Hello !!
I have custom board on nrf52832 having 10 buttons which is pull down by default. I have achieved 22uA after modifying the ble_app_beacon example to broadcast when button is pressed.I am also having coin cell with the custom board so i want to check the battery voltage so that i could indicate the battery level (2 conditons i.e <10% & >10% ) using bi-colour led.
I have modified ble_app_beacon as per requirement and then integrated SAADC example with modified ble_app_beacon example. I am now getting more than 2 mA current consumption.
So, If anyone could help me with the code so that I could monitor the battery (on any interval) to indicate battery percentage. I am also attaching the main code so that it would be more understandable. My requirement is 3uA when there is no broadcasting.
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/** @file
*
* @defgroup ble_sdk_app_beacon_main main.c
* @{
* @ingroup ble_sdk_app_beacon
* @brief Beacon Transmitter Sample Application main file.
*
* This file contains the source code for an Beacon transmitter sample application.
*/
#include <stdbool.h>
#include <stdint.h>
#include "nordic_common.h"
#include "bsp.h"
#include "nrf_soc.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "ble_advdata.h"
#include "app_timer.h"
#include "nrf_drv_clock.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_drv_saadc.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"
#include "boards.h"
#include "nrf.h"
#include "nrf_delay.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
/***** Broadcast Parameters *******/
#define DEVICE_NAME "BLE_APP_BEACON"
#define APP_BLE_CONN_CFG_TAG 1 /**< A tag identifying the SoftDevice BLE configuration. */
#define NON_CONNECTABLE_ADV_INTERVAL MSEC_TO_UNITS(400, UNIT_0_625_MS) /**< The advertising interval for non-connectable advertisement (100 ms). This value can vary between 100ms to 10.24s). */
#define APP_ADV_DATA_LENGTH 0x15 /**< Length of manufacturer specific data in the advertisement. */
#define APP_DEVICE_TYPE 0x02 /**< 0x02 refers to Beacon. */
#define APP_COMPANY_IDENTIFIER 0x0059 /**< Company identifier for Nordic Semiconductor ASA. as per www.bluetooth.org. */
#define DEAD_BEEF 0xDEADBEEF /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
#define HIGH 1
#define LOW 0
static ble_gap_adv_params_t m_adv_params; /**< Parameters to be passed to the stack when starting advertising. */
static uint8_t m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET; /**< Advertising handle used to identify an advertising set. */
static uint8_t m_enc_advdata[BLE_GAP_ADV_SET_DATA_SIZE_MAX]; /**< Buffer for storing an encoded advertising set. */
uint16_t remote_led_indication;
static uint8_t packet_buf; /****** TX buffer for buttons ******/
/****** ADC parameters *********/
#define SAMPLES_IN_BUFFER 1
volatile uint8_t state = 1;
static const nrf_drv_timer_t m_timer = NRF_DRV_TIMER_INSTANCE(1);
static nrf_saadc_value_t m_buffer_pool[2][SAMPLES_IN_BUFFER];
static nrf_ppi_channel_t m_ppi_channel;
//static uint32_t m_adc_evt_counter;
#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 ADC_RESULT_IN_MILLI_VOLTS(ADC_VALUE) \
((((ADC_VALUE) *ADC_REF_VOLTAGE_IN_MILLIVOLTS) / ADC_RES_10BIT) * ADC_PRE_SCALING_COMPENSATION)
void timer_handler(nrf_timer_event_t event_type, void * p_context)
{
}
void saadc_sampling_event_init(void)
{
ret_code_t err_code;
err_code = nrf_drv_ppi_init();
APP_ERROR_CHECK(err_code);
nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_cfg.bit_width = NRF_TIMER_BIT_WIDTH_32;
err_code = nrf_drv_timer_init(&m_timer, &timer_cfg, timer_handler);
APP_ERROR_CHECK(err_code);
/* setup m_timer for compare event every 400ms */
uint32_t ticks = nrf_drv_timer_ms_to_ticks(&m_timer, 400);
nrf_drv_timer_extended_compare(&m_timer,
NRF_TIMER_CC_CHANNEL0,
ticks,
