Greetings everyone,
I am a beginner in this and would like to ask for help in reading battery level.
Battery info: 3.7V, 100mAh, 0.37wh.
/**
* Copyright (c) 2014 - 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.
*
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/** @file
*
* @defgroup ble_sdk_app_template_main main.c
* @{
* @ingroup ble_sdk_app_template
* @brief Template project main file.
*
* This file contains a template for creating a new application. It has the code necessary to
* advertise, get a connection restart advertising on disconnect and if no new
* connection created go back to system-off mode.
* It can easily be used as a starting point for creating a new application, the comments identified
* with 'YOUR_JOB' indicates where and how you can customize.
*/
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "nrf.h"
#include "nrf_drv_saadc.h"
#include "ble_srv_common.h"
#include "nordic_common.h"
#include "nrf.h"
#include "app_error.h"
#include "ble.h"
#include "ble_hci.h"
#include "ble_srv_common.h"
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "nrf_sdh.h"
#include "nrf_sdh_soc.h"
#include "nrf_sdh_ble.h"
#include "app_timer.h"
#include "fds.h"
#include "peer_manager.h"
#include "bsp_btn_ble.h"
#include "sensorsim.h"
#include "ble_conn_state.h"
#include "nrf_ble_gatt.h"
#include "nrf_ble_qwr.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_drv_twi.h"
#include "nrf_delay.h"
#include "ble_bas.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#include "ble_cus.h"
/* Sensor Declarations*/
#include "mlx90632.h"
#define DEVICE_NAME "abc" /**< Name of device. Will be included in the advertising data. */
#define MANUFACTURER_NAME "NordicSemiconductor" /**< Manufacturer. Will be passed to Device Information Service. */
#define APP_ADV_INTERVAL 300 /**< The advertising interval (in units of 0.625 ms. This value corresponds to 187.5 ms). */
#define APP_ADV_DURATION 0 /**< The advertising duration. 0 means forever advertising */
#define APP_BLE_OBSERVER_PRIO 3 /**< Application's BLE observer priority. You shouldn't need to modify this value. */
#define APP_BLE_CONN_CFG_TAG 1 /**< A tag identifying the SoftDevice BLE configuration. */
#define MIN_CONN_INTERVAL MSEC_TO_UNITS(100, UNIT_1_25_MS) /**< Minimum acceptable connection interval (0.1 seconds). */
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(200, UNIT_1_25_MS) /**< Maximum acceptable connection interval (0.2 second). */
#define SLAVE_LATENCY 0 /**< Slave latency. */
#define CONN_SUP_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Connection supervisory timeout (4 seconds). */
#define FIRST_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(5000) /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY APP_TIMER_TICKS(30000) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT 3 /**< Number of attempts before giving up the connection parameter negotiation. */
#define NOTIFICATION_INTERVAL APP_TIMER_TICKS(1000) // Change here accordingly to how often you want to measure. Current: 60 seconds/1 minute
#define BATTERY_LEVEL_MEAS_INTERVAL APP_TIMER_TICKS(2000) /**< Battery level measurement interval (ticks) */
#define BATTERY_LEVEL_INCREMENT 1
#define SEC_PARAM_BOND 1 /**< Perform bonding. */
#define SEC_PARAM_MITM 0 /**< Man In The Middle protection not required. */
#define SEC_PARAM_LESC 0 /**< LE Secure Connections not enabled. */
#define SEC_PARAM_KEYPRESS 0 /**< Keypress notifications not enabled. */
#define SEC_PARAM_IO_CAPABILITIES BLE_GAP_IO_CAPS_NONE /**< No I/O capabilities. */
#define SEC_PARAM_OOB 0 /**< Out Of Band data not available. */
#define SEC_PARAM_MIN_KEY_SIZE 7 /**< Minimum encryption key size. */
#define SEC_PARAM_MAX_KEY_SIZE 16 /**< Maximum encryption key size. */
#define ADC_REF_VOLTAGE_IN_MILLIVOLTS 600 /**< Reference voltage (in milli volts) used by ADC while doing 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 DIODE_FWD_VOLT_DROP_MILLIVOLTS 270 /**< Typical forward voltage drop of the diode . */
#define ADC_RES_10BIT 1024 /**< Maximum digital value for 10-bit ADC conversion. */
#define DEAD_BEEF 0xDEADBEEF /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
/* TWI (two-wire-interface) instance ID. */
#define TWI_INSTANCE_ID 0
/* I2C Addresses definition of temperature sensor. */
#define SensorAdress (0x3A)
NRF_BLE_GATT_DEF(m_gatt);
NRF_BLE_QWR_DEF(m_qwr); /**< GATT module instance. */
BLE_CUS_DEF(m_cus); /**< Context for the Queued Write module.*/
BLE_ADVERTISING_DEF(m_advertising); /**< Advertising module instance. */
BLE_BAS_DEF(m_bas); /**< Structure used to identify the battery service. */
/**@brief Macro to convert the result of analog-to-digital converter (ADC) conversion in millivolts. NEED?
*
* @param[in] ADC_VALUE ADC result.
