block_rangecheck.c 3.09 KB
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/*
	Copyright Jeroen Vreeken (jeroen@vreeken.net), 2013

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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#include <controller/controller_block.h>
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/*
       inputs      outputs
       nr name     nr name

     ----------------------
     |                    |
  ---| 0  in    0   valid |----
     |	        1 invalid |
     ----------------------

     
 */

struct controller_block_private {
	float *in;
	bool valid;
	bool invalid;

	float min;
	float max;
};

static void rangecheck_calculate(struct controller_block *check)
{
	struct controller_block_private *priv = check->private;
	float in = *priv->in;
	bool invalid;
	
	invalid = (in < priv->min) | (in > priv->max);
	
	priv->invalid = invalid;
	priv->valid = !invalid;
}

static struct controller_block_param_list params[] = {
	{ "max", false },
	{ "min", false },
	{ NULL },
};

static void param_get(struct controller_block *check, int param, void *val)
{
	switch (param) {
		case 0:
			*(float*)val = check->private->max;
			break;
		case 1:
			*(float*)val = check->private->min;
			break;
	}
}

static void param_set(struct controller_block *check, int param, va_list val)
{
	switch (param) {
		case 0:
			check->private->max = va_arg(val, double);
			break;
		case 1:
			check->private->min = va_arg(val, double);
			break;
	}
}

static struct controller_block_interm_list interms[] = {
	{ "in",  CONTROLLER_BLOCK_TERM_FLOAT, 
	    offsetof(struct controller_block_private, in)  },
	{ NULL },
};

static struct controller_block_outterm_list outterms[] = {
	{ "valid",  CONTROLLER_BLOCK_TERM_BOOL, 
	    offsetof(struct controller_block_private, valid)  },
	{ "invalid",  CONTROLLER_BLOCK_TERM_BOOL, 
	    offsetof(struct controller_block_private, invalid)  },
	{ NULL },
};


struct controller_block * block_rangecheck_create(char *name)
{
	struct controller_block *check;
	
	check = controller_block_alloc("rangecheck", name,
	    sizeof(struct controller_block_private));
	if (!check)
		return NULL;

	check->private->invalid = true;
	check->private->valid = false;
	check->private->max = 0.0;
	check->private->min = 0.0;

	if (controller_block_interm_list_init(check, interms))
		goto err_block;

	if (controller_block_outterm_list_init(check, outterms))
		goto err_block;

	check->calculate = rangecheck_calculate;

	if (controller_block_param_list_init(check, params))
		goto err_block;

	check->param_get = param_get;
	check->param_set = param_set;

	controller_block_add(check);
	return check;

err_block:
	controller_block_free(check);
	return NULL;
}