diff --git a/examples/ccs811/README.md b/examples/ccs811/README.md
index 1cb7e12..5ff5b5d 100644
--- a/examples/ccs811/README.md
+++ b/examples/ccs811/README.md
@@ -9,8 +9,8 @@ Most examples use only one CCS811 sensor. Following figure shows the hardware co
```
+------------------------+ +--------+
| ESP8266 Bus 0 | | CCS811 |
- | GPIO 5 (SCL) >----> SCL |
- | GPIO 4 (SDA) ------ SDA |
+ | GPIO 5 (SCL) -----> SCL |
+ | GPIO 4 (SDA) <----> SDA |
| GND -----> /WAKE |
+------------------------+ +--------+
```
@@ -20,8 +20,8 @@ If *nINT* interrupt is used to fetch new data, additionally the interrupt pin ha
```
+------------------------+ +--------+
| ESP8266 Bus 0 | | CCS811 |
- | GPIO 5 (SCL) >----> SCL |
- | GPIO 4 (SDA) ------ SDA |
+ | GPIO 5 (SCL) -----> SCL |
+ | GPIO 4 (SDA) <----> SDA |
| GPIO 2 <----- /nINT |
| GND -----> /WAKE |
+------------------------+ +--------+
@@ -32,13 +32,13 @@ In examples where CCS811 sensor is used in conjunction with a SHT3x sensor, the
```
+------------------------+ +--------+
| ESP8266 Bus 0 | | CCS811 |
- | GPIO 5 (SCL) >--+----> SCL |
- | GPIO 4 (SDA) ---|-+--- SDA |
+ | GPIO 5 (SCL) ---+----> SCL |
+ | GPIO 4 (SDA) <--|-+--> SDA |
| GND ---|-|--> /WAKE |
| | | | +--------+
| | | | | SHT3x |
| | +----> SCL |
- | | +--- SDA |
+ | | +--> SDA |
+------------------------+ +--------+
```
diff --git a/examples/ccs811/ccs811_one_sensor/ccs811_one_sensor.c b/examples/ccs811/ccs811_one_sensor/ccs811_one_sensor.c
index 0123dde..a53b8a6 100644
--- a/examples/ccs811/ccs811_one_sensor/ccs811_one_sensor.c
+++ b/examples/ccs811/ccs811_one_sensor/ccs811_one_sensor.c
@@ -6,40 +6,57 @@
*
* Harware configuration:
*
- * +------------------------+ +--------+
- * | ESP8266 Bus 0 | | CCS811 |
- * | GPIO 5 (SCL) >----> SCL |
- * | GPIO 4 (SDA) ------ SDA |
- * | GPIO 2 <----- /nINT |
- * | GND -----> /WAKE |
- * +------------------------+ +--------+
+ * +-----------------+ +----------+
+ * | ESP8266 / ESP32 | | CCS811 |
+ * | | | |
+ * | GPIO 14 (SCL) ----> SCL |
+ * | GPIO 13 (SDA) <---> SDA |
+ * | GPIO 5 <---- INT1 |
+ * | GND ----> /WAKE |
+ * +-----------------+ +----------+
*/
-// use following constants to define the demo mode
+/* -- use following constants to define the example mode ----------- */
+
// #define INT_DATA_RDY_USED
// #define INT_THRESHOLD_USED
-#include "espressif/esp_common.h"
-#include "esp/uart.h"
-#include "i2c/i2c.h"
+#if defined(INT_DATA_RDY_USED) || defined(INT_THRESHOLD_USED)
+#define INT_USED
+#endif
-#include "FreeRTOS.h"
-#include <task.h>
+/* -- includes ----------------------------------------------------- */
-// include CCS811 driver
-#include "ccs811/ccs811.h"
+#include "ccs811.h"
-// define I2C interfaces at which CCS811 sensors can be connected
+/* -- platform dependent definitions ------------------------------- */
+
+#ifdef ESP_PLATFORM // ESP32 (ESP-IDF)
+
+// user task stack depth for ESP32