*
* @retval Result converted to millivolts.
*/
#define ADC_RESULT_IN_MILLI_VOLTS(ADC_VALUE) \
((((ADC_VALUE)*ADC_REF_VOLTAGE_IN_MILLIVOLTS) / ADC_RES_10BIT) * ADC_PRE_SCALING_COMPENSATION)
//define the timer for notification reading of temperature
APP_TIMER_DEF(m_notification_timer_id);
APP_TIMER_DEF(m_battery_timer_id); /**< Battery timer. */
/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID); //initialise the twi instance
double pre_ambient, pre_object, ambient, object; //initialise these variables to be a double variable for temperature calculation
static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID; /**< Handle of the current connection. */
static nrf_saadc_value_t adc_buf[2];
/* YOUR_JOB: Declare all services structure your application is using
* BLE_XYZ_DEF(m_xyz);
*/
// YOUR_JOB: Use UUIDs for service(s) used in your application.
static ble_uuid_t m_adv_uuids[] = /**< Universally unique service identifiers. */
{
{CUSTOM_SERVICE_UUID, BLE_UUID_TYPE_VENDOR_BEGIN},
{BLE_UUID_BATTERY_SERVICE, BLE_UUID_TYPE_BLE}
};
/*//initialise these variables to be a 16bit integer variable for temperature calculation*/
int16_t ambient_new_raw;
int16_t ambient_old_raw;
int16_t object_new_raw;
int16_t object_old_raw;
//result is the 32bit unsigned integer after calculation
uint32_t result;
//eeprom values - start. Initialise accordingly to the different number of bits. 16 vs 32.
//They are integer type.
int32_t PR=0;
int32_t PG=0;
int32_t PT=0;
int32_t PO=0;
int32_t Ea=0;
int32_t Eb=0;
int32_t Fa=0;
int32_t Fb=0;
int32_t Ga=0;
int16_t Ha=0;
int16_t Hb=0;
int16_t Gb=0;
int16_t Ka=0;
//eeprom-values - end
static void advertising_start(bool erase_bonds);
/**@brief Callback function for asserts in the SoftDevice.
*
* @details This function will be called in case of an assert in the SoftDevice.
*
* @warning This handler is an example only and does not fit a final product. You need to analyze
* how your product is supposed to react in case of Assert.
* @warning On assert from the SoftDevice, the system can only recover on reset.
*
* @param[in] line_num Line number of the failing ASSERT call.
* @param[in] file_name File name of the failing ASSERT call.
*/
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
app_error_handler(DEAD_BEEF, line_num, p_file_name);
}
/**
* @brief TWI events handler.
This function is not called as we do not need to print these following statements as
it is connecting to a bluetooth device.
*/
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
printf("Temperature of the object : %d Celsius degrees.", object);
printf("Ambient temperature : %d Celsius degrees.", ambient);
}
/**@brief Function for putting the chip into sleep mode.
*
* @note This function will not return.
*/
static void sleep_mode_enter(void)
{
ret_code_t err_code;
err_code = bsp_indication_set(BSP_INDICATE_IDLE);
APP_ERROR_CHECK(err_code);
// Prepare wakeup buttons.
err_code = bsp_btn_ble_sleep_mode_prepare();
APP_ERROR_CHECK(err_code);
// Go to system-off mode (this function will not return; wakeup will cause a reset).
err_code = sd_power_system_off();
APP_ERROR_CHECK(err_code);
}
void twi_init(void) {
ret_code_t err_code;
const nrf_drv_twi_config_t twi_config = {
.scl = I2C_SCL, //pin 27 as of now. Change accordingly. Refer to components/boards/pca10040.h
.sda = I2C_SDA, //pin 26 as of now. Change accordingly. Refer to components/boards/pca10040.h
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false};
//No handler as of now
err_code = nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);
APP_ERROR_CHECK(err_code);
//enable the twi instance after initialise
nrf_drv_twi_enable(&m_twi);
}
//temperature sensor i2c read function for 16 bit register address
int16_t mlx90632_i2c_read(uint16_t register_address, uint16_t *value)
{
//rx_buf means read transfer_buffer. Set it to an array of size 2 because we are
//reading/transfer one byte by one byte. So we will need 2 byte. Note 1 byte = 8 bits.
//this variable is to store the content of the register address. Act as a buffer.
uint8_t rx_buf[2] = {0};
//As we are reading in 16 bit register address in this function, we would also need to
//break it into 2 different bytes, and hence reg is a size of 2. We would also need to
//shift the bits around so that we can read them properly.
uint8_t reg[2] = {register_address>>8, register_address & 0x00FF};
//Initialise the err_code to be a return in this function
ret_code_t err_code;
/* Writing to pointer byte of our register address. */
err_code = nrf_drv_twi_tx(&m_twi, SensorAdress, reg , 2, true);
APP_ERROR_CHECK(err_code);
nrf_delay_ms(50);
//Then we read the values for real and store into the pointer of the first element in
//rx_buff.
err_code = nrf_drv_twi_rx(&m_twi, SensorAdress, &rx_buf[0], 2);
APP_ERROR_CHECK(err_code);
nrf_delay_ms(50);
//shift the bits accordingly and store into the pointer of value parameter.
