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 * Copyright (C) 2017 Robert Bosch. All Rights Reserved. 
 *
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 *
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 * incidental, or consequential damages, arising from any product use not covered by the parameters of
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/*!
 * @file bsec_iot_example.c
 *
 * @brief
 * Example for using of BSEC library in a fixed configuration with the BME680 sensor.
 * This works by running an endless loop in the bsec_iot_loop() function.
 */

/*!
 * @addtogroup bsec_examples BSEC Examples
 * @brief BSEC usage examples
 * @{*/

/**********************************************************************************************************************/
/* header files */
/**********************************************************************************************************************/

#include "bsec_integration.h"
#include <stdio.h>
#include "coines.h" 
/*********************************************************************/
/* global variables */
/*********************************************************************/
/*! @brief This structure containing relevant bme680 info */
extern struct bme680_dev bme680_g;

/**********************************************************************************************************************/
/* functions */
/**********************************************************************************************************************/

/*!
 * @brief           Write operation in either I2C or SPI
 *
 * param[in]        dev_addr        I2C or SPI device address
 * param[in]        reg_addr        register address
 * param[in]        reg_data_ptr    pointer to the data to be written
 * param[in]        data_len        number of bytes to be written
 *
 * @return          result of the bus communication function
 */
int8_t bus_write(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data_ptr, uint16_t data_len)
{
    /* System specific function to write to the bus where BME680 is connected */
    return bme680_g.write(dev_addr, reg_addr, reg_data_ptr, data_len);

}

/*!
 * @brief           Read operation in either I2C or SPI
 *
 * param[in]        dev_addr        I2C or SPI device address
 * param[in]        reg_addr        register address
 * param[out]       reg_data_ptr    pointer to the memory to be used to store the read data
 * param[in]        data_len        number of bytes to be read
 *
 * @return          result of the bus communication function
 */
int8_t bus_read(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data_ptr, uint16_t data_len)
{

    /* System specific function to read from bus where BME680 is connected */
    return bme680_g.read(dev_addr, reg_addr, reg_data_ptr, data_len);

}

/*!
 * @brief           System specific implementation of sleep function
 *
 * @param[in]       t_ms    time in milliseconds
 *
 * @return          none
 */
void sleep(uint32_t t_ms)
{
    /* System specific function sleep or delay for t_ms milliseconds */
    bme680_g.delay_ms(t_ms);
}

/*!
 * @brief           Capture the system time in microseconds
 *
 * @return          system_current_time    current system timestamp in microseconds
 */
int64_t get_timestamp_us()
{
    int64_t system_current_time = 0;

    system_current_time = coines_get_millis();
    /* Return time in micro seconds */
    return (system_current_time * 1000);
}

/*!
 * @brief           Handling of the ready outputs
 *
 * @param[in]       timestamp       time in nanoseconds
 * @param[in]       iaq             IAQ signal
 * @param[in]       iaq_accuracy    accuracy of IAQ signal
 * @param[in]       temperature     temperature signal
 * @param[in]       humidity        humidity signal
 * @param[in]       pressure        pressure signal
 * @param[in]       raw_temperature raw temperature signal
 * @param[in]       raw_humidity    raw humidity signal
 * @param[in]       gas             raw gas sensor signal
 * @param[in]       bsec_status     value returned by the bsec_do_steps() call
 *
 * @return          none
 */
void output_ready(int64_t timestamp, float iaq, uint8_t iaq_accuracy, float temperature, float humidity,
     float pressure, float raw_temperature, float raw_humidity, float gas, bsec_library_return_t bsec_status,
     float static_iaq, float co2_equivalent, float breath_voc_equivalent)
{
    if (bsec_status == BSEC_OK)
    {
        printf("t(s):%.2f, IAQ:%.2f IAQ_accuracy:%d, T(C):%.2f, RH(%%):%.2f, P(hPa):%.2f, T_raw(C):%.2f, RH_raw(%%):%.2f, gas:%.0f, IAQ_static:%.2f, CO2_eq:%.2f, Breath_VOC_eq:%.2f\n",
               (float)(timestamp / 1000000000.0), iaq, iaq_accuracy, temperature, humidity, pressure/100.0, raw_temperature, raw_humidity, gas, static_iaq, co2_equivalent, breath_voc_equivalent);
        fflush(stdout);
    }
}

/*!
 * @brief           Load previous library state from non-volatile memory
 *
 * @param[in,out]   state_buffer    buffer to hold the loaded state string
 * @param[in]       n_buffer        size of the allocated state buffer
 *
 * @return          number of bytes copied to state_buffer
 */
uint32_t state_load(uint8_t *state_buffer, uint32_t n_buffer)
{
    // ...
    // Load a previous library state from non-volatile memory, if available.
    //
    // Return zero if loading was unsuccessful or no state was available, 
    // otherwise return length of loaded state string.
    // ...
    return 0;
}

/*!
 * @brief           Save library state to non-volatile memory
 *
 * @param[in]       state_buffer    buffer holding the state to be stored
 * @param[in]       length          length of the state string to be stored
 *
 * @return          none
 */
void state_save(const uint8_t *state_buffer, uint32_t length)
{
    // ...
    // Save the string some form of non-volatile memory, if possible.
    // ...
}
 
/*!
 * @brief           Load library config from non-volatile memory
 *
 * @param[in,out]   config_buffer    buffer to hold the loaded state string
 * @param[in]       n_buffer        size of the allocated state buffer
 *
 * @return          number of bytes copied to config_buffer
 */
uint32_t config_load(uint8_t *config_buffer, uint32_t n_buffer)
{
    // ...
    // Load a library config from non-volatile memory, if available.
    //
    // Return zero if loading was unsuccessful or no config was available, 
    // otherwise return length of loaded config string.
    // ...
    return 0;
}

/*!
 * @brief       Main function which configures BSEC library and then reads and processes the data from sensor based
 *              on timer ticks
 *
 * @return      result of the processing
 */
int main()
{
    return_values_init ret;
    
    /* Call to the function which initializes the BSEC library 
     * Switch on low-power mode and provide no temperature offset */
    ret = bsec_iot_init(BSEC_SAMPLE_RATE_LP, 0.0f, bus_write, bus_read, sleep, state_load, config_load);
    if (ret.bme680_status)
    {
        /* Could not intialize BME680 */
        return (int)ret.bme680_status;
    }
    else if (ret.bsec_status)
    {
        /* Could not intialize BSEC library */
        return (int)ret.bsec_status;
    }
    
    /* Call to endless loop function which reads and processes data based on sensor settings */
    /* State is saved every 10.000 samples, which means every 10.000 * 3 secs = 500 minutes  */
    bsec_iot_loop(sleep, get_timestamp_us, output_ready, state_save, 10000);
    
    return 0;
}

/*! @}*/