Adapted OpenMote-CC2538 sensor drivers to Contiki sensor API.

examples/openmote-cc2538/openmote-demo.c

@@ -83,31 +83,29 @@ static struct broadcast_conn bc;
 PROCESS_THREAD(openmote_demo_process, ev, data)
 {
   static struct etimer et;
-  static unsigned int raw, counter;
+  static int16_t counter;
-  static uint8_t adxl346_present, max44009_present, sht21_present;
+  static uint16_t adxl346_present, sht21_present, max44009_present;
-  static float light, temperature, humidity;
+  static uint16_t accel, light, temperature, humidity;
 
   PROCESS_EXITHANDLER(broadcast_close(&bc))
 
   PROCESS_BEGIN();
 
-  adxl346_init();
+  /* Initialize and activate the ADXL346 sensor */
-  adxl346_present = adxl346_is_present();
+  adxl346_present = SENSORS_ACTIVATE(adxl346);
-  if(!adxl346_present) {
+  if(adxl346_present == ADXL346_ERROR) {
     printf("ADXL346 sensor is NOT present!\n");
     leds_on(LEDS_YELLOW);
   }
 
-  max44009_init();
+  max44009_present = SENSORS_ACTIVATE(max44009);
-  max44009_present = max44009_is_present();
+  if(max44009_present == MAX44009_ERROR) {
-  if(!max44009_present) {
     printf("MAX44009 sensor is NOT present!\n");
     leds_on(LEDS_ORANGE);
   }
 
-  sht21_init();
+  sht21_present = SENSORS_ACTIVATE(sht21);
-  sht21_present = sht21_is_present();
+  if(sht21_present == SHT21_ERROR) {
-  if(!sht21_present) {
     printf("SHT21 sensor is NOT present!\n");
     leds_on(LEDS_RED);
   }
@@ -123,33 +121,30 @@ PROCESS_THREAD(openmote_demo_process, ev, data)
     PROCESS_YIELD();
 
     if(ev == PROCESS_EVENT_TIMER) {
-      if(adxl346_present) {
+      if(adxl346_present != ADXL346_ERROR) {
         leds_on(LEDS_YELLOW);
-        raw = adxl346_read_x();
+        accel = adxl346.value(ADXL346_READ_X);
-        printf("X Acceleration: %u\n", raw);
+        printf("X Acceleration: %u\n", accel);
-        raw = adxl346_read_y();
+        accel = adxl346.value(ADXL346_READ_Y);
-        printf("Y Acceleration: %u\n", raw);
+        printf("Y Acceleration: %u\n", accel);
-        raw = adxl346_read_z();
+        accel = adxl346.value(ADXL346_READ_Z);
-        printf("Z Acceleration: %u\n", raw);
+        printf("Z Acceleration: %u\n", accel);
         leds_off(LEDS_YELLOW);
       }
 
-      if(max44009_present) {
+      if(max44009_present != MAX44009_ERROR) {
         leds_on(LEDS_ORANGE);
-        raw = max44009_read_light();
+        light = max44009.value(MAX44009_READ_LIGHT);
-        light = max44009_convert_light(raw);
+        printf("Light: %u.%ulux\n", light / 100, light % 100);
-        printf("Light: %u.%ulux\n", (unsigned int)light, (unsigned int)(light * 100) % 100);
         leds_off(LEDS_ORANGE);
       }
 
