631 lines
19 KiB
C
631 lines
19 KiB
C
/*
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* Driver for AMS CCS811 digital gas sensor connected to I2C.
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*
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* This driver is for the usage with the ESP8266 and FreeRTOS (esp-open-rtos)
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* [https://github.com/SuperHouse/esp-open-rtos]. It is also working with ESP32
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* and ESP-IDF [https://github.com/espressif/esp-idf.git] as well as Linux
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* based systems using a wrapper library for ESP8266 functions.
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*
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* ---------------------------------------------------------------------------
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*
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* The BSD License (3-clause license)
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*
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* Copyright (c) 2017 Gunar Schorcht (https://github.com/gschorcht)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "ccs811.h"
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#if defined(CCS811_DEBUG_LEVEL_2)
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#define debug(s, f, ...) printf("%s %s: " s "\n", "CCS811", f, ## __VA_ARGS__)
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#define debug_dev(s, f, d, ...) printf("%s %s: bus %d, addr %02x - " s "\n", "CCS811", f, d->bus, d->addr, ## __VA_ARGS__)
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#else
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#define debug(s, f, ...)
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#define debug_dev(s, f, d, ...)
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#endif
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#if defined(CCS811_DEBUG_LEVEL_1) || defined(CCS811_DEBUG_LEVEL_2)
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#define error(s, f, ...) printf("%s %s: " s "\n", "CCS811", f, ## __VA_ARGS__)
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#define error_dev(s, f, d, ...) printf("%s %s: bus %d, addr %02x - " s "\n", "CCS811", f, d->bus, d->addr, ## __VA_ARGS__)
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#else
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#define error(s, f, ...)
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#define error_dev(s, f, d, ...)
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#endif
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/* CCS811 register addresses */
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#define CCS811_REG_STATUS 0x00
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#define CCS811_REG_MEAS_MODE 0x01
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#define CCS811_REG_ALG_RESULT_DATA 0x02
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#define CCS811_REG_RAW_DATA 0x03
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#define CCS811_REG_ENV_DATA 0x05
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#define CCS811_REG_NTC 0x06
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#define CCS811_REG_THRESHOLDS 0x10
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#define CCS811_REG_BASELINE 0x11
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#define CCS811_REG_HW_ID 0x20
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#define CCS811_REG_HW_VER 0x21
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#define CCS811_REG_FW_BOOT_VER 0x23
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#define CCS811_REG_FW_APP_VER 0x24
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#define CCS811_REG_ERROR_ID 0xe0
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#define CCS811_REG_APP_ERASE 0xf1
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#define CCS811_REG_APP_DATA 0xf2
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#define CCS811_REG_APP_VERIFY 0xf3
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#define CCS811_REG_APP_START 0xf4
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#define CCS811_REG_SW_RESET 0xff
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// status register bits
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#define CCS811_STATUS_ERROR 0x01 // error, details in CCS811_REG_ERROR
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#define CCS811_STATUS_DATA_RDY 0x08 // new data sample in ALG_RESULT_DATA
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#define CCS811_STATUS_APP_VALID 0x10 // valid application firmware loaded
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#define CCS811_STATUS_FW_MODE 0x80 // firmware is in application mode
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// error register bits
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#define CCS811_ERR_WRITE_REG_INV 0x01 // invalid register address on write
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#define CCS811_ERR_READ_REG_INV 0x02 // invalid register address on read
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#define CCS811_ERR_MEASMODE_INV 0x04 // invalid requested measurement mode
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#define CCS811_ERR_MAX_RESISTANCE 0x08 // maximum sensor resistance exceeded
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#define CCS811_ERR_HEATER_FAULT 0x10 // heater current not in range
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#define CCS811_ERR_HEATER_SUPPLY 0x20 // heater voltage not applied correctly
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/**
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* Type declarations
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*/
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typedef struct
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{
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uint8_t reserved_1 :2;
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uint8_t int_thresh :1; // interrupt if new ALG_RESULT_DAT crosses on of the thresholds
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uint8_t int_datardy:1; // interrupt if new sample is ready in ALG_RESULT_DAT
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uint8_t drive_mode :3; // mode number binary coded
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} ccs811_meas_mode_reg_t;
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/**
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* forward declaration of functions for internal use only
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*/
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static bool ccs811_reg_read(ccs811_sensor_t* dev, uint8_t reg, uint8_t *data, uint32_t len);
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static bool ccs811_reg_write(ccs811_sensor_t* dev, uint8_t reg, uint8_t *data, uint32_t len);
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static bool ccs811_check_error_status (ccs811_sensor_t* dev);
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static bool ccs811_enable_threshold (ccs811_sensor_t* dev, bool enabled);
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static bool ccs811_is_available (ccs811_sensor_t* dev);
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ccs811_sensor_t* ccs811_init_sensor (uint8_t bus, uint8_t addr)
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{
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ccs811_sensor_t* dev;
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if ((dev = malloc (sizeof(ccs811_sensor_t))) == NULL)
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return NULL;
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// init sensor data structure
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dev->bus = bus;
