How to use low-power UART demos other than lpuart

[666]

Hi all,

  I want to use UART periodically, but because I need to communicate with other standard UART, I cannot use LPUART

I saw that Zephyr's demos all use CONF_SERIAL=y, which has an impact on power consumption

I saw the demo of tx_rx_non-blocking, but there is no option for nrf54l15. I'm not sure if it can be used.

Do you have any simple low-power demos?

[Simonr]

Hi

I recommend that you suspend the UART peripheral when it isn't used as that will decrease the current consumption a lot.

Set the following configs =y in your prj.conf file:

CONFIG_PM_DEVICE=y and CONFIG_UART_ASYNC_API=y and add the following to your project to make the application suspend the UART when not in use:

#include <zephyr/pm/device.h>
static const struct device* uart_dev = DEVICE_DT_GET(DT_CHOSEN(zephyr_console));
err = pm_device_action_run(uart_dev, PM_DEVICE_ACTION_SUSPEND);

Best regards,

Simon

[666]

HI Simon

    On the basis of the above, the power consumption has returned to normal, around 3uA. At this point, I set the RX pin to interrupt and wait for the interrupt to trigger the wake-up UART. However, the power consumption has reached around 16uA, which seems a bit high. Do you have any suggestions to reduce the power consumption？

static void pin_irq(nrfx_gpiote_pin_t     pin,

                              nrfx_gpiote_trigger_t trigger,

                              void *                p_context)

{

 

    nrfx_gpiote_trigger_disable(&gpiote, 37);

    const struct device *uart = DEVICE_DT_GET(DT_NODELABEL(uart20));

    async(uart); //wake-up UART

}

int main()

{

 const struct device *uart = DEVICE_DT_GET(DT_NODELABEL(uart20));

    pm_device_action_run(uart, PM_DEVICE_ACTION_SUSPEND);  //3uA

    #if defined(__ZEPHYR__)

    IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_GPIOTE_INST_GET(20)), IRQ_PRIO_LOWEST,

                NRFX_GPIOTE_INST_HANDLER_GET(20), 0, 0);

#endif

    nrfx_gpiote_init(&gpiote, NRFX_GPIOTE_DEFAULT_CONFIG_IRQ_PRIORITY);

     nrfx_gpiote_channel_alloc(&gpiote, &in_channel);

   

    static const nrf_gpio_pin_pull_t pull_config = NRF_GPIO_PIN_PULLUP;

    nrfx_gpiote_trigger_config_t trigger_config = {

        .trigger = NRFX_GPIOTE_TRIGGER_TOGGLE,

        .p_in_channel = &in_channel,

    };

    static const nrfx_gpiote_handler_config_t handler_config = {

        .handler = pin_irq,

    };

    nrfx_gpiote_input_pin_config_t input_config = {

        .p_pull_config = &pull_config,

        .p_trigger_config = &trigger_config,

        .p_handler_config = &handler_config

    };

    nrfx_gpiote_input_configure(&gpiote, 37, &input_config);

    nrfx_gpiote_trigger_enable(&gpiote, 37, true);//16uA,too hight.(RX:37)

}