mhz19.h

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/*
 * Copyright (C) 2018 Koen Zandberg <koen@bergzand.net>
 * Copyright (C) 2018 Beduino Master Projekt - University of Bremen
 * Copyright (C) 2020 Bas Stottelaar <basstottelaar@gmail.com>
 *
 * 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 <stdbool.h>
 
#include "saul.h"
 
#ifdef MODULE_MHZ19_UART
#include "periph/uart.h"
#include "mhz19_internals.h"
#include "mutex.h"
#endif /* MODULE_MHZ19_UART */
 
#ifdef MODULE_MHZ19_PWM
#include "periph/gpio.h"
#endif /* MODULE_MHZ19_PWM */
 
#ifdef __cplusplus
extern "C" {
#endif
 
enum {
    MHZ19_OK            =  0,       
    MHZ19_ERR_INIT      = -1,       
    MHZ19_ERR_TIMEOUT   = -2,       
    MHZ19_ERR_CHECKSUM  = -3,       
};
 
#ifdef MODULE_MHZ19_UART
typedef struct {
    uart_t uart;                
    bool auto_calibration;      
} mhz19_params_t;
 
typedef struct {
    const mhz19_params_t *params;   
    mutex_t mutex;                  
    mutex_t sync;                   
    uint8_t idx;                    
    uint8_t rxmem[MHZ19_BUF_SIZE];  
} mhz19_t;
#endif /* MODULE_MHZ19_UART */
 
#ifdef MODULE_MHZ19_PWM
typedef struct {
    gpio_t pin;     
} mhz19_params_t;
 
typedef struct {
    gpio_t pin;     
} mhz19_t;
#endif /* MODULE_MHZ19_PWM */
 
extern const saul_driver_t mhz19_ppm_saul_driver;
 
int mhz19_init(mhz19_t *dev, const mhz19_params_t *params);
 
int mhz19_get_ppm(mhz19_t *dev, int16_t *ppm);
 
#ifdef MODULE_MHZ19_UART
void mhz19_set_auto_calibration(mhz19_t *dev, bool enable);
 
void mhz19_calibrate_zero_point(mhz19_t *dev);
#endif
 
#ifdef __cplusplus
}
#endif