Hello, I used your example to configure the LIS2DS12, in single TAP mode, but the INT1 pin always remains high even when reading the TAP_SRC register. Could you give me some suggestions of what is missing in the configuration?

[FBald.1]

Single-tap example

Hereafter an example code which implements the SW routine for single-tap detection.

1. Write 60h in CTRL1

// Turn on the accelerometer

// ODR = 400 Hz, FS = ±2 g

2. Write 38h in CTRL3 // Enable tap detection on X, Y, Z-axis

3. Write 09h in TAP_6D_THS // Set tap threshold

4. Write 06h in INT_DUR // Set quiet and shock time windows

5. Write 00h in WAKE_UP_THS // Only single tap enabled (SINGLE_DOUBLE_TAP = 0)

6. Write 40h in CTRL4 // Single-tap interrupt driven to INT1 pin

[Eleon BORLINI]

Hi @FBald.1​ ,

I suggest you to consider the C implementation of the "Single Tap" feature on Github --> lis2ds12_tap_single.c

This code implements not only the configuration, but also the main loop for the interrupt management and clearing.

Here below the detailed script:

/* Main Example --------------------------------------------------------------*/
void lis2ds12_single_tap_(void)
{
 /* Initialize mems driver interface */
 stmdev_ctx_t dev_ctx;
 dev_ctx.write_reg = platform_write;
 dev_ctx.read_reg = platform_read;
 dev_ctx.handle = &SENSOR_BUS;
 
 /* Check device ID */
 lis2ds12_device_id_get(&dev_ctx, &whoamI);
 
 if (whoamI != LIS2DS12_ID)
 while (1) {
 /* manage here device not found */
 }
 
 /* Restore default configuration */
 lis2ds12_reset_set(&dev_ctx, PROPERTY_ENABLE);
 
 do {
 lis2ds12_reset_get(&dev_ctx, &rst);
 } while (rst);
 
 /* Set XL Output Data Rate */
 lis2ds12_xl_data_rate_set(&dev_ctx, LIS2DS12_XL_ODR_400Hz_HR);
 /* Set 2g full XL scale */
 lis2ds12_xl_full_scale_set(&dev_ctx, LIS2DS12_2g);
 /* Enable Tap detection on X, Y, Z */
 lis2ds12_tap_detection_on_z_set(&dev_ctx, PROPERTY_ENABLE);
 lis2ds12_tap_detection_on_y_set(&dev_ctx, PROPERTY_ENABLE);
 lis2ds12_tap_detection_on_x_set(&dev_ctx, PROPERTY_ENABLE);
 lis2ds12_4d_mode_set(&dev_ctx, PROPERTY_ENABLE);
 /* Set Tap threshold to 01001b, therefore the tap threshold is
 * 562.5 mg (= 9 * FS_XL / 2 5 )
 */
 lis2ds12_tap_threshold_set(&dev_ctx, 0x09);
 /* Configure Single Tap parameter */
 //lis2ds12_tap_dur_set(&dev_ctx, 0x0);
 lis2ds12_tap_quiet_set(&dev_ctx, 0x01);
 lis2ds12_tap_shock_set(&dev_ctx, 0x02);
 /* Enable Single Tap detection only */
 lis2ds12_tap_mode_set(&dev_ctx, LIS2DS12_ONLY_SINGLE);
 
 /* Wait Events */
 while (1) {
 lis2ds12_all_sources_t all_source;
 lis2ds12_all_sources_get(&dev_ctx, &all_source);
 
 /* Check if Single Tap events */
 if (all_source.tap_src.single_tap) {
 sprintf((char *)tx_buffer, "Tap Detected\r\n");
 tx_com(tx_buffer, strlen((char const *)tx_buffer));
 }
 }
}

Let me please know if you can find this code useful.

-Eleon