STHS34PF80 threshold set

[Danny0007]

Hello community,

my sths34pf80 is connected with a wireless MCU through I2C in fast mode. 

during the initial process the function " sths34pf80_presence_threshold_set(&presenceHandle, 200); " is called, sometimes there is no problem, the sths34pf80 can be successfully initialized, it can detect presence and motion.

But it also happens oft: if the ctrl1.odr is 8, then it hangs by excuting sths34pf80_odr_safe_set

(if ctrl.odr is 0, the initial will be successful.)

int32_t sths34pf80_presence_threshold_set(const sths34pf80_ctx_t *ctx, uint16_t val)

{

  sths34pf80_ctrl1_t ctrl1;

  uint8_t odr;

  uint8_t buff[2];

  int32_t ret;

  if ((val & 0x8000U) != 0x0U) {

    /* threshold values are on 15 bits */

    return -1;

  }

  /* Save current odr and enter PD mode */

  ret = sths34pf80_read_reg(ctx, STHS34PF80_CTRL1, (uint8_t *)&ctrl1, 1);

  odr = ctrl1.odr;

  printf("threshold set...1:%d\n", odr);

  ret += sths34pf80_odr_safe_set(ctx, ctrl1, 0);

  buff[1] = (uint8_t)(val / 256U);

  buff[0] = (uint8_t)(val - (buff[1] * 256U));

  ret += sths34pf80_func_cfg_write(ctx, STHS34PF80_PRESENCE_THS, &buff[0], 2);

  ret += sths34pf80_algo_reset(ctx);

  /* Set saved odr back */

  printf("threshold set...2:%d\n", ret);

  ret += sths34pf80_odr_safe_set(ctx, ctrl1, odr);

  printf("threshold set...3:%d\n", ret);

  return ret;

}

here is the output from the console:

Here is the signal on SCL and SDA:

[Danny0007]

after removing the last odr safe set function, everything works fine.

could someone confirm if this is really necessary, if not, I will remove it forever in my code.  

//ret += sths34pf80_odr_safe_set(ctx, ctrl1, odr);

[Federica Bossi]

Hi @Danny0007 ,

This has been fixed in the last driver version that you find here.

Let me know if everything is ok without your workaround that we don't suggest. Thanks 🙂

[Danny0007]

Hi @Federica Bossi 

thanks for reply.

I tested the new release, it´s better than before, but still not perfect, because every time after I pressed reset, one time can be correctly initialised, the other time is still hanged at this function: sths34pf80_odr_safe_set(ctx, ctrl1, odr); 

so only half of time is working. before maybe less.

and if I remove this line, everything works fine again... it´s my old workaroud, but not suggested.

[Federica Bossi]

Hi @Danny0007 ,

Thanks for noticed us this issue, we fixed it in the new version. Could you try to use it and let me know if everything works fine?

Also remember to add the callback to mdelay in the platform:
/* Initialize mems driver interface */
dev_ctx.write_reg = platform_write;
dev_ctx.read_reg = platform_read;
dev_ctx.mdelay = platform_delay;
dev_ctx.handle = &SENSOR_BUS;

[Danny0007]

Hi @Federica Bossi 

I added the mdelay and tested it, but for me it´s the same old.
here is my function:

[Federica Bossi]

Hi @Danny0007 ,

Have you updated the STHS34PF80 to the latest commit fe9905f3?

[Danny0007]

Hi @Federica Bossi 

could you give me a direct link? which repo do you mean?

[Federica Bossi · Accepted solution]

Hi @Danny0007 ,

Here is the link: https://github.com/STMicroelectronics/sths34pf80-pid

Let me know if you solve.

[Danny0007]

Hi @Federica Bossi 

Yes, it´s fixed! works fine after every reset.

Thanks a lot!👍