+#define TASK_STACK_DEPTH 2048
+
+#else // ESP8266 (esp-open-rtos)
+
+// user task stack depth for ESP8266
+#define TASK_STACK_DEPTH 256
+
+#endif // ESP_PLATFORM
+
+// I2C interface defintions for ESP32 and ESP8266
#define I2C_BUS 0
-#define I2C_SCL_PIN 5
-#define I2C_SDA_PIN 4
+#define I2C_SCL_PIN 14
+#define I2C_SDA_PIN 13
+#define I2C_FREQ I2C_FREQ_100K
-// define GPIO for interrupt
-#define INT_GPIO 2
+// interrupt GPIOs defintions for ESP8266 and ESP32
+#define nINT_PIN 13
+
+/* -- user tasks --------------------------------------------------- */
static ccs811_sensor_t* sensor;
-#if defined(INT_DATA_RDY_USED) || defined(INT_THRESHOLD_USED)
+#ifdef INT_USED
/**
* In this example, the interrupt *nINT* is used. It is triggered every time
* new data are available (INT_DATA_RDY_USED) or exceed defined thresholds
@@ -73,12 +90,12 @@ void user_task_interrupt (void *pvParameters)
// Interrupt handler which resumes user_task_interrupt on interrupt
-void nINT_handler (uint8_t gpio)
+static void IRAM nINT_handler(uint8_t gpio)
{
xTaskResumeFromISR (nINT_task);
}
-#else
+#else // !INT_USED
/*
* In this example, user task fetches the sensor values every seconds.
@@ -106,20 +123,21 @@ void user_task_periodic(void *pvParameters)
}
}
-#endif
+#endif // INT_USED
+/* -- main program ------------------------------------------------- */
void user_init(void)
{
- // set UART Parameter
+ // Set UART Parameter.
uart_set_baud(0, 115200);
- // give the UART some time to settle
- sdk_os_delay_us(500);
+ // Give the UART some time to settle
+ vTaskDelay(1);
/** -- MANDATORY PART -- */
// init all I2C bus interfaces at which CCS811 sensors are connected
- i2c_init (I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ_100K);
+ i2c_init (I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ);
// longer clock stretching is required for CCS811
i2c_set_clock_stretch (I2C_BUS, CCS811_I2C_CLOCK_STRETCH);
@@ -129,28 +147,29 @@ void user_init(void)
if (sensor)
{
- #if defined(INT_DATA_RDY_USED) || defined(INT_THRESHOLD_USED)
+ #if !defined (INT_USED)
+
+ // create a periodic task that uses the sensor
+ xTaskCreate(user_task_periodic, "user_task_periodic", TASK_STACK_DEPTH, NULL, 2, NULL);
+
+ #else // INT_USED
// create a task that is resumed by interrupt handler to use the sensor
- xTaskCreate(user_task_interrupt, "user_task_interrupt", 256, NULL, 2, &nINT_task);
+ xTaskCreate(user_task_interrupt, "user_task_interrupt", TASK_STACK_DEPTH, NULL, 2, &nINT_task);
- // activate the interrupt for INT_GPIO and set the interrupt handler
- gpio_set_interrupt(INT_GPIO, GPIO_INTTYPE_EDGE_NEG, nINT_handler);
+ // activate the interrupt for nINT_PIN and set the interrupt handler
+ gpio_enable(nINT_PIN, GPIO_INPUT);
+ gpio_set_interrupt(nINT_PIN, GPIO_INTTYPE_EDGE_NEG, nINT_handler);
#ifdef INT_DATA_RDY_USED
// enable the data ready interrupt
ccs811_enable_interrupt (sensor, true);
- #else
+ #else // INT_THRESHOLD_USED
