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- /**
- * Copyright (c) 2012 - 2020, 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 "ds1624.h"
- #include "twi_master.h"
- #include "nrf_delay.h"
- /*lint ++flb "Enter library region" */
- #define DS1634_BASE_ADDRESS 0x90 //!< 4 MSBs of the DS1624 TWI address
- #define DS1624_ONESHOT_MODE 0x01 //!< Bit in configuration register for 1-shot mode
- #define DS1624_CONVERSION_DONE 0x80 //!< Bit in configuration register to indicate completed temperature conversion
- static uint8_t m_device_address; //!< Device address in bits [7:1]
- const uint8_t command_access_memory = 0x17; //!< Reads or writes to 256-byte EEPROM memory
- const uint8_t command_access_config = 0xAC; //!< Reads or writes configuration data to configuration register
- const uint8_t command_read_temp = 0xAA; //!< Reads last converted temperature value from temperature register
- const uint8_t command_start_convert_temp = 0xEE; //!< Initiates temperature conversion.
- const uint8_t command_stop_convert_temp = 0x22; //!< Halts temperature conversion.
- /**
- * @brief Function for reading the current configuration of the sensor.
- *
- * @return uint8_t Zero if communication with the sensor failed. Contents (always non-zero) of configuration register (@ref DS1624_ONESHOT_MODE and @ref DS1624_CONVERSION_DONE) if communication succeeded.
- */
- static uint8_t ds1624_config_read(void)
- {
- uint8_t config = 0;
- // Write: command protocol
- if (twi_master_transfer(m_device_address, (uint8_t*)&command_access_config, 1, TWI_DONT_ISSUE_STOP))
- {
- if (twi_master_transfer(m_device_address | TWI_READ_BIT, &config, 1, TWI_ISSUE_STOP)) // Read: current configuration
- {
- // Read succeeded, configuration stored to variable "config"
- }
- else
- {
- // Read failed
- config = 0;
- }
- }
- return config;
- }
- bool ds1624_init(uint8_t device_address)
- {
- bool transfer_succeeded = true;
- m_device_address = DS1634_BASE_ADDRESS + (uint8_t)(device_address << 1);
- uint8_t config = ds1624_config_read();
- if (config != 0)
- {
- // Configure DS1624 for 1SHOT mode if not done so already.
- if (!(config & DS1624_ONESHOT_MODE))
- {
- uint8_t data_buffer[2];
- data_buffer[0] = command_access_config;
- data_buffer[1] = DS1624_ONESHOT_MODE;
- transfer_succeeded &= twi_master_transfer(m_device_address, data_buffer, 2, TWI_ISSUE_STOP);
- }
- }
- else
- {
- transfer_succeeded = false;
- }
- return transfer_succeeded;
- }
- bool ds1624_start_temp_conversion(void)
- {
- return twi_master_transfer(m_device_address, (uint8_t*)&command_start_convert_temp, 1, TWI_ISSUE_STOP);
- }
- bool ds1624_is_temp_conversion_done(void)
- {
- uint8_t config = ds1624_config_read();
- if (config & DS1624_CONVERSION_DONE)
- {
- return true;
- }
- else
- {
- return false;
- }
- }
- bool ds1624_temp_read(int8_t * temperature_in_celcius, int8_t * temperature_fraction)
- {
- bool transfer_succeeded = false;
- // Write: Begin read temperature command
- if (twi_master_transfer(m_device_address, (uint8_t*)&command_read_temp, 1, TWI_DONT_ISSUE_STOP))
- {
- uint8_t data_buffer[2];
- // Read: 2 temperature bytes to data_buffer
- if (twi_master_transfer(m_device_address | TWI_READ_BIT, data_buffer, 2, TWI_ISSUE_STOP))
- {
- *temperature_in_celcius = (int8_t)data_buffer[0];
- *temperature_fraction = (int8_t)data_buffer[1];
- transfer_succeeded = true;
- }
- }
- return transfer_succeeded;
- }
- /*lint --flb "Leave library region" */
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