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Next Previous Contents Linux I/O port programming mini-HOWTO Author: Riku Saikkonen <Riku.Saikkonen@hut.fi> v3.0, 2024-12-13 This HOWTO document describes programming hardware I/O ports and waiting for small periods of time in user-mode Linux programs running on the Intel x86 architecture. 1. Introduction 2. Using I/O ports in C programs 2.1 The normal method 2.2 An alternate method: /dev/port 3. Interrupts (IRQs) and DMA access 4. High-resolution timing 4.1 Delays 4.2 Measuring time 5. Other programming languages 6. Some useful ports 6.1 The parallel port 6.2 The game (joystick) port 6.3 The serial port 7. Hints 8. Troubleshooting 9. Example code 10. Credits Next Previous Contents

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