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);
+    }
+}