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drivers: sensors: Added MS5837 driver

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Added MS5837 pressure sensor driver

Signed-off-by: Jan Van Winkel <jan.van_winkel@dxplore.eu>
This commit is contained in:
Jan Van Winkel 2018-04-29 18:04:33 +02:00 • committed by Maureen Helm
commit db9403def5
7 changed files with 455 additions and 0 deletions
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1
drivers/sensor/CMakeLists.txt
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@ -34,6 +34,7 @@ add_subdirectory_ifdef(CONFIG_MAX44009 max44009)
add_subdirectory_ifdef(CONFIG_MCP9808 mcp9808)
add_subdirectory_ifdef(CONFIG_MMA8451Q mma8451q)
add_subdirectory_ifdef(CONFIG_MPU6050 mpu6050)
add_subdirectory_ifdef(CONFIG_MS5837 ms5837)
add_subdirectory_ifdef(CONFIG_PMS7003 pms7003)
add_subdirectory_ifdef(CONFIG_TEMP_NRF5 nrf5)
add_subdirectory_ifdef(CONFIG_SHT3XD sht3xd)

2
drivers/sensor/Kconfig
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@ -107,6 +107,8 @@ source "drivers/sensor/mma8451q/Kconfig"
source "drivers/sensor/mpu6050/Kconfig"
source "drivers/sensor/ms5837/Kconfig"
source "drivers/sensor/nrf5/Kconfig"
source "drivers/sensor/pms7003/Kconfig"

9
drivers/sensor/ms5837/CMakeLists.txt Normal file
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@ -0,0 +1,9 @@
#
# Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
#
# SPDX-License-Identifier: Apache-2.0
#
zephyr_sources(
ms5837.c
)

14
drivers/sensor/ms5837/Kconfig Normal file
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@ -0,0 +1,14 @@
# MS5837 pressure sensor configuration options
#
# Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
#
#
# SPDX-License-Identifier: Apache-2.0
#
config MS5837
bool "MS5837 pressure and temperature sensor"
depends on I2C && HAS_DTS_I2C
help
Enable driver for MS5837 pressure and temperature sensor.

