5379f4a16b
Previously, the TMP1075 driver only used the integer part (val1) of the sensor_value when setting TLOW and THIGH thresholds. This limited the precision of temperature threshold configuration and could be insufficient in applications requiring fine-grained control. This patch adds proper handling for the fractional part (val2) by encoding it into bits [7:4] of the 12-bit temperature register according to the TMP1075 datasheet. The decoding logic in get_threshold_attribute() is also updated to recover the fractional value accurately. Signed-off-by: Hank Wang <wanghanchi2000@gmail.com>
80 lines
2.8 KiB
C
80 lines
2.8 KiB
C
/*
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* Copyright (c) 2024 Arrow Electronics.
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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_TMP1075_TMP1075_H_
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#define ZEPHYR_DRIVERS_SENSOR_TMP1075_TMP1075_H_
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#include <zephyr/device.h>
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#include <zephyr/sys/util.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/drivers/i2c.h>
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/* Extended resolution is not supported on TMP1075 */
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#define TMP1075_DATA_NORMAL_SHIFT 4
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#define TMP1075_DATA_FRAC_SHIFT 4
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#define TMP1075_DATA_FRAC_MASK 0x00F0
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#define TMP1075_DATA_INTE_SHIFT 8
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#define TMP1075_DATA_INTE_MASK 0xFF00
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#define uCELSIUS_IN_CELSIUS 1000000
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#define TMP1075_REG_TEMPERATURE 0x00
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#define TMP1075_REG_CONFIG 0x01
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#define TMP1075_REG_TLOW 0x02
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#define TMP1075_REG_THIGH 0x03
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/* Scale in micro degrees Celsius -> 0.0625°C per ADC bit resolution */
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#define TMP1075_TEMP_SCALE 62500
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/* Macro to set or clear the TMP1075_OS (One-shot conversion mode) bit based on a boolean value */
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#define TMP1075_SET_ONE_SHOT_CONVERSION(reg, enable) \
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((reg) = ((reg) & ~(1 << 15)) | ((enable) << 15))
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/* Macro to set the TMP1075_R (Conversion rate) bits */
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#define TMP1075_SET_CONVERSION_RATE(reg, rate) ((reg) |= ((rate) << 13))
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/* Macro to set the TMP1075_F (Consecutive fault measurements) bits */
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#define TMP1075_SET_CONSECUTIVE_FAULT_MEASUREMENTS(reg, faults) ((reg) |= ((faults) << 11))
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/* Macro to set or clear the TMP1075_POL (Polarity of output pin) bit based on a boolean value */
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#define TMP1075_SET_ALERT_PIN_POLARITY(reg, activeHigh) \
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((reg) = ((reg) & ~(1 << 10)) | ((activeHigh) << 10))
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/* Macro to set or clear the TMP1075_TM (ALERT pin function) bit based on a boolean value */
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#define TMP1075_SET_ALERT_PIN_FUNCTION(reg, interruptMode) \
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((reg) = ((reg) & ~(1 << 9)) | ((interruptMode) << 9))
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/* Macro to set or clear the TMP1075_SD (Shutdown mode) bit based on a boolean value */
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#define TMP1075_SET_SHUTDOWN_MODE(reg, shutdown) ((reg) = ((reg) & ~(1 << 8)) | ((shutdown) << 8))
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struct tmp1075_data {
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const struct device *tmp1075_dev;
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int16_t sample;
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uint16_t config_reg;
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const struct sensor_trigger *temp_alert_trigger;
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sensor_trigger_handler_t temp_alert_handler;
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struct gpio_callback temp_alert_gpio_cb;
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bool over_threshold;
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};
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struct tmp1075_config {
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const struct i2c_dt_spec bus;
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const struct gpio_dt_spec alert_gpio;
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uint8_t cr;
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uint8_t cf;
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bool alert_pol: 1;
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bool one_shot: 1;
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bool interrupt_mode: 1;
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bool shutdown_mode: 1;
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};
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int tmp1075_trigger_set(const struct device *dev, const struct sensor_trigger *trig,
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sensor_trigger_handler_t handler);
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void tmp1075_trigger_handle_alert(const struct device *port, struct gpio_callback *cb,
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gpio_port_pins_t pins);
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#endif
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