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Sensor: mpr: Add Honeywell MPR driver
The Honeywell MPR sensor is a piezoresistive silicon pressure sensor, which can be accessed via i2c. https://sensing.honeywell.com/micropressure-mpr-series Signed-off-by: Sven Herrmann <[email protected]>
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‎drivers/sensor/CMakeLists.txt‎

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@@ -48,6 +48,7 @@ add_subdirectory_ifdef(CONFIG_LSM9DS0_MFD lsm9ds0_mfd)
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add_subdirectory_ifdef(CONFIG_MAX30101 max30101)
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add_subdirectory_ifdef(CONFIG_MAX44009 max44009)
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add_subdirectory_ifdef(CONFIG_MCP9808 mcp9808)
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add_subdirectory_ifdef(CONFIG_MPR mpr)
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add_subdirectory_ifdef(CONFIG_MPU6050 mpu6050)
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add_subdirectory_ifdef(CONFIG_MS5607 ms5607)
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add_subdirectory_ifdef(CONFIG_MS5837 ms5837)

‎drivers/sensor/Kconfig‎

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@@ -127,6 +127,8 @@ source "drivers/sensor/mchp_tach_xec/Kconfig"
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source "drivers/sensor/mcp9808/Kconfig"
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source "drivers/sensor/mpr/Kconfig"
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source "drivers/sensor/mpu6050/Kconfig"
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source "drivers/sensor/ms5837/Kconfig"

‎drivers/sensor/mpr/CMakeLists.txt‎

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# SPDX-License-Identifier: Apache-2.0
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zephyr_library()
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zephyr_library_sources_ifdef(CONFIG_MPR mpr.c)

‎drivers/sensor/mpr/Kconfig‎

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# MPR pressure sensor configuration options
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# Copyright (c) 2020 Sven Herrmann
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# SPDX-License-Identifier: Apache-2.0
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menuconfig MPR
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bool "MPR pressure sensor"
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depends on I2C && HAS_DTS_I2C
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help
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Enable driver for MPR pressure sensor.
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if MPR
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choice
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prompt "MPR Pressure Range"
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default MPR_PRESSURE_RANGE_0025
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config MPR_PRESSURE_RANGE_0001
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bool "0 to 1"
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config MPR_PRESSURE_RANGE_01_6
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bool "0 to 1.6"
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config MPR_PRESSURE_RANGE_02_5
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bool "0 to 2.5"
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config MPR_PRESSURE_RANGE_0015
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bool "0 to 15"
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config MPR_PRESSURE_RANGE_0025
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bool "0 to 25"
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config MPR_PRESSURE_RANGE_0030
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bool "0 to 30"
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config MPR_PRESSURE_RANGE_0060
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bool "0 to 60"
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config MPR_PRESSURE_RANGE_0100
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bool "0 to 100"
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config MPR_PRESSURE_RANGE_0160
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bool "0 to 160"
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config MPR_PRESSURE_RANGE_0250
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bool "0 to 250"
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config MPR_PRESSURE_RANGE_0400
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bool "0 to 400"
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config MPR_PRESSURE_RANGE_0600
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bool "0 to 600"
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endchoice
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choice
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prompt "MPR Pressure Unit"
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default MPR_PRESSURE_UNIT_P
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config MPR_PRESSURE_UNIT_P
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bool "psi"
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config MPR_PRESSURE_UNIT_K
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bool "kPa"
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config MPR_PRESSURE_UNIT_B
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bool "bar"
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config MPR_PRESSURE_UNIT_M
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bool "mbar"
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endchoice
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choice
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prompt "MPR Transfer Function"
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default MPR_TRANSFER_FUNCTION_A
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config MPR_TRANSFER_FUNCTION_A
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bool "A"
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config MPR_TRANSFER_FUNCTION_B
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bool "B"
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config MPR_TRANSFER_FUNCTION_C
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bool "C"
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endchoice
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endif # MPR

