samples: sensor: update dht_polling to new API

Updates dht_polling sample to new sensor API. Depends on zephyrproject-rtos#71093 and zephyrproject-rtos#71160. Signed-off-by: Lauren Murphy <[email protected]>
laurenmurphyx64 · May 28, 2024 · 1c496f6 · 1c496f6
1 parent 147a01b
commit 1c496f6
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Showing 3 changed files with 57 additions and 17 deletions.
diff --git a/include/zephyr/drivers/sensor_data_types.h b/include/zephyr/drivers/sensor_data_types.h
@@ -110,6 +110,7 @@ struct sensor_q31_data {
 			q31_t power;           /**< Unit: watts */
 			q31_t angle;           /**< Unit: degrees */
 			q31_t electric_charge; /**< Unit: mAh */
+			q31_t humidity;        /**< Unit: RH */
 		};
 	} readings[1];
 };

diff --git a/samples/sensor/dht_polling/prj.conf b/samples/sensor/dht_polling/prj.conf
@@ -1,2 +1,3 @@
 CONFIG_STDOUT_CONSOLE=y
 CONFIG_SENSOR=y
+CONFIG_SENSOR_ASYNC_API=y
diff --git a/samples/sensor/dht_polling/src/main.c b/samples/sensor/dht_polling/src/main.c
@@ -8,17 +8,35 @@
 #include <stdlib.h>
 
 #include <zephyr/device.h>
-#include <zephyr/drivers/sensor.h>
 #include <zephyr/sys/util_macro.h>
 #include <zephyr/kernel.h>
+#include <zephyr/drivers/sensor.h>
+#include <zephyr/drivers/sensor_data_types.h>
+#include <zephyr/rtio/rtio.h>
+#include <zephyr/dsp/print_format.h>
 
 #define DHT_ALIAS(i) DT_ALIAS(_CONCAT(dht, i))
-#define DHT_DEVICE(i, _)                                                                 \
+#define DHT_DEVICE(i, _)                                                      \
 	IF_ENABLED(DT_NODE_EXISTS(DHT_ALIAS(i)), (DEVICE_DT_GET(DHT_ALIAS(i)),))
 
 /* Support up to 10 temperature/humidity sensors */
 static const struct device *const sensors[] = {LISTIFY(10, DHT_DEVICE, ())};
 
+#define DHT_IODEV(i, _)                                                      \
+	IF_ENABLED(DT_NODE_EXISTS(DHT_ALIAS(i)),                                 \
+		(SENSOR_DT_READ_IODEV(_CONCAT(dht_iodev, i), DHT_ALIAS(i),           \
+		{SENSOR_CHAN_AMBIENT_TEMP, 0},                                       \
+		{SENSOR_CHAN_HUMIDITY, 0})))
+
+LISTIFY(10, DHT_IODEV, (;));
+
+#define DHT_IODEV_REF(i, _)                                                   \
+	COND_CODE_1(DT_NODE_EXISTS(DHT_ALIAS(i)), (CONCAT(&dht_iodev, i)), (NULL))
+
+static struct rtio_iodev *dht_iodev[] = { LISTIFY(10, DHT_IODEV_REF, (,)) };
+
+RTIO_DEFINE(dht_ctx, 1, 1);
+
 int main(void)
 {
 	int rc;
@@ -32,29 +50,49 @@ int main(void)
 
 	while (1) {
 		for (size_t i = 0; i < ARRAY_SIZE(sensors); i++) {
-			struct device *dev = (struct device *)sensors[i];
+			struct device *dev = (struct device *) sensors[i];
+
+			uint8_t buf[128];
 
-			rc = sensor_sample_fetch(dev);
-			if (rc < 0) {
-				printk("%s: sensor_sample_fetch() failed: %d\n", dev->name, rc);
+			rc = sensor_read(dht_iodev[i], &dht_ctx, buf, 128);
+
+			if (rc != 0) {
+				printk("%s: sensor_read() failed: %d\n", dev->name, rc);
 				return rc;
 			}
 
-			struct sensor_value temp;
-			struct sensor_value hum;
+			const struct sensor_decoder_api *decoder;
+
+			rc = sensor_get_decoder(dev, &decoder);
 
-			rc = sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp);
-			if (rc == 0) {
-				rc = sensor_channel_get(dev, SENSOR_CHAN_HUMIDITY, &hum);
-			}
 			if (rc != 0) {
-				printf("get failed: %d\n", rc);
-				break;
+				printk("%s: sensor_get_decode() failed: %d\n", dev->name, rc);
+				return rc;
 			}
 
-			printk("%16s: temp is %d.%02d °C humidity is %d.%02d %%RH\n",
-							dev->name, temp.val1, temp.val2 / 10000,
-							hum.val1, hum.val2 / 10000);
+			uint32_t temp_fit = 0;
+			uint8_t temp_buf[64];
+
+			decoder->decode(buf,
+					(struct sensor_chan_spec) {SENSOR_CHAN_AMBIENT_TEMP, 0},
+					&temp_fit, 1, temp_buf);
+
+			struct sensor_q31_data *temp_data =
+					(struct sensor_q31_data *) temp_buf;
+
+			uint32_t hum_fit = 0;
+			uint8_t hum_buf[64];
+
+			decoder->decode(buf,
+					(struct sensor_chan_spec) {SENSOR_CHAN_HUMIDITY, 0},
+					&hum_fit, 1, hum_buf);
+
+			struct sensor_q31_data *hum_data =
+					(struct sensor_q31_data *) hum_buf;
+
+			printk("%16s: temp is %s%d.%d °C humidity is %s%d.%d RH\n", dev->name,
+				PRIq_arg(temp_data->readings[0].temperature, 2, temp_data->shift),
+				PRIq_arg(hum_data->readings[0].humidity, 2, hum_data->shift));
 		}
 		k_msleep(1000);
 	}