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Delsiangalak
Delsian
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galak
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drivers: sensor: STM32 die temperature driver
STM32 internal temperature sensor driver. This sensor can be used to measure the temperature of the CPU and its surroundings. Signed-off-by: Eug Krashtan <[email protected]>
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‎drivers/sensor/CMakeLists.txt‎

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@@ -74,6 +74,7 @@ add_subdirectory_ifdef(CONFIG_SI7055 si7055)
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add_subdirectory_ifdef(CONFIG_SI7060 si7060)
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add_subdirectory_ifdef(CONFIG_SM351LT sm351lt)
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add_subdirectory_ifdef(CONFIG_HAS_STMEMSC stmemsc)
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add_subdirectory_ifdef(CONFIG_STM32_TEMP stm32_temp)
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add_subdirectory_ifdef(CONFIG_STTS751 stts751)
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add_subdirectory_ifdef(CONFIG_SX9500 sx9500)
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add_subdirectory_ifdef(CONFIG_TH02 th02)

‎drivers/sensor/Kconfig‎

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@@ -186,6 +186,8 @@ source "drivers/sensor/si7060/Kconfig"
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source "drivers/sensor/sm351lt/Kconfig"
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source "drivers/sensor/stm32_temp/Kconfig"
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source "drivers/sensor/stts751/Kconfig"
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source "drivers/sensor/sx9500/Kconfig"

‎drivers/sensor/stm32_temp/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_STM32_TEMP stm32_temp.c)

‎drivers/sensor/stm32_temp/Kconfig‎

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# STM32 temperature sensor configuration options
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# Copyright (c) 2021 Eug Krashtan
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# SPDX-License-Identifier: Apache-2.0
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config STM32_TEMP
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bool "STM32 Temperature Sensor"
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depends on (ADC && SOC_FAMILY_STM32)
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help
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Enable driver for STM32 temperature sensor.

