STM32G0B1CB with Zephyr sleep power consumption not going below 950uA

[Stratosphere]

Using STM32G0 with zephyr on a board that has motion sensor, flow sensor, Quectel BG770 modem and Quectel FC41D modem. Modem power is controlled by the switch which is being turned off for sleep and various other peripherals are also being disabled but the power consumption won't fall below 950uA. This is my first project using SMT32 on zephyr so I am no expert and need help!

void enterLowPowerMode(void)
{
    int err = 0;
    //TODO - implement low power mode
    // modem_disconnect();
    modem_onOff(false);
    wifi_powerOnOff(false);

    GXHT3x_LowPower();
    // err = pm_device_action_run(motionI2c, PM_DEVICE_ACTION_SUSPEND);
    // err = pm_device_action_run(tempI2c, PM_DEVICE_ACTION_SUSPEND);  

    //I2C pins have external 47K pull ups
    err = gpio_pin_configure(wifi_gpioa_dev, 10, GPIO_DISCONNECTED); //i2c sda
    err = gpio_pin_configure(wifi_gpioa_dev, 9,  GPIO_DISCONNECTED); //i2c scl
    // err = gpio_pin_configure(wifi_gpioa_dev, 10, GPIO_INPUT | GPIO_PULL_UP); //i2c sda
    // err = gpio_pin_configure(wifi_gpioa_dev, 9,  GPIO_INPUT | GPIO_PULL_UP); //i2c scl

    err = gpio_pin_configure(wifi_gpioa_dev, 6, GPIO_DISCONNECTED); //spi miso
    err = gpio_pin_configure(wifi_gpioa_dev, 5, GPIO_DISCONNECTED); //spi sclk
    err = gpio_pin_configure(modem_gpiob_dev, 5, GPIO_DISCONNECTED);    //spi mosi
    err = gpio_pin_configure(modem_gpiob_dev, 4, GPIO_DISCONNECTED);    //spi ce

    //When these blank pins are configured as PULL_DOWN, the current consumption increases to 1.6mA
    //setting them to PULL_UP reduces the current to 0.950 uA
    err = gpio_pin_configure(modem_gpiob_dev, 1, GPIO_INPUT | GPIO_PULL_UP);    //blank
    err = gpio_pin_configure(modem_gpiob_dev, 3, GPIO_INPUT | GPIO_PULL_UP);    //blank
    err = gpio_pin_configure(modem_gpiob_dev, 8, GPIO_INPUT | GPIO_PULL_UP);    //blank
    err = gpio_pin_configure(modem_gpiob_dev, 9, GPIO_INPUT | GPIO_PULL_UP);    //blank
    err = gpio_pin_configure(modem_gpiob_dev, 10, GPIO_INPUT | GPIO_PULL_UP);   //blank
    err = gpio_pin_configure(modem_gpiob_dev, 15, GPIO_INPUT | GPIO_PULL_UP);   //blank

    err = gpio_pin_configure(wifi_gpioa_dev, 4, GPIO_INPUT | GPIO_PULL_UP); //blank

    err = gpio_pin_configure(gpioc_dev, 6, GPIO_INPUT | GPIO_PULL_UP);  //blank
    err = gpio_pin_configure(gpioc_dev, 7, GPIO_INPUT | GPIO_PULL_UP);  //blank
    err = gpio_pin_configure(gpioc_dev, 13, GPIO_INPUT | GPIO_PULL_UP); //blank
    // GPIO_InitTypeDef GPIO_InitStruct = {0};
    // GPIO_InitStruct.Pin = B1_Pin;
    // GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
    // GPIO_InitStruct.Pull = GPIO_NOPULL;
    adc_sleep();
    // sensorI2C_sleep();

    err = gpio_pin_configure(modem_gpiob_dev, 11, GPIO_DISCONNECTED);   //red led
    // err = gpio_pin_configure(gpiod_dev, 0, GPIO_INPUT | GPIO_PULL_UP);   //acc int 2



