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scd4x_i2c_example_usage.c
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scd4x_i2c_example_usage.c
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/*
* Copyright (c) 2021, Sensirion AG
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of Sensirion AG nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h> // printf
#include "scd4x_i2c.h"
#include "sensirion_common.h"
#include "sensirion_i2c_hal.h"
/**
* TO USE CONSOLE OUTPUT (PRINTF) IF NOT PRESENT ON YOUR PLATFORM
*/
//#define printf(...)
int main(void) {
int16_t error = 0;
sensirion_i2c_hal_init();
// Clean up potential SCD40 states
scd4x_wake_up();
scd4x_stop_periodic_measurement();
scd4x_reinit();
uint16_t serial_0;
uint16_t serial_1;
uint16_t serial_2;
error = scd4x_get_serial_number(&serial_0, &serial_1, &serial_2);
if (error) {
printf("Error executing scd4x_get_serial_number(): %i\n", error);
} else {
printf("serial: 0x%04x%04x%04x\n", serial_0, serial_1, serial_2);
}
// Start Measurement
error = scd4x_start_periodic_measurement();
if (error) {
printf("Error executing scd4x_start_periodic_measurement(): %i\n",
error);
}
printf("Waiting for first measurement... (5 sec)\n");
for (;;) {
// Read Measurement
sensirion_i2c_hal_sleep_usec(100000);
bool data_ready_flag = false;
error = scd4x_get_data_ready_flag(&data_ready_flag);
if (error) {
printf("Error executing scd4x_get_data_ready_flag(): %i\n", error);
continue;
}
if (!data_ready_flag) {
continue;
}
uint16_t co2;
int32_t temperature;
int32_t humidity;
error = scd4x_read_measurement(&co2, &temperature, &humidity);
if (error) {
printf("Error executing scd4x_read_measurement(): %i\n", error);
} else if (co2 == 0) {
printf("Invalid sample detected, skipping.\n");
} else {
printf("CO2: %u\n", co2);
printf("Temperature: %d m°C\n", temperature);
printf("Humidity: %d mRH\n", humidity);
}
}
return 0;
}