low power saadc

[yangshuanghua]

when I start ADC the current will be HIGH .even I UN-Initialization it .

what I have done like that below；

 

#define SAADC_CONFIG_LP_MODE 1

void my_adc_init(void)							
{
		MI_LOG_DEBUG("my_adc_init\r\n");
    ret_code_t err_code;
    err_code = nrf_drv_saadc_init(NULL, saadc_callback);
    APP_ERROR_CHECK(err_code);
	
    nrf_saadc_channel_config_t channel_config0 =
    NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(LIGHT_CHECK);
	channel_config0.reference=NRF_SAADC_REFERENCE_VDD4;
	
    err_code = nrf_drv_saadc_channel_init(LIGHT_CHECK-1, &channel_config0);
    APP_ERROR_CHECK(err_code);
    
	nrf_saadc_channel_config_t channel_config1 =
    NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(BATTRY_CHECK);
    
    err_code = nrf_drv_saadc_channel_init(BATTRY_CHECK-1, &channel_config1);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool,SAMPLES_IN_BUFFER);
    APP_ERROR_CHECK(err_code);
}

void start_ADC(void)
{
	MI_LOG_DEBUG("start_ADC\r\n");
	uint32_t err_code;
	LIGHT_PIN_control(LIGHT_CONTRL_ACTIVE);
	my_adc_init();
	err_code=nrf_drv_saadc_sample();//
	APP_ERROR_CHECK(err_code);
}
void saadc_callback(nrf_drv_saadc_evt_t const * p_event)										
{
    MI_LOG_DEBUG("saadc_callback\r\n");
	static uint32_t count=0;
    ret_code_t err_code;	
	count ++ ;
    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)//ADC转换完成
    {
    	MI_LOG_INFO("the BATTRY  value is  %d . %d V\r\n", battry_V,(battry_V-(unsigned char )battry_V)*100);
		nrf_drv_saadc_uninit();		
	}
	if(p_event->type == NRF_DRV_SAADC_EVT_LIMIT)
	{
		MI_LOG_INFO("ADC  NRF_DRV_SAADC_EVT_LIMIT %d \r\n",count);
	}
	if(p_event->type == NRF_DRV_SAADC_EVT_CALIBRATEDONE)
	{
		MI_LOG_INFO("ADC  NRF_DRV_SAADC_EVT_CALIBRATEDONE %d \r\n",count);
	}
}

before I started it  The current is 0.6ma

but when I start it the current becom 7ma  .

Is there anything else should I do .

IS there any one can help me .

[haakonsh]

I'm guessing you're not using the DCDC regulator and not putting the CPU to sleep after starting the SAADC. Do you mind posting the relevant code to your SAADC usage?

[yangshuanghua]

I‘ve tried open dcdc .it downs to 3.75ma

but what make me puzzled is that      :start the SAADC or not ,the current could chang so much .

start :3.75ma

no start :0.7ma

 I start SAADC  and then it finsh check    I UN-Initialized the SAADC but it always be high current .

I give my main fuction below

int main(void)
{
    uint32_t err_code;
    ble_stack_init();
	power_first();			
    gap_params_init();
    my_service_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);
	My_flash_init();
	get_save_and_synchronous_num();	
    // Enter main loop.
    for (;;)
    {
		if (NRF_LOG_PROCESS() == false)
		{
			if(My_Time_Fuction_Enable==1)// changes pro min
			{
				My_Time_Fuction_Process();
				My_Time_Fuction_Enable=0;
			}
        power_manage();
		}
    }
}
//most time it wait event until one minite.



void saadc_callback(nrf_drv_saadc_evt_t const * p_event)
{
...
    nrf_drv_saadc_uninit();	
...
}


//stars pro min
void start_ADC(void)
{
	MI_LOG_DEBUG("start_ADC\r\n");
	uint32_t err_code;
	LIGHT_PIN_control(LIGHT_CONTRL_ACTIVE);
	my_adc_init();
	err_code=nrf_drv_saadc_sample();//
	APP_ERROR_CHECK(err_code);
}
// if I Shielded this code   the current would be 0.7ma .
// or it will be 3.75ma

SAADC starts pro minite .and after it finished I  UN-Initialized the SAADC.