/*	FILE NAME: dm6430-soft-trigger.c	FILE DESCRIPTION: Software triggering sample program		This program demonstrates how to initiate an analog to digital		conversion using a software trigger.  Samples are taken from		the A/D board using software triggering.  The acquired data		is displayed on the screen.	PROJECT NAME: Linux DM6430 Driver, Library, and Example Programs	PROJECT VERSION: (Defined in README.TXT)	Copyright 2004 RTD Embedded Technologies, Inc.  All Rights Reserved.*/#include <errno.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/poll.h>#include <unistd.h>#include <dm6430lib.h>char *program_name_p;static voidusage(void) {    fprintf(	stderr,	"\n"        "Usage: %s MINOR_NUMBER"        "\n",	program_name_p    );    exit(EXIT_FAILURE);}static voidverify_success(int status, const char *message_p) {    if (status == -1) {	perror(message_p);	exit(EXIT_FAILURE);    }}static intisstdindata(int timeout) {    struct pollfd	in = {0, POLLIN | POLLERR | POLLPRI, 0};    int			num_fds;    while (((num_fds = poll(&in, 1, timeout)) == -1) && (errno == EINTR))	;    return ((num_fds == 1) && (in.revents & (POLLIN | POLLPRI)));}#define ADCHANNEL8	DM6430HR_AIN1	// A/D channel#define ADSLOPE8	(65536.0/20.0)	// Number Bits divided by AD Rangeintmain(int argument_count, char **arguments_p_p) {    int			descriptor;    int			status;    unsigned int	minor_number;    program_name_p = arguments_p_p[0];    if (argument_count != 2) {	fprintf(stderr, "Invalid number of options given.\n");	usage();    }    if (sscanf(arguments_p_p[1], "%u", &minor_number) == 0) {	fprintf(stderr, "Invalid device minor number.\n");	usage();    }    descriptor = OpenBoard6430(minor_number);    verify_success(descriptor, "OpenBoard6430() FAILED");    status = InitBoard6430(descriptor);    verify_success(status, "InitBoard6430() FAILED");    status = SetConversionSelect6430(descriptor, DM6430HR_CONV_SOFT_TRIGGER);    verify_success(status, "SetConversionSelect6430() FAILED");    status = SetChannelGain6430(	descriptor,	ADCHANNEL8,	DM6430HR_GAINx1,	DM6430HR_SE_SE    );    verify_success(status, "SetChannelGain6430() FAILED");    status = ClearADFIFO6430(descriptor);    verify_success(status, "ClearADFIFO6430() FAILED");    fprintf(stdout, "Single A/D conversion at AIN %d\n", (ADCHANNEL8 + 1));    fprintf(stdout, "Hit the ENTER key to perform one sample.\n");    fprintf(stdout, "Hit CONTROL-C to exit the program.\n");    while (isstdindata(-1)) {	int	empty_flag;	int16_t	data;	status = ClearADFIFO6430(descriptor);	verify_success(status, "ClearADFIFO6430() FAILED");	status = StartConversion6430(descriptor);	verify_success(status, "StartConversion6430() FAILED");	do {	    status = IsADFIFOEmpty6430(descriptor, &empty_flag);	    verify_success(status, "IsADFIFOEmpty6430() FAILED");	} while (empty_flag);	status = ReadADData6430(descriptor, &data);	verify_success(status, "ReadADData6430() FAILED");	fprintf(stdout, "%2.2lf V", data / ADSLOPE8);	while(isstdindata(1))	    getc(stdin);    }    exit(EXIT_SUCCESS);}