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Read lsm6dsv16x fifo using interrupts, only triggers if I remove wire from pin and put back

Associate II

Hey everyone,

I am new to the lsm6dsv16x sensor and I would like to set it up to read the full fifo as an interrupt vs polling due to speed.

I am following the example from github setting up my gpio as an external event for interrupt int1.

But I am having an issue where the interrupt does not trigger unless I remove and put back the wire from the pin on the dev board. And only reads one or two times unless I remove the wire and put it back on the gpio. Any idea why this is happening? 

I am not sure why this is happening. I checked the pin and it is low without the imu interrupt pin, and it stays high with the interrupt pin connected. 
Not sure if I need pull ups or pull downs on the interrupt pin. 
Also, Do I need to  wake up the accelerometer when I need it? or can it stay on at all times?  



void accelerometerInit()
dev_ctx.write_reg = platform_write_two;
	 dev_ctx.read_reg = platform_read_two;
	 dev_ctx.handle = &hspi1;

	 lsm6dsv16x_device_id_get(&dev_ctx, &whoamI);

	  if (whoamI != LSM6DSV16X_ID)
	    while (1);

  /* Restore default configuration */
	lsm6dsv16x_reset_set(&dev_ctx, LSM6DSV16X_RESTORE_CTRL_REGS);
	do {
	  lsm6dsv16x_reset_get(&dev_ctx, &rst);
	} while (rst != LSM6DSV16X_READY);

	  /* Enable Block Data Update */
	  lsm6dsv16x_block_data_update_set(&dev_ctx, PROPERTY_ENABLE);
	  /* Set full scale */
	  lsm6dsv16x_xl_full_scale_set(&dev_ctx, LSM6DSV16X_2g);
	  //lsm6dsv16x_gy_full_scale_set(&dev_ctx, LSM6DSV16X_2000dps);
	   * Set FIFO watermark (number of unread sensor data TAG + 6 bytes
	   * stored in FIFO) to FIFO_WATERMARK samples
	  lsm6dsv16x_fifo_watermark_set(&dev_ctx, FIFO_WATERMARK);
	  /* Set FIFO batch XL/Gyro ODR to 12.5Hz */
	  lsm6dsv16x_fifo_xl_batch_set(&dev_ctx, LSM6DSV16X_XL_BATCHED_AT_3840Hz);
	  /* Set FIFO mode to Stream mode (aka Continuous Mode) */
	  lsm6dsv16x_fifo_mode_set(&dev_ctx, LSM6DSV16X_STREAM_MODE);

	  /* Set Output Data Rate */
	  pin_int.fifo_full= PROPERTY_ENABLE;
	  lsm6dsv16x_pin_int1_route_set(&dev_ctx, &pin_int);
	  lsm6dsv16x_xl_data_rate_set(&dev_ctx, LSM6DSV16X_ODR_AT_3840Hz);
	  //lsm6dsv16x_fifo_timestamp_batch_set(&dev_ctx, LSM6DSV16X_TMSTMP_DEC_8);
	  lsm6dsv16x_timestamp_set(&dev_ctx, PROPERTY_DISABLE);
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
	  if(GPIO_Pin == Interrupt_From_VibrSensor_1_Pin)

void getAccelerometerData(){
	int i = 0;
	int j = 0;
	uint16_t num = 0;
    lsm6dsv16x_fifo_status_get(&dev_ctx, &fifo_status);
    if (fifo_status.fifo_th == 1) {
		num = fifo_status.fifo_level;
		sprintf((char *)tx_buffer, "-- FIFO num %d \r\n", num);
		tx_com(tx_buffer, strlen((char const *)tx_buffer));
		if (fifo_status.fifo_th == 1) {
			  num = fifo_status.fifo_level;
			  sprintf((char *)tx_buffer, "-- FIFO num %d \r\n", num);
			  tx_com(tx_buffer, strlen((char const *)tx_buffer));

			  while (num--) {
				lsm6dsv16x_fifo_out_raw_t f_data;

				/* Read FIFO sensor value */
				lsm6dsv16x_fifo_out_raw_get(&dev_ctx, &f_data);
				datax = (int16_t *)&[0];
				datay = (int16_t *)&[2];
				dataz = (int16_t *)&[4];
				ts = (int32_t *)&[0];

				switch (f_data.tag) {
				case LSM6DSV16X_XL_NC_TAG:
				  sprintf((char *)tx_buffer, "ACC [mg]:\t%4.2f\t%4.2f\t%4.2f\r\n",
				  tx_com(tx_buffer, strlen((char const *)tx_buffer));
				/*case LSM6DSV16X_GY_NC_TAG:
				  sprintf((char *)tx_buffer, "GYR [mdps]:\t%4.2f\t%4.2f\t%4.2f\r\n",
				  tx_com(tx_buffer, strlen((char const *)tx_buffer));
			//	  sprintf((char *)tx_buffer, "TIMESTAMP [ms] %d\r\n", *ts);
				//  tx_com(tx_buffer, strlen((char const *)tx_buffer));





Karl Yamashita
Lead II

Isn't the lsm6dsv16x interrupt active low? I haven't looked at the data sheet for the lsm6dsv16x so I don't know if it's a open collector output? If it is which is more than likely, you'll need a pull-up on the interrupt pin. But also you need to change the GPIO mode to falling edge.

If you find my answers useful, click the accept button so that way others can see the solution.
Associate II

So I looked at the datasheet of the sensor and the sensor is by default push pull. 

Push-pull/open-drain selection on INT1 and INT2 pins. Default value: 0
(0: push-pull mode;
1: open-drain mode)

I  set up according to @Karl Yamashita and still see the same issue.