// set threshold parameters and enable threshold interrupt mode
ccs811_set_eco2_thresholds (sensor, 600, 1100, 40);
#endif
- #else
-
- // create a periodic task that uses the sensor
- xTaskCreate(user_task_periodic, "user_task_periodic", 256, NULL, 2, NULL);
-
- #endif
+ #endif // !defined(INT_USED)
// start periodic measurement with one measurement per second
ccs811_set_mode (sensor, ccs811_mode_1s);
diff --git a/examples/ccs811/ccs811_plus_sht3x/ccs811_plus_sht3x.c b/examples/ccs811/ccs811_plus_sht3x/ccs811_plus_sht3x.c
index 90976bd..5e32f38 100644
--- a/examples/ccs811/ccs811_plus_sht3x/ccs811_plus_sht3x.c
+++ b/examples/ccs811/ccs811_plus_sht3x/ccs811_plus_sht3x.c
@@ -6,13 +6,13 @@
*
* +------------------------+ +--------+
* | ESP8266 Bus 0 | | CCS811 |
- * | GPIO 5 (SCL) >--+----> SCL |
- * | GPIO 4 (SDA) ---|-+--- SDA |
+ * | GPIO 14 (SCL) ---+----> SCL |
+ * | GPIO 13 (SDA) <--|-+--> SDA |
* | GND ---|-|--> /WAKE |
* | | | | +--------+
* | | | | | SHT3x |
* | | +----> SCL |
- * | | +--- SDA |
+ * | | +--> SDA |
* +------------------------+ +--------+
*/
@@ -31,8 +31,8 @@
// define I2C interfaces at which CCS811 and SHT3x sensors are connected
#define I2C_BUS 0
-#define I2C_SCL_PIN 5
-#define I2C_SDA_PIN 4
+#define I2C_SCL_PIN 14
+#define I2C_SDA_PIN 13
static ccs811_sensor_t* ccs811; // CCS811 device data structure
static sht3x_sensor_t* sht3x; // SHT3x device data structure
diff --git a/examples/ccs811/ccs811_temperature/ccs811_temperature.c b/examples/ccs811/ccs811_temperature/ccs811_temperature.c
index 56cfaad..6a81c7f 100644
--- a/examples/ccs811/ccs811_temperature/ccs811_temperature.c
+++ b/examples/ccs811/ccs811_temperature/ccs811_temperature.c
@@ -7,8 +7,8 @@
*
* +------------------------+ +--------+
* | ESP8266 Bus 0 | | CCS811 |
- * | GPIO 5 (SCL) >----> SCL |
- * | GPIO 4 (SDA) ------ SDA |
+ * | GPIO 14 (SCL) >----> SCL |
+ * | GPIO 13 (SDA) <----> SDA |
* | GND -----> /WAKE |
* +------------------------+ +--------+
*/
@@ -27,8 +27,8 @@
// define I2C interfaces at which CCS811 sensors can be connected
#define I2C_BUS 0
-#define I2C_SCL_PIN 5
-#define I2C_SDA_PIN 4
+#define I2C_SCL_PIN 14
+#define I2C_SDA_PIN 13
static ccs811_sensor_t* sensor;
diff --git a/extras/ccs811/README.md b/extras/ccs811/README.md
index d1795f1..fa660ae 100644
--- a/extras/ccs811/README.md
+++ b/extras/ccs811/README.md
@@ -1,6 +1,8 @@
# Driver for the ams CCS811 digital gas sensor for monitoring indoor air quality.
-This driver is written for usage with the ESP8266 and FreeRTOS using the I2C interface driver.
+The driver is for the usage with the ESP8266 and [esp-open-rtos](https://github.com/SuperHouse/esp-open-rtos).
+
+It is also working with ESP32 and [ESP-IDF](https://github.com/espressif/esp-idf.git) using a wrapper component for ESP8266 functions, see folder ```components/esp8266_wrapper```, as well as Linux based systems using a wrapper library.
