nrf_delay_ms clock issues

[Taylor]

I'm using nrf_delay_ms in main on "ble_app_beacon", but the delay time is much longer than I set.

I have set 2000ms delay to log, but it seems 4s or longer than I set.

int main(void)
{
	uint32_t num=0;
    // Initialize.
    log_init();
    timers_init();
    leds_init();
    power_management_init();
    ble_stack_init();
    advertising_init();

    // Start execution.
    NRF_LOG_INFO("Beacon example started.");
		NRF_LOG_FLUSH();
    advertising_start();

    // Enter main loop.
    for (;; )
    {
			nrf_delay_ms(2000);
			NRF_LOG_INFO("beacon test %d",num);
			NRF_LOG_FLUSH();
			num++;
        idle_state_handle();
    }
}

[Vidar Berg]

Hello,

I see you tagged the question with 'nRF52810', does that mean you are you running this code on an actual nRF52810 SoC? In that case, please make sure you don't have the NRFX_COREDEP_DELAY_US_LOOP_CYCLES flag defined in your project settings (see Transferring the project to nRF52810 hardware for details). This flag is used by the nrf_delay implementation to determine how many NOP instructions it needs to run for a given delay.

[Taylor]

Hi Vidar,

I have tested after deleted the NRFX_COREDEP_DELAY_US_LOOP_CYCLES  and DEVELOP_IN_NRF52832, the clock seems worked normally, but there is another problem.

In my code, LED will change the status for every 2 seconds, but the LED just changed two times and then never change.

int main(void)
{
	  uint8_t  rcv = 0;
		const char * txbuff = "AnyTek";
		uint8_t rcvbuff[ 32 ] = { 0 };
    // Initialize.
		log_init();
    timers_init();
//    leds_init();
    power_management_init();
    ble_stack_init();
    advertising_init();

    // Start execution.
    NRF_LOG_INFO("Beacon example started.");
		NRF_LOG_FLUSH();
    advertising_start();
		platform_gpio_initialize();
		platform_gpio_int_initialize();
		twi_master_init();
		m_sensor_work_init();
//		m_CC1101_Init(0xAA);
//		CC1101_Init();
//		NRF_LOG_FLUSH();
    // Enter main loop.
    for (;; )
    {
//			if(GSENSOR_Get_Transient_Detection_Flag() == true)
//			{
//				nrf_gpio_pin_toggle(GREEN_PIN);
//				nrf_delay_ms(200);
//			}
//			NRF_LOG_INFO("Test");
//					CC1101_Tx_Packet((uint8_t *)txbuff,6,ADDRESS_CHECK);
//			NRF_LOG_FLUSH();
//			CC1101_Tx_Packet((uint8_t *)txbuff,6,ADDRESS_CHECK);
//				CC1101_Clear_RxBuffer( );
//				CC1101_Set_Mode( RX_MODE );
//				rcv = CC1101_Rx_Packet( rcvbuff );
				nrf_delay_ms(2000);
				nrf_gpio_pin_toggle(GREEN_PIN);
//			NRF_LOG_FLUSH();
      idle_state_handle();
    }
}

[Vidar Berg]

Hi,

It mainly depends on the advertising interval, supply voltage, and whether you use the DCDC regulator or not. You can use our online power profiler (https://devzone.nordicsemi.com/nordic/power/w/opp/2/online-power-profiler-for-bluetooth-le) to estimate the average for your configuration.

[Taylor]

Hi,

I used your example of SADDC, but the voltage is 810mV.

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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_pwr_mgmt.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

#include "nrf_delay.h"
#include "twi_master.h"
#include "platform.h"
#include "sensor_i2c.h" 
#include "CC1101.h"
#include "nrf_drv_saadc.h"

#define APP_BLE_CONN_CFG_TAG            1                                  /**< A tag identifying the SoftDevice BLE configuration. */

#define BATTERY_LEVEL_MEAS_INTERVAL     APP_TIMER_TICKS(5000)              /**< Battery level measurement interval (ticks). */

#define NON_CONNECTABLE_ADV_INTERVAL    MSEC_TO_UNITS(100, UNIT_0_625_MS)  /**< The advertising interval for non-connectable advertisement (100 ms). This value can vary between 100ms to 10.24s). */
#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  0                               /**< Typical forward voltage drop of the diode . */
#define ADC_RES_10BIT                   1024                              /**< Maximum digital value for 10-bit ADC conversion. */

/**@brief Macro to convert the result of ADC conversion in millivolts.
 *
 * @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 APP_BEACON_INFO_LENGTH          0x17                               /**< Total length of information advertised by the Beacon. */
#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_MEASURED_RSSI               0xC3                               /**< The Beacon's measured RSSI at 1 meter distance in dBm. */
#define APP_COMPANY_IDENTIFIER          0x0059                             /**< Company identifier for Nordic Semiconductor ASA. as per www.bluetooth.org. */
#define APP_MAJOR_VALUE                 0x01, 0x02                         /**< Major value used to identify Beacons. */
#define APP_MINOR_VALUE                 0x03, 0x04                         /**< Minor value used to identify Beacons. */
#define APP_BEACON_UUID                 0x01, 0x12, 0x23, 0x34, \
                                        0x45, 0x56, 0x67, 0x78, \
                                        0x89, 0x9a, 0xab, 0xbc, \
                                        0xcd, 0xde, 0xef, 0xf0            /**< Proprietary UUID for Beacon. */

