Unable to get gpio interrupt from LSM6DS3TR_C to nRF52840 in the Seeed Studio Xiao Ble Sense

[Vivek T Dinesh]

static void IMU_config(void)

{

  uint8_t error=0;

  //Set the Accelerometer control register to work at 6.6kHz Hz,Full Scale 16g

  error+= i2c_reg_write_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_CTRL1_XL,0x90);

  //Set ODR/4

  error+= i2c_reg_write_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_CTRL8_XL,0x1C);

  error +=i2c_reg_write_byte(lsm6ds3tr_c,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_CTRL9_XL,0x34);

  // A wake up threshold of 5042 mg

  error+= i2c_reg_write_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_WAKE_UP_THS,0x0F);

  // Wake up duration is in ms therefore value has to be set to 0x00

  error+= i2c_reg_write_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_WAKE_UP_DUR,0x60);

  // Enables Interrupts

  error+= i2c_reg_write_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_TAP_CFG,0xB1);

  //Routing of Wake up event

  error+= i2c_reg_write_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_MD1_CFG,0x20);

  error+= i2c_reg_write_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_INT1_CTRL,0x43);

  error+= i2c_reg_write_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_MD2_CFG,0x20);

  error+= i2c_reg_write_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_INT2_CTRL,0x03);

}

static void IMU_Sensor(){

   //Rd reg

   i2c_reg_read_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_OUTX_L_XL,&xAccelL);

   i2c_reg_read_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_OUTY_L_XL,&yAccelL);

   i2c_reg_read_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_OUTZ_L_XL,&zAccelL);

   i2c_reg_read_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_OUTX_H_XL,&xAccelH);

   i2c_reg_read_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_OUTY_H_XL,&yAccelH);

   i2c_reg_read_byte(lsm6ds3trc,LSM6DSL_VAL_WHO_AM_I,LSM6DSL_REG_OUTZ_H_XL,&zAccelH);

    x_accRaw = ((int16_t)(xAccelH<<8))|(xAccelL & 0xFF);

    y_accRaw = ((int16_t)(yAccelH<<8))|(yAccelL & 0xFF);

    z_accRaw = ((int16_t)(zAccelH<<8))|(zAccelL & 0xFF);

    x_accRaw = (x_accRaw*0.061)/15;

    y_accRaw = (y_accRaw*0.061)/15;

    z_accRaw = (z_accRaw*0.061)/15;

}

void sleep_handler(nrfx_power_sleep_evt_t current_state )

{

  switch (current_state)

  {

  case NRFX_POWER_SLEEP_EVT_ENTER:

       printf("System sleep\n");

       NRF_POWER->INTENSET=1;//Enables Interrupt

       NRF_POWER->EVENTS_SLEEPENTER=1;// CPU enters wait for WFI/WFE

    break;

  case NRFX_POWER_SLEEP_EVT_EXIT:

       NRF_POWER->EVENTS_SLEEPEXIT=1;//CPU Exits WFI/WFE

        IMU_config();

        IMU_Sensor();

        err = i2c_reg_read_byte(lsm6ds3trc, LSM6DSL_VAL_WHO_AM_I, LSM6DSL_REG_WAKE_UP_SRC, &wkp);

    if (err)

    {

    printf("Failed to read wake-up source.");

    }  

    if(wkp && 0x0F){

       printk("Exceeded Threshold----------------------->\n");

            // Read timestamp

            err = i2c_reg_read_byte(lsm6ds3trc, LSM6DSL_VAL_WHO_AM_I, LSM6DSL_REG_TIMESTAMP0, &timestamp0);

            err = i2c_reg_read_byte(lsm6ds3trc, LSM6DSL_VAL_WHO_AM_I, LSM6DSL_REG_TIMESTAMP1, &timestamp1);

            err = i2c_reg_read_byte(lsm6ds3trc, LSM6DSL_VAL_WHO_AM_I, LSM6DSL_REG_TIMESTAMP2, &timestamp2);

            timestamp = ((uint32_t)timestamp2 << 16) | ((uint16_t)timestamp1 << 8) | timestamp0;

           

                // Calculate acceleration

                pAc = sqrt(sqr(x_accRaw) + sqr(y_accRaw) + sqr(z_accRaw));

                snprintf(X1, sizeof(X1), "Peak %d\n", pAc);

                printk("Acceleration=%s\n", X1);

                // Check if pAc is greater than 4500

                if (pAc > 900)

                {

                ret=gpio_pin_configure_dt(&led_2,GPIO_OUTPUT_ACTIVE);

                bt_ready();

                k_sleep(K_SECONDS(10)); // Delay for 10 seconds

                bt_disable();

                ret=gpio_pin_configure_dt(&led_2,GPIO_OUTPUT_INACTIVE);

               }

                 else

                  {

                   printk("No fall detected\n");

                  }

    }

    else

    {

       printf("No wake up in LSM6DS3.\n");

    }

   

  default:

       //NRF_POWER->TASKS_LOWPWR=1;//Low power mode

    break;

  }

}

// Interrupt Call back function

void lsm6ds3trc_irq_callback(const struct device *port,struct gpio_callback *cb,gpio_port_pins_t pins)

{      

        current_state = NRFX_POWER_SLEEP_EVT_EXIT;

         sleep_handler(current_state);

         printf("Successful Interrupt\n");

         NRFX_DELAY_US(100000);

         current_state=NRFX_POWER_SLEEP_EVT_ENTER;

         sleep_handler(current_state);

}

static struct gpio_callback interrupt_callback={

  .handler=lsm6ds3trc_irq_callback,

};

int main(void)