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
false);
nrf_drv_timer_enable(&m_timer);
uint32_t timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&m_timer,
NRF_TIMER_CC_CHANNEL0);
uint32_t saadc_sample_task_addr = nrf_drv_saadc_sample_task_get();
/* setup ppi channel so that timer compare event is triggering sample task in SAADC */
err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(m_ppi_channel,
timer_compare_event_addr,
saadc_sample_task_addr);
APP_ERROR_CHECK(err_code);
}
void saadc_sampling_event_enable(void)
{
ret_code_t err_code = nrf_drv_ppi_channel_enable(m_ppi_channel);
APP_ERROR_CHECK(err_code);
}
void saadc_callback(nrf_drv_saadc_evt_t const * p_event)
{
if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
{
ret_code_t err_code;
nrf_saadc_value_t adc_result;
uint16_t batt_lvl_in_milli_volts;
err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);
int i;
//NRF_LOG_INFO("ADC event number: %d", (int)m_adc_evt_counter);
for (i = 0; i < SAMPLES_IN_BUFFER; i++)
{
adc_result=p_event->data.done.p_buffer[0];
batt_lvl_in_milli_volts = ADC_RESULT_IN_MILLI_VOLTS(adc_result);
}
remote_led_indication = batt_lvl_in_milli_volts;
//m_adc_evt_counter++;
}
}
void saadc_init(void)
{
ret_code_t err_code;
nrf_saadc_channel_config_t channel_config =
NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_VDD);
err_code = nrf_drv_saadc_init(NULL, saadc_callback);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_channel_init(0, &channel_config);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[0], SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool[1], SAMPLES_IN_BUFFER);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for the GAP initialization.
*
* @details This function will set up all the necessary GAP (Generic Access Profile) parameters of
* the device. It also sets the permissions and appearance.
*/
static void gap_params_init(void)
{
uint32_t err_code;
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);
}
/**@brief Struct that contains pointers to the encoded advertising data. */
static ble_gap_adv_data_t m_adv_data =
{
.adv_data =
{
.p_data = m_enc_advdata,
.len = BLE_GAP_ADV_SET_DATA_SIZE_MAX
},
.scan_rsp_data =
{
.p_data = NULL,
.len = 0
}
};
/**@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 Function for initializing the Advertising functionality.
*
* @details Encodes the required advertising data and passes it to the stack.
* Also builds a structure to be passed to the stack when starting advertising.
*/
static void advertising_data_update(void)
{
uint32_t err_code;
ble_advdata_t advdata;
uint8_t flags = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;
ble_advdata_manuf_data_t manuf_specific_data;
manuf_specific_data.company_identifier = APP_COMPANY_IDENTIFIER;
manuf_specific_data.data.p_data = (uint8_t *) &packet_buf;
manuf_specific_data.data.size = sizeof(packet_buf);
advdata.p_manuf_specific_data = &manuf_specific_data;
// Build and set advertising data.
memset(&advdata, 0, sizeof(advdata));
//advdata.name_type = BLE_ADVDATA_NO_NAME;
advdata.name_type = BLE_ADVDATA_FULL_NAME;
advdata.flags = flags;
advdata.p_manuf_specific_data = &manuf_specific_data;
// Initialize advertising parameters (used when starting advertising).
memset(&m_adv_params, 0, sizeof(m_adv_params));
m_adv_params.properties.type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_NONSCANNABLE_UNDIRECTED;
m_adv_params.p_peer_addr = NULL; // Undirected advertisement.
m_adv_params.filter_policy = BLE_GAP_ADV_FP_ANY;
m_adv_params.interval = NON_CONNECTABLE_ADV_INTERVAL;
m_adv_params.duration = 400; // Broadcast for 4 sec.
err_code = ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
APP_ERROR_CHECK(err_code);
err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &m_adv_params);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for starting advertising.
