Srinivas B T
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 Serial Port The serial communication (asynchronous or synchronous) is implemented by several chip vendors. Asynchronous Comm Controller -16550 (Intel, NSC) Available as COM1/COM2 on PC 16450 Universal Asynchronous Receiver Transmitter (UART) Fully programmable serial-interface characteristics 5-6-7-or 8-bit characters Even odd or no-parity bit generation and detection 1-1-or 2-stop bit generation Baud generation (DC to 15M baud) MODEM control functions (CTS RTS DSR DTR RI and DCD) FIFO mode transmitter and receiver are each buffered with 16 byte FIFO’s to reduce the number of interrupts presented to the CPU
Null Modem wiring diagram
Table of Commonly Used Baudrate Divisors
tty core overview The Linux tty driver core lives right below the standard character driver level and provides a range of features focused on providing an interface for terminal style devices to use.
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