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dev->addr = addr;
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dev->mode = ccs811_mode_idle;
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dev->error_code = CCS811_OK;
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// check whether sensor is available including the check of the hardware
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// id and the error state
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if (!ccs811_is_available(dev))
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{
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error_dev("Sensor is not available.", __FUNCTION__, dev);
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free (dev);
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return NULL;
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}
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const static uint8_t sw_reset[4] = { 0x11, 0xe5, 0x72, 0x8a };
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// doing a software reset first
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if (!ccs811_reg_write(dev, CCS811_REG_SW_RESET, (uint8_t*)sw_reset, 4))
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{
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error_dev("Could not reset the sensor.", __FUNCTION__, dev);
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free (dev);
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return NULL;
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}
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uint8_t status;
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// wait 100 ms after the reset
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vTaskDelay(100/portTICK_PERIOD_MS);
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// get the status to check whether sensor is in bootloader mode
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if (!ccs811_reg_read(dev, CCS811_REG_STATUS, &status, 1))
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{
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error_dev("Could not read status register %02x.", __FUNCTION__, dev, CCS811_REG_STATUS);
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free (dev);
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return NULL;
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}
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// if sensor is in bootloader mode (FW_MODE == 0), it has to switch
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// to the application mode first
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if (!(status & CCS811_STATUS_FW_MODE))
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{
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// check whether valid application firmware is loaded
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if (!(status & CCS811_STATUS_APP_VALID))
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{
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error_dev("Sensor is in boot mode, but has no valid application.",
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__FUNCTION__, dev);
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free (dev);
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return NULL;
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}
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// swtich to application mode
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if (!ccs811_reg_write(dev, CCS811_REG_APP_START, 0, 0))
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{
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error_dev("Could not start application", __FUNCTION__, dev);
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free (dev);
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return NULL;
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}
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// wait 100 ms after starting the app
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vTaskDelay(100/portTICK_PERIOD_MS);
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// get the status to check whether sensor switched to application mode
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if (!ccs811_reg_read(dev, CCS811_REG_STATUS, &status, 1) ||
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!(status & CCS811_STATUS_FW_MODE))
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{
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error_dev("Could not start application.", __FUNCTION__, dev);
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free (dev);
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return NULL;
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}
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}
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// try to set default measurement mode to *ccs811_mode_1s*
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if (!ccs811_set_mode(dev, ccs811_mode_1s))
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{
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free (dev);
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return NULL;
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}
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return dev;
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}
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bool ccs811_set_mode (ccs811_sensor_t* dev, ccs811_mode_t mode)
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{
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ccs811_meas_mode_reg_t reg;
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if (!dev) return false;
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dev->error_code = CCS811_OK;
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// read measurement mode register value
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if (!ccs811_reg_read(dev, CCS811_REG_MEAS_MODE, (uint8_t*)®, 1))
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return false;
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reg.drive_mode = mode;
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// write back measurement mode register
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if (!ccs811_reg_write(dev, CCS811_REG_MEAS_MODE, (uint8_t*)®, 1))
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{
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error_dev ("Could not set measurement mode.", __FUNCTION__, dev);
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return false;
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}
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// check whether setting measurement mode were succesfull
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if (!ccs811_reg_read(dev, CCS811_REG_MEAS_MODE, (uint8_t*)®, 1) ||
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reg.drive_mode != mode)
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{
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error_dev ("Could not set measurement mode to %d", __FUNCTION__, dev, mode);
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return ccs811_check_error_status (dev);
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}
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dev->mode = mode;
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return true;
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}
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#define CCS811_ALG_DATA_ECO2_HB 0
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#define CCS811_ALG_DATA_ECO2_LB 1
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#define CCS811_ALG_DATA_TVOC_HB 2
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#define CCS811_ALG_DATA_TVOC_LB 3
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#define CCS811_ALG_DATA_STATUS 4
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#define CCS811_ALG_DATA_ERROR_ID 5
