5427d6bbc7
During the driver init, the function will set the sensor resolution based on the driver's dts variable "resolution" The driver's device tree has been updated to include the value "resolution". The default is set to the highest resolution of 0.0625C. Moved mcp9808_reg_write from mcp9808_trigger.c to mcp9808.c This allows resue of the same function in both the trigger and resolution functions. Function name changed to xxx_16bit to distinquish it from the 8 bit write function that will added. Signed-off-by: Steven Daglish <s.c.daglish@gmail.com>
142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/*
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* Copyright (c) 2019 Peter Bigot Consulting, LLC
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* Copyright (c) 2016 Intel Corporation
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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_MCP9808_MCP9808_H_
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#define ZEPHYR_DRIVERS_SENSOR_MCP9808_MCP9808_H_
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#include <errno.h>
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#include <zephyr/types.h>
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#include <device.h>
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#include <drivers/sensor.h>
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#include <sys/util.h>
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#include <drivers/gpio.h>
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#define MCP9808_REG_CONFIG 0x01
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#define MCP9808_REG_UPPER_LIMIT 0x02
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#define MCP9808_REG_LOWER_LIMIT 0x03
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#define MCP9808_REG_CRITICAL 0x04
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#define MCP9808_REG_TEMP_AMB 0x05
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/* 16 bits control configuration and state.
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*
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* * Bit 0 controls alert signal output mode
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* * Bit 1 controls interrupt polarity
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* * Bit 2 disables upper and lower threshold checking
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* * Bit 3 enables alert signal output
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* * Bit 4 records alert status
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* * Bit 5 records interrupt status
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* * Bit 6 locks the upper/lower window registers
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* * Bit 7 locks the critical register
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* * Bit 8 enters shutdown mode
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* * Bits 9-10 control threshold hysteresis
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*/
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#define MCP9808_CFG_ALERT_MODE_INT BIT(0)
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#define MCP9808_CFG_ALERT_ENA BIT(3)
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#define MCP9808_CFG_ALERT_STATE BIT(4)
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#define MCP9808_CFG_INT_CLEAR BIT(5)
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/* 16 bits are used for temperature and state encoding:
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* * Bits 0..11 encode the temperature in a 2s complement signed value
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* in Celsius with 1/16 Cel resolution
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* * Bit 12 is set to indicate a negative temperature
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* * Bit 13 is set to indicate a temperature below the lower threshold
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* * Bit 14 is set to indicate a temperature above the upper threshold
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* * Bit 15 is set to indicate a temperature above the critical threshold
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*/
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#define MCP9808_TEMP_SCALE_CEL 16 /* signed */
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#define MCP9808_TEMP_SIGN_BIT BIT(12)
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#define MCP9808_TEMP_ABS_MASK ((uint16_t)(MCP9808_TEMP_SIGN_BIT - 1U))
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#define MCP9808_TEMP_LWR_BIT BIT(13)
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#define MCP9808_TEMP_UPR_BIT BIT(14)
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#define MCP9808_TEMP_CRT_BIT BIT(15)
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#define MCP9808_REG_RESOLUTION 0x08
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struct mcp9808_data {
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const struct device *i2c_master;
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uint16_t reg_val;
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#ifdef CONFIG_MCP9808_TRIGGER
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const struct device *alert_gpio;
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struct gpio_callback alert_cb;
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const struct device *dev;
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struct sensor_trigger trig;
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sensor_trigger_handler_t trigger_handler;
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#endif
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#ifdef CONFIG_MCP9808_TRIGGER_OWN_THREAD
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struct k_sem sem;
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#endif
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#ifdef CONFIG_MCP9808_TRIGGER_GLOBAL_THREAD
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struct k_work work;
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#endif
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};
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struct mcp9808_config {
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const char *i2c_bus;
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uint16_t i2c_addr;
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uint8_t resolution;
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#ifdef CONFIG_MCP9808_TRIGGER
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uint8_t alert_pin;
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uint8_t alert_flags;
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const char *alert_controller;
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#endif /* CONFIG_MCP9808_TRIGGER */
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};
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int mcp9808_reg_read(const struct device *dev, uint8_t reg, uint16_t *val);
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int mcp9808_reg_write_16bit(const struct device *dev, uint8_t reg,
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uint16_t val);
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int mcp9808_reg_write_8bit(const struct device *dev, uint8_t reg,
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uint8_t val);
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#ifdef CONFIG_MCP9808_TRIGGER
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int mcp9808_attr_set(const struct device *dev, enum sensor_channel chan,
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enum sensor_attribute attr,
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const struct sensor_value *val);
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int mcp9808_trigger_set(const struct device *dev,
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const struct sensor_trigger *trig,
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sensor_trigger_handler_t handler);
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int mcp9808_setup_interrupt(const struct device *dev);
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#endif /* CONFIG_MCP9808_TRIGGER */
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/* Encode a signed temperature in scaled Celsius to the format used in
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* register values.
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*/
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static inline uint16_t mcp9808_temp_reg_from_signed(int temp)
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{
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/* Get the 12-bit 2s complement value */
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uint16_t rv = temp & MCP9808_TEMP_ABS_MASK;
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if (temp < 0) {
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rv |= MCP9808_TEMP_SIGN_BIT;
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}
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return rv;
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}
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/* Decode a register temperature value to a signed temperature in
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* scaled Celsius.
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*/
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static inline int mcp9808_temp_signed_from_reg(uint16_t reg)
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{
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int rv = reg & MCP9808_TEMP_ABS_MASK;
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if (reg & MCP9808_TEMP_SIGN_BIT) {
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/* Convert 12-bit 2s complement to signed negative
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* value.
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*/
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rv = -(1U + (rv ^ MCP9808_TEMP_ABS_MASK));
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}
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return rv;
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}
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#endif /* ZEPHYR_DRIVERS_SENSOR_MCP9808_MCP9808_H_ */
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