## About the sensor
@@ -32,7 +34,7 @@ After power up, the sensor starts automatically in *Idle, Low Current Mode* (```
**Please note:** In *Constant Power Mode* with measurements every 250 ms (```mode_250ms```) only raw data are available. In all other measurement modes, the Indoor Air Quality (IAQ) values are available additionally. The *Constant Power Mode* with measurements every 250 ms (```mode_250ms```) is only intended for systems where an external host system wants to run an algorithm with raw data.
-Once the is initialized with function ```ccs811_init_sensor```, function ```ccs811_set_mode``` can be used to start periodic measurements with a given period.
+Once the sensor is initialized with function ```ccs811_init_sensor```, function ```ccs811_set_mode``` can be used to start periodic measurements with a given period.
```
static ccs811_sensor_t* sensor;
@@ -211,42 +213,46 @@ First, the hardware configuration has to be established.
### Hardware configurations
-Following figure shows the hardware configuration if no interrupt is used.
+Following figure shows the hardware configuration for ESP8266 and ESP32 if no interrupt is used.
```
- +------------------------+ +--------+
- | ESP8266 Bus 0 | | CCS811 |
- | GPIO 5 (SCL) >----> SCL |
- | GPIO 4 (SDA) ------ SDA |
- | GND -----> /WAKE |
- +------------------------+ +--------+
+ +------------------+ +--------+
+ | ESP8266 / ESP32 | | CCS811 |
+ | | | |
+ | GPIO 14 (SCL) >-------> SCL |
+ | GPIO 13 (SDA) <-------> SDA |
+ | GND --------> /WAKE |
+ +------------------+ +--------+
```
If interrupt signal *nINT* is used to fetch new data, additionally the interrupt pin has to be connected to a GPIO pin.
```
- +------------------------+ +--------+
- | ESP8266 Bus 0 | | CCS811 |
- | GPIO 5 (SCL) >----> SCL |
- | GPIO 4 (SDA) ------ SDA |
- | GPIO 2 <----- /nINT |
- | GND -----> /WAKE |
- +------------------------+ +--------+
+ +------------------+ +--------+
+ | ESP8266 / ESP32 | | CCS811 |
+ | | | |
+ | GPIO 14 (SCL) >-------> SCL |
+ | GPIO 13 (SDA) <-------> SDA |
+ | GPIO 5 <-------- /nINT |
+ | GND --------> /WAKE |
+ +------------------+ +--------+
```
If CCS811 sensor is used in conjunction with another sensor, e.g., a SHT3x sensor, the hardware configuration looks like following:
```
- +------------------------+ +--------+
- | ESP8266 Bus 0 | | CCS811 |
- | GPIO 5 (SCL) >--+----> SCL |
- | GPIO 4 (SDA) ---|-+--- SDA |
- | GND ---|-|--> /WAKE |
- | | | | +--------+
- | | | | | SHT3x |
- | | +----> SCL |
- | | +--- SDA |
- +------------------------+ +--------+
+ +------------------+ +--------+
+ | ESP8266 / ESP32 | | CCS811 |
+ | | | |
+ | GPIO 14 (SCL) >--+----> SCL |
+ | GPIO 13 (SDA) <--|-+--> SDA |
+ | GND ---|-|--> /WAKE |
+ | | | | +--------+
+ | | | | | SHT3x |
+ | | | | | |
+ | | +----> SCL |
+ | | +--> SDA |
+ +------------------+ +--------+
```
### Communication interface settings
@@ -256,12 +262,11 @@ Dependent on the hardware configuration, the communication interface settings ha
```
// define I2C interfaces at which CCS811 sensors can be connected
#define I2C_BUS 0
-#define I2C_SCL_PIN 5
-#define I2C_SDA_PIN 4
+#define I2C_SCL_PIN 14
+#define I2C_SDA_PIN 13
// define GPIO for interrupt
-#define INT_GPIO 2
-#include "sht3x/sht3x.h"
+#define INT_GPIO 5
```
### Main program
@@ -272,7 +277,7 @@ Before using the CCS811 driver, function ```i2c_init``` needs to be called for e
```
...
