libp7/src/core/init.c

/* ************************************************************************** */
/*                                       _____           _                    */
/*  core/init.c                         |_   _|__  _   _| |__   ___ _   _     */
/*  | Project: libp7                      | |/ _ \| | | | '_ \ / _ \ | | |    */
/*                                        | | (_) | |_| | | | |  __/ |_| |    */
/*  By: thomas <thomas@touhey.fr>         |_|\___/ \__,_|_| |_|\___|\__, |.fr */
/*  Last updated: 2017/01/19 12:25:05                               |___/     */
/*                                                                            */
/* ************************************************************************** */
#include <libp7/internals.h>
#include <libp7/internals/sleep.h>
#include <stdio.h>

/**
 *	p7_init:
 *	Initialize and automatically find a USB device.
 *
 *	@arg	handle		the handle.
 *	@arg	flags		the flags.
 *	@return				the error code (0 if ok).
 */

int p7_init(p7_handle_t **handle, unsigned int flags)
{
#ifdef P7_NOUSB
	(void)handle;
	(void)flags;
	return (p7_error_nocalc);
#else

	int err = p7_error_nocalc;
	int tries = INIT_TRIES;
	int failed = 0;

	do /* a barrel roll */ {
		if (failed) {
			logr_info("Trying again in one second.");
			sleep(1);
		}

		/* platform-specific communication methods */
# if !defined(P7_DISABLED_STREAMS)
		err = p7_fdinit(handle, flags, NULL, -1, -1);
# elif !defined(P7_DISABLED_WINDOWS)
		err = p7_winit(handle, flags, NULL);
# endif
		/* check error */
		if (err != p7_error_nocalc)
			return (err);

		/* libusb communication methods - more or less platform-independent */
# if !defined(P7_DISABLED_LIBUSB)
		logr_info("Looking for general libusb devices");
		err = p7_libusbinit(handle, flags);
		if (err != p7_error_nocalc)
			return (err);
# endif

		/* wait a little */
		logr_error("didn't find the calculator!");
		failed = 1;
	} while (--tries);

	/* no found calc, by the look of it. */
	return (p7_error_nocalc);
#endif
}

/**
 *	p7_cominit:
 *	Initialize on a COM port.
 *
 *	@arg	handle		the handle.
 *	@arg	flags		the flags.
 *	@arg	com			the COM port ID.
 *	@return				the error code (0 if ok).
 */

int p7_cominit(p7_handle_t **handle, unsigned int flags, int com)
{
#ifdef P7_NOSERIAL
	(void)handle;
	(void)active;
	(void)check;
	(void)com;
	return (p7_error_nocalc);
#else
	int err, tries = INIT_TRIES;
	int failed = 0;

	/* check the com port number */
	if (com < 1 || com > 20)
		return (p7_error_com);

	do /* the flop */ {
		if (failed) {
			logr_info("Trying again in one second.");
			sleep(1);
		}

		/* platform-specific communication methods */
# if !defined(P7_DISABLED_STREAMS)
		err = p7_fdcominit(handle, flags, com);
# elif !defined(P7_DISABLED_WINDOWS)
		err = p7_wcominit(handle, flags, com);
# endif

		/* check error */
		if (err != p7_error_nocalc)
			return (err);

		failed = 1;
	} while (--tries);

	/* finish. */
	return (p7_error_nocalc);
#endif
}