*/
static void advertising_start(void)
{
ret_code_t err_code;
err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
APP_ERROR_CHECK(err_code);
/**** LED indication while advertising ****/
if (remote_led_indication > ("%d", 1920)){
nrf_gpio_pin_write(LED_1, LOW); // Green Led will Blink on less than 10% battery
nrf_delay_ms(50);
nrf_gpio_pin_write(LED_1, HIGH);
nrf_delay_ms(50);
}
if (remote_led_indication < ("%d", 1920)){
nrf_gpio_pin_write(LED_2, LOW); // Red Led will Blink on more than 10% battery
nrf_delay_ms(50);
nrf_gpio_pin_write(LED_2, HIGH);
nrf_delay_ms(50);
}
//err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
//APP_ERROR_CHECK(err_code);
}
/**@brief Function for starting advertising.
*/
static void advertising_stop()
{
ret_code_t err_code;
err_code = sd_ble_gap_adv_stop(m_adv_handle);
APP_ERROR_CHECK(err_code);
}
/**@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();
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);
}
/**@brief Function for initializing logging. */
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 LEDs. */
static void leds_init(void)
{
ret_code_t err_code = bsp_init(BSP_INIT_LEDS, NULL);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for initializing timers. */
static void timers_init(void)
{
ret_code_t err_code = app_timer_init();
APP_ERROR_CHECK(err_code);
}
/**@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 next the next event occurs.
*/
static void idle_state_handle(void)
{
if (NRF_LOG_PROCESS() == false)
{
nrf_pwr_mgmt_run();
}
}
/**@brief Function for handling bsp events.
*/
void bsp_evt_handler(bsp_event_t evt)
{
switch (evt)
{
case BSP_EVENT_KEY_0:
packet_buf = BSP_EVENT_KEY_0;
break;
case BSP_EVENT_KEY_1:
packet_buf = BSP_EVENT_KEY_1;
break;
case BSP_EVENT_KEY_2:
packet_buf = BSP_EVENT_KEY_2;
break;
case BSP_EVENT_KEY_3:
packet_buf = BSP_EVENT_KEY_3;
break;
case BSP_EVENT_KEY_4:
packet_buf = BSP_EVENT_KEY_4;
break;
case BSP_EVENT_KEY_5:
packet_buf = BSP_EVENT_KEY_5;
break;
case BSP_EVENT_KEY_6:
packet_buf = BSP_EVENT_KEY_6;
break;
case BSP_EVENT_KEY_7:
packet_buf = BSP_EVENT_KEY_7;
break;
case BSP_EVENT_KEY_8:
packet_buf = BSP_EVENT_KEY_8;
break;
case BSP_EVENT_KEY_9:
packet_buf = BSP_EVENT_KEY_9;
break;
case BSP_EVENT_KEY_10:
packet_buf = BSP_EVENT_KEY_10;
break;
}
NRF_LOG_INFO("%u", packet_buf);
(void)sd_ble_gap_adv_stop(m_adv_handle);
advertising_data_update();
advertising_start();
}
/**
* @brief Function for application main entry.
*/
int main(void)
{
NRF_POWER->DCDCEN = 1;
uint32_t err_code = NRF_SUCCESS;
// Initialize.
nrf_pwr_mgmt_init();
//log_init();
timers_init();
//leds_init();
//power_management_init();
ble_stack_init();
gap_params_init();
//advertising_init();
advertising_data_update();
err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, bsp_evt_handler);
APP_ERROR_CHECK(err_code);
saadc_init();
saadc_sampling_event_init();
saadc_sampling_event_enable();
// Start execution.
NRF_LOG_INFO("Beacon example started.");
advertising_start();
// Enter main loop.
for(;;)
{
idle_state_handle();
}
}
/**
* @}
*/
I would appreciate any help!!!
Thanks!!!
