/** * Copyright (c) 2017 - 2019, Nordic Semiconductor ASA * * 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, except as embedded into a Nordic * Semiconductor ASA integrated circuit in a product or a software update for * such product, 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 Nordic Semiconductor ASA nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * 4. This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA 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. * */ #include "ccs811.h" #define SWAP_16(arg) ((arg) = (MSB_16(arg) | (LSB_16(arg) << 8))) ret_code_t ccs811_init(ccs811_instance_t const * p_instance) { ASSERT(p_instance != NULL); if (p_instance->p_sensor_data->p_twi_mngr->p_queue->size < CCS811_MIN_QUEUE_SIZE) { return NRF_ERROR_INVALID_LENGTH; } static uint8_t const send_msg[] = { CCS811_REG_APP_START }; ret_code_t err = nrf_twi_sensor_write(p_instance->p_sensor_data, p_instance->sensor_addr, send_msg, ARRAY_SIZE(send_msg), true); err = ccs811_drive_mode_set(p_instance, CCS811_MODE_0, false, false); if (err != NRF_SUCCESS) { return err; } err = ccs811_env_set(p_instance, CCS811_DEFAULT_TEMPERATURE, 0, CCS811_DEFAULT_HUMIDITY, 0); if (err != NRF_SUCCESS) { return err; } return ccs811_thr_cfg(p_instance, CCS811_DEFAULT_LOW_THR, CCS811_DEFAULT_HIGH_THR, CCS811_DEFAULT_HYSTERESIS); } ret_code_t ccs811_drive_mode_set(ccs811_instance_t const * p_instance, ccs811_drive_mode_t mode, bool drdy_en, bool thr_en) { ASSERT(p_instance != NULL); uint8_t reg = 0; NRF_TWI_SENSOR_REG_SET(reg, CCS811_DRIVE_MODE_MASK, CCS811_DRIVE_MODE_POS, mode); NRF_TWI_SENSOR_REG_SET(reg, CCS811_DATA_READY_MASK, CCS811_DATA_READY_POS, drdy_en); NRF_TWI_SENSOR_REG_SET(reg, CCS811_THRESH_MASK, CCS811_THRESH_POS, thr_en); uint8_t send_msg[] = { CCS811_REG_MEAS_MODE, reg }; return nrf_twi_sensor_write(p_instance->p_sensor_data, p_instance->sensor_addr, send_msg, ARRAY_SIZE(send_msg), true); } ret_code_t ccs811_alg_data_read(ccs811_instance_t const * p_instance, ccs811_data_callback_t user_cb, ccs811_alg_data_t * p_alg_data, ccs811_last_data_byte_t last) { ASSERT(p_instance != NULL); ASSERT(p_alg_data != NULL); return nrf_twi_sensor_reg_read(p_instance->p_sensor_data, p_instance->sensor_addr, CCS811_REG_ALG_RESULT_DATA, (nrf_twi_sensor_reg_cb_t) user_cb, (uint8_t *) p_alg_data, last); } void ccs811_alg_data_process(ccs811_alg_data_t * p_alg_data) { ASSERT(p_alg_data != NULL); SWAP_16(p_alg_data->eco2); SWAP_16(p_alg_data->tvoc); SWAP_16(p_alg_data->raw); } ret_code_t ccs811_env_set(ccs811_instance_t const * p_instance, int8_t temp_value, uint16_t temp_fraction, uint8_t hum_percent, uint16_t hum_fraction) { ASSERT(p_instance != NULL); temp_value += CCS811_TEMPERATURE_OFFSET; if(temp_value < 0) { temp_value = 0; } uint16_t env_temp = ( *((uint16_t *) &temp_value) << CCS811_ENV_TEMP_VALUE_POS) | (temp_fraction & CCS811_ENV_TEMP_FRACTION_MASK); uint16_t env_hum = ( *((uint16_t *) &hum_percent) << CCS811_ENV_HUM_PERCENT_POS) | (hum_fraction & CCS811_ENV_HUM_FRACTION_MASK); uint8_t send_msg[] = { CCS811_REG_ENV_DATA, MSB_16(env_temp), LSB_16(env_temp), MSB_16(env_hum), LSB_16(env_hum) }; return nrf_twi_sensor_write(p_instance->p_sensor_data, p_instance->sensor_addr, send_msg, ARRAY_SIZE(send_msg), true); } ret_code_t ccs811_thr_cfg(ccs811_instance_t const * p_instance, uint16_t l_to_m, uint16_t m_to_h, uint8_t hysteresis) { ASSERT(p_instance != NULL); uint8_t send_msg[] = { CCS811_REG_THRESHOLDS, MSB_16(l_to_m), LSB_16(l_to_m), MSB_16(m_to_h), LSB_16(m_to_h), hysteresis }; return nrf_twi_sensor_write(p_instance->p_sensor_data, p_instance->sensor_addr, send_msg, ARRAY_SIZE(send_msg), true); } ret_code_t ccs811_baseline_read(ccs811_instance_t const * p_instance, nrf_twi_sensor_reg_cb_t user_cb, uint16_t * p_baseline) { ASSERT(p_instance != NULL); ASSERT(p_baseline != NULL); return nrf_twi_sensor_reg_read(p_instance->p_sensor_data, p_instance->sensor_addr, CCS811_REG_BASELINE, user_cb, (uint8_t *) p_baseline, 2); } ret_code_t ccs811_baseline_set(ccs811_instance_t const * p_instance, uint16_t baseline) { ASSERT(p_instance != NULL); uint8_t * p_base = (uint8_t *) &baseline; uint8_t send_msg[] = { CCS811_REG_BASELINE, p_base[0], p_base[1] }; return nrf_twi_sensor_write(p_instance->p_sensor_data, p_instance->sensor_addr, send_msg, ARRAY_SIZE(send_msg), true); } ret_code_t ccs811_sw_reset(ccs811_instance_t const * p_instance) { ASSERT(p_instance != NULL); static uint8_t const send_msg[] = { CCS811_REG_SW_RESET, CCS811_SW_RESET_BYTE0, CCS811_SW_RESET_BYTE1, CCS811_SW_RESET_BYTE2, CCS811_SW_RESET_BYTE3 }; return nrf_twi_sensor_write(p_instance->p_sensor_data, p_instance->sensor_addr, send_msg, ARRAY_SIZE(send_msg), true); }