//This is our final output, not the buffer.
*value= rx_buf[0]<<8|rx_buf[1];
//return to see if there is any error.
return err_code;
}
/* Implementation of I2C read for 32-bit values. Logic is the same as the previous function. */
int32_t mlx90632_i2c_read32(uint16_t register_address, uint32_t *value)
{
//same logic: 32 bits now --> 4 bytes --> buffer size of 4
uint8_t rx_buf[4] = {0};
uint16_t addr16high = register_address;
uint16_t addr16low = register_address+1;
//shift the bits accordingly
uint8_t reg1[2] = {addr16high>>8, addr16high & 0x00FF};
uint8_t reg2[2] = {addr16low>>8,addr16low & 0x00FF};
ret_code_t err_code;
/* Writing to pointer byte. */
//do the first 16 bits
err_code = nrf_drv_twi_tx(&m_twi, SensorAdress, reg1 , 2, true);
APP_ERROR_CHECK(err_code);
nrf_delay_ms(50);
err_code = nrf_drv_twi_rx(&m_twi, SensorAdress, &rx_buf[0], 4);
APP_ERROR_CHECK(err_code);
nrf_delay_ms(50);
//do the next 16 bits
err_code = nrf_drv_twi_tx(&m_twi, SensorAdress, reg2 , 2, true);
APP_ERROR_CHECK(err_code);
nrf_delay_ms(50);
err_code = nrf_drv_twi_rx(&m_twi, SensorAdress, &rx_buf[2], 4);
APP_ERROR_CHECK(err_code);
nrf_delay_ms(50);
//bits shifting accordingly (MSB VS LSB)
*value= rx_buf[2]<<24|rx_buf[3]<<16|rx_buf[0]<<8|rx_buf[1];
return err_code;
}
/* Implementation of I2C write for 16-bit values */
int32_t mlx90632_i2c_write(int16_t register_address, uint16_t value) {
uint8_t data[2];
ret_code_t err_code;
//bits shifting
data[0] = value >> 8;
data[1] = value & 0x00FF;
//do not need to read so only nrf_drv_twi_tx is needed
err_code =nrf_drv_twi_tx(&m_twi, SensorAdress, data , 2, true);
nrf_delay_ms(50);
return err_code;
}
/* Implementation of reading all calibration parameters/EEPROM values for calculation of Ta and To */
static int mlx90632_read_eeprom(int32_t *PR, int32_t *PG, int32_t *PO, int32_t *PT, int32_t *Ea, int32_t *Eb, int32_t *Fa, int32_t *Fb, int32_t *Ga, int16_t *Gb, int16_t *Ha, int16_t *Hb, int16_t *Ka)
{
int32_t ret;
ret = mlx90632_i2c_read32(MLX90632_EE_P_R, (uint32_t *) PR);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read32(MLX90632_EE_P_G, (uint32_t *) PG);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read32(MLX90632_EE_P_O, (uint32_t *) PO);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read32(MLX90632_EE_P_T, (uint32_t *) PT);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read32(MLX90632_EE_Ea, (uint32_t *) Ea);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read32(MLX90632_EE_Eb, (uint32_t *) Eb);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read32(MLX90632_EE_Fa, (uint32_t *) Fa);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read32(MLX90632_EE_Fb, (uint32_t *) Fb);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read32(MLX90632_EE_Ga, (uint32_t *) Ga);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read(MLX90632_EE_Gb, (uint16_t *) Gb);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read(MLX90632_EE_Ha, (uint16_t *) Ha);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read(MLX90632_EE_Hb, (uint16_t *) Hb);
if(ret < 0)
return ret;
ret = mlx90632_i2c_read(MLX90632_EE_Ka, (uint16_t *) Ka);
if(ret < 0)
return ret;
return 0;
}
void usleep(int min_range, int max_range) {
while(--min_range);
}
/**@brief Function for handling Peer Manager events.
*
* @param[in] p_evt Peer Manager event.
*/
static void pm_evt_handler(pm_evt_t const * p_evt)
{
ret_code_t err_code;
switch (p_evt->evt_id)
{
case PM_EVT_BONDED_PEER_CONNECTED:
{
NRF_LOG_INFO("Connected to a previously bonded device.");
} break;
case PM_EVT_CONN_SEC_SUCCEEDED:
{
NRF_LOG_INFO("Connection secured: role: %d, conn_handle: 0x%x, procedure: %d.",
ble_conn_state_role(p_evt->conn_handle),
p_evt->conn_handle,
p_evt->params.conn_sec_succeeded.procedure);
} break;
case PM_EVT_CONN_SEC_FAILED:
{
/* Often, when securing fails, it shouldn't be restarted, for security reasons.
* Other times, it can be restarted directly.
* Sometimes it can be restarted, but only after changing some Security Parameters.
* Sometimes, it cannot be restarted until the link is disconnected and reconnected.
* Sometimes it is impossible, to secure the link, or the peer device does not support it.
