Network Card User Manual
Table Of Contents
- PC-DIO-24 User Manual
- Contents
- About This Manual
- Chapter 1 Introduction
- Chapter 2 Configuration and Installation
- Chapter 3 Theory of Operation
- Chapter 4 Register-Level Programming
- Appendix A Specifications
- Appendix B I/O Connector
- Appendix C OKI 82C55A Data Sheet*
- Appendix D Customer Communication
- Glossary
- Index
- Figures
- Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware
- Figure 2-1. PC-DIO-24 Parts Locator Diagram
- Figure 2-2. Example Base I/O Address Switch Settings
- Figure 2-3. Jumper Settings–PC6, PC4, PC2, and N/C
- Figure 2-4. Interrupt Jumper Setting for IRQ5 (Factory Setting)
- Figure 2-5. Digital I/O Connector Pin Assignments
- Figure 3-1. PC-DIO-24 Block Diagram
- Figure 4-1. Control-Word Formats
- Figure B-1. PC-DIO-24 I/O Connector
- Tables
- Table 2-1. PC-DIO-24 Factory-Set Jumper and Switch Settings
- Table 2-2. Port C Signal Assignments
- Table 4-1. PC-DIO-24 Address Map
- Table 4-2. Port C Set/Reset Control Words
- Table 4-3. Mode 0 I/O Configurations
- Table 4-4. Interrupt Enable Signals for All Mode Combinations
- Table A-1. Maximum Average Transfer Rates for the PC-DIO-24
Chapter 4 Register-Level Programming
© National Instruments Corporation 4-9 PC-DIO-24 User Manual
Mode 1 Input 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_ADDRESS + PORTAoffset;
portb = BASE_ADDRESS + PORTBoffset;
portc = BASE_ADDRESS + PORTCoffset;
cnfg = BASE_ADDRESS + CNFGoffset;
/* EXAMPLE 1–port A input */
outp(cnfg,0xB0); /* Port A is an input in mode 1. */
while (!(inp(portc) & 0x20)); /* Wait until IBFA is set, indicating that
data has been loaded in port A. */
valread = inp(porta); /* Read the data from port A. */
/* EXAMPLE 2–port B input */
outp(cnfg,0x86); /* Port B is an input in mode 1. */
while (!(inp(portc) & 0x02)); /* Wait until IBFB is set, indicating that
data has been loaded in port B. */
valread = inp(portb);
}
Mode 1–Strobed Output
The control word written to the CNFG Register to configure port A for output in mode 1 is
shown as follows. Bits PC4 and PC5 of port C can be used as extra input or output lines when
port A uses mode 1 output.
1 0 1 0 1/0 XXX
7654 3210
1 = input
0 = output
Port C bits PC4 and PC5