{

    int err;

   

    if(!device_is_ready(lsm6ds3trc))

    {

      printk("LSM6DS3 device not ready\n");

    }

    IMU_config();

    IMU_Sensor();

    printf("IMU Configured and Sensed\n");

    err=gpio_pin_configure_dt(&irq_pin,GPIO_INPUT);

    if(err!=0){

       printf("Pin not configured\n");

    }

    err=gpio_pin_interrupt_configure_dt(&irq_pin,GPIO_INT_EDGE_RISING);

    if(err!=0){

      printf("Interrupt not configured\n");

    }

    nrf_gpio_cfg_input(irq_pin.pin,NRFX_GPIOTE_DEFAULT_PULL_CONFIG);

    nrf_gpio_cfg_sense_set(irq_pin.pin,NRFX_GPIOTE_ENABLED);

    err = i2c_reg_read_byte(lsm6ds3trc, LSM6DSL_VAL_WHO_AM_I, LSM6DSL_REG_WAKE_UP_SRC, &wkp);

    if (err)

    {

    printf("Failed to read wake-up source.");

    }  

   

    if(wkp && 0x0F){

    gpio_init_callback(&interrupt_callback,lsm6ds3trc_irq_callback,BIT(irq_pin.pin));

    gpio_add_callback(irq_pin.port,&interrupt_callback);

    }

    else

    {

      printf("Wake up threshold not exceeded\n");

    }

    current_state=NRFX_POWER_SLEEP_EVT_ENTER;

    sleep_handler(current_state);

    k_sleep(K_MSEC(100));    

   return 0;

}This the program that I use to make the nRF52840 to go sleep and wake up when an interrupt arrives from lsm6ds3tr_c due to FREE_FALL bit . But it seems like it is not waking up. The same program when used by replacing an external gpio button instead of lsm6ds3tr_c works fine. Could anyone please tell me to find a solution for this.

#define LED2_NODE DT_ALIAS(led2) //BLUE colour LED

#define I2C_NODE DT_NODELABEL(i2c0)

#define INT_NODE DT_NODELABEL(lsm6ds3tr_c)

// Declaration I2C connection of LSM6DS3TRC

static const struct device *lsm6ds3trc = DEVICE_DT_GET(I2C_NODE);

// Declaration of GPIO for pin interrupt

static const struct gpio_dt_spec irq_pin = GPIO_DT_SPEC_GET(INT_NODE,irq_gpios);

// LED declaration

static const struct gpio_dt_spec led_2 = GPIO_DT_SPEC_GET(LED2_NODE, gpios); these are the user defined macros

[runsiv]

Hi

Which version of NCS are you using? Can you also share your prj.conf

When you say sleep, which power mode is it? If it is in system of then you need an external event to wake it up, either on a GPIO or NFC

Regards

Runar

[Vivek T Dinesh]

The NCS version I used is 2.6.1 and the prj.conf of the program is 

CONFIG_GPIO=y

# Increased stack due to settings API usage

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

CONFIG_BT=y

CONFIG_LOG=y

CONFIG_BT_SMP=y

CONFIG_BT_SIGNING=y

CONFIG_BT_PERIPHERAL=y

CONFIG_BT_DIS=y

CONFIG_BT_ATT_PREPARE_COUNT=5

CONFIG_BT_BAS=y

CONFIG_BT_PRIVACY=y

CONFIG_BT_DEVICE_NAME="VFP"

CONFIG_BT_DEVICE_APPEARANCE=833

CONFIG_BT_DEVICE_NAME_DYNAMIC=y

CONFIG_BT_DEVICE_NAME_MAX=65

CONFIG_BT_KEYS_OVERWRITE_OLDEST=y

CONFIG_BT_SETTINGS=y

CONFIG_FLASH=y

CONFIG_FLASH_PAGE_LAYOUT=y

CONFIG_FLASH_MAP=y

CONFIG_NVS=y

CONFIG_SETTINGS=y

CONFIG_EVENTS=y

CONFIG_GPIO_NRFX_INTERRUPT=y

CONFIG_NRFX_GPIOTE_NUM_OF_EVT_HANDLERS=1

CONFIG_NRFX_POWER=y 

I used this header file 

#include <nrfx_power.h> for power management.

[runsiv]

Thank you

So just as you might be aware with NCS we are using an RTOS names Zephyr. With Zephyr there is a number of different sensors supported so that you don't need to write your own driver. I would recommend that you use the zephyr driver and the sensor api instead of trying to write your own. I would recommend by starting with the LSM6DSL sample

Regards

Runar

[Vivek T Dinesh]

But it is mentioned device tree of Seeed Xiao Ble sense that the sensor lsm6dstrc inside it is compatible with LSM6DSL

[runsiv]

Hi 
I think we are talking a bit past each other. Just so that we don't have any misunderstandings. Have you worked with Zephyr before? If not I would recommend that you at least have a look at our NCS Fundamentals course. 
I see that your prj.conf you have not enabled CONFIG_LSM6DSL or any other Kconfig which should be enabled when working with peripherals. I would again advice that you at least take a look at the sample I mentioned in my last reply where you can see how to use the sensor api and the driver that is already in Zephyr

Regards

Runar

[Vivek T Dinesh]

I have tried changes to the prj.config file as you said. Added CONFIG_LSM6DSL=y

[Vivek T Dinesh]

Still unable to get the interrupt from LSM6DS3TR_C, In the program I have used the WAKE_UP_SRC register to check the Free_Fall bit flag raise. I intended to generate gpio interrupt this way.