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drivers: sensors: ti_hdc20xx: add support for DRDY/INT pin

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Add optional support for the DRDY/INT pin. This avoids waiting a fixed
time for the temperature and humidity conversion to finish.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2021-08-08 14:00:44 +02:00 committed by Christopher Friedt
parent 28f9a7614b
commit 117090c1a2
2 changed files with 83 additions and 1 deletions
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74
drivers/sensor/ti_hdc20xx/ti_hdc20xx.c
View file

@ -5,6 +5,7 @@
*/
#include <kernel.h>
#include <drivers/gpio.h>
#include <drivers/i2c.h>
#include <drivers/sensor.h>
#include <sys/byteorder.h>
@ -16,6 +17,7 @@ LOG_MODULE_REGISTER(TI_HDC20XX, CONFIG_SENSOR_LOG_LEVEL);
/* Register addresses */
#define TI_HDC20XX_REG_TEMP 0x00
#define TI_HDC20XX_REG_HUMIDITY 0x02
#define TI_HDC20XX_REG_INT_EN 0x07
#define TI_HDC20XX_REG_CONFIG 0x0E
#define TI_HDC20XX_REG_MEAS_CFG 0x0F
#define TI_HDC20XX_REG_MANUFACTURER_ID 0xFC
@ -26,7 +28,9 @@ LOG_MODULE_REGISTER(TI_HDC20XX, CONFIG_SENSOR_LOG_LEVEL);
#define TI_HDC20XX_DEVICE_ID 0x07D0
/* Register bits */
#define TI_HDC20XX_BIT_INT_EN_DRDY_EN 0x80
#define TI_HDC20XX_BIT_CONFIG_SOFT_RES 0x80
#define TI_HDC20XX_BIT_CONFIG_DRDY_INT_EN 0x04
/* Reset time: not in the datasheet, but found by trial and error */
#define TI_HDC20XX_RESET_TIME K_MSEC(1)
@ -41,13 +45,27 @@ LOG_MODULE_REGISTER(TI_HDC20XX, CONFIG_SENSOR_LOG_LEVEL);
struct ti_hdc20xx_config {
struct i2c_dt_spec bus;
struct gpio_dt_spec gpio_int;
};
struct ti_hdc20xx_data {
struct gpio_callback cb_int;
struct k_sem sem_int;
uint16_t t_sample;
uint16_t rh_sample;
};
static void ti_hdc20xx_int_callback(const struct device *dev,
struct gpio_callback *cb, uint32_t pins)
{
struct ti_hdc20xx_data *data = CONTAINER_OF(cb, struct ti_hdc20xx_data, cb_int);
ARG_UNUSED(pins);
k_sem_give(&data->sem_int);
}
static int ti_hdc20xx_sample_fetch(const struct device *dev,
enum sensor_channel chan)
{
@ -66,7 +84,11 @@ static int ti_hdc20xx_sample_fetch(const struct device *dev,
}
/* wait for the conversion to finish */
k_sleep(TI_HDC20XX_CONVERSION_TIME);
if (config->gpio_int.port) {
k_sem_take(&data->sem_int, K_FOREVER);
} else {
k_sleep(TI_HDC20XX_CONVERSION_TIME);
}
/* temperature and humidity registers are consecutive, read them in the same burst */
rc = i2c_burst_read_dt(&config->bus, TI_HDC20XX_REG_TEMP, (uint8_t *)buf, sizeof(buf));
@ -136,6 +158,7 @@ static int ti_hdc20xx_reset(const struct device *dev)
static int ti_hdc20xx_init(const struct device *dev)
{
const struct ti_hdc20xx_config *config = dev->config;
struct ti_hdc20xx_data *data = dev->data;
uint16_t buf[2];
int rc;
@ -167,6 +190,54 @@ static int ti_hdc20xx_init(const struct device *dev)
return rc;
}
/* Configure the interrupt GPIO if available */
if (config->gpio_int.port) {
if (!device_is_ready(config->gpio_int.port)) {
LOG_ERR("Cannot get pointer to gpio interrupt device");
return -ENODEV;
}
rc = gpio_pin_configure_dt(&config->gpio_int, GPIO_INPUT);
if (rc) {
LOG_ERR("Failed to configure interrupt pin");
return rc;
}
gpio_init_callback(&data->cb_int, ti_hdc20xx_int_callback,
BIT(config->gpio_int.pin));
rc = gpio_add_callback(config->gpio_int.port, &data->cb_int);
if (rc) {
LOG_ERR("Failed to set interrupt callback");
return rc;
}
rc = gpio_pin_interrupt_configure_dt(&config->gpio_int, GPIO_INT_EDGE_TO_ACTIVE);
if (rc) {
LOG_ERR("Failed to configure interrupt");
return rc;
}
/* Initialize the semaphore */
k_sem_init(&data->sem_int, 0, K_SEM_MAX_LIMIT);
/* Enable the data ready interrupt */
rc = i2c_reg_write_byte_dt(&config->bus, TI_HDC20XX_REG_INT_EN,
TI_HDC20XX_BIT_INT_EN_DRDY_EN);
if (rc) {
LOG_ERR("Failed to enable the data ready interrupt");
return rc;
}
/* Enable the interrupt pin with level sensitive active low polarity */
rc = i2c_reg_write_byte_dt(&config->bus, TI_HDC20XX_REG_CONFIG,
TI_HDC20XX_BIT_CONFIG_DRDY_INT_EN);
if (rc) {
LOG_ERR("Failed to enable the interrupt pin");
return rc;
}
}
return 0;
}
@ -175,6 +246,7 @@ static int ti_hdc20xx_init(const struct device *dev)
static struct ti_hdc20xx_data ti_hdc20xx_data_##compat##inst; \
static const struct ti_hdc20xx_config ti_hdc20xx_config_##compat##inst = { \
.bus = I2C_DT_SPEC_GET(DT_INST(inst, compat)), \
.gpio_int = GPIO_DT_SPEC_GET_OR(DT_INST(inst, compat), int_gpios, {0}), \
}; \
DEVICE_DT_DEFINE(DT_INST(inst, compat), \
ti_hdc20xx_init, \

10
dts/bindings/sensor/ti,hdc20xx.yaml
View file

@ -6,3 +6,13 @@ description: Texas Instruments HDC20XX Temperature and Humidity Sensor
compatible: "ti,hdc20xx"
include: i2c-device.yaml
properties:
int-gpios:
type: phandle-array
required: false
description: DRDY/INT pin.
The DRDY/INT pin of HDC20xx sensor is open-drain, active low. If
connected directly the MCU pin should be configured as pull-up
as pull-up, active low.