TWI Low power mode

[Murugan]

Dear Nordic Team,

Thanks for support

Currently i am work with VL53L0X in ble_uart_app example. it working fine , but its take 5ma current. How can i use TWI in low power mode. Please suggest anyone.

SDK =12.3.0 , SD=s132. 

My Code :  

Fullscreen TWI.txt Download

void twi_init (void)
{
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_config = {
       .scl                = DEVICE_SCL_PIN,
       .sda                = DEVICE_SDA_PIN,
       .frequency          = NRF_TWI_FREQ_400K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);  //twi_handler
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);
}


int main(void)
{
    uint32_t err_code;
    bool erase_bonds;
     uint8_t LI8u_Buffer[50]={0};
		static uint8_t data_array[20]={"Distance===>0000MM\n"};
    // Initialize.
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
    //uart_init();
	   //==============================================================
	
//			twi_init();
//			if(VL53L0X_init(1)){VL53L0X_Init_flag=1;}
//			else VL53L0X_Init_flag = 0;	

//			VL53L0X_setSignalRateLimit(0.1);
//			VL53L0X_setVcselPulsePeriod(VcselPeriodPreRange,18);
//			VL53L0X_setVcselPulsePeriod(VcselPeriodFinalRange,14);
//			VL53L0X_setMeasurementTimingBudget(220000);
			
			//============================================================
    buttons_leds_init(&erase_bonds);
    ble_stack_init();
    gap_params_init();
    services_init();
    advertising_init();
    conn_params_init();

   // printf("\r\nUART Start!\r\n");
    err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
    APP_ERROR_CHECK(err_code);

    // Enter main loop.
    for (;;)
    {
			 // nrf_delay_ms(5000);
        power_manage();
			  if(m_conn_handle != BLE_CONN_HANDLE_INVALID)
				{	
					Read_Sensor();
						data_array[12]='0'+(Distance/1000);
						data_array[13]='0'+(Distance/100)%10;
						data_array[14]='0'+(Distance/10)%10;
						data_array[15]='0'+(Distance%10);
					if(VL53L0X_Init_flag){
					err_code=ble_nus_string_send(&m_nus,(uint8_t *)"INIT OK",7);			
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
							}
					  err_code=ble_nus_string_send(&m_nus,data_array,sizeof(data_array));			
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
									nrf_delay_ms(500);
				}					
    }
}
void Read_Sensor(void){
				twi_init();nrf_delay_ms(5);
			if(VL53L0X_init(1)){VL53L0X_Init_flag=1;}
			else VL53L0X_Init_flag = 0;	nrf_delay_ms(5);
//VL53L0X_Init_flag=1;
			VL53L0X_setSignalRateLimit(0.1);
			VL53L0X_setVcselPulsePeriod(VcselPeriodPreRange,18);
			VL53L0X_setVcselPulsePeriod(VcselPeriodFinalRange,14);
			VL53L0X_setMeasurementTimingBudget(220000);
	nrf_delay_ms(500);
						 Distance = VL53L0X_readRangeSingleMillimeters();
						 if( Distance<=2000 && Distance>0 )
						 {	
							 Dist_Values=Distance;
						//	 printf("Distance=%d\r\n",Dist_Values);
						 }else{
							 if(Distance!=0&&Distance!=65535){
								    if(Distance>=2000 &&Distance <=8000){
											Dist_Values=1999;
										}
										else if(Distance>=8000 && Distance <=9000){
											Dist_Values=1999;
										}
							 }
					//		printf("Distance Error=%d\r\n",Distance);
						 }
						 						 	nrf_drv_twi_disable(&m_twi);	nrf_delay_ms(5);
							nrf_drv_twi_uninit(&m_twi);nrf_delay_ms(5);
	
	*(volatile uint32_t *)0x40003FFC = 0;
	*(volatile uint32_t *)0x40003FFC;
	*(volatile uint32_t *)0x40003FFC = 1;
						 
}

[Murugan]

 Problem solved. I am just add few lines in  power manage function  "static void power_manage(void) " . Anyway thank you @haakonsh.

 static void power_manage(void)
{
#if (__FPU_USED == 1)
__set_FPSCR(__get_FPSCR() & ~(0x0000009F));
(void) __get_FPSCR();
NVIC_ClearPendingIRQ(FPU_IRQn);
#endif
__WFE();

uint32_t err_code = sd_app_evt_wait();
APP_ERROR_CHECK(err_code);
}