-      if(sht21_present) {
+      if(sht21_present != SHT21_ERROR) {
         leds_on(LEDS_RED);
-        raw = sht21_read_temperature();
+        temperature = sht21.value(SHT21_READ_TEMP);
-        temperature = sht21_convert_temperature(raw);
+        printf("Temperature: %u.%uC\n", temperature / 100, temperature % 100);
-        printf("Temperature: %u.%uC\n", (unsigned int)temperature, (unsigned int)(temperature * 100) % 100);
+        humidity = sht21.value(SHT21_READ_RHUM);
-        raw = sht21_read_humidity();
+        printf("Rel. humidity: %u.%u%%\n", humidity / 100, humidity % 100);
-        humidity = sht21_convert_humidity(raw);
-        printf("Rel. humidity: %u.%u%%\n", (unsigned int)humidity, (unsigned int)(humidity * 100) % 100);
         leds_off(LEDS_RED);
       }
 

platform/openmote-cc2538/dev/adxl346.c

@@ -43,6 +43,14 @@
 /*---------------------------------------------------------------------------*/
 #include "dev/i2c.h"
 #include "dev/adxl346.h"
+#include "lib/sensors.h"
+/*---------------------------------------------------------------------------*/
+#define DEBUG 0
+#if DEBUG
+#define PRINTF(...) printf(__VA_ARGS__)
+#else
+#define PRINTF(...)
+#endif
 /*---------------------------------------------------------------------------*/
 /**
  * \name ADXL346 address and device identifier
@@ -147,7 +155,9 @@
 #define ADXL346_DATA_FORMAT_RANGE_PM_16g    (3)
 /** @} */
 /*---------------------------------------------------------------------------*/
-void
+static uint8_t enabled;
+/*---------------------------------------------------------------------------*/
+static void
 adxl346_init(void)
 {
   uint8_t config[2];
@@ -167,12 +177,7 @@ adxl346_init(void)
   i2c_burst_send(ADXL346_ADDRESS, config, sizeof(config));
 }
 /*---------------------------------------------------------------------------*/
-void
+static uint8_t
-adxl346_reset(void)
-{
-}
-/*---------------------------------------------------------------------------*/
-uint8_t
 adxl346_is_present(void)
 {
   uint8_t is_present;
@@ -183,47 +188,15 @@ adxl346_is_present(void)
   return is_present == ADXL346_DEVID_VALUE;
 }
 /*---------------------------------------------------------------------------*/
-uint16_t
+static uint16_t
-adxl346_read_x(void)
+adxl346_read_accel(uint8_t addr1, uint8_t addr2)
-{
-  uint8_t acceleration[2];
-  uint16_t x;
-
-  i2c_single_send(ADXL346_ADDRESS, ADXL346_DATAX0_ADDR);
-  i2c_single_receive(ADXL346_ADDRESS, &acceleration[0]);
-  i2c_single_send(ADXL346_ADDRESS, ADXL346_DATAX1_ADDR);
-  i2c_single_receive(ADXL346_ADDRESS, &acceleration[1]);
-
-  x = (acceleration[0] << 8) | acceleration[1];
-
-  return x;
-}
-/*---------------------------------------------------------------------------*/
-uint16_t
-adxl346_read_y(void)
-{
-  uint8_t acceleration[2];
-  uint16_t y;
-
-  i2c_single_send(ADXL346_ADDRESS, ADXL346_DATAY0_ADDR);
-  i2c_single_receive(ADXL346_ADDRESS, &acceleration[0]);
-  i2c_single_send(ADXL346_ADDRESS, ADXL346_DATAY1_ADDR);
-  i2c_single_receive(ADXL346_ADDRESS, &acceleration[1]);
-
-  y = (acceleration[0] << 8) | acceleration[1];
-
-  return y;
-}
-/*---------------------------------------------------------------------------*/
-uint16_t
-adxl346_read_z(void)
 {
   uint8_t acceleration[2];
   uint16_t z;
 