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#define CCS811_ALG_DATA_RAW_HB 6
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#define CCS811_ALG_DATA_RAW_LB 7
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bool ccs811_get_results (ccs811_sensor_t* dev,
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uint16_t* iaq_tvoc,
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uint16_t* iaq_eco2,
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uint8_t* raw_i,
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uint16_t* raw_v)
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{
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if (!dev) return false;
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dev->error_code = CCS811_OK;
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if (dev->mode == ccs811_mode_idle)
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{
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error_dev ("Sensor is in idle mode and not performing measurements.",
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__FUNCTION__, dev);
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dev->error_code = CCS811_DRV_WRONG_MODE;
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return false;
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}
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if (dev->mode == ccs811_mode_250ms && (iaq_tvoc || iaq_eco2))
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{
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error_dev ("Sensor is in constant power mode, only raw data "
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"are available every 250ms",
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__FUNCTION__, dev);
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dev->error_code = CCS811_DRV_NO_IAQ_DATA;
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return false;
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}
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uint8_t data[8];
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// read IAQ sensor values and RAW sensor data including status and error id
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if (!ccs811_reg_read(dev, CCS811_REG_ALG_RESULT_DATA, data, 8))
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{
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error_dev ("Could not read sensor data.", __FUNCTION__, dev);
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dev->error_code |= CCS811_DRV_RD_DATA_FAILED;
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return false;
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}
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// check for errors
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if (data[CCS811_ALG_DATA_STATUS] & CCS811_STATUS_ERROR)
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{
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return ccs811_check_error_status (dev);
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}
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// check whether new data are ready, if not, latest values are read from sensor
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// and error_code is set
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if (!(data[CCS811_ALG_DATA_STATUS] & CCS811_STATUS_DATA_RDY))
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{
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debug_dev ("No new data.", __FUNCTION__, dev);
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dev->error_code = CCS811_DRV_NO_NEW_DATA;
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}
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// if *iaq* is not NULL return IAQ sensor values
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if (iaq_tvoc) *iaq_tvoc = data[CCS811_ALG_DATA_TVOC_HB] << 8 | data[CCS811_ALG_DATA_TVOC_LB];
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if (iaq_eco2) *iaq_eco2 = data[CCS811_ALG_DATA_ECO2_HB] << 8 | data[CCS811_ALG_DATA_ECO2_LB];
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// if *raw* is not NULL return RAW sensor data
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if (raw_i) *raw_i = data[CCS811_ALG_DATA_RAW_HB] >> 2;
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if (raw_v) *raw_v = (data[CCS811_ALG_DATA_RAW_HB] & 0x03) << 8 | data[CCS811_ALG_DATA_RAW_LB];
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return true;
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}
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uint32_t ccs811_get_ntc_resistance (ccs811_sensor_t* dev, uint32_t r_ref)
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{
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if (!dev) return 0;
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uint8_t data[4];
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// read baseline register
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if (!ccs811_reg_read(dev, CCS811_REG_NTC, data, 4))
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return 0;
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// calculation from application note ams AN000372
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uint16_t v_ref = (uint16_t)(data[0]) << 8 | data[1];
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uint16_t v_ntc = (uint16_t)(data[2]) << 8 | data[3];
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return (v_ntc * r_ref / v_ref);
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}
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bool ccs811_set_environmental_data (ccs811_sensor_t* dev,
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float temperature,
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float humidity)
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{
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if (!dev) return false;
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uint16_t temp = (temperature + 25) * 512; // -25 °C maps to 0
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uint16_t hum = humidity * 512;
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// fill environmental data
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uint8_t data[4] = { temp >> 8, temp & 0xff,
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hum >> 8, hum & 0xff };
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// send environmental data to the sensor
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if (!ccs811_reg_write(dev, CCS811_REG_ENV_DATA, data, 4))
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{
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error_dev ("Could not write environmental data to sensor.", __FUNCTION__, dev);
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return false;
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}
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return true;
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}
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bool ccs811_set_eco2_thresholds (ccs811_sensor_t* dev,
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uint16_t low, uint16_t high, uint8_t hysteresis)
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{
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if (!dev) return false;
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dev->error_code = CCS811_OK;
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// check whether interrupt has to be disabled
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if (!low && !high && !hysteresis)
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return ccs811_enable_threshold (dev, false);
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// check parameters
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if (low < CCS_ECO2_RANGE_MIN || high > CCS_ECO2_RANGE_MAX || low > high || !hysteresis)