-i2c_init(I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ_100K));
+i2c_init(I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ_100K);
i2c_set_clock_stretch (I2C_BUS, CCS811_I2C_CLOCK_STRETCH);
...
```
@@ -401,31 +406,47 @@ ccs811_set_eco2_thresholds (sensor, 600, 1100, 40);
## Full Example
```
-// use following constants to define the demo mode
+/* -- use following constants to define the example mode ----------- */
+
// #define INT_DATA_RDY_USED
// #define INT_THRESHOLD_USED
-#include "espressif/esp_common.h"
-#include "esp/uart.h"
-#include "i2c/i2c.h"
+#if defined(INT_DATA_RDY_USED) || defined(INT_THRESHOLD_USED)
+#define INT_USED
+#endif
-#include "FreeRTOS.h"
-#include <task.h>
+/* -- includes ----------------------------------------------------- */
-// include CCS811 driver
-#include "ccs811/ccs811.h"
+#include "ccs811.h"
-// define I2C interfaces at which CCS811 sensors can be connected
+/* -- platform dependent definitions ------------------------------- */
+
+#ifdef ESP_PLATFORM // ESP32 (ESP-IDF)
+
+// user task stack depth for ESP32
+#define TASK_STACK_DEPTH 2048
+
+#else // ESP8266 (esp-open-rtos)
+
+// user task stack depth for ESP8266
+#define TASK_STACK_DEPTH 256
+
+#endif // ESP_PLATFORM
+
+// I2C interface defintions for ESP32 and ESP8266
#define I2C_BUS 0
-#define I2C_SCL_PIN 5
-#define I2C_SDA_PIN 4
+#define I2C_SCL_PIN 14
+#define I2C_SDA_PIN 13
+#define I2C_FREQ I2C_FREQ_100K
-// define GPIO for interrupt
-#define INT_GPIO 2
+// interrupt GPIOs defintions for ESP8266 and ESP32
+#define nINT_PIN 13
+
+/* -- user tasks --------------------------------------------------- */
static ccs811_sensor_t* sensor;
-#if defined(INT_DATA_RDY_USED) || defined(INT_THRESHOLD_USED)
+#ifdef INT_USED
/**
* In this example, the interrupt *nINT* is used. It is triggered every time
* new data are available (INT_DATA_RDY_USED) or exceed defined thresholds
@@ -459,12 +480,12 @@ void user_task_interrupt (void *pvParameters)
// Interrupt handler which resumes user_task_interrupt on interrupt
-void nINT_handler (uint8_t gpio)
+static void IRAM nINT_handler(uint8_t gpio)
{
xTaskResumeFromISR (nINT_task);
}
-#else
+#else // !INT_USED
/*
* In this example, user task fetches the sensor values every seconds.
@@ -492,21 +513,22 @@ void user_task_periodic(void *pvParameters)
}
}
-#endif
+#endif // INT_USED
+/* -- main program ------------------------------------------------- */
void user_init(void)
{
- // set UART Parameter
+ // Set UART Parameter.