-  i2c_single_send(ADXL346_ADDRESS, ADXL346_DATAZ0_ADDR);
+  i2c_single_send(ADXL346_ADDRESS, addr1);
   i2c_single_receive(ADXL346_ADDRESS, &acceleration[0]);
-  i2c_single_send(ADXL346_ADDRESS, ADXL346_DATAZ1_ADDR);
+  i2c_single_send(ADXL346_ADDRESS, addr2);
   i2c_single_receive(ADXL346_ADDRESS, &acceleration[1]);
 
   z = (acceleration[0] << 8) | acceleration[1];
@@ -231,4 +204,56 @@ adxl346_read_z(void)
   return z;
 }
 /*---------------------------------------------------------------------------*/
+static int
+status(int type)
+{
+  switch(type) {
+  case SENSORS_ACTIVE:
+  case SENSORS_READY:
+    return enabled;
+  }
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static int
+value(int type)
+{
+  if(!enabled) {
+    PRINTF("ADXL346: sensor not started\n");
+    return ADXL346_ERROR;
+  }
+
+  if(type == ADXL346_READ_X) {
+    return adxl346_read_accel(ADXL346_DATAX0_ADDR, ADXL346_DATAX1_ADDR);
+  } else if(type == ADXL346_READ_Y) {
+    return adxl346_read_accel(ADXL346_DATAY0_ADDR, ADXL346_DATAY1_ADDR);
+  } else if(type == ADXL346_READ_Z) {
+    return adxl346_read_accel(ADXL346_DATAZ0_ADDR, ADXL346_DATAZ1_ADDR);
+  } else {
+    PRINTF("ADXL346: invalid value requested\n");
+    return ADXL346_ERROR;
+  }
+
+  return ADXL346_ERROR;
+}
+/*---------------------------------------------------------------------------*/
+static int
+configure(int type, int value)
+{
+  if(type == ADXL346_ACTIVATE) {
+    if(!adxl346_is_present()) {
+      PRINTF("ADXL346: is not present\n");
+      return ADXL346_ERROR;
+    } else {
+      adxl346_init();
+      enabled = 1;
+      return ADXL346_SUCCESS;
+    }
+  }
+
+  return ADXL346_ERROR;
+}
+/*---------------------------------------------------------------------------*/
+SENSORS_SENSOR(adxl346, ADXL346_SENSOR, value, configure, status);
+/*---------------------------------------------------------------------------*/
 /** @} */

platform/openmote-cc2538/dev/adxl346.h

@@ -47,35 +47,17 @@
 #ifndef ADXL346_H_
 #define ADXL346_H_
 /*---------------------------------------------------------------------------*/
-/**
+#define ADXL346_ERROR             (-1)
- * \brief Initialize the ADXL346 sensor
+#define ADXL346_SUCCESS           (0)
- */
+#define ADXL346_ACTIVATE          (SENSORS_ACTIVE)
-void adxl346_init(void);
+#define ADXL346_READ_X            (2)
+#define ADXL346_READ_Y            (3)
+#define ADXL346_READ_Z            (4)
+#define ADXL346_NONE              (5)
 /*---------------------------------------------------------------------------*/
-/**
+#define ADXL346_SENSOR "ADXL346 Sensor"
- * \brief Reset the ADXL346 sensor
- */
-void adxl346_reset(void);
 /*---------------------------------------------------------------------------*/
-/**
+extern const struct sensors_sensor adxl346;
- * \brief Check if the ADXL346 sensor is present
- */
-uint8_t adxl346_is_present(void);
-/*---------------------------------------------------------------------------*/
-/**
- * \brief Read the x-axis from the ADXL346 sensor
- */
-uint16_t adxl346_read_x(void);
-/*---------------------------------------------------------------------------*/
-/**
- * \brief Read the y-axis from the ADXL346 sensor
- */
-uint16_t adxl346_read_y(void);
-/*---------------------------------------------------------------------------*/
-/**
- * \brief Read the z-axis from the ADXL346 sensor
- */
-uint16_t adxl346_read_z(void);
 /*---------------------------------------------------------------------------*/
 #endif /* ADXL346_H_ */
 /*---------------------------------------------------------------------------*/

