TWI High Idle Current PAN 89

[Dave_couling]

Hi guys, I'm trying to nail down this TWI issue. PAN 89 is related to TWI being used in conjunction with the GPIOTE module. However I manually wrote my own application level code to interface to the nrf_drv_twi code. So I'm not 100% sure it applies to my situation. I do use GPIOTE in a separate freeRTOS thread for interrupt sensing. Also if I comment out that GPIOTE code, there isn't a hugh effect on my idle current. Also tested with and without TWI EasyDMA.

After I place my MPU9250 in low power wake up mode, the device idles at ~600uA.

I've added the suggested code in PAN 89 and I uninit the TWI Sensor Comms when in low power. However this added code seems to have no effect. I use TWI1

void disable_sensor_comms()
{
	nrf_drv_twi_uninit( &m_twi );
	*(volatile uint32_t *)0x40004FFC = 0;
	*(volatile uint32_t *)0x40004FFC;
	*(volatile uint32_t *)0x40004FFC = 1;
}

[MartinBL]

Do you also use timers and/or SPI? The PAN is actually not limited to TWI and GPIOTE only, as I mentioned here the other day.