‎drivers/sensor/mpr/mpr.c‎

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/* mpr.c - Driver for Honeywell MPR pressure sensor series */
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/*
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* Copyright (c) 2020 Sven Herrmann
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT honeywell_mpr
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#include <errno.h>
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#include <kernel.h>
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#include <sys/__assert.h>
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#include <drivers/sensor.h>
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#include <drivers/i2c.h>
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#include <sys/byteorder.h>
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#include <init.h>
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#include <logging/log.h>
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#include "mpr.h"
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#include "mpr_configuration.h"
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LOG_MODULE_REGISTER(MPR, CONFIG_SENSOR_LOG_LEVEL);
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static int mpr_init(struct device *dev)
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{
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struct mpr_data *data = dev->driver_data;
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const struct mpr_config *cfg = dev->config->config_info;
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data->i2c_master = device_get_binding(cfg->i2c_bus);
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if (!data->i2c_master) {
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LOG_ERR("mpr: i2c master not found: %s", cfg->i2c_bus);
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return -EINVAL;
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}
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return 0;
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}
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static int mpr_read_reg(struct device *dev)
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{
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struct mpr_data *data = dev->driver_data;
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const struct mpr_config *cfg = dev->config->config_info;
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u8_t write_buf[] = { MPR_OUTPUT_MEASUREMENT_COMMAND, 0x00, 0x00 };
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u8_t read_buf[4] = { 0x0 };
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int rc = i2c_write(data->i2c_master, write_buf, sizeof(write_buf),
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cfg->i2c_addr);
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if (rc < 0) {
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return rc;
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}
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u8_t retries = MPR_REG_READ_MAX_RETRIES;
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for (; retries > 0; retries--) {
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k_sleep(K_MSEC(MPR_REG_READ_DATA_CONV_DELAY_MS));
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rc = i2c_read(data->i2c_master, read_buf, sizeof(read_buf),
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cfg->i2c_addr);
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if (rc < 0) {
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return rc;
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}
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if (!(*read_buf & MPR_STATUS_MASK_POWER_ON)
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|| (*read_buf & MPR_STATUS_MASK_INTEGRITY_TEST_FAILED)
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|| (*read_buf & MPR_STATUS_MASK_MATH_SATURATION)) {
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return -EIO;
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}
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if (!(*read_buf & MPR_STATUS_MASK_BUSY)) {
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break;
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}
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}
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if (retries == 0) {
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return -EIO;
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}
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data->reg_val = (read_buf[1] << 16)
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| (read_buf[2] << 8)
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| read_buf[3];
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return 0;
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}
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/* (reg_value - out_min) * (p_max - p_min)
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* pressure = --------------------------------------- + p_min
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* out_max - out_min
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*
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* returns pressure [kPa] * 10^6
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*/
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static inline void mpr_convert_reg(const u32_t *reg, s64_t *value)
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{
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*value = (*reg - MPR_OUTPUT_MIN) * (MPR_P_MAX - MPR_P_MIN);
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*value *= MPR_CONVERSION_FACTOR;
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*value /= MPR_OUTPUT_RANGE;
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*value += MPR_P_MIN;
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}
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static int mpr_sample_fetch(struct device *dev, enum sensor_channel chan)
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{
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_PRESS);
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return mpr_read_reg(dev);
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}
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static int mpr_channel_get(struct device *dev,
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enum sensor_channel chan,
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struct sensor_value *val)
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{
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const struct mpr_data *data = dev->driver_data;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_PRESS);
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s64_t value;
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mpr_convert_reg(&data->reg_val, &value);
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val->val1 = value / 1000000;
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val->val2 = value % 1000000;
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return 0;
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}
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static const struct sensor_driver_api mpr_api_funcs = {
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.sample_fetch = mpr_sample_fetch,
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.channel_get = mpr_channel_get,
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};
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static struct mpr_data mpr_data;
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static const struct mpr_config mpr_cfg = {
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.i2c_bus = DT_INST_BUS_LABEL(0),
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.i2c_addr = DT_INST_REG_ADDR(0),
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};
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DEVICE_AND_API_INIT(mpr, DT_INST_LABEL(0), mpr_init, &mpr_data,
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&mpr_cfg, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY,
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&mpr_api_funcs);

‎drivers/sensor/mpr/mpr.h‎

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/*
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* Copyright (c) 2020 Sven Herrmann
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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_MPR_H_
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#define ZEPHYR_DRIVERS_SENSOR_MPR_H_
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/* MPR output measurement command */
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#define MPR_OUTPUT_MEASUREMENT_COMMAND (0xAA)
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/* MPR status byte masks */
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#define MPR_STATUS_MASK_MATH_SATURATION (0x01)
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#define MPR_STATUS_MASK_INTEGRITY_TEST_FAILED (0x04)
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#define MPR_STATUS_MASK_BUSY (0x20)
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#define MPR_STATUS_MASK_POWER_ON (0x40)
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/* MPR register read maximum retries */
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#ifndef MPR_REG_READ_MAX_RETRIES
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#define MPR_REG_READ_MAX_RETRIES (3)
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#endif
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/* MPR register read data conversion delay [ms] */
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#ifndef MPR_REG_READ_DATA_CONV_DELAY_MS
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#define MPR_REG_READ_DATA_CONV_DELAY_MS (5)
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#endif
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struct mpr_data {
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struct device *i2c_master;
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u32_t reg_val;
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};
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struct mpr_config {
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const char *i2c_bus;
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u16_t i2c_addr;
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};
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int mpr_reg_read(struct device *dev, u8_t reg, u16_t *val);
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#endif /* ZEPHYR_DRIVERS_SENSOR_MPR_H_ */

