diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/ds1624/ds1624.c')
-rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/ds1624/ds1624.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/ds1624/ds1624.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/ds1624/ds1624.c new file mode 100644 index 0000000..ac4da3b --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/drivers_ext/ds1624/ds1624.c @@ -0,0 +1,154 @@ +/** + * Copyright (c) 2012 - 2018, 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" */ |