RTEMS 4.9.2 On-Line Library

Console Driver Introduction

BSP and Device Driver Development Guide

8.1: Introduction

This chapter describes the operation of a console driver using the RTEMS POSIX Termios support. Traditionally RTEMS has referred to all serial device drivers as console device drivers. A console driver can be used to do raw data processing in addition to the "normal" standard input and output device functions required of a console.

The serial driver may be called as the consequence of a C Library call such as printf or scanf or directly via the read or write system calls. There are two main functioning modes:

console: formatted input/output, with special characters (end of line, tabulations, etc.) recognition and processing,
raw: permits raw data processing.

One may think that two serial drivers are needed to handle these two types of data, but Termios permits having only one driver.

BSP and Device Driver Development Guide