platform/openmote-cc2538/dev/max44009.c

@@ -43,6 +43,14 @@
 /*---------------------------------------------------------------------------*/
 #include "dev/i2c.h"
 #include "dev/max44009.h"
+#include "lib/sensors.h"
+/*---------------------------------------------------------------------------*/
+#define DEBUG 1
+#if DEBUG
+#define PRINTF(...) printf(__VA_ARGS__)
+#else
+#define PRINTF(...)
+#endif
 /*---------------------------------------------------------------------------*/
 /**
  * \name MAX44009 address and device identifier
@@ -94,9 +102,17 @@
                                              MAX44009_CONFIG_AUTO | \
                                              MAX44009_CONFIG_CDR_NORMAL | \
                                              MAX44009_CONFIG_INTEGRATION_100ms)
+
+#define MAX44009_USER_CONFIGURATION         (MAX44009_CONFIG_DEFAULT | \
+                                             MAX44009_CONFIG_AUTO | \
+                                             MAX44009_CONFIG_CDR_NORMAL | \
+                                             MAX44009_CONFIG_INTEGRATION_800ms)
+
 /** @} */
 /*---------------------------------------------------------------------------*/
-void
+static uint8_t enabled;
+/*---------------------------------------------------------------------------*/
+static void
 max44009_init(void)
 {
   uint8_t max44009_address[5] = { MAX44009_INT_ENABLE_ADDR, MAX44009_CONFIG_ADDR, \
@@ -106,8 +122,8 @@ max44009_init(void)
   uint8_t max44009_data[2];
   uint8_t i;
 
-  max44009_value[0] = (MAX44009_INT_STATUS_ON);
+  max44009_value[0] = (MAX44009_INT_STATUS_OFF);
-  max44009_value[1] = (MAX44009_DEFAULT_CONFIGURATION);
+  max44009_value[1] = (MAX44009_USER_CONFIGURATION);
   max44009_value[2] = (0xFF);
   max44009_value[3] = (0x00);
   max44009_value[4] = (0xFF);
@@ -119,7 +135,7 @@ max44009_init(void)
   }
 }
 /*---------------------------------------------------------------------------*/
-void
+static void
 max44009_reset(void)
 {
   uint8_t max44009_address[5] = { MAX44009_INT_ENABLE_ADDR, MAX44009_CONFIG_ADDR, \
@@ -136,7 +152,7 @@ max44009_reset(void)
   }
 }
 /*---------------------------------------------------------------------------*/
-uint8_t
+static uint8_t
 max44009_is_present(void)
 {
   uint8_t status;
@@ -151,12 +167,12 @@ max44009_is_present(void)
   return is_present != MAX44009_NOT_FOUND;
 }
 /*---------------------------------------------------------------------------*/
-uint16_t
+static uint16_t
 max44009_read_light(void)
 {
   uint8_t exponent, mantissa;
   uint8_t max44009_data[2];
-  uint16_t result;
+  uint32_t result;
 
   i2c_single_send(MAX44009_ADDRESS, MAX44009_LUX_HIGH_ADDR);
   i2c_single_receive(MAX44009_ADDRESS, &max44009_data[0]);
@@ -171,20 +187,77 @@ max44009_read_light(void)
   return result;
 }
 /*---------------------------------------------------------------------------*/
-float
+static uint16_t
 max44009_convert_light(uint16_t lux)
 {
   uint8_t exponent, mantissa;
-  float result = 0.045;
+  uint32_t result;
 
   exponent = (lux >> 8) & 0xFF;
   exponent = (exponent == 0x0F ? exponent & 0x0E : exponent);
-
   mantissa = (lux >> 0) & 0xFF;
 
-  result *= 2 ^ exponent * mantissa;
+  result = 45 * (2 ^ exponent * mantissa) / 10;
 
