Nrf52840 float precision is not enough

[john.liu]

I need to be accurate to five decimal places.

Use nrf52840 and ses.

Test code:

void double_test()
{
  double d;
  char mm[]="42.4158";
  d=atof(mm)/60.0+22;
  gps_location.la = d;
}

 

Execute d=atof(mm)/60.0 result 0.70693.It's right.

But execute  d = 0.70693+22 result 22.7069.It is missing a decimal place.

I need to be accurate to five decimal places.So what should I do?

[Priyanka]

Hi John,

Could you try executing  d = 0.70693+22.0 instead?

Best Regards,

Priyanka

[john.liu]

Hi Priyanka,

It still can't be solved.

[Nguyen Hoan Hoang]

is the variable gps_location.la a double not float ? Did you check ?

[john.liu]

Hi:

[Nguyen Hoan Hoang]

Might be just the debug watch default is float.  Try to change it to double

[john.liu]

hi:

Where to modify it?