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adxl_util.h File Reference

Common routines for ADXL board - open,close, read, sighandler. More...

#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <sys/termios.h>
#include <fcntl.h>

Go to the source code of this file.

Data Structures
struct	adxl_reading_t
	Struct used to return raw and processed readings from the ADXL. More...
Defines
#define	_ADXL_UTIL_H_
#define	NUM_ADXL_CHANNELS   2
	Number of possible data channels - analog plus digital.
#define	ADXL_READ_LEN   4
	Number of bytes per ADXL reading.
#define	ADXL_DATUM_LEN   24
	Size of a NSDS-formatted reading - used for buffer sizing.
#define	ADXL_MAX_RATE_HZ   250
	Max sample rate, approximate.
Functions
int	adxl_open (const char *comport_file)
	Open port and configure control lines, etc.
int	adxl_read (const int comm_fd, adxl_reading_t *result)
	Read a single set of values from the ADXL board.
int	adxl_close (const int comm_fd)
	Simple wrapper to close the port.
void	adxl_sighandler (int signal)
	Control-break handler. Sets global flag to indicate exit request.
Variables
bool	control_break
	Global boolean set by signal handler to force exit.

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Detailed Description

Common routines for ADXL board - open,close, read, sighandler.

Date:

5/3/03

Author:

Paul Hubbard

Definition in file adxl_util.h.

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Define Documentation

#define _ADXL_UTIL_H_

Definition at line 34 of file adxl_util.h.

#define ADXL_DATUM_LEN   24

Size of a NSDS-formatted reading - used for buffer sizing. Definition at line 59 of file adxl_util.h. Referenced by daq_thread_main().

#define ADXL_MAX_RATE_HZ   250

Max sample rate, approximate. Definition at line 62 of file adxl_util.h. Referenced by main().

#define ADXL_READ_LEN   4

Number of bytes per ADXL reading. Definition at line 56 of file adxl_util.h. Referenced by adxl_read().

#define NUM_ADXL_CHANNELS   2

Number of possible data channels - analog plus digital. Definition at line 53 of file adxl_util.h. Referenced by adxl_do_work(), daq_do_work(), daq_thread_main(), data_channel_enabled(), data_channel_flag(), and main().

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Function Documentation

int adxl_close (  const int  COMM_FD  )

Simple wrapper to close the port. ... which releases the control lines and shuts down the DAQ. Parameters: COMM_FD  File descriptor of the opened serial port to be closed Return values: 0  Completed OK Non-zero  An error occurred Date: 3/11/02 Note: minor changes from original Definition at line 182 of file adxl_util.c. Referenced by adxl_do_work(), and daq_thread_main().

int adxl_open (  const char *  COMPORT_FILE  )

Open port and configure control lines, etc. Function to open the serial port and set up the rather peculiar comms requirements of the ADXL202: 38400 baud, N81 No flow control (?) Powered by RTS Parameters: COMPORT_FILE  Pointer to filename to open, not modified. If NULL, uses environment variable ADXL_PORT. If that's not defined, we try /dev/ttyS1 Returns: 0 Operation successful Non-zero An error occurred Definition at line 47 of file adxl_util.c. Referenced by adxl_do_work(), and daq_thread_main().

int adxl_read (  const int  COMM_FD, adxl_reading_t *  result )

Read a single set of values from the ADXL board. Parameters: COMM_FD  File descriptor of open serial port result  Pointer, used to store output Returns: 0 OK Non-zero Error occurred Note: Returns values from 0 to 100, with 50 being neutral. Definition at line 118 of file adxl_util.c. References ADXL_READ_LEN, adxl_reading_t::G, and adxl_reading_t::raw. Referenced by adxl_do_work(), and daq_thread_main().

void adxl_sighandler (  int  signal  )

Control-break handler. Sets global flag to indicate exit request. Note: Assumes installed in interrupt chain by someone else Parameters: signal  Signal number Note: Common with nees-di code, roll into library? Date: 3/25/02 Definition at line 202 of file adxl_util.c. References control_break. Referenced by main().

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Variable Documentation

bool control_break

Global boolean set by signal handler to force exit. Definition at line 49 of file adxl_util.h. Referenced by adxl_do_work(), adxl_sighandler(), daq_main_loop(), daq_thread_main(), and main().

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