Current consumption of 3-4 mA while interfacing bme280 sensor

[Newbie]

Hello,

I am using sdk 12.2 and nrf52832 customized boards. I have interfaced bme 280 with nrf52 customized boards. My challenge is I am getting 3-4 mA current when I am calling calibration functions for bme280. 

I am attaching my main.c file as as well as read and write functions for bme280.

Please suggest me how can I reduce current?

// write 1 byte to the i2c register at the given address (see table 11 in the LSM9DS0 spec)
ret_code_t write16(uint8_t reg, uint8_t value)
{
ret_code_t ret_code;
uint8_t data[3];
data[0] = reg;
data[1] = value;

nrf_delay_ms(10);

ret_code = nrf_drv_twi_tx(&m_twi,0x76,data, 2, false);
APP_ERROR_CHECK(ret_code);
nrf_delay_ms(10);

return ret_code;

}

uint8_t read16(uint16_t reg)

{

uint16_t value;
nrf_delay_ms(10);

read_sensor_data(0x76,reg,(uint8_t*)&value, sizeof(value));

nrf_delay_ms(10);

return value;

}

Thanks,

Shailavmain.c

[Keton]

You're not putting CPU to sleep correctly. Read about FPU and TWI power consumption erratas on infocenter.

[Newbie]

Something like this worked for me:

static void power_manage(void)
{

    uint32_t err_code;
    __set_FPSCR(__get_FPSCR()  & ~(FPU_EXCEPTION_MASK));      
    (void) __get_FPSCR();
    NVIC_ClearPendingIRQ(FPU_IRQn);

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

[Keton]

this solves FPU part but not TWI master part. Make sure that TWI peripheral is in uninit state before you go to sleep and then apply TWI errata on top of that.