* How to handle this error is highly application dependent. */
} break;
case PM_EVT_CONN_SEC_CONFIG_REQ:
{
// Reject pairing request from an already bonded peer.
pm_conn_sec_config_t conn_sec_config = {.allow_repairing = false};
pm_conn_sec_config_reply(p_evt->conn_handle, &conn_sec_config);
} break;
case PM_EVT_STORAGE_FULL:
{
// Run garbage collection on the flash.
err_code = fds_gc();
if (err_code == FDS_ERR_NO_SPACE_IN_QUEUES)
{
// Retry.
}
else
{
APP_ERROR_CHECK(err_code);
}
} break;
case PM_EVT_PEERS_DELETE_SUCCEEDED:
{
advertising_start(false);
} break;
case PM_EVT_PEER_DATA_UPDATE_FAILED:
{
// Assert.
APP_ERROR_CHECK(p_evt->params.peer_data_update_failed.error);
} break;
case PM_EVT_PEER_DELETE_FAILED:
{
// Assert.
APP_ERROR_CHECK(p_evt->params.peer_delete_failed.error);
} break;
case PM_EVT_PEERS_DELETE_FAILED:
{
// Assert.
APP_ERROR_CHECK(p_evt->params.peers_delete_failed_evt.error);
} break;
case PM_EVT_ERROR_UNEXPECTED:
{
// Assert.
APP_ERROR_CHECK(p_evt->params.error_unexpected.error);
} break;
case PM_EVT_CONN_SEC_START:
case PM_EVT_PEER_DATA_UPDATE_SUCCEEDED:
case PM_EVT_PEER_DELETE_SUCCEEDED:
case PM_EVT_LOCAL_DB_CACHE_APPLIED:
case PM_EVT_LOCAL_DB_CACHE_APPLY_FAILED:
// This can happen when the local DB has changed.
case PM_EVT_SERVICE_CHANGED_IND_SENT:
case PM_EVT_SERVICE_CHANGED_IND_CONFIRMED:
default:
break;
}
}
//This function is to handle all the operations of the temperature sensor
//This includes the reading of the RAM values, calculating the ambient and the object
//values
void handling_sensor(){
mlx90632_read_temp_raw(&ambient_new_raw, &ambient_old_raw, &object_new_raw, &object_old_raw);
pre_ambient = mlx90632_preprocess_temp_ambient(ambient_new_raw, ambient_old_raw, Gb);
pre_object = mlx90632_preprocess_temp_object(object_new_raw, object_old_raw, ambient_new_raw, ambient_old_raw, Ka);
mlx90632_set_emissivity(1.0);
ambient = mlx90632_calc_temp_ambient(ambient_new_raw, ambient_old_raw, PT, PR, PG, PO, Gb);
object = mlx90632_calc_temp_object(pre_object, pre_ambient, Ea, Eb, Ga, Fa, Fb, Ha, Hb);
}
/**@brief Function for handling the temperature measurement timer timeout.
*
* @details This function will be called each time our notification_interval expires.
Currently: 60 seconds
*
* @param[in] p_context Pointer used for passing some arbitrary information (context) from the
* app_start_timer() call to the timeout handler.
*/
static void notification_timeout_handler(void * p_context)
{
UNUSED_PARAMETER(p_context);
ret_code_t err_code;
//This is to include the decimal points in the reading
object = object * 100;
//6 is set as we have 4 numbers. The number must be at least higher than the
//number of bytes we want to send but also not recommend to have such a big size.
//Hence 6 for some buffer.
uint8_t array_send[6];
//send in string format, initialisation
sprintf(array_send,"%f", object);
//reading/caculation starts here after initialising and timeout of 60seconds
handling_sensor();
err_code = ble_cus_custom_value_update(&m_cus, &array_send);
if (err_code != NRF_ERROR_INVALID_STATE) {
APP_ERROR_CHECK(err_code);
}
//%lf --> long float
printf("\nTemperature of the object : %lf Celsius degrees.", object);
printf("\nAmbient temperature : %lf Celsius degrees.", ambient);
}
/* Battery Level Calculator by converting millivolts to percentage. Device only has an LDO so can
only step down voltage to 3.3V usable, thus 4.1V (a bit less than 4.2V) is 100% and 3.3V is 0%*/
static __INLINE uint8_t battery_percent_calculator(const uint16_t mvolts) {
uint8_t battery_level;
//whats with the random numbers of 42, 18, etc, reflecting probably but why these specific numbers then?
if (mvolts >= 4100) {
battery_level = 100;
} else if (mvolts > 3600) {
battery_level = 100 - ((4100 - mvolts) * 58) / 500; //100 - 57.89 for 3601 mvolts
} else if (mvolts > 3500) {
battery_level = 42 - ((3600 - mvolts) * 24) / 160;
} else if (mvolts > 3350) {
battery_level = 18 - ((3500 - mvolts) * 12) / 300;
} else if (mvolts > 3300) {
battery_level = 6 - ((3350 - mvolts) * 6) / 340;
} else {
battery_level = 0;
}
printf("battery level: %d \n", battery_level);
return battery_level;
}
/**@brief Function for handling the ADC interrupt.
