diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/components/ble/ble_services/eddystone/es_battery_voltage_saadc.c')
-rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/components/ble/ble_services/eddystone/es_battery_voltage_saadc.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/ble/ble_services/eddystone/es_battery_voltage_saadc.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/ble/ble_services/eddystone/es_battery_voltage_saadc.c new file mode 100644 index 0000000..71502da --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/ble/ble_services/eddystone/es_battery_voltage_saadc.c @@ -0,0 +1,104 @@ +/** + * Copyright (c) 2016 - 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 "es_battery_voltage.h" +#include "nrf_drv_saadc.h" +#include "sdk_macros.h" + +#define ADC_REF_VOLTAGE_IN_MILLIVOLTS 600 //!< Reference voltage (in milli volts) used by ADC while doing conversion. +#define DIODE_FWD_VOLT_DROP_MILLIVOLTS 270 //!< Typical forward voltage drop of the diode (Part no: SD103ATW-7-F) that is connected in series with the voltage supply. This is the voltage drop when the forward current is 1mA. Source: Data sheet of 'SURFACE MOUNT SCHOTTKY BARRIER DIODE ARRAY' available at www.diodes.com. +#define ADC_RES_10BIT 1024 //!< Maximum digital value for 10-bit ADC conversion. +#define ADC_PRE_SCALING_COMPENSATION 6 //!< The ADC is configured to use VDD with 1/3 prescaling as input. And hence the result of conversion is to be multiplied by 3 to get the actual value of the battery voltage. +#define ADC_RESULT_IN_MILLI_VOLTS(ADC_VALUE) \ + ((((ADC_VALUE) *ADC_REF_VOLTAGE_IN_MILLIVOLTS) / ADC_RES_10BIT) * ADC_PRE_SCALING_COMPENSATION) + +static nrf_saadc_value_t adc_buf; //!< Buffer used for storing ADC value. +static uint16_t m_batt_lvl_in_milli_volts; //!< Current battery level. + +/**@brief Function handling events from 'nrf_drv_saadc.c'. + * + * @param[in] p_evt SAADC event. + */ +static void saadc_event_handler(nrf_drv_saadc_evt_t const * p_evt) +{ + if (p_evt->type == NRF_DRV_SAADC_EVT_DONE) + { + nrf_saadc_value_t adc_result; + + adc_result = p_evt->data.done.p_buffer[0]; + + m_batt_lvl_in_milli_volts = + ADC_RESULT_IN_MILLI_VOLTS(adc_result) + DIODE_FWD_VOLT_DROP_MILLIVOLTS; + } +} + + +void es_battery_voltage_init(void) +{ + ret_code_t err_code = nrf_drv_saadc_init(NULL, saadc_event_handler); + + APP_ERROR_CHECK(err_code); + + nrf_saadc_channel_config_t config = + NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_VDD); + err_code = nrf_drv_saadc_channel_init(0, &config); + APP_ERROR_CHECK(err_code); + + err_code = nrf_drv_saadc_buffer_convert(&adc_buf, 1); + APP_ERROR_CHECK(err_code); + + err_code = nrf_drv_saadc_sample(); + APP_ERROR_CHECK(err_code); +} + + +void es_battery_voltage_get(uint16_t * p_vbatt) +{ + VERIFY_PARAM_NOT_NULL_VOID(p_vbatt); + + *p_vbatt = m_batt_lvl_in_milli_volts; + if (!nrf_drv_saadc_is_busy()) + { + ret_code_t err_code = nrf_drv_saadc_buffer_convert(&adc_buf, 1); + APP_ERROR_CHECK(err_code); + + err_code = nrf_drv_saadc_sample(); + APP_ERROR_CHECK(err_code); + } +} |