323
drivers/sensor/ms5837/ms5837.c Normal file
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@ -0,0 +1,323 @@
/* Driver for MS5837 pressure sensor
*
* Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <init.h>
#include <kernel.h>
#include <misc/byteorder.h>
#include <sensor.h>
#include <misc/__assert.h>
#include "ms5837.h"
static int ms5837_get_measurement(struct device *i2c_master,
const u8_t i2c_address, u32_t *val,
u8_t cmd, const u8_t delay)
{
u8_t adc_read_cmd = MS5837_CMD_CONV_READ_ADC;
int err;
*val = 0;
err = i2c_write(i2c_master, &cmd, 1, i2c_address);
if (err < 0) {
return err;
}
k_sleep(delay);
err = i2c_burst_read(i2c_master, i2c_address, adc_read_cmd,
((u8_t *)val) + 1, 3);
if (err < 0) {
return err;
}
*val = sys_be32_to_cpu(*val);
return 0;
}
static void ms5837_compensate(struct ms5837_data *data,
const s32_t adc_temperature,
const s32_t adc_pressure)
{
s64_t dT;
s64_t OFF;
s64_t SENS;
s64_t temp_sq;
s32_t Ti;
s32_t OFFi;
s32_t SENSi;
/* first order compensation as per datasheet
* (https://www.te.com/usa-en/product-CAT-BLPS0017.html) section
* PRESSURE AND TEMPERATURE CALCULATION
*/
dT = adc_temperature - ((u32_t)(data->t_ref) << 8);
data->temperature = 2000 + (dT * data->tempsens) / (1ll << 23);
OFF = ((s64_t)(data->off_t1) << 16) + (dT * data->tco) / (1ll << 7);
SENS = ((s64_t)(data->sens_t1) << 15) + (dT * data->tcs) / (1ll << 8);
/* Second order compensation as per datasheet
* (https://www.te.com/usa-en/product-CAT-BLPS0017.html) section
* SECOND ORDER TEMPERATURE COMPENSATION
*/
temp_sq = (data->temperature - 2000) * (data->temperature - 2000);
if (data->temperature < 2000) {
Ti = (3ll * dT * dT) / (1ll << 23);
OFFi = (3ll * temp_sq) / 1ll;
SENSi = (5ll * temp_sq) / (1ll << 3);
if (data->temperature < -1500) {
temp_sq = (data->temperature + 1500) *
(data->temperature + 1500);
OFFi += 7ll * temp_sq;
SENSi += 5ll * temp_sq;
}
} else {
Ti = (1ll * dT * dT) / (1ll << 37);
OFFi = temp_sq / (1ll << 4);
SENSi = 0;
}
OFF -= OFFi;
SENS -= SENSi;
data->temperature -= Ti;
data->pressure =
(((SENS * adc_pressure) / (1ll << 21)) - OFF) / (1ll << 13);
}
static int ms5837_sample_fetch(struct device *dev, enum sensor_channel channel)
{
struct ms5837_data *data = dev->driver_data;
const struct ms5837_config *cfg = dev->config->config_info;
int err;
u32_t adc_pressure;
u32_t adc_temperature;
__ASSERT_NO_MSG(channel == SENSOR_CHAN_ALL);
err = ms5837_get_measurement(data->i2c_master, cfg->i2c_address,
&adc_pressure,
data->presure_conv_cmd,
data->presure_conv_delay);
if (err < 0) {
return err;
}
err = ms5837_get_measurement(data->i2c_master, cfg->i2c_address,
&adc_temperature,
data->temperature_conv_cmd,
data->temperature_conv_delay);
if (err < 0) {
return err;
}
ms5837_compensate(data, adc_temperature, adc_pressure);
return 0;
}
static int ms5837_channel_get(struct device *dev, enum sensor_channel chan,
struct sensor_value *val)
{
struct ms5837_data *data = dev->driver_data;
switch (chan) {
case SENSOR_CHAN_AMBIENT_TEMP:
val->val1 = data->temperature / 100;
val->val2 = data->temperature % 100 * 10000;
break;
case SENSOR_CHAN_PRESS:
val->val1 = data->pressure / 100;
val->val2 = data->pressure % 100 * 10000;
break;
default:
return -EINVAL;
}
return 0;
}
static int ms5837_attr_set(struct device *dev, enum sensor_channel chan,
enum sensor_attribute attr,
const struct sensor_value *val)
{
struct ms5837_data *data = dev->driver_data;
u8_t p_conv_cmd;
u8_t t_conv_cmd;
u8_t conv_delay;
if (attr == SENSOR_ATTR_OVERSAMPLING) {
switch (val->val1) {
case 8192:
p_conv_cmd = MS5837_CMD_CONV_P_8192;
t_conv_cmd = MS5837_CMD_CONV_T_8192;
conv_delay = 19;
break;
case 4096:
p_conv_cmd = MS5837_CMD_CONV_P_4096;
t_conv_cmd = MS5837_CMD_CONV_T_4096;
conv_delay = 10;
break;
case 2048:
p_conv_cmd = MS5837_CMD_CONV_P_2048;
t_conv_cmd = MS5837_CMD_CONV_T_2048;
conv_delay = 5;
break;
case 1024:
p_conv_cmd = MS5837_CMD_CONV_P_1024;
t_conv_cmd = MS5837_CMD_CONV_T_1024;
conv_delay = 3;
break;
case 512:
p_conv_cmd = MS5837_CMD_CONV_P_512;
t_conv_cmd = MS5837_CMD_CONV_T_512;
conv_delay = 2;
break;
case 256:
p_conv_cmd = MS5837_CMD_CONV_P_256;
t_conv_cmd = MS5837_CMD_CONV_T_256;
conv_delay = 1;
break;
default:
SYS_LOG_ERR("invalid oversampling rate %d", val->val1);
return -EINVAL;
}
if (chan == SENSOR_CHAN_ALL) {
data->presure_conv_cmd = p_conv_cmd;
data->presure_conv_delay = conv_delay;
data->temperature_conv_cmd = t_conv_cmd;
data->temperature_conv_delay = conv_delay;
return 0;
}
if (chan == SENSOR_CHAN_PRESS) {
data->presure_conv_cmd = p_conv_cmd;
data->presure_conv_delay = conv_delay;
return 0;
}
if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
data->temperature_conv_cmd = t_conv_cmd;
data->temperature_conv_delay = conv_delay;
return 0;
}
return -ENOTSUP;
}
return -ENOTSUP;
}
static const struct sensor_driver_api ms5837_api_funcs = {
.attr_set = ms5837_attr_set,
.sample_fetch = ms5837_sample_fetch,
.channel_get = ms5837_channel_get,
};
static int ms5837_read_prom(struct device *i2c_master, const u8_t i2c_address,
const u8_t cmd, u16_t *val)
{
int err;
err = i2c_burst_read(i2c_master, i2c_address, cmd, (u8_t *)val, 2);
if (err < 0) {
return err;
}
*val = sys_be16_to_cpu(*val);
return 0;
}
static int ms5837_init(struct device *dev)
{
struct ms5837_data *data = dev->driver_data;
const struct ms5837_config *cfg = dev->config->config_info;
int err;
u8_t cmd;
data->pressure = 0;
data->temperature = 0;
data->presure_conv_cmd = MS5837_CMD_CONV_P_256;
data->presure_conv_delay = 1;
data->temperature_conv_cmd = MS5837_CMD_CONV_T_256;
data->temperature_conv_delay = 1;
data->i2c_master = device_get_binding(cfg->i2c_name);
if (data->i2c_master == NULL) {
SYS_LOG_ERR("i2c master %s not found",
CONFIG_MS5837_I2C_MASTER_DEV_NAME);
return -EINVAL;
}
cmd = MS5837_CMD_RESET;
err = i2c_write(data->i2c_master, &cmd, 1, cfg->i2c_address);
if (err < 0) {
return err;
}
err = ms5837_read_prom(data->i2c_master, cfg->i2c_address,
MS5837_CMD_CONV_READ_SENS_T1,
&data->sens_t1);
if (err < 0) {
return err;
}
err = ms5837_read_prom(data->i2c_master, cfg->i2c_address,
MS5837_CMD_CONV_READ_OFF_T1,
&data->off_t1);
if (err < 0) {
return err;
}
err = ms5837_read_prom(data->i2c_master, cfg->i2c_address,
MS5837_CMD_CONV_READ_TCS,
&data->tcs);
if (err < 0) {
return err;
}
err = ms5837_read_prom(data->i2c_master, cfg->i2c_address,
MS5837_CMD_CONV_READ_TCO,
&data->tco);
if (err < 0) {
return err;
}
err = ms5837_read_prom(data->i2c_master, cfg->i2c_address,
MS5837_CMD_CONV_READ_T_REF,
&data->t_ref);
if (err < 0) {
return err;
}
err = ms5837_read_prom(data->i2c_master, cfg->i2c_address,
MS5837_CMD_CONV_READ_TEMPSENS,
&data->tempsens);
if (err < 0) {
return err;
}
return 0;
}
static struct ms5837_data ms5837_data;
static const struct ms5837_config ms5837_config = {
.i2c_name = CONFIG_MS5837_I2C_MASTER_DEV_NAME,
.i2c_address = MS5837_ADDR
};
DEVICE_AND_API_INIT(ms5837, CONFIG_MS5837_DEV_NAME, ms5837_init, &ms5837_data,
&ms5837_config, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY,
&ms5837_api_funcs);

