A Data Sheet PC DIO 24 User Manual C 4 National Instruments Corporation...
Page 54: ...Appendix C OKI 82C55A Data Sheet National Instruments Corporation C 5 PC DIO 24 User Manual...
Page 55: ...Appendix C OKI 82C55A Data Sheet PC DIO 24 User Manual C 6 National Instruments Corporation...
Page 56: ...Appendix C OKI 82C55A Data Sheet National Instruments Corporation C 7 PC DIO 24 User Manual...
Page 57: ...Appendix C OKI 82C55A Data Sheet PC DIO 24 User Manual C 8 National Instruments Corporation...
Page 58: ...Appendix C OKI 82C55A Data Sheet National Instruments Corporation C 9 PC DIO 24 User Manual...
Page 59: ...Appendix C OKI 82C55A Data Sheet PC DIO 24 User Manual C 10 National Instruments Corporation...
Page 60: ...Appendix C OKI 82C55A Data Sheet National Instruments Corporation C 11 PC DIO 24 User Manual...
Page 61: ...Appendix C OKI 82C55A Data Sheet PC DIO 24 User Manual C 12 National Instruments Corporation...
Page 62: ...Appendix C OKI 82C55A Data Sheet National Instruments Corporation C 13 PC DIO 24 User Manual...
Page 63: ...Appendix C OKI 82C55A Data Sheet PC DIO 24 User Manual C 14 National Instruments Corporation...
Page 64: ...Appendix C OKI 82C55A Data Sheet National Instruments Corporation C 15 PC DIO 24 User Manual...
Page 65: ...Appendix C OKI 82C55A Data Sheet PC DIO 24 User Manual C 16 National Instruments Corporation...
Page 66: ...Appendix C OKI 82C55A Data Sheet National Instruments Corporation C 17 PC DIO 24 User Manual...