83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
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/*
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* Copyright (c) 2021 Thomas Stranger
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_DRIVERS_SENSOR_SHTCX_SHTCX_H_
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#define ZEPHYR_DRIVERS_SENSOR_SHTCX_SHTCX_H_
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#include <device.h>
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#include <devicetree.h>
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#include <kernel.h>
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#include <drivers/gpio.h>
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/* common cmds */
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#define SHTCX_CMD_READ_ID 0xEFC8
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#define SHTCX_CMD_SOFT_RESET 0x805D
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/* shtc3 only: */
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#define SHTCX_CMD_SLEEP 0xB098
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#define SHTCX_CMD_WAKEUP 0x3517
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#define SHTCX_POWER_UP_TIME_US 240U
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/* Soft reset time is 230us for shtc1 and 240us for shtc3 */
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#define SHTCX_SOFT_RESET_TIME_US 240U
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#define SHTCX_MAX_READ_LEN 6
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#define SHTCX_WORD_LEN 2
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#define SHTCX_CRC8_LEN 1
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#define SHTC3_ID_MASK 0x083F
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#define SHTC3_ID_VALUE 0x0807
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#define SHTC1_ID_MASK 0x083F
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#define SHTC1_ID_VALUE 0x0007
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/* defines matching the related enums DT_ENUM_IDX: */
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#define CHIP_SHTC1 0
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#define CHIP_SHTC3 1
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#define MEASURE_MODE_NORMAL 0
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#define MEASURE_MODE_LOW_POWER 1
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enum shtcx_chip {
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SHTC1 = CHIP_SHTC1,
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SHTC3 = CHIP_SHTC3,
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};
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enum shtcx_measure_mode {
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NORMAL = MEASURE_MODE_NORMAL,
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LOW_POWER = MEASURE_MODE_LOW_POWER,
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};
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struct shtcx_sample {
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uint16_t temp;
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uint16_t humidity;
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} __packed __aligned(2);
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struct shtcx_config {
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const struct device *bus;
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uint8_t base_address;
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enum shtcx_chip chip;
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enum shtcx_measure_mode measure_mode;
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bool clock_stretching;
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};
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struct shtcx_data {
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struct shtcx_sample sample;
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};
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static inline uint8_t shtcx_i2c_address(const struct device *dev)
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{
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const struct shtcx_config *dcp = dev->config;
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return dcp->base_address;
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}
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static inline const struct device *shtcx_i2c_bus(const struct device *dev)
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{
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const struct shtcx_config *dcp = dev->config;
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return dcp->bus;
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}
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#endif /* ZEPHYR_DRIVERS_SENSOR_SHTCX_SHTCX_H_ */
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