*
* @details This function will fetch the conversion result from the ADC, convert the value into
* percentage and send it to peer.
*/
void saadc_event_handler(nrf_drv_saadc_evt_t const *p_event) {
printf("saadc event handler \n");
if (p_event->type == NRF_DRV_SAADC_EVT_DONE) {
nrf_saadc_value_t adc_result;
uint16_t batt_lvl_in_milli_volts;
uint16_t actual_batt_lvl;
uint32_t err_code;
adc_result = p_event->data.done.p_buffer[0];
err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, 1);
APP_ERROR_CHECK(err_code);
// Converting millivolt output to actual voltage (270mV diode drop and 1/2 voltage divider)
batt_lvl_in_milli_volts = ADC_RESULT_IN_MILLI_VOLTS(adc_result) * 2.787 / 2;
printf("Batt Level: %d\n", batt_lvl_in_milli_volts);
printf("Batt ADC_RESULT_IN_MILLI_VOLTS: %d\n", ADC_RESULT_IN_MILLI_VOLTS(adc_result));
uint8_t percentage_batt_lvl = battery_percent_calculator(batt_lvl_in_milli_volts);
err_code = ble_bas_battery_level_update(&m_bas, percentage_batt_lvl, BLE_CONN_HANDLE_ALL);
if ((err_code != NRF_SUCCESS) &&
(err_code != NRF_ERROR_INVALID_STATE) &&
(err_code != NRF_ERROR_RESOURCES) &&
(err_code != NRF_ERROR_BUSY) &&
(err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)) {
APP_ERROR_HANDLER(err_code);
printf(nrf_strerror_get(err_code));
}
}
}
/**@brief Function for configuring ADC to do battery level conversion.
*/
static void adc_configure(void) {
nrf_saadc_channel_config_t config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_VDD);
ret_code_t err_code = nrf_drv_saadc_init(NULL, saadc_event_handler);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_channel_init(0, &config);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_buffer_convert(&adc_buf[0], 1);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_buffer_convert(&adc_buf[1], 1);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for performing battery measurement and updating the Battery Level characteristic
* in Battery Service.
static void battery_level_update(void)
{
ret_code_t err_code;
uint8_t battery_level;
battery_level = (uint8_t)sensorsim_measure(&m_battery_sim_state, &m_battery_sim_cfg);
err_code = ble_bas_battery_level_update(&m_bas, battery_level, BLE_CONN_HANDLE_ALL);
if ((err_code != NRF_SUCCESS) &&
(err_code != NRF_ERROR_INVALID_STATE) &&
(err_code != NRF_ERROR_RESOURCES) &&
(err_code != NRF_ERROR_BUSY) &&
(err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
)
{
APP_ERROR_HANDLER(err_code);
}
}
*/
/**@brief Function for handling the Battery measurement timer timeout.
*
* @details This function will be called each time the battery level measurement timer expires.
*
* @param[in] p_context Pointer used for passing some arbitrary information (context) from the
* app_start_timer() call to the timeout handler.
static void battery_level_meas_timeout_handler(void * p_context)
{
UNUSED_PARAMETER(p_context);
battery_level_update();
}
*/
/**@brief Function for the Timer initialization.
*
* @details Initializes the timer module. This creates and starts application timers.
*/
static void timers_init(void)
{
// Initialize timer module.
ret_code_t err_code = app_timer_init();
APP_ERROR_CHECK(err_code);
// Create timers.
err_code = app_timer_create(&m_notification_timer_id, APP_TIMER_MODE_REPEATED, notification_timeout_handler);
APP_ERROR_CHECK(err_code);
err_code = app_timer_create(&m_battery_timer_id,
APP_TIMER_MODE_REPEATED,
adc_configure);
APP_ERROR_CHECK(err_code);
/* YOUR_JOB: Create any timers to be used by the application.
Below is an example of how to create a timer.
For every new timer needed, increase the value of the macro APP_TIMER_MAX_TIMERS by
one.
ret_code_t err_code;
err_code = app_timer_create(&m_app_timer_id, APP_TIMER_MODE_REPEATED, timer_timeout_handler);
APP_ERROR_CHECK(err_code); */
}
/**@brief Function for the GAP initialization. Its like a profile for a service
*
* @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
* device including the device name, appearance, and the preferred connection parameters.
*/
static void gap_params_init(void)
{
ret_code_t err_code;
ble_gap_conn_params_t gap_conn_params;
ble_gap_conn_sec_mode_t sec_mode;
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
err_code = sd_ble_gap_device_name_set(&sec_mode,
(const uint8_t *)DEVICE_NAME,
strlen(DEVICE_NAME));
APP_ERROR_CHECK(err_code);
/* YOUR_JOB: Use an appearance value matching the application's use case.
err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_);
APP_ERROR_CHECK(err_code); */
memset(&gap_conn_params, 0, sizeof(gap_conn_params));
gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
gap_conn_params.slave_latency = SLAVE_LATENCY;
gap_conn_params.conn_sup_timeout = CONN_SUP_TIMEOUT;
err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for initializing the GATT module.
