RE: Wake UP from deepsleep through SPI

Kenneth — Wed, 10 Jun 2020 11:31:10 GMT

Deep sleep is achieved by calling NRF_POWER->NRF_SYSTEMOFF = 1; (or if the softdevice is enabled use sd_power_system_off()). The result is the same.

Before going to sleep you should setup wakeup on CSN pin, such that when you wakeup (start of main() when using system OFF) you can check if the pin is low, and immediately enable SPIS.

Best regards,
Kenneth

RE: Wake UP from deepsleep through SPI

Justin — Wed, 10 Jun 2020 04:47:35 GMT

To deepsleep I am using this function call.

void deepsleep(void)

{

disable();

spis0->enable = 0;

power->ram0_powerclr = (1 << 17) | (1 << 16);

power->ram1_powerclr = (1 << 17) | (1 << 16);

power->ram2_powerclr = (1 << 17) | (1 << 16);

power->ram3_powerclr = (1 << 17) | (1 << 16);

power->ram4_powerclr = (1 << 17) | (1 << 16);

power->ram5_powerclr = (1 << 17) | (1 << 16);

power->ram6_powerclr = (1 << 17) | (1 << 16);

power->ram7_powerclr = (1 << 17) | (1 << 16);

power->systemoff = 1;

while (1)

{

__asm("wfe");

}

Is this the right way to deepsleep and make sure the power consumption is minimal? Please let me know if there are any other option nordic provides that could consume less current than the one above.