#define DEAD_BEEF                       0xDEADBEEF                         /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */

#if defined(USE_UICR_FOR_MAJ_MIN_VALUES)
#define MAJ_VAL_OFFSET_IN_BEACON_INFO   18                                 /**< Position of the MSB of the Major Value in m_beacon_info array. */
#define UICR_ADDRESS                    0x10001080                         /**< Address of the UICR register used by this example. The major and minor versions to be encoded into the advertising data will be picked up from this location. */
#endif

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. */

static nrf_saadc_value_t m_adc_buf;
APP_TIMER_DEF(m_battery_timer_id);

/**@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

    }
};


static uint8_t m_beacon_info[APP_BEACON_INFO_LENGTH] =                    /**< Information advertised by the Beacon. */
{
    APP_DEVICE_TYPE,     // Manufacturer specific information. Specifies the device type in this
                         // implementation.
    APP_ADV_DATA_LENGTH, // Manufacturer specific information. Specifies the length of the
                         // manufacturer specific data in this implementation.
    APP_BEACON_UUID,     // 128 bit UUID value.
    APP_MAJOR_VALUE,     // Major arbitrary value that can be used to distinguish between Beacons.
    APP_MINOR_VALUE,     // Minor arbitrary value that can be used to distinguish between Beacons.
    APP_MEASURED_RSSI    // Manufacturer specific information. The Beacon's measured TX power in
                         // this implementation.
};


/**@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 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)
{
    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
    {
        nrf_saadc_value_t adc_result;
        uint16_t batt_lvl_in_milli_volts;
        uint8_t percentage_batt_lvl;
        uint32_t err_code;

        adc_result = p_event->data.done.p_buffer[0];

        batt_lvl_in_milli_volts =
            ADC_RESULT_IN_MILLI_VOLTS(adc_result) + DIODE_FWD_VOLT_DROP_MILLIVOLTS;

        NRF_LOG_INFO("Battery Level : %d [mV]", batt_lvl_in_milli_volts);
    }
    else if (p_event->type == NRF_DRV_SAADC_EVT_CALIBRATEDONE)
    {
        NRF_LOG_INFO("SAADC calibration complete");
    }
}


/**@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);
    
    ret_code_t err_code = nrf_drv_saadc_buffer_convert(&m_adc_buf, 1);
    APP_ERROR_CHECK(err_code);
    
    err_code = nrf_drv_saadc_sample();
    APP_ERROR_CHECK(err_code);
}


/**@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_init(void)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
    uint8_t       flags = BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED;

    ble_advdata_manuf_data_t manuf_specific_data;

    manuf_specific_data.company_identifier = APP_COMPANY_IDENTIFIER;

#if defined(USE_UICR_FOR_MAJ_MIN_VALUES)
    // If USE_UICR_FOR_MAJ_MIN_VALUES is defined, the major and minor values will be read from the
    // UICR instead of using the default values. The major and minor values obtained from the UICR
    // are encoded into advertising data in big endian order (MSB First).
    // To set the UICR used by this example to a desired value, write to the address 0x10001080
    // using the nrfjprog tool. The command to be used is as follows.
    // nrfjprog --snr <Segger-chip-Serial-Number> --memwr 0x10001080 --val <your major/minor value>
    // For example, for a major value and minor value of 0xabcd and 0x0102 respectively, the
    // the following command should be used.
    // nrfjprog --snr <Segger-chip-Serial-Number> --memwr 0x10001080 --val 0xabcd0102
    uint16_t major_value = ((*(uint32_t *)UICR_ADDRESS) & 0xFFFF0000) >> 16;
    uint16_t minor_value = ((*(uint32_t *)UICR_ADDRESS) & 0x0000FFFF);

    uint8_t index = MAJ_VAL_OFFSET_IN_BEACON_INFO;

    m_beacon_info[index++] = MSB_16(major_value);
    m_beacon_info[index++] = LSB_16(major_value);

    m_beacon_info[index++] = MSB_16(minor_value);
    m_beacon_info[index++] = LSB_16(minor_value);
#endif

    manuf_specific_data.data.p_data = (uint8_t *) m_beacon_info;
    manuf_specific_data.data.size   = APP_BEACON_INFO_LENGTH;

    // Build and set advertising data.
    memset(&advdata, 0, sizeof(advdata));

    advdata.name_type             = BLE_ADVDATA_NO_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        = 0;       // Never time out.