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{
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error_dev ("Wrong threshold parameters", __FUNCTION__, dev);
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dev->error_code = CCS811_DRV_WRONG_PARAMS;
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return ccs811_enable_threshold (dev, false);
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}
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// fill the threshold data
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uint8_t data[5] = { low >> 8, low & 0xff,
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high >> 8, high & 0xff,
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hysteresis };
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// write threshold data to the sensor
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if (!ccs811_reg_write(dev, CCS811_REG_THRESHOLDS, data, 5))
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{
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error_dev ("Could not write threshold interrupt data to sensor.", __FUNCTION__, dev);
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return ccs811_enable_threshold (dev, false);
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}
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// finally enable the threshold interrupt mode
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return ccs811_enable_threshold (dev, true);
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}
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bool ccs811_enable_interrupt (ccs811_sensor_t* dev, bool enabled)
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{
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if (!dev) return false;
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ccs811_meas_mode_reg_t reg;
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// read measurement mode register value
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if (!ccs811_reg_read(dev, CCS811_REG_MEAS_MODE, (uint8_t*)®, 1))
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return false;
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reg.int_datardy = enabled;
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reg.int_thresh = false; // threshold mode must not enabled
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// write back measurement mode register
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if (!ccs811_reg_write(dev, CCS811_REG_MEAS_MODE, (uint8_t*)®, 1))
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{
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error_dev ("Could not set measurment mode register.", __FUNCTION__, dev);
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return false;
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}
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return true;
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}
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uint16_t ccs811_get_baseline (ccs811_sensor_t* dev)
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{
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if (!dev) return 0;
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uint8_t data[2];
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// read baseline register
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if (!ccs811_reg_read(dev, CCS811_REG_BASELINE, data, 2))
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return 0;
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return (uint16_t)(data[0]) << 8 | data[1];
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}
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bool ccs811_set_baseline (ccs811_sensor_t* dev, uint16_t baseline)
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{
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if (!dev) return false;
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uint8_t data[2] = { baseline >> 8, baseline & 0xff };
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// write baseline register
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if (!ccs811_reg_write(dev, CCS811_REG_BASELINE, data, 2))
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return false;
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return true;
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}
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/**
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* FUNCTIONS FOR INTERNAL USE ONLY
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*/
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static bool ccs811_enable_threshold (ccs811_sensor_t* dev, bool enabled)
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{
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if (!dev) return false;
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ccs811_meas_mode_reg_t reg;
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// first, enable/disable the data ready interrupt
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if (!ccs811_enable_interrupt (dev, enabled))
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return false;
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// read measurement mode register value
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if (!ccs811_reg_read(dev, CCS811_REG_MEAS_MODE, (uint8_t*)®, 1))
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return false;
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// second, enable/disable the threshold interrupt mode
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reg.int_thresh = enabled;
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// write back measurement mode register
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if (!ccs811_reg_write(dev, CCS811_REG_MEAS_MODE, (uint8_t*)®, 1))
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{
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error_dev ("Could not set measurement mode register.", __FUNCTION__, dev);
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return false;
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}
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return true;
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}
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static bool ccs811_reg_read(ccs811_sensor_t* dev, uint8_t reg, uint8_t *data, uint32_t len)
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{
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if (!dev || !data) return false;
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debug_dev ("Read %d byte from i2c slave starting at reg addr %02x.", __FUNCTION__, dev, len, reg);
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int result = i2c_slave_read(dev->bus, dev->addr, ®, data, len);
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if (result)
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{
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dev->error_code |= (result == -EBUSY) ? CCS811_I2C_BUSY : CCS811_I2C_READ_FAILED;
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error_dev ("Error %d on read %d byte from I2C slave reg addr %02x.",
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__FUNCTION__, dev, result, len, reg);
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return false;
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}
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# ifdef CCS811_DEBUG_LEVEL_2
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printf("CCS811 %s: Read following bytes: ", __FUNCTION__);
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printf("%0x: ", reg);
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for (int i=0; i < len; i++)
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printf("%0x ", data[i]);
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printf("\n");
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# endif