*/
static void gatt_init(void)
{
ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling Queued Write Module errors.
*
* @details A pointer to this function will be passed to each service which may need to inform the
* application about an error.
*
* @param[in] nrf_error Error code containing information about what went wrong.
*/
static void nrf_qwr_error_handler(uint32_t nrf_error)
{
APP_ERROR_HANDLER(nrf_error);
}
/**@brief Function for handling the YYY Service events.
* YOUR_JOB implement a service handler function depending on the event the service you are using can generate
*
* @details This function will be called for all YY Service events which are passed to
* the application.
*
* @param[in] p_yy_service YY Service structure.
* @param[in] p_evt Event received from the YY Service.
*
*
static void on_yys_evt(ble_yy_service_t * p_yy_service,
ble_yy_service_evt_t * p_evt)
{
switch (p_evt->evt_type)
{
case BLE_YY_NAME_EVT_WRITE:
APPL_LOG("[APPL]: charact written with value %s. ", p_evt->params.char_xx.value.p_str);
break;
default:
// No implementation needed.
break;
}
}
*/
/**@brief Function for handling the Custom Service Service events.
*
* @details This function will be called for all Custom Service events which are passed to
* the application.
*
* @param[in] p_cus_service Custom Service structure.
* @param[in] p_evt Event received from the Custom Service.
*
*/
static void on_cus_evt(ble_cus_t * p_cus_service,
ble_cus_evt_t * p_evt)
{
ret_code_t err_code;
switch(p_evt->evt_type)
{
//if notification for this custom service is enabled then we will get notifications accordingly
case BLE_CUS_EVT_NOTIFICATION_ENABLED:
err_code = app_timer_start(m_notification_timer_id, NOTIFICATION_INTERVAL, NULL);
APP_ERROR_CHECK(err_code);
err_code = app_timer_start(m_battery_timer_id, BATTERY_LEVEL_MEAS_INTERVAL, NULL);
APP_ERROR_CHECK(err_code);
break;
//if not stop the notification timer
case BLE_CUS_EVT_NOTIFICATION_DISABLED:
err_code = app_timer_stop(m_notification_timer_id);
APP_ERROR_CHECK(err_code);
break;
case BLE_CUS_EVT_CONNECTED:
break;
case BLE_CUS_EVT_DISCONNECTED:
break;
default:
// No implementation needed.
break;
}
}
/**@brief Function for initializing services that will be used by the application.
*/
static void services_init(void)
{
ret_code_t err_code;
nrf_ble_qwr_init_t qwr_init = {0};
ble_cus_init_t cus_init = {0};
ble_bas_init_t bas_init;
// Initialize Queued Write Module.
qwr_init.error_handler = nrf_qwr_error_handler;
err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
APP_ERROR_CHECK(err_code);
// Initialize CUS Service init structure to zero.
cus_init.evt_handler = on_cus_evt;
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cus_init.custom_value_char_attr_md.cccd_write_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cus_init.custom_value_char_attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&cus_init.custom_value_char_attr_md.write_perm);
err_code = ble_cus_init(&m_cus, &cus_init);
APP_ERROR_CHECK(err_code);
// Initialize Battery Service.
//TODO: Check memset?
memset(&bas_init, 0, sizeof(bas_init));
// Here the sec level for the Battery Service can be changed/increased.
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.cccd_write_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.read_perm);
BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&bas_init.battery_level_char_attr_md.write_perm);
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_report_read_perm);
bas_init.evt_handler = NULL;
bas_init.support_notification = true;
bas_init.p_report_ref = NULL;
bas_init.initial_batt_level = 100;
err_code = ble_bas_init(&m_bas, &bas_init);
APP_ERROR_CHECK(err_code);
/* YOUR_JOB: Add code to initialize the services used by the application.
ble_xxs_init_t xxs_init;
ble_yys_init_t yys_init;
// Initialize XXX Service.
memset(&xxs_init, 0, sizeof(xxs_init));
xxs_init.evt_handler = NULL;
xxs_init.is_xxx_notify_supported = true;
xxs_init.ble_xx_initial_value.level = 100;
err_code = ble_bas_init(&m_xxs, &xxs_init);
APP_ERROR_CHECK(err_code);
// Initialize YYY Service.
memset(&yys_init, 0, sizeof(yys_init));
yys_init.evt_handler = on_yys_evt;
yys_init.ble_yy_initial_value.counter = 0;
err_code = ble_yy_service_init(&yys_init, &yy_init);
APP_ERROR_CHECK(err_code);
*/
}
/**@brief Function for handling the Connection Parameters Module.
*
* @details This function will be called for all events in the Connection Parameters Module which
* are passed to the application.
* @note All this function does is to disconnect. This could have been done by simply
* setting the disconnect_on_fail config parameter, but instead we use the event
* handler mechanism to demonstrate its use.
*
* @param[in] p_evt Event received from the Connection Parameters Module.
*/
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
ret_code_t err_code;
if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
{
err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
APP_ERROR_CHECK(err_code);
}
}
/**@brief Function for handling a Connection Parameters error.
*
* @param[in] nrf_error Error code containing information about what went wrong.