-  return result;
+  return (uint16_t)result;
 }
 /*---------------------------------------------------------------------------*/
+static int
+status(int type)
+{
+  switch(type) {
+  case SENSORS_ACTIVE:
+  case SENSORS_READY:
+    return enabled;
+  }
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static int
+value(int type)
+{
+  uint16_t value;
+
+  if(!enabled) {
+    PRINTF("MAX44009: sensor not started\n");
+    return MAX44009_ERROR;
+  }
+
+  if(type == MAX44009_READ_RAW_LIGHT) {
+    return max44009_read_light();
+  } else if(type == MAX44009_READ_LIGHT) {
+    value = max44009_read_light();
+    return max44009_convert_light(value);
+  } else {
+    PRINTF("MAX44009: invalid value requested\n");
+    return MAX44009_ERROR;
+  }
+}
+/*---------------------------------------------------------------------------*/
+static int
+configure(int type, int value)
+{
+  if(type == MAX44009_ACTIVATE) {
+    if(!max44009_is_present()) {
+      return MAX44009_ERROR;
+    } else {
+      max44009_init();
+      enabled = 1;
+      return MAX44009_SUCCESS;
+    }
+  }
+
+  if((type == MAX44009_RESET) && enabled) {
+    max44009_reset();
+    return MAX44009_SUCCESS;
+  } else {
+    PRINTF("MAX44009: is not enabled\n");
+    return MAX44009_ERROR;
+  }
+
+  return MAX44009_ERROR;
+}
+/*---------------------------------------------------------------------------*/
+SENSORS_SENSOR(max44009, MAX44009_SENSOR, value, configure, status);
+/*---------------------------------------------------------------------------*/
 /** @} */

platform/openmote-cc2538/dev/max44009.h

@@ -47,30 +47,17 @@
 #ifndef MAX44009_H_
 #define MAX44009_H_
 /*---------------------------------------------------------------------------*/
-/**
+#define MAX44009_ERROR            (-1)
- * \brief Initialize the MAX44009 sensor
+#define MAX44009_SUCCESS          (0)
- */
+#define MAX44009_ACTIVATE         (SENSORS_ACTIVE)
-void max44009_init(void);
+#define MAX44009_READ_RAW_LIGHT   (2)
+#define MAX44009_READ_LIGHT       (3)
+#define MAX44009_RESET            (4)
+#define MAX44009_NONE             (5)
 /*---------------------------------------------------------------------------*/
-/**
+#define MAX44009_SENSOR "MAX44009 Sensor"
- * \brief Reset the MAX44009 sensor
- */
-void max44009_reset(void);
 /*---------------------------------------------------------------------------*/
-/**
+extern const struct sensors_sensor max44009;
- * \brief Check if the MAX44009 sensor is present
- */
-uint8_t max44009_is_present(void);
-/*---------------------------------------------------------------------------*/
-/**
- * \brief Read the light from the MAX44009 sensor
- */
-uint16_t max44009_read_light(void);
-/*---------------------------------------------------------------------------*/
-/**
- * \brief Convert the light from the MAX44009 sensor
- */
-float max44009_convert_light(uint16_t light);
 /*---------------------------------------------------------------------------*/
 #endif /* MAX44009_H_ */
 /*---------------------------------------------------------------------------*/

platform/openmote-cc2538/dev/sht21.c

@@ -41,8 +41,16 @@
  * Pere Tuset <peretuset@openmote.com>
  */
 /*---------------------------------------------------------------------------*/
-#include "i2c.h"
+#include "dev/i2c.h"
-#include "sht21.h"
+#include "dev/sht21.h"
+#include "lib/sensors.h"
+/*---------------------------------------------------------------------------*/
+#define DEBUG 0
+#if DEBUG
+#define PRINTF(...) printf(__VA_ARGS__)
+#else
+#define PRINTF(...)
+#endif
 /*---------------------------------------------------------------------------*/
 /**
  * \name SHT21 address
@@ -87,13 +95,15 @@
                                          SHT21_BATTERY_ABOVE_2V25 | \
                                          SHT21_OTP_RELOAD_DISABLE)
 