uart_set_baud(0, 115200);
- // give the UART some time to settle
- sdk_os_delay_us(500);
+ // Give the UART some time to settle
+ vTaskDelay(1);
/** -- MANDATORY PART -- */
// init all I2C bus interfaces at which CCS811 sensors are connected
- i2c_init(I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ_100K);
-
+ i2c_init (I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ);
+
// longer clock stretching is required for CCS811
i2c_set_clock_stretch (I2C_BUS, CCS811_I2C_CLOCK_STRETCH);
@@ -515,33 +537,35 @@ void user_init(void)
if (sensor)
{
- #if defined(INT_DATA_RDY_USED) || defined(INT_THRESHOLD_USED)
+ #if !defined (INT_USED)
+
+ // create a periodic task that uses the sensor
+ xTaskCreate(user_task_periodic, "user_task_periodic", TASK_STACK_DEPTH, NULL, 2, NULL);
+
+ #else // INT_USED
// create a task that is resumed by interrupt handler to use the sensor
- xTaskCreate(user_task_interrupt, "user_task_interrupt", 256, NULL, 2, &nINT_task);
+ xTaskCreate(user_task_interrupt, "user_task_interrupt", TASK_STACK_DEPTH, NULL, 2, &nINT_task);
- // activate the interrupt for INT_GPIO and set the interrupt handler
- gpio_set_interrupt(INT_GPIO, GPIO_INTTYPE_EDGE_NEG, nINT_handler);
+ // activate the interrupt for nINT_PIN and set the interrupt handler
+ gpio_enable(nINT_PIN, GPIO_INPUT);
+ gpio_set_interrupt(nINT_PIN, GPIO_INTTYPE_EDGE_NEG, nINT_handler);
#ifdef INT_DATA_RDY_USED
// enable the data ready interrupt
ccs811_enable_interrupt (sensor, true);
- #else
+ #else // INT_THRESHOLD_USED
// set threshold parameters and enable threshold interrupt mode
ccs811_set_eco2_thresholds (sensor, 600, 1100, 40);
#endif
- #else
-
- // create a periodic task that uses the sensor
- xTaskCreate(user_task_periodic, "user_task_periodic", 256, NULL, 2, NULL);
-
- #endif
+ #endif // !defined(INT_USED)
// start periodic measurement with one measurement per second
ccs811_set_mode (sensor, ccs811_mode_1s);
}
}
+
```
## Further Examples
diff --git a/extras/ccs811/ccs811.c b/extras/ccs811/ccs811.c
index b1de154..2087b2a 100644
--- a/extras/ccs811/ccs811.c
+++ b/extras/ccs811/ccs811.c
@@ -1,14 +1,16 @@
/*
- * Driver for ams CCS811 digital temperature, humity, pressure and
- * gas sensor connected to I2C or SPI
+ * Driver for AMS CCS811 digital gas sensor connected to I2C.
*
- * Part of esp-open-rtos [https://github.com/SuperHouse/esp-open-rtos]
+ * This driver is for the usage with the ESP8266 and FreeRTOS (esp-open-rtos)
+ * [https://github.com/SuperHouse/esp-open-rtos]. It is also working with ESP32
+ * and ESP-IDF [https://github.com/espressif/esp-idf.git] as well as Linux
+ * based systems using a wrapper library for ESP8266 functions.
*
* ---------------------------------------------------------------------------
*
* The BSD License (3-clause license)
*
- * Copyright (c) 2017 Gunar Schorcht (https://github.com/gschorcht]
+ * Copyright (c) 2017 Gunar Schorcht (https://github.com/gschorcht)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -39,14 +41,7 @@
*/
#include <string.h>
-
-#include "espressif/esp_common.h"
-#include "espressif/sdk_private.h"
-
-#include "FreeRTOS.h"
-#include "task.h"
-
-#include "i2c/i2c.h"
+#include <stdlib.h>
#include "ccs811.h"
@@ -239,7 +234,7 @@ bool ccs811_set_mode (ccs811_sensor_t* dev, ccs811_mode_t mode)
// check whether setting measurement mode were succesfull
if (!ccs811_reg_read(dev, CCS811_REG_MEAS_MODE, (uint8_t*)®, 1) ||
- !reg.drive_mode == mode)
+ reg.drive_mode != mode)
{
error_dev ("Could not set measurement mode to %d", __FUNCTION__, dev, mode);
return ccs811_check_error_status (dev);
diff --git a/extras/ccs811/ccs811.h b/extras/ccs811/ccs811.h
index d4f08e9..d7d3aa5 100644
--- a/extras/ccs811/ccs811.h
+++ b/extras/ccs811/ccs811.h
@@ -1,13 +1,16 @@
/*
- * Driver for AMS CCS811 digital gas sensor connected to I2C
+ * Driver for AMS CCS811 digital gas sensor connected to I2C.
