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drivers: sensor: lm73c: Added TI LM73C sensor driver #31064

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drivers: sensor: lm73c: Added TI LM73C sensor driver #31064

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1 change: 1 addition & 0 deletions drivers/sensor/CMakeLists.txt
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Expand Up @@ -39,6 +39,7 @@ add_subdirectory_ifdef(CONFIG_LIS2DS12 lis2ds12)
add_subdirectory_ifdef(CONFIG_LIS2DW12 lis2dw12)
add_subdirectory_ifdef(CONFIG_LIS2MDL lis2mdl)
add_subdirectory_ifdef(CONFIG_LIS3MDL lis3mdl)
add_subdirectory_ifdef(CONFIG_LM73C lm73c)
add_subdirectory_ifdef(CONFIG_LPS22HB lps22hb)
add_subdirectory_ifdef(CONFIG_LPS22HH lps22hh)
add_subdirectory_ifdef(CONFIG_LPS25HB lps25hb)
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2 changes: 2 additions & 0 deletions drivers/sensor/Kconfig
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Expand Up @@ -116,6 +116,8 @@ source "drivers/sensor/lis2mdl/Kconfig"

source "drivers/sensor/lis3mdl/Kconfig"

source "drivers/sensor/lm73c/Kconfig"

source "drivers/sensor/lps22hb/Kconfig"

source "drivers/sensor/lps22hh/Kconfig"
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5 changes: 5 additions & 0 deletions drivers/sensor/lm73c/CMakeLists.txt
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# SPDX-License-Identifier: Apache-2.0

zephyr_library()

zephyr_library_sources_ifdef(CONFIG_LM73C lm73c.c)
27 changes: 27 additions & 0 deletions drivers/sensor/lm73c/Kconfig
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# Copyright (c) 2020 SER Consulting LLC
# SPDX-License-Identifier: Apache-2.0

menuconfig LM73C
bool "LM73C Temperature Sensor"
depends on I2C
help
Enable I2C-based driver for LM73C Temperature Sensor.

if LM73C

choice
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prompt "LM73C temperature precision"
default LM73C_TEMP_PREC_1_32
help
Select temperature precision for the LM73C sensor.
config LM73C_TEMP_PREC_1_4
bool "0.25"
config LM73C_TEMP_PREC_1_8
bool "0.125"
config LM73C_TEMP_PREC_1_16
bool "0.0625"
config LM73C_TEMP_PREC_1_32
bool "0.03125"
endchoice

endif # LM73C
138 changes: 138 additions & 0 deletions drivers/sensor/lm73c/doc/LM73CIMK-0.lbr
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<!--This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA) with Design Exception 1.0-->
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<eagle version="7.1.0">
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Binary file added drivers/sensor/lm73c/doc/lm73.pdf
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156 changes: 156 additions & 0 deletions drivers/sensor/lm73c/lm73c.c
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/*
* Copyright (c) 2020 SER Consulting LLC
*
* SPDX-License-Identifier: Apache-2.0
*/

#include <drivers/sensor.h>
#include <kernel.h>
#include <device.h>
#include <logging/log.h>
#include <drivers/i2c.h>
#include "lm73c.h"

#define DT_DRV_COMPAT ti_lm73c

#define LM73C_BUS_I2C DT_ANY_INST_ON_BUS_STATUS_OKAY(i2c)

LOG_MODULE_REGISTER(LM73C, CONFIG_SENSOR_LOG_LEVEL);

#if DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) == 0
#warning "LM73C driver enabled without any devices"
#endif


struct lm73c_data {
const struct device *i2c_dev;
uint16_t temperature;
};