    modem_uartSleep();
    wifi_uartSleep();
    user_uartSleep();

    err = gpio_pin_configure(wifi_gpioa_dev, 3, GPIO_DISCONNECTED); //user uart tx
    err = gpio_pin_configure(wifi_gpioa_dev, 2, GPIO_DISCONNECTED); //user uart rx

    err = gpio_pin_configure(modem_gpiob_dev, 6, GPIO_DISCONNECTED);    //modem tx
    err = gpio_pin_configure(modem_gpiob_dev, 7, GPIO_DISCONNECTED);    //modem Rx
    err = gpio_pin_configure(modem_gpiob_dev, 13, GPIO_DISCONNECTED);   //lte pwrkey
    err = gpio_pin_configure(modem_gpiob_dev, 14, GPIO_DISCONNECTED);   //lte reset
    err = gpio_pin_configure(wifi_gpioa_dev, 12, GPIO_DISCONNECTED);    //modem rts
    err = gpio_pin_configure(wifi_gpioa_dev, 11, GPIO_DISCONNECTED);    //modem cts

    err = gpio_pin_configure(modem_gpiob_dev, 0, GPIO_DISCONNECTED);    //wifi rx
    err = gpio_pin_configure(modem_gpiob_dev, 2, GPIO_DISCONNECTED);    //wifi tx
    err = gpio_pin_configure(gpiod_dev, 3, GPIO_DISCONNECTED);  //wifi wakeup

    //using PULL DOWN on these pins increases the power consumption
    err = gpio_pin_configure(gpiod_dev, wifiPinReset, GPIO_DISCONNECTED);   //wifi rst
    err = gpio_pin_configure(gpiod_dev, wifiPinOnOff, GPIO_DISCONNECTED);   //wifi on/off

    // err = pm_device_action_run(modem_gpiob_dev, PM_DEVICE_ACTION_SUSPEND);
    // err = pm_device_action_run(gpiod_dev, PM_DEVICE_ACTION_SUSPEND);
    // err = pm_device_action_run(gpioc_dev, PM_DEVICE_ACTION_SUSPEND);
    // HAL_RTCEx_BKUPWrite(Get_RtcHandle(), RTC_BKP_DR1, 0);
    // __HAL_RCC_PWR_CLK_ENABLE();
    // HAL_SuspendTick();
    // HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON,PWR_STOPENTRY_WFI);
    // HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct);

    // __HAL_RCC_PLL_DISABLE();

    // HAL_RCC_GPIOB_CLK_DISABLE();
    // HAL_RCC_GPIOC_CLK_DISABLE();
    // HAL_RCC_GPIOD_CLK_DISABLE();

}

int main(void)
{
	
	// Initialize the storage subsystem
	myStorageInit();
	checkAndUpdateDeviceConfig();

	
	bg770_ioInit();
	terminalUartInit();
	uart1LteInit();
	uarWifieInit();

	msa311_init();
	temp_init();
	adcInit();

	printDeviceConfig();
	// adcInit();
	enterLowPowerMode();

	// pm_state_set(PM_STATE_SUSPEND_TO_IDLE,1);
	/* indefinitely wait for input from the user */
	while (1) {
		k_sleep(K_MINUTES(15));
	}

}

Here is the code and the device tree and proj.conf files are attached.

Regards

[Stratosphere]

Btw,

I can share the schematic privately if you let me know how.

Regards

[Sarra.S]

Hello @Stratosphere, 

I see many peripherals with status = "okay"; in your dts file (adc1, lptim1, i2c1, lse, gpioa, gpiod, gppioc, gpiob, usart1, usart2, usart3, tim3, tim1).

Make sure to enable only peripherals that are required for your application to save power. 

Also, GPIOs can cause increased power consumption if left floating, you're enabling GPIO A,B,C,D, determine which ones are not used, these should be set to input mode with pull-up or pull-down resistors. 

Try to review that and see if there is any decrease!