*
- * Part of esp-open-rtos [https://github.com/SuperHouse/esp-open-rtos]
+ * This driver is for the usage with the ESP8266 and FreeRTOS (esp-open-rtos)
+ * [https://github.com/SuperHouse/esp-open-rtos]. It is also working with ESP32
+ * and ESP-IDF [https://github.com/espressif/esp-idf.git] as well as Linux
+ * based systems using a wrapper library for ESP8266 functions.
*
* ---------------------------------------------------------------------------
*
* The BSD License (3-clause license)
*
- * Copyright (c) 2017 Gunar Schorcht (https://github.com/gschorcht]
+ * Copyright (c) 2017 Gunar Schorcht (https://github.com/gschorcht)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -40,13 +43,15 @@
#ifndef CCS811_DRV_H_
#define CCS811_DRV_H_
-#include "stdint.h"
-#include "stdbool.h"
-
// Uncomment one of the following defines to enable debug output
// #define CCS811_DEBUG_LEVEL_1 // only error messages
// #define CCS811_DEBUG_LEVEL_2 // debug and error messages
+#include "stdint.h"
+#include "stdbool.h"
+
+#include "ccs811_platform.h"
+
// CCS811 I2C addresses
#define CCS811_I2C_ADDRESS_1 0x5A // default
#define CCS811_I2C_ADDRESS_2 0x5B
diff --git a/extras/ccs811/ccs811_platform.h b/extras/ccs811/ccs811_platform.h
new file mode 100644
index 0000000..c8a23ab
--- /dev/null
+++ b/extras/ccs811/ccs811_platform.h
@@ -0,0 +1,69 @@
+/*
+ * Driver for AMS CCS811 digital gas sensor connected to I2C.
+ *
+ * This driver is for the usage with the ESP8266 and FreeRTOS (esp-open-rtos)
+ * [https://github.com/SuperHouse/esp-open-rtos]. It is also working with ESP32
+ * and ESP-IDF [https://github.com/espressif/esp-idf.git] as well as Linux
+ * based systems using a wrapper library for ESP8266 functions.
+ *
+ * ---------------------------------------------------------------------------
+ *
+ * The BSD License (3-clause license)
+ *
+ * Copyright (c) 2017 Gunar Schorcht (https://github.com/gschorcht)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * Platform file: platform specific definitions, includes and functions
+ */
+
+#ifndef __CCS811_PLATFORM_H__
+#define __CCS811_PLATFORM_H__
+
+#if !defined(ESP_OPEN_RTOS)
+#define ESP_OPEN_RTOS 1
+#endif
+
+#ifdef ESP_OPEN_RTOS // ESP8266
+
+// platform specific includes
+
+#include "FreeRTOS.h"
+#include "task.h"
+
+#include "espressif/esp_common.h"
+#include "espressif/sdk_private.h"
+
+#include "esp/uart.h"
+#include "i2c/i2c.h"
+
+#endif // ESP_OPEN_RTOS
+
+#endif // __CCS811_PLATFORM_H__
diff --git a/extras/ccs811/component.mk b/extras/ccs811/component.mk
index b69ad0b..037b122 100644
--- a/extras/ccs811/component.mk
+++ b/extras/ccs811/component.mk
@@ -2,6 +2,7 @@
# expected anyone using ccs811 driver includes it as 'ccs811/ccs811.h'
INC_DIRS += $(ccs811_ROOT)..
+INC_DIRS += $(ccs811_ROOT)
# args for passing into compile rule generation
ccs811_SRC_DIR = $(ccs811_ROOT)