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robotics:computing:linux_asynchronous_serial_programming_how_to
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| - | ====== Introduction ====== | ||
| - | This article describes asynchrous serial programming using signal handler. | ||
| - | |||
| - | == References == | ||
| - | * Serial Programming HOWTO : [[http://tldp.org/HOWTO/Serial-Programming-HOWTO/]] | ||
| - | |||
| - | == Hardware used : == | ||
| - | * A desktop PC. | ||
| - | * Roboard RB-100 : [[http://www.roboard.com/RB-100.htm]] | ||
| - | * Mini PCI VGA Card : [[http://www.icop.com.tw/pddetail.aspx?id=93&pid=4]] | ||
| - | * 4 Go micro SD card plugged in the built-in micro-SD card reader. | ||
| - | * An internet connection. | ||
| - | |||
| - | == Softwares : == | ||
| - | * Ubuntu 10.10 installed on both Roboard and desktop PC : [[http://www.ubuntu.com/]] | ||
| - | * Package **build-essential** already installed on your Ubuntu operating system. | ||
| - | |||
| - | ====== Asynchronous serial I/O library ====== | ||
| - | |||
| - | The following code is very simple. There is just one function to initialize the serial communication. | ||
| - | Only serial port device, baudrate and if there is a parity checking can be set. Everything else is hard coded, supposing we use 8 bits of data, 1 stop bit and a prefix on parity error. | ||
| - | Then it results in a very simple header file **serialCom.h** : | ||
| - | <code>#ifndef _SERIALCOM_H_ | ||
| - | #define _SERIALCOM_H_ | ||
| - | |||
| - | #ifdef __cplusplus | ||
| - | extern "C" | ||
| - | { | ||
| - | #endif | ||
| - | |||
| - | #include <termios.h> | ||
| - | |||
| - | /* Controls : CS8 = 8 bits | ||
| - | * CREAD = Enable reading */ | ||
| - | #define SERIAL_CONTROL (CS8 | CREAD) | ||
| - | |||
| - | /* Input : PARMRK = If IGNPAR is not set, prefix a character with a parity error or | ||
| - | framing error with \377 \0 */ | ||
| - | #define SERIAL_INPUT PARMRK | ||
| - | |||
| - | /* Handler type definition */ | ||
| - | typedef void | ||
| - | (*serial_handler)(int status); | ||
| - | |||
| - | /* Serial port initialization function */ | ||
| - | int | ||
| - | serialConfiguration(serial_handler, const char* device, tcflag_t baudrate, | ||
| - | char parity); | ||
| - | |||
| - | #ifdef __cplusplus | ||
| - | } | ||
| - | #endif | ||
| - | |||
| - | #endif | ||
| - | </code> | ||
robotics/computing/linux_asynchronous_serial_programming_how_to.1297034125.txt.gz · Dernière modification: 2012/09/20 10:52 (modification externe)
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