-#define SHT21_USER_CONFIG               (SHT21_RESOLUTION_8b_12b | \
+#define SHT21_USER_CONFIG               (SHT21_RESOLUTION_12b_14b | \
                                          SHT21_ONCHIP_HEATER_DISABLE | \
                                          SHT21_BATTERY_ABOVE_2V25 | \
                                          SHT21_OTP_RELOAD_DISABLE)
 /** @} */
 /*---------------------------------------------------------------------------*/
-void
+static uint8_t enabled;
+/*---------------------------------------------------------------------------*/
+static void
 sht21_init(void)
 {
   uint8_t config[2];
@@ -116,14 +126,14 @@ sht21_init(void)
   i2c_burst_send(SHT21_ADDRESS, config, sizeof(config));
 }
 /*---------------------------------------------------------------------------*/
-void
+static void
 sht21_reset(void)
 {
   /* Send a soft-reset command according to the datasheet (pag. 9, fig. 17) */
   i2c_single_send(SHT21_ADDRESS, SHT21_RESET_CMD);
 }
 /*---------------------------------------------------------------------------*/
-uint8_t
+static uint8_t
 sht21_is_present(void)
 {
   uint8_t status;
@@ -142,7 +152,7 @@ sht21_is_present(void)
   return (is_present == SHT21_USER_CONFIG) || (is_present == SHT21_DEFAULT_CONFIG);
 }
 /*---------------------------------------------------------------------------*/
-uint16_t
+static uint32_t
 sht21_read_temperature(void)
 {
   uint8_t sht21_temperature[2];
@@ -152,23 +162,24 @@ sht21_read_temperature(void)
   i2c_single_send(SHT21_ADDRESS, SHT21_TEMPERATURE_HM_CMD);
   i2c_burst_receive(SHT21_ADDRESS, sht21_temperature, sizeof(sht21_temperature));
 
-  temperature = (sht21_temperature[0] << 8) | (sht21_temperature[1] & SHT21_STATUS_MASK);
+  temperature = (sht21_temperature[0] << 8) | ((sht21_temperature[1] & SHT21_STATUS_MASK));
 
   return temperature;
 }
 /*---------------------------------------------------------------------------*/
-float
+static int16_t
-sht21_convert_temperature(uint16_t temperature)
+sht21_convert_temperature(uint32_t temperature)
 {
-  float result;
+  int16_t result;
 
-  result = -46.85;
+  temperature *= 17572;
-  result += 175.72 * (float)temperature / 65536.0;
+  temperature = temperature >> 16;
+  result = (int16_t)temperature - 4685;
 
   return result;
 }
 /*---------------------------------------------------------------------------*/
-uint16_t
+static uint32_t
 sht21_read_humidity(void)
 {
   uint8_t sht21_humidity[2];
@@ -178,20 +189,86 @@ sht21_read_humidity(void)
   i2c_single_send(SHT21_ADDRESS, SHT21_HUMIDITY_HM_CMD);
   i2c_burst_receive(SHT21_ADDRESS, sht21_humidity, sizeof(sht21_humidity));
 
-  humidity = (sht21_humidity[0] << 8) | (sht21_humidity[1] & SHT21_STATUS_MASK);
+  humidity = (sht21_humidity[0] << 8) | ((sht21_humidity[1] & SHT21_STATUS_MASK));
 
   return humidity;
 }
 /*---------------------------------------------------------------------------*/
-float
+static int16_t
-sht21_convert_humidity(uint16_t humidity)
+sht21_convert_humidity(uint32_t humidity)
 {
-  float result;
+  int16_t result;
 