84
drivers/sensor/ms5837/ms5837.h Normal file
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@ -0,0 +1,84 @@
/*
* Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __SENSOR_MS5837_H__
#define __SENSOR_MS5837_H__
#include <zephyr/types.h>
#include <device.h>
#include <i2c.h>
#define MS5837_ADDR 0x76
#define MS5837_CMD_RESET 0x1E
#define MS5837_CMD_CONV_P_256 0x40
#define MS5837_CMD_CONV_P_512 0x42
#define MS5837_CMD_CONV_P_1024 0x44
#define MS5837_CMD_CONV_P_2048 0x46
#define MS5837_CMD_CONV_P_4096 0x48
#define MS5837_CMD_CONV_P_8192 0x4A
#define MS5837_CMD_CONV_T_256 0x50
#define MS5837_CMD_CONV_T_512 0x52
#define MS5837_CMD_CONV_T_1024 0x54
#define MS5837_CMD_CONV_T_2048 0x56
#define MS5837_CMD_CONV_T_4096 0x58
#define MS5837_CMD_CONV_T_8192 0x5A
#define MS5837_CMD_CONV_READ_ADC 0x00
#define MS5837_CMD_CONV_READ_CRC 0xA0
#define MS5837_CMD_CONV_READ_SENS_T1 0xA2
#define MS5837_CMD_CONV_READ_OFF_T1 0xA4
#define MS5837_CMD_CONV_READ_TCS 0xA6
#define MS5837_CMD_CONV_READ_TCO 0xA8
#define MS5837_CMD_CONV_READ_T_REF 0xAA
#define MS5837_CMD_CONV_READ_TEMPSENS 0xAC
#define MS5837_ADC_READ_DELAY_256 1
#define MS5837_ADC_READ_DELAY_512 2
#define MS5837_ADC_READ_DELAY_1024 3
#define MS5837_ADC_READ_DELAY_2048 5
#define MS5837_ADC_READ_DELAY_4086 10
#define MS5837_ADC_READ_DELAY_8129 20
struct ms5837_data {
struct device *i2c_master;
/* Calibration values */
u16_t sens_t1;
u16_t off_t1;
u16_t tcs;
u16_t tco;
u16_t t_ref;
u16_t tempsens;
/* Measured values */
s32_t pressure;
s32_t temperature;
/* Conversion commands */
u8_t presure_conv_cmd;
u8_t temperature_conv_cmd;
/* Conversion delay in ms*/
u8_t presure_conv_delay;
u8_t temperature_conv_delay;
};
struct ms5837_config {
const char *i2c_name;
u8_t i2c_address;
};
#define SYS_LOG_DOMAIN "MS5837"
#define SYS_LOG_LEVEL CONFIG_SYS_LOG_SENSOR_LEVEL
#include <logging/sys_log.h>
#endif /* __SENSOR_MS5837_H__ */

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dts/bindings/sensor/meas,ms5837.yaml Normal file
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@ -0,0 +1,22 @@
#
# Copyright (c) 2018, Jan Van Winkel <jan.van_winkel@dxplore.eu>
#
# SPDX-License-Identifier: Apache-2.0
#
---
title: TE Connectivity digital pressure sensor MS5837
id: meas,ms5837
version: 0.1
description: >
This binding gives a base representation of the MS5837 digital pressure
sensor
inherits:
!include i2c-device.yaml
properties:
compatible:
constraint: "meas,ms5837"
...