Srinivas B T
Linux Device Drivers
Linux Device Drivers
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Linux Modules Character drivers IO & Memory Linux Kernel Process Management Process Address space Linux Scheduler Memory Management Interrupts Signals System Calls Kernel Synchronization Linux Inter Process Communications Serial Ports Parallel Ports Introduction to Hardware Linux Timers DMA in Linux Linux Threads Linux Thread Synchronization Linux Multi Threading Debugging in Linux GDB GNU Debugger KDB Kernel Debugger KGDB Kernel GNU Debugger Example Ethernet Driver |
Interfacing the standard parallel port Port Addresses
Data Port
Status Port
Control Port
Writing to Data Port The base address, usually called the Data Port or Data Register is simply used for outputting data on the Parallel Port's data lines (Pins 2-9). Using Parallel Port’s IRQ The Parallel Port's interrupt request is normally IRQ5 or IRQ7 but may be something else if these are in use. The Parallel Port interrupt can be disabled and enabled using bit 4 of the control register, Enable IRQ Via AckLine. Once enabled, an interrupt will occur upon a low to high transition (rising edge) of the nACK. |
