Lower power in sleep of GPIO as outputs?

RE: Lower power in sleep of GPIO as outputs?

angel — Mon, 27 Mar 2017 07:16:31 GMT

I found out the problem: I was configuring the input pins as high accuracy (which I certainly do not need). I fixed it changing this line:

nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(true);

nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(false);

RE: Lower power in sleep of GPIO as outputs?

angel — Fri, 24 Mar 2017 17:22:53 GMT

I have tried this:

nrf_gpio_cfg_input(LED_UP, NRF_GPIO_PIN_NOPULL);
nrf_gpio_cfg_input(LED_DOWN, NRF_GPIO_PIN_NOPULL);
nrf_gpio_cfg_input(LED_LEFT, NRF_GPIO_PIN_NOPULL);
nrf_gpio_cfg_input(LED_RIGHT, NRF_GPIO_PIN_NOPULL);

nrf_gpio_input_disconnect(LED_UP);
nrf_gpio_input_disconnect(LED_DOWN);
nrf_gpio_input_disconnect(LED_LEFT);
nrf_gpio_input_disconnect(LED_RIGHT);

Didnt make any difference...

I also have changed the function timer stop from:

void timer2_stop()
{
    NRF_TIMER2->TASKS_STOP = 1;
}

to:

void timer2_stop()
{
    NRF_TIMER2->TASKS_SHUTDOWN = 1;
    NRF_TIMER2->TASKS_STOP = 1;
}

but it made no difference :(

RE: Lower power in sleep of GPIO as outputs?

angel — Fri, 24 Mar 2017 07:51:07 GMT

Hi Stian,

This is what I have been testing and I still get current consumption of 1 mA

void do_to_sleeping(instance_data_t* data)
{
    timer2_stop();
    close_channel(&channel_0);
    nrf_gpio_cfg_default(LED_UP);
    nrf_gpio_cfg_default(LED_DOWN);
    nrf_gpio_cfg_default(LED_LEFT);
    nrf_gpio_cfg_default(LED_RIGHT);

    nrf_gpio_pin_clear(LED_UP);
    nrf_gpio_pin_clear(LED_DOWN);
    nrf_gpio_pin_clear(LED_LEFT);
    nrf_gpio_pin_clear(LED_RIGHT);
}

This nrf_gpio_cfg_default() function is supposed to do what you told me, but I still get high power consumption.

Should I set as input and disconnect in another way?

Thanks!

RE: Lower power in sleep of GPIO as outputs?

Stian Røed Hafskjold — Wed, 22 Mar 2017 10:40:47 GMT

Hi,

You should configure the GPIO's as input and disconnect the input buffer before going to sleep, this way the pins will be floating and no current will go through them.