-  result = -6.0;
+  humidity *= 12500;
-  result += 125.0 * (float)humidity / 65536.0;
+  humidity = humidity >> 16;
+  result = (int16_t)humidity - 600;
+  result = (result > 10000) ? 10000 : result;
 
   return result;
 }
 /*---------------------------------------------------------------------------*/
+static int
+status(int type)
+{
+  switch(type) {
+  case SENSORS_ACTIVE:
+  case SENSORS_READY:
+    return enabled;
+  }
+  return 0;
+}
+/*---------------------------------------------------------------------------*/
+static int
+value(int type)
+{
+  uint32_t value;
+
+  if(!enabled) {
+    PRINTF("SHT21: sensor not started\n");
+    return SHT21_ERROR;
+  }
+
+  if(type == SHT21_READ_RAW_TEMP) {
+    return sht21_read_temperature();
+  } else if(type == SHT21_READ_RAW_RHUM) {
+    return sht21_read_humidity();
+  } else if(type == SHT21_READ_TEMP) {
+    value = sht21_read_temperature();
+    return sht21_convert_temperature(value);
+  } else if(type == SHT21_READ_RHUM) {
+    value = sht21_read_humidity();
+    return sht21_convert_humidity(value);
+  } else {
+    PRINTF("SHT21: invalid value requested\n");
+    return SHT21_ERROR;
+  }
+}
+/*---------------------------------------------------------------------------*/
+static int
+configure(int type, int value)
+{
+  if(type == SHT21_ACTIVATE) {
+    if(!sht21_is_present()) {
+      PRINTF("SHT21: is not present\n");
+      return SHT21_ERROR;
+    } else {
+      sht21_init();
+      enabled = 1;
+      return SHT21_SUCCESS;
+    }
+  }
+
+  if(type == SHT21_RESET && enabled) {
+    sht21_reset();
+    return SHT21_SUCCESS;
+  } else {
+    PRINTF("SHT21: is not enabled\n");
+    return SHT21_ERROR;
+  }
+
+  return SHT21_ERROR;
+}
+/*---------------------------------------------------------------------------*/
+SENSORS_SENSOR(sht21, SHT21_SENSOR, value, configure, status);
+/*---------------------------------------------------------------------------*/
 /** @} */

platform/openmote-cc2538/dev/sht21.h

@@ -47,40 +47,19 @@
 #ifndef SHT21_H_
 #define SHT21_H_
 /*---------------------------------------------------------------------------*/
-/**
+#define SHT21_ERROR             (-1)
- * \brief Initialize the SHT21 sensor
+#define SHT21_SUCCESS           (0)
- */
+#define SHT21_ACTIVATE          (SENSORS_ACTIVE)
-void sht21_init(void);
+#define SHT21_READ_RAW_TEMP     (2)
+#define SHT21_READ_RAW_RHUM     (3)
+#define SHT21_READ_TEMP         (4)
+#define SHT21_READ_RHUM         (5)
+#define SHT21_RESET             (6)
+#define SHT21_NONE              (7)
 /*---------------------------------------------------------------------------*/
-/**
+#define SHT21_SENSOR "SHT21 Sensor"
- * \brief Reset the SHT21 sensor
- */
-void sht21_reset(void);
 /*---------------------------------------------------------------------------*/
-/**
+extern const struct sensors_sensor sht21;
- * \brief Check if the SHT21 sensor is present
- */
-uint8_t sht21_is_present(void);
-/*---------------------------------------------------------------------------*/
-/**
- * \brief Read the temperature from the SHT21 sensor
- */
-uint16_t sht21_read_temperature(void);
-/*---------------------------------------------------------------------------*/
-/**
- * \brief Convert the temperature from the SHT21 sensor
- */
-float sht21_convert_temperature(uint16_t temperature);
-/*---------------------------------------------------------------------------*/
-/**
- * \brief Read the relative humidity from the SHT21 sensor
- */
-uint16_t sht21_read_humidity(void);
-/*---------------------------------------------------------------------------*/
-/**
- * \brief Convert the relative humidity from the SHT21 sensor
- */
-float sht21_convert_humidity(uint16_t humidity);
 /*---------------------------------------------------------------------------*/
 #endif /* SHT21_H_ */
 /*---------------------------------------------------------------------------*/