    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);

    err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
    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();
    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);
}


/**@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);
	
	    // Create timers.
    err_code = app_timer_create(&m_battery_timer_id,
                                APP_TIMER_MODE_REPEATED,
                                battery_level_meas_timeout_handler);
    APP_ERROR_CHECK(err_code);
}
/**@brief Function for starting application timers.
 */
static void application_timers_start(void)
{
    ret_code_t err_code;

    // Start application timers.
    err_code = app_timer_start(m_battery_timer_id, BATTERY_LEVEL_MEAS_INTERVAL, NULL);
    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 configuring ADC to do battery level conversion.
 */
static void adc_configure(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);

    config.burst = NRF_SAADC_BURST_ENABLED;

    err_code = nrf_drv_saadc_channel_init(0, &config);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_calibrate_offset();
    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 application main entry.
 */
uint8_t sendbuff[4]={0x0A,0x0B,0x0C,0x0D};
int main(void)
{
    // Initialize.
		log_init();
    timers_init();
//    leds_init();
    power_management_init();
    ble_stack_init();
		sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);
    advertising_init();
		adc_configure();
    // Start execution.
    NRF_LOG_INFO("Beacon example started.");
		application_timers_start();
//		NRF_LOG_FLUSH();
    advertising_start();
		platform_gpio_initialize();
		platform_gpio_int_initialize();
		twi_master_init();
		m_sensor_work_init();
//		m_CC1101_Init(0x00);
//		CC1101_WriteReg(CC1101_REG_PATABLE0,0x00);
//		CC1101_Command(CC1101_CMD_SIDLE);   //退出当前模式
//		CC1101_Command(CC1101_CMD_SRX);     //进入接收模式
    // Enter main loop.
    for (;; )
    {
			if(GSENSOR_Get_Transient_Detection_Flag() == true)
			{
//				nrf_gpio_pin_toggle(GREEN_PIN);
				
//				CC1101_WriteReg(CC1101_REG_PATABLE0,0xc0);//开启天线增益
//				CC1101_RfDataSend(sendbuff,4);
//				CC1101_WriteReg(CC1101_REG_PATABLE0,0);	//关闭天线增益
//				CC1101_Command(CC1101_CMD_SIDLE);   	//退出当前模式
//				CC1101_Command(CC1101_CMD_SRX);     	//进入接收模式
				
//				nrf_delay_ms(200);
//				NRF_LOG_INFO("Test");
			}
//			NRF_LOG_INFO("Test");
//					CC1101_Tx_Packet((uint8_t *)txbuff,6,ADDRESS_CHECK);
//			NRF_LOG_FLUSH();
//			CC1101_Tx_Packet((uint8_t *)txbuff,6,ADDRESS_CHECK);
//				CC1101_Clear_RxBuffer( );
//				CC1101_Set_Mode( RX_MODE );
//				rcv = CC1101_Rx_Packet( rcvbuff );
//				nrf_delay_ms(2000);
//				nrf_gpio_pin_toggle(GREEN_PIN);
//			NRF_LOG_FLUSH();
      idle_state_handle();
    }
}


/**
 * @}
 */

[Taylor]

Oh,

I found the error. In SDK_CONFIG thr resulotion is 8-bit,but is 10-bit in application.

BTW， I want to know could I use the TWI_SW_MASTER which is deprecated to control sensor ?

[Vidar Berg]

Why don't you want HW driver instead (TWI master) ?

[Taylor]

Hi,

I have a question of HW driver(TWI master)

nrf_drv_twi_rx(&m_twi, LM75B_ADDR, &m_sample, sizeof(m_sample))

And there is only one address which is device address, but I want to read the value of some registers, what should I do?

[Vidar Berg]

Hi,

Unless you are using a "preset pointer", you need to issue a write command to the sensor first telling it what you want to read. nrf_drv_twi_rx() will just set up the TWIM in receive mode and wait until the sensor replies back.

I found these from the datasheet:

https://www.nxp.com/docs/en/data-sheet/LM75B.pdf

You can use the NRF_DRV_TWI_XFER_TXRX (see Repeated transfers) helper macro to set up a complete TWI TX RX transaction.

[Taylor]

Thanks！I have read register value successful.

Vidar Berg said:

Why don't you want HW driver instead (TWI master) ?

I'm sorry for forgetting reply you.In our application, we need both of twi and spi peripherals.

Could I use HW driver(TWI master and SPIM master) at the same time in nRF52810?

Both TWI or SPIM HW driver would occur more current?

[Vidar Berg]

Excellent! Yes, you can use TWIM0 and SPIM0 at the same time as they do not share the same peripheral ID:

Instantiation Peripherals with shared ID

[Taylor]

Thanks！

I have another question about HW driver(SPIM).

For example, I want to send register address to recieve some data.

APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, &addr_burst, 1, pReadBuff, ReadSize))

I thought the 'pReadBuff' is correct,but pReadBuff[0] is 0x00 and the data starting from pReadBuff[1] will be wanted data.

So I have to modify like this.

APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, &addr_burst, 1, pReadBuff-1, ReadSize+1))

[Vidar Berg]

Hi,

Do you have a logic analyzer or oscilloscope you can use to prope the bus lines? I'm wondering if the slave is returning 0x00 on the first read?

Taylor said:

pReadBuff-1

I would not recommend this. It will cause the SPIM to write outside of the pReadBuff buffer.