‎drivers/sensor/stm32_temp/stm32_temp.c‎

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/*
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* Copyright (c) 2021 Eug Krashtan
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <device.h>
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#include <drivers/sensor.h>
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#include <drivers/adc.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(stm32_temp, CONFIG_SENSOR_LOG_LEVEL);
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#define DT_DRV_COMPAT st_stm32_temp
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struct stm32_temp_data {
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const struct device *adc;
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uint8_t channel;
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struct adc_channel_cfg adc_cfg;
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struct adc_sequence adc_seq;
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struct k_mutex mutex;
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int16_t sample_buffer;
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int32_t mv; /* Sensor value in millivolts */
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};
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struct stm32_temp_config {
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int avgslope;
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int v25_mv;
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int tsv_mv;
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bool is_ntc;
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};
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static int stm32_temp_sample_fetch(const struct device *dev,
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enum sensor_channel chan)
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{
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const struct stm32_temp_config *cfg = dev->config;
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struct stm32_temp_data *data = dev->data;
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struct adc_sequence *sp = &data->adc_seq;
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int rc;
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if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_DIE_TEMP) {
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return -ENOTSUP;
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}
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k_mutex_lock(&data->mutex, K_FOREVER);
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rc = adc_read(data->adc, sp);
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sp->calibrate = false;
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if (rc == 0) {
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data->mv = data->sample_buffer * cfg->tsv_mv / 0x0FFF;
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}
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k_mutex_unlock(&data->mutex);
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return 0;
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}
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static int stm32_temp_channel_get(const 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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struct stm32_temp_data *data = dev->data;
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const struct stm32_temp_config *cfg = dev->config;
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float temp;
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if (chan != SENSOR_CHAN_DIE_TEMP) {
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return -ENOTSUP;
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}
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if (cfg->is_ntc) {
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temp = (float)(cfg->v25_mv - data->mv);
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} else {
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temp = (float)(data->mv - cfg->v25_mv);
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}
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temp = (temp/cfg->avgslope)*10;
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temp += 25;
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sensor_value_from_double(val, temp);
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return 0;
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}
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static const struct sensor_driver_api stm32_temp_driver_api = {
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.sample_fetch = stm32_temp_sample_fetch,
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.channel_get = stm32_temp_channel_get,
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};
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static int stm32_temp_init(const struct device *dev)
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{
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struct stm32_temp_data *data = dev->data;
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struct adc_channel_cfg *accp = &data->adc_cfg;
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struct adc_sequence *asp = &data->adc_seq;
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int rc;
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k_mutex_init(&data->mutex);
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if (!device_is_ready(data->adc)) {
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LOG_ERR("Device %s is not ready", data->adc->name);
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return -ENODEV;
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}
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*accp = (struct adc_channel_cfg){
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.gain = ADC_GAIN_1,
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.reference = ADC_REF_INTERNAL,
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.acquisition_time = ADC_ACQ_TIME_MAX,
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.channel_id = data->channel,
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.differential = 0
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};
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rc = adc_channel_setup(data->adc, accp);
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LOG_DBG("Setup AIN%u got %d", data->channel, rc);
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*asp = (struct adc_sequence){
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.channels = BIT(data->channel),
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.buffer = &data->sample_buffer,
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.buffer_size = sizeof(data->sample_buffer),
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.resolution = 12,
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.calibrate = true,
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};
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return 0;
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}
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#define STM32_TEMP_INST(idx) \
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static struct stm32_temp_data inst_##idx##_data = { \
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.adc = DEVICE_DT_GET(DT_IO_CHANNELS_CTLR( \
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DT_INST(idx, st_stm32_temp))), \
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.channel = DT_IO_CHANNELS_INPUT( \
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DT_INST(idx, st_stm32_temp)) \
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}; \
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static const struct stm32_temp_config inst_##idx##_config = { \
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.avgslope = DT_INST_PROP(idx, avgslope), \
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.v25_mv = DT_INST_PROP(idx, v25), \
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.tsv_mv = DT_INST_PROP(idx, ts_voltage_mv), \
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.is_ntc = DT_INST_PROP(idx, ntc) \
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}; \
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DEVICE_DT_INST_DEFINE(idx, \
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stm32_temp_init, \
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NULL, \
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&inst_##idx##_data, \
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&inst_##idx##_config, \
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POST_KERNEL, \
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CONFIG_SENSOR_INIT_PRIORITY, \
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&stm32_temp_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(STM32_TEMP_INST)

‎dts/bindings/sensor/st,stm32-temp.yaml‎

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# Copyright (c) 2021, Eug Krashtan
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# SPDX-License-Identifier: Apache-2.0
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description: STM32 family TEMP node
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compatible: "st,stm32-temp"
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include: base.yaml
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properties:
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label:
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required: true
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io-channels:
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required: true
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description: ADC channel for temperature sensor
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ts-voltage-mv:
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type: int
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default: 3300
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description: Temperature sensor voltage in millivolts
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avgslope:
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type: int
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default: 25
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description: >
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Average slope of T-V chart (in mV/C x10) according to
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datasheet "Electrical characteristics/Operating conditions"
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STM32F1 Table 5.3.19 (min 4 mV/C, max 4.6, default 4.3)
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STM32F4 Table 6.3.21 default 2.5
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v25:
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type: int
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default: 760
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description: >
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Voltage of temperature sensor at 25C in mV according to
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datasheet "Electrical characteristics/Operating conditions"
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STM32F1 Table 5.3.19 (min 1340, max 1520, default 1430)
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STM32F4 Table 6.3.21 default 760
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ntc:
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type: boolean
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description: >
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Negative Temperature Coefficient. True if STM32F1

‎tests/drivers/build_all/sensors_i_z.conf‎

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CONFIG_SI7055=y
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CONFIG_SI7060=y
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CONFIG_SM351LT=y
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CONFIG_STM32_TEMP=y
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CONFIG_SX9500=y
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CONFIG_TACH_NPCX=y
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CONFIG_TEMP_NRF5=y

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