Search found 12 matches

by glubuluck
Sun Dec 08, 2019 10:52 am
Forum: ESP32 boards
Topic: use 32k from ds3231 as external rtc clock on esp32
Replies: 2
Views: 454

Re: use 32k from ds3231 as external rtc clock on esp32

Thanks Peter, actually i'm using your library, which is very convenient, thanks for it ! but i'm experiencing an issue : - if i adjust the internal RTC from ds3231 with get_time not so often (a few minutes) : each time i get a jump of 1 or 2 sec - if i adjust often, like every seconds, all my cpu ti...
by glubuluck
Fri Dec 06, 2019 6:33 pm
Forum: ESP32 boards
Topic: use 32k from ds3231 as external rtc clock on esp32
Replies: 2
Views: 454

use 32k from ds3231 as external rtc clock on esp32

Hi, i'm using for an astronomical clock project an ESP32 with an external rtc ( DS3231 ) i had to do this because of the lack of precision of the rtc of the esp. i noticed since i'm using the lightsleep function, an error of about 1% (!) : more than one second every 2 minutes. :shock: i saw there is...
by glubuluck
Fri Jun 28, 2019 9:09 pm
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 29
Views: 3052

Re: double precision float on ESP32

it worked :)

and i'm with 64bit float :P

Code: Select all

>>> 10/3
3.333333333333333
>>> 2*math.acos(0)
3.141592653589793
thanks a lot !

Matthieu
by glubuluck
Fri Jun 28, 2019 7:24 pm
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 29
Views: 3052

Re: double precision float on ESP32

Hey, so i restarted the building from beginning, following this : http://www.microdev.it/wp/en/2018/08/08/esp32-micropython-compiling-for-esp32/ the build went on but stopped on an Error 1 : (...) Traceback (most recent call last): File "/home/matthieu/esp32/esp-idf/tools/ldgen/ldgen.py", line 22, i...
by glubuluck
Wed Jun 26, 2019 9:46 am
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 29
Views: 3052

Re: double precision float on ESP8266 -> ESP32

hey maybe i have to start a new thread for this issue but i cannot build esp32 FW. installed xtensa, esp-idf matthieu@heronux:~/esp/micropython/ports/esp32$ make V=1 fatal: cannot change to '-s': Aucun fichier ou dossier de ce type ** WARNING ** The git hash of ESP IDF does not match the supported v...
by glubuluck
Wed Jun 26, 2019 7:43 am
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 29
Views: 3052

Re: double precision float on ESP8266

Thanks for the hint Roberthh, but i need first to understand how to build the FW.
by glubuluck
Tue Jun 25, 2019 1:17 pm
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 29
Views: 3052

Re: double precision float on ESP8266

Hello, i just purchased an ESP32-WROOM-32, to try the Roberthh's solution : compile custom FW with double float on ESP32. But actually, i need help for that... What do i need ? (sources, compiler..) How to get it work ? sorry but my knowledge in micro-controller is just enough to flash regular FW Th...
by glubuluck
Wed May 22, 2019 8:29 am
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 29
Views: 3052

Re: double precision float on ESP8266

The Pyboard D SF6W has hardware double precision FP. As far as I know the other ports which implement it do it in software. Astronomical work definitely needs DP, especially if you get into things like predicting solar eclipses... Thanks, good to know ! But not the same budget.. And actually i can ...
by glubuluck
Tue May 21, 2019 10:00 pm
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 29
Views: 3052

Re: double precision float on ESP8266

Roberthh : ok then i'll purchase an esp32 to try this. Thanks for helping! ThomasChr : actually i first planned to do this using arduino. And i found out that "single" float was really not enough. That made me move for Python. For example, in astronomical computing, the date/time are expressed in "j...
by glubuluck
Tue May 21, 2019 6:50 pm
Forum: General Discussion and Questions
Topic: double precision float on ESP8266
Replies: 29
Views: 3052

Re: double precision float on ESP8266

Micropython for ESP32 is not different to that for ESP8266. It is only faster and has more RAM. Only you have to build the firmware with double precision float yourself, since there are not suitable pre-built images. People (like me) here can help you to get such an firmware image. Just to be sure ...