*/
static void conn_params_error_handler(uint32_t nrf_error)
{
APP_ERROR_HANDLER(nrf_error);
}
/**@brief Function for initializing the Connection Parameters module.
*/
static void conn_params_init(void)
{
ret_code_t err_code;
ble_conn_params_init_t cp_init;
memset(&cp_init, 0, sizeof(cp_init));
cp_init.p_conn_params = NULL;
cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
cp_init.next_conn_params_update_delay = NEXT_CONN_PARAMS_UPDATE_DELAY;
cp_init.max_conn_params_update_count = MAX_CONN_PARAMS_UPDATE_COUNT;
cp_init.start_on_notify_cccd_handle = BLE_GATT_HANDLE_INVALID;
cp_init.disconnect_on_fail = false;
cp_init.evt_handler = on_conn_params_evt;
cp_init.error_handler = conn_params_error_handler;
err_code = ble_conn_params_init(&cp_init);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for starting timers. Not used as of now.
*/
static void application_timers_start(void)
{
/* YOUR_JOB: Start your timers. below is an example of how to start a timer.
ret_code_t err_code;
err_code = app_timer_start(m_app_timer_id, TIMER_INTERVAL, NULL);
APP_ERROR_CHECK(err_code); */
/*ret_code_t err_code;
err_code = app_timer_start(m_notification_timer_id, 2000, handling_sensor);
printf(nrf_strerror_get(err_code));
printf("Temperature of the object : %d Celsius degrees.", 1);*/
}
/**@brief Function for handling advertising events.
*
* @details This function will be called for advertising events which are passed to the application.
*
* @param[in] ble_adv_evt Advertising event.
*/
static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
ret_code_t err_code;
switch (ble_adv_evt)
{
case BLE_ADV_EVT_FAST:
NRF_LOG_INFO("Fast advertising.");
err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
APP_ERROR_CHECK(err_code);
break;
case BLE_ADV_EVT_IDLE:
sleep_mode_enter();
break;
default:
break;
}
}
/**@brief Function for handling BLE events.
*
* @param[in] p_ble_evt Bluetooth stack event.
* @param[in] p_context Unused.
*/
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
ret_code_t err_code = NRF_SUCCESS;
switch (p_ble_evt->header.evt_id)
{
case BLE_GAP_EVT_DISCONNECTED:
NRF_LOG_INFO("Disconnected.");
break;
case BLE_GAP_EVT_CONNECTED:
NRF_LOG_INFO("Connected.");
err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
APP_ERROR_CHECK(err_code);
m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle); //? why qwr
APP_ERROR_CHECK(err_code);
break;
case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
{
NRF_LOG_DEBUG("PHY update request.");
ble_gap_phys_t const phys =
{
.rx_phys = BLE_GAP_PHY_AUTO,
.tx_phys = BLE_GAP_PHY_AUTO,
};
err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
APP_ERROR_CHECK(err_code);
} break;
case BLE_GATTC_EVT_TIMEOUT:
// Disconnect on GATT Client timeout event.
NRF_LOG_DEBUG("GATT Client Timeout.");
err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
APP_ERROR_CHECK(err_code);
break;
case BLE_GATTS_EVT_TIMEOUT:
// Disconnect on GATT Server timeout event.
NRF_LOG_DEBUG("GATT Server Timeout.");
err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
APP_ERROR_CHECK(err_code);
break;
default:
// No implementation needed.
break;
}
}
/**@brief Function for initializing the BLE stack.
*
* @details Initializes the SoftDevice and the BLE event interrupt.
*/
static void ble_stack_init(void)
{
ret_code_t err_code;
err_code = nrf_sdh_enable_request(); //check if can request
APP_ERROR_CHECK(err_code);
// Configure the BLE stack using the default settings.
// Fetch the start address of the application RAM.
uint32_t ram_start = 0;
err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
APP_ERROR_CHECK(err_code);
// Enable BLE stack.
err_code = nrf_sdh_ble_enable(&ram_start);
APP_ERROR_CHECK(err_code);
// Register a handler for BLE events.
NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL); //?
}
/**@brief Function for the Peer Manager initialization.
*/
static void peer_manager_init(void)
{
ble_gap_sec_params_t sec_param;
ret_code_t err_code;
err_code = pm_init();
APP_ERROR_CHECK(err_code);
memset(&sec_param, 0, sizeof(ble_gap_sec_params_t));
// Security parameters to be used for all security procedures.
sec_param.bond = SEC_PARAM_BOND;
sec_param.mitm = SEC_PARAM_MITM;
sec_param.lesc = SEC_PARAM_LESC;
sec_param.keypress = SEC_PARAM_KEYPRESS;
sec_param.io_caps = SEC_PARAM_IO_CAPABILITIES;
sec_param.oob = SEC_PARAM_OOB;
sec_param.min_key_size = SEC_PARAM_MIN_KEY_SIZE;
sec_param.max_key_size = SEC_PARAM_MAX_KEY_SIZE;
sec_param.kdist_own.enc = 1;
sec_param.kdist_own.id = 1;
sec_param.kdist_peer.enc = 1;
sec_param.kdist_peer.id = 1;
err_code = pm_sec_params_set(&sec_param);
APP_ERROR_CHECK(err_code);
err_code = pm_register(pm_evt_handler);
APP_ERROR_CHECK(err_code);
}
/**@brief Clear bond information from persistent storage.
