pir.h

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/*
 * Copyright (C) 2014 Freie Universität Berlin
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include "sched.h"
#include "periph/gpio.h"
#include "stdbool.h"
 
#ifdef __cplusplus
extern "C" {
#endif

enum {
    PIR_OK       = 0,     
    PIR_NOGPIO   = -1,    
    PIR_NOTHREAD = -2,    
    PIR_TIMEERR  = -3,    
};

typedef struct {
    gpio_t gpio;      
    bool active_high; 
} pir_params_t;

typedef struct {
    uint64_t start_active_time;  
    uint64_t accum_active_time;  
    uint64_t last_read_time;     
    kernel_pid_t msg_thread_pid; 
    bool active;                 
    pir_params_t p;              
} pir_t;

#ifndef PIR_MSG_T_STATUS_START
#define PIR_MSG_T_STATUS_START 150
#endif

typedef enum {
    PIR_STATUS_ACTIVE = PIR_MSG_T_STATUS_START,   
    PIR_STATUS_INACTIVE,                          
} pir_event_t;

int pir_init(pir_t *dev, const pir_params_t* params);

pir_event_t pir_get_status(const pir_t *dev);

int pir_get_occupancy(pir_t *dev, int16_t *occup);

int pir_register_thread(pir_t *dev);
 
#ifdef __cplusplus
}
#endif