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return true;
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}
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static bool ccs811_reg_write(ccs811_sensor_t* dev, uint8_t reg, uint8_t *data, uint32_t len)
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{
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if (!dev) return false;
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debug_dev ("Write %d bytes to i2c slave starting at reg addr %02x", __FUNCTION__, dev, len, reg);
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# ifdef CCS811_DEBUG_LEVEL_2
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if (data && len)
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{
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printf("CCS811 %s: Write following bytes starting at reg addr %02x: ", __FUNCTION__, reg);
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for (int i=0; i < len; i++)
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printf("%02x ", data[i]);
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printf("\n");
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}
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# endif
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int result = i2c_slave_write(dev->bus, dev->addr, ®, data, len);
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if (result)
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{
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dev->error_code |= (result == -EBUSY) ? CCS811_I2C_BUSY : CCS811_I2C_WRITE_FAILED;
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error_dev ("Error %d on write %d byte to i2c slave register %02x.",
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__FUNCTION__, dev, result, len, reg);
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return false;
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}
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return true;
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}
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static bool ccs811_check_error_status (ccs811_sensor_t* dev)
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{
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if (!dev) return false;
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dev->error_code = CCS811_OK;
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uint8_t status;
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uint8_t err_reg;
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// check status register
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if (!ccs811_reg_read(dev, CCS811_REG_STATUS, &status, 1))
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return false;
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if (!status & CCS811_STATUS_ERROR)
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// everything is fine
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return true;
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// Check the error register
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if (!ccs811_reg_read(dev, CCS811_REG_ERROR_ID, &err_reg, 1))
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return false;
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if (err_reg & CCS811_ERR_WRITE_REG_INV)
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{
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error_dev ("Received an invalid register for write.", __FUNCTION__, dev);
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dev->error_code = CCS811_DRV_WR_REG_INV;
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return false;
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}
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if (err_reg & CCS811_ERR_READ_REG_INV)
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{
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error_dev ("Received an invalid register for read.", __FUNCTION__, dev);
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dev->error_code = CCS811_DRV_RD_REG_INV;
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return false;
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}
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if (err_reg & CCS811_ERR_MEASMODE_INV)
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{
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error_dev ("Received an invalid measurement mode request.", __FUNCTION__, dev);
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dev->error_code = CCS811_DRV_MM_INV;
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return false;
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}
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if (err_reg & CCS811_ERR_MAX_RESISTANCE)
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{
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error_dev ("Sensor resistance measurement has reached"
|
|
" or exceeded the maximum range.", __FUNCTION__, dev);
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dev->error_code = CCS811_DRV_MAX_RESIST;
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return false;
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}
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if (err_reg & CCS811_ERR_HEATER_FAULT)
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{
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error_dev ("Heater current not in range.", __FUNCTION__, dev);
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dev->error_code = CCS811_DRV_HEAT_FAULT;
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return false;
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}
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if (err_reg & CCS811_ERR_HEATER_SUPPLY)
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{
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error_dev ("Heater voltage is not being applied correctly.", __FUNCTION__, dev);
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dev->error_code = CCS811_DRV_HEAT_SUPPLY;
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return false;
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}
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return true;
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}
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static bool ccs811_is_available (ccs811_sensor_t* dev)
|
|
{
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|
if (!dev) return false;
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|
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uint8_t reg_data[5];
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|
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|
// check hardware id (register 0x20) and hardware version (register 0x21)
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|
if (!ccs811_reg_read(dev, CCS811_REG_HW_ID, reg_data, 5))
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return false;
|
|
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|
if (reg_data[0] != 0x81)
|
|
{
|
|
error_dev ("Wrong hardware ID %02x, should be 0x81", __FUNCTION__, dev, reg_data[0]);
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dev->error_code = CCS811_DRV_HW_ID;
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|
return false;
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}
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debug_dev ("hardware version: %02x", __FUNCTION__, dev, reg_data[1]);
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debug_dev ("firmware boot version: %02x", __FUNCTION__, dev, reg_data[3]);
|
|
debug_dev ("firmware app version: %02x", __FUNCTION__, dev, reg_data[4]);
|
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return ccs811_check_error_status (dev);
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}
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