*/
static void delete_bonds(void)
{
ret_code_t err_code;
NRF_LOG_INFO("Erase bonds!");
err_code = pm_peers_delete();
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling events from the BSP module.
*
* @param[in] event Event generated when button is pressed.
*/
static void bsp_event_handler(bsp_event_t event)
{
ret_code_t err_code;
switch (event)
{
case BSP_EVENT_SLEEP:
sleep_mode_enter();
break; // BSP_EVENT_SLEEP
case BSP_EVENT_DISCONNECT:
err_code = sd_ble_gap_disconnect(m_conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
if (err_code != NRF_ERROR_INVALID_STATE)
{
APP_ERROR_CHECK(err_code);
}
break; // BSP_EVENT_DISCONNECT
case BSP_EVENT_WHITELIST_OFF:
if (m_conn_handle == BLE_CONN_HANDLE_INVALID)
{
err_code = ble_advertising_restart_without_whitelist(&m_advertising);
if (err_code != NRF_ERROR_INVALID_STATE)
{
APP_ERROR_CHECK(err_code);
}
}
break; // BSP_EVENT_KEY_0
default:
break;
}
}
/**@brief Function for initializing the Advertising functionality.
*/
static void advertising_init(void)
{
ret_code_t err_code;
ble_advertising_init_t init;
memset(&init, 0, sizeof(init));
init.advdata.name_type = BLE_ADVDATA_FULL_NAME;
init.advdata.include_appearance = true;
init.advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
init.advdata.uuids_complete.p_uuids = m_adv_uuids;
init.config.ble_adv_fast_enabled = true;
init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
init.config.ble_adv_fast_timeout = APP_ADV_DURATION;
init.evt_handler = on_adv_evt;
err_code = ble_advertising_init(&m_advertising, &init);
APP_ERROR_CHECK(err_code);
ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}
/**@brief Function for initializing buttons and leds.
*
* @param[out] p_erase_bonds Will be true if the clear bonding button was pressed to wake the application up.
*/
static void buttons_leds_init(bool * p_erase_bonds)
{
ret_code_t err_code;
bsp_event_t startup_event;
err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, bsp_event_handler);
APP_ERROR_CHECK(err_code);
err_code = bsp_btn_ble_init(NULL, &startup_event);
APP_ERROR_CHECK(err_code);
*p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
}
/**@brief Function for initializing the nrf log module.
*/
static void log_init(void)
{
ret_code_t err_code = NRF_LOG_INIT(NULL);
APP_ERROR_CHECK(err_code);
NRF_LOG_DEFAULT_BACKENDS_INIT();
}
/**@brief Function for initializing power management.
*/
static void power_management_init(void)
{
ret_code_t err_code;
err_code = nrf_pwr_mgmt_init();
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling the idle state (main loop).
*
* @details If there is no pending log operation, then sleep until the next event occurs.
*/
static void idle_state_handle(void)
{
if (NRF_LOG_PROCESS() == false)
{
nrf_pwr_mgmt_run();
}
}
/**@brief Function for starting advertising.
*/
static void advertising_start(bool erase_bonds)
{
if (erase_bonds == true)
{
delete_bonds();
// Advertising is started by PM_EVT_PEERS_DELETED_SUCEEDED event
}
else
{
ret_code_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
APP_ERROR_CHECK(err_code);
}
}
/**@brief Function for application main entry.
*/
int main(void)
{
bool erase_bonds;
// Initialize.
log_init();
timers_init();
buttons_leds_init(&erase_bonds);
power_management_init();
ble_stack_init();
gap_params_init();
gatt_init();
services_init();
advertising_init();
conn_params_init();
peer_manager_init();
// Start execution.
NRF_LOG_INFO("Template example started.");
application_timers_start();
twi_init();
mlx90632_init();
advertising_start(erase_bonds);
mlx90632_read_eeprom(&PR, &PG, &PO, &PT, &Ea, &Eb, &Fa, &Fb, &Ga, &Gb, &Ha, &Hb, &Ka);
// Enter main loop.
for (;;)
{
idle_state_handle();
}
}
/**
* @}
*/
I have tried to read on the different posts and understand that there are people who will need to "step down" the voltage if it is too high.
So here is my question: May anyone please tell me what are the steps to achieve my goal? I have no idea where to start. I have also went through ble_app_hrs, saadc peripheral, ble_proximity examples and tried to find a way to make it work but to no avail. My current code looks like this and I am facing fatal error when the program runs into advertising_init().
Note: I am working with a temperature sensor and the battery is wired to the board together with the sensor. The sensor is reading temperatures properly. The wiring is not done by me but is done by my colleagues. Also, I have set the parameter to VDD instead of AINI0 and I am not sure if it is correct.
Please help me. Thank you.
Best Regards,
EeChin