‎drivers/sensor/mpr/mpr_configuration.h‎

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/*
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* Copyright (c) 2020 Sven Herrmann
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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_MPR_CONFIGURATION_H_
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#define ZEPHYR_DRIVERS_SENSOR_MPR_CONFIGURATION_H_
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/*
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* Pressure Range
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*
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* MIN is always 0
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*/
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#define MPR_P_MIN (0)
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#if defined(CONFIG_MPR_PRESSURE_RANGE_0001)
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#define MPR_P_MAX (1)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_01_6)
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#define MPR_P_MAX (1.6)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_02_5)
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#define MPR_P_MAX (2.5)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_0015)
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#define MPR_P_MAX (15)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_0025)
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#define MPR_P_MAX (25)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_0030)
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#define MPR_P_MAX (30)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_0060)
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#define MPR_P_MAX (60)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_0100)
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#define MPR_P_MAX (100)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_0160)
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#define MPR_P_MAX (160)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_0250)
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#define MPR_P_MAX (250)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_0400)
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#define MPR_P_MAX (400)
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#elif defined(CONFIG_MPR_PRESSURE_RANGE_0600)
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#define MPR_P_MAX (600)
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#else
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#error "MPR: Unknown pressure range."
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#endif
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/*
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* Pressure Unit
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*/
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#if defined(CONFIG_MPR_PRESSURE_UNIT_P)
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/* psi to kPa conversion factor: 6.894757 * 10^6 */
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#define MPR_CONVERSION_FACTOR (6894757)
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#elif defined(CONFIG_MPR_PRESSURE_UNIT_K)
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/* kPa to kPa conversion factor: 1 * 10^6 */
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#define MPR_CONVERSION_FACTOR (1000000)
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#elif defined(CONFIG_MPR_PRESSURE_UNIT_B)
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/* bar to kPa conversion factor: 100 * 10^6 */
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#define MPR_CONVERSION_FACTOR (100000000)
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#elif defined(CONFIG_MPR_PRESSURE_UNIT_M)
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/* mbar to kPa conversion factor: 0.1 * 10^6 */
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#define MPR_CONVERSION_FACTOR (100000)
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#else
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#error "MPR: Unknown pressure unit."
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#endif
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/*
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* Transfer function
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*/
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#if defined(CONFIG_MPR_TRANSFER_FUNCTION_A)
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#define MPR_OUTPUT_MIN (0x19999A) /* 10% of 2^24 */
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#define MPR_OUTPUT_MAX (0xE66666) /* 90% of 2^24 */
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#elif defined(CONFIG_MPR_TRANSFER_FUNCTION_B)
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#define MPR_OUTPUT_MIN (0x66666) /* 2.5% of 2^24 */
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#define MPR_OUTPUT_MAX (0x399999) /* 22.5% of 2^24 */
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#elif defined(CONFIG_MPR_TRANSFER_FUNCTION_C)
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#define MPR_OUTPUT_MIN (0x333333) /* 20% of 2^24 */
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#define MPR_OUTPUT_MAX (0xCCCCCC) /* 80% of 2^24 */
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#else
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#error "MPR: Unknown pressure reference."
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#endif
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#define MPR_OUTPUT_RANGE (MPR_OUTPUT_MAX - MPR_OUTPUT_MIN)
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#endif /* ZEPHYR_DRIVERS_SENSOR_MPR_CONFIGURATION_H_ */

‎dts/bindings/sensor/honeywell,mpr.yaml‎

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# SPDX-License-Identifier: Apache-2.0
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description: |
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Honeywell Digital Pressure Sensor. For details see here:
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https://sensing.honeywell.com/micropressure-mpr-series
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compatible: "honeywell,mpr"
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include: i2c-device.yaml

‎tests/drivers/build_all/i2c.dtsi‎

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taper-current = <45>;
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terminate-voltage = <3000>;
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};
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test_i2c_mpr: mpr@18 {
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compatible = "honeywell,mpr";
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label = "MPR";
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reg = <0x18>;
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};

‎tests/drivers/build_all/sensors_a_h.conf‎

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CONFIG_HP206C=y
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CONFIG_HTS221=y
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CONFIG_ADXL345=y
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CONFIG_MPR=y

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