59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
/*
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* sht4x.h
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*
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* Created on: Jun 8, 2021
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* Author: user
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*/
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#ifndef INC_SCD4X_H_
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#define INC_SCD4X_H_
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#include "stdint.h"
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#include "stm32l0xx_ll_i2c.h"
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#include "stm32l0xx_ll_utils.h"
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#include "i2c.h"
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#include "crc8.h"
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/*
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* Defines & macros
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*/
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#define SCD4X_I2C_ADDRESS 0x62
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/*
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* Return values
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*/
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#define SCD4X_OK 0
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#define SCD4X_ERROR -1 // generic error
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#define SCD4X_CRC8_ERROR -2 // checksum failed
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/*
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* Data types
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*/
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typedef enum {
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SCD4X_START_PERIODIC_MEASUREMENT = 0x21B1,
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SCD4X_READ_MEASUREMENT = 0xEC05,
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SCD4X_STOP_PERIODIC_MEASUREMENT = 0x3F86,
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SCD4X_GET_DATA_READY_STATUS = 0xE4B8,
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SCD4X_PERFORM_FACTORY_RESET = 0x3632,
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SCD4X_GET_SERIAL_NUMBER = 0x3682
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} scd4x_cmd_t;
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/*
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* Function prototypes
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*/
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int8_t scd4x_send_cmd(scd4x_cmd_t cmd);
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int8_t scd4x_read_data(uint8_t *buffer, int len);
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int8_t scd4x_start_periodic_measurement( void );
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int8_t scd4x_stop_periodic_measurement( void );
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int8_t scd4x_perform_factory_reset( void );
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int8_t scd4x_read_measurement(uint16_t * co2, int16_t *temperature, uint16_t *relative_humidity);
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#endif /* INC_SCD4X_H_ */
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