/**
* @brief fetch a sample from the sensor
*
* @return 0
*/
static int lm73c_sample_fetch(const struct device *dev,
enum sensor_channel chan)
{
int retval;
struct lm73c_data *lm73_data = dev->data;
uint8_t temp[2];

retval = i2c_burst_read(lm73_data->i2c_dev,
DT_INST_REG_ADDR(0),
LM73_REG_TEMP,
temp, sizeof(temp));

if (retval == 0) {
lm73_data->temperature = (temp[0] << 8) | temp[1];
} else {
LOG_ERR("lm73c read register err");
}

return retval;
}

/**
* @brief sensor value get
*
* @return -ENOTSUP for unsupported channels
*/
static int lm73c_channel_get(const struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct lm73c_data *lm73_data = dev->data;

if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
return -ENOTSUP;
}
int32_t temp = (int32_t)lm73_data->temperature;
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if (temp > 0x7fff) {
temp -= 0x8000;
}
temp = (temp >> 2) * 31250;
val->val1 = temp / 1000000;
val->val2 = temp % 1000000;
return 0;
}

static const struct sensor_driver_api lm73c_api = {
.sample_fetch = &lm73c_sample_fetch,
.channel_get = &lm73c_channel_get,
};

/**
* @brief initialize the sensor
*
* @return 0 for success
*/

static int lm73c_init(const struct device *dev)
{
const char *name = dev->name;
struct lm73c_data *drv_data = dev->data;

LOG_DBG("%s: Initializing", name);

drv_data->i2c_dev = device_get_binding(
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DT_INST_BUS_LABEL(0));

if (!drv_data->i2c_dev) {
LOG_DBG("%s: i2c master not found: 0", name);
return -EINVAL;
}

int retval;
uint8_t temp[2];
uint16_t id;

retval = i2c_burst_read(drv_data->i2c_dev,
DT_INST_REG_ADDR(0),
LM73_REG_ID,
temp, sizeof(temp));
if (retval == 0) {
id = (temp[0] << 8) | temp[1];
LOG_DBG("%s: id (0x0190) = %x", name, id);

/* set resolution to .03125 deg C */
temp[0] = LM73_TEMP_PREC;
retval = i2c_burst_write(drv_data->i2c_dev,
DT_INST_REG_ADDR(0),
LM73_REG_CTRL,
temp, 1);
if (retval == 0) {
/* kick off the first read */
retval = i2c_burst_read(drv_data->i2c_dev,
DT_INST_REG_ADDR(0),
LM73_REG_TEMP,
temp, sizeof(temp));
if (retval == 0) {
drv_data->temperature =
(temp[0] << 8) | temp[1];
} else {
LOG_ERR("%s: First temp read err",
name);
return -EINVAL;
}
} else {
LOG_ERR("%s: Set resolution err",
name);
return -EINVAL;
}
} else {
LOG_ERR("%s: Read ID register err", name);
return -EINVAL;
}
LOG_DBG("%s: Initialized", name);
return 0;
}

static struct lm73c_data lm73_data;

DEVICE_AND_API_INIT(lm73c, DT_INST_LABEL(0), lm73c_init,
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&lm73_data, NULL, POST_KERNEL,
CONFIG_SENSOR_INIT_PRIORITY, &lm73c_api);
30 changes: 30 additions & 0 deletions drivers/sensor/lm73c/lm73c.h
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/*
* Copyright (c) 2020 SER Consulting LLC
*
* SPDX-License-Identifier: Apache-2.0
*/

#ifndef _LM73C_H
#define _LM73C_H

/* LM73 registers */
#define LM73_REG_TEMP 0x00
#define LM73_REG_CONF 0x01
#define LM73_REG_THIGH 0x02
#define LM73_REG_TLOW 0x03
#define LM73_REG_CTRL 0x04
#define LM73_REG_ID 0x07

#define LM73_ID 0x9001

#if defined CONFIG_LM73C_TEMP_PREC_1_4
#define LM73_TEMP_PREC (0x00)
#elif defined CONFIG_LM73C_TEMP_PREC_1_8
#define LM73_TEMP_PREC (0x20)
#elif defined CONFIG_LM73C_TEMP_PREC_1_16
#define LM73_TEMP_PREC (0x40)
#elif defined CONFIG_LM73C_TEMP_PREC_1_32
#define LM73_TEMP_PREC (0x60)
#endif

#endif /* _LM73C_H */
8 changes: 8 additions & 0 deletions samples/sensor/lm73c/CMakeLists.txt
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# SPDX-License-Identifier: Apache-2.0

cmake_minimum_required(VERSION 3.13.1)
find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
project(lm73c)

FILE(GLOB app_sources src/*.c)
target_sources(app PRIVATE ${app_sources})
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