lis2de12 pedometer

[Mgeen]

I am trying to use the lis2de12 as a activity level detector.

By reading some posts here in the community I guess I need to setup HighPass filtering and a threshold so it gives interrupts everytime there is a movement bigger then a certain force.

But I have no clue how to setup all the registers.  The datasheet only describes how to setup postion detection and fifo etc. I also found a driver but that only has functions to set the registers individualy. I cannot find any samples to setup ( IA1?) motion detection

For example when I look in the datasheet for the HighPass filter there is a mode that

Autoreset on interrupt event. Do I need this ? And do I need to clear the interrupt in a register when there was one ?

[Mgeen]

After some more puzzling and googling I found it out:

First download the standard drivers : https://github.com/STMicroelectronics/STMems_Standard_C_drivers/tree/master/lis2de12_STdC

Then by using the drivers and some nordic nrf51 code

sd_nvic_ClearPendingIRQ(GPIOTE_IRQn);

sd_nvic_DisableIRQ(GPIOTE_IRQn);

enable_GPIO_int();

 

  // Enable Block Data Update , not sure if needed

 lis2de12_block_data_update_set(&dev_ctx, PROPERTY_ENABLE);

 /* Set Output Data Rate to 100Hz */

 lis2de12_data_rate_set(&dev_ctx, LIS2DE12_ODR_100Hz);

 /* Set full scale to 4g */ 

 lis2de12_full_scale_set(&dev_ctx, LIS2DE12_4g);

 lis2de12_high_pass_int_conf_set((dev_ctx), LIS2DE12_ON_INT1_GEN);

 // Configure INTERRUPT 1 Threshold

 lis2de12_int1_gen_threshold_set((dev_ctx), 0xD); // scale = 4G so 0.032 per bit, 14*0.032 = 0.44 G threshold

 // Configure INTERRUPT 1 

 lis2de12_int1_gen_conf_set(dev_ctx, &cfg); // lis2de12_int1_cfg_t in lis2de12_reg.h set only the high parts so xhie,zhie,zhoe, aoi also not set

 lis2de12_int2_pin_notification_mode_set(dev_ctx, LIS2DE12_INT2_LATCHED);

 lis2de12_int1_pin_notification_mode_set(dev_ctx, LIS2DE12_INT1_LATCHED);

 // Route INTERRUPT 1 to PIN 2

lis2de12_pin_int2_config_set(dev_ctx, &ctrl6); // lis2de12_ctrl_reg6_t only set i2_ia1

  

uint8_t test;

 lis2de12_read_reg(&dev_ctx, LIS2DE12_INT1_SRC, (uint8_t*)&test, 1); // clear any pending interrupt

 sd_nvic_EnableIRQ(GPIOTE_IRQn);

I hope it helps somebody so they don't have to search hours on the internet..