Search found 98 matches

by blubb
Thu Apr 12, 2018 5:33 pm
Forum: General Q&A
Topic: Which "sleep mode" is best for this purpose?
Replies: 1
Views: 55

Re: Which "sleep mode" is best for this purpose?

If you send every 15 seconds, it is better to keep the wifi connection. How long does it take to reconnect? Try it.

You also need a timer, so modem sleep would be the best solution (the clock is halted in the higher sleep modes).
by blubb
Sun Apr 08, 2018 5:52 pm
Forum: ESP8266 SDK
Topic: system_phy_freq_trace_enable()
Replies: 3
Views: 102

Re: system_phy_freq_trace_enable()

Documentation is very poor on this api.

If it is improved, I'd also like to know what the numbers mean. If enabled, new stuff like this is logged:

f r0, scandone
sta scan trace -19
reconnect
f r-19, scandone
by blubb
Sat Apr 07, 2018 7:07 am
Forum: ESP8266 HDK
Topic: Is there a serial number or unique ID in the chip
Replies: 10
Views: 17105

Re: Is there a serial number or unique ID in the chip

I've had 100+ esp modules on my lab desk and none had a chip id > 0x00FFFFFF, i.e. only 24 bits (3 bytes from the default mac address). For that reason I use (as unique id) the default mac address instead.
by blubb
Sat Jan 13, 2018 8:51 am
Forum: ESP8266 HDK
Topic: FCC problem - Spectrum analyzer shows unwanted transmission when startup
Replies: 12
Views: 934

Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

Maybe one more idea:
Did you flash the latest esp_init_data_default.bin?
Recently they changed something, so there is a new version "8":
https://github.com/espressif/ESP8266_NO ... master/bin
by blubb
Fri Jan 12, 2018 10:52 pm
Forum: ESP8266 HDK
Topic: FCC problem - Spectrum analyzer shows unwanted transmission when startup
Replies: 12
Views: 934

Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

I recommend opening an issue on github
https://github.com/espressif/ESP8266_NONOS_SDK/issues

Edit:
There are several APIs like
system_phy_set_powerup_option(...);
system_phy_freq_trace_enable(...);
But if the problem occurs before user_rf_pre_init this is a case for a github issue for sure.
by blubb
Fri Jan 12, 2018 6:08 pm
Forum: ESP8266 HDK
Topic: FCC problem - Spectrum analyzer shows unwanted transmission when startup
Replies: 12
Views: 934

Re: FCC problem - Spectrum analyzer shows unwanted transmission when startup

Do you call this API in user_rf_pre_init or in user_init? I wonder if that makes a difference.
by blubb
Sun Dec 24, 2017 12:56 am
Forum: ESP8266 SDK
Topic: Limit WiFi channels for FCC compliance
Replies: 2
Views: 270

Re: Limit WiFi channels for FCC compliance

Oh, and I think the FCC limits are channels 1 to 11 (not 12).
by blubb
Wed Dec 20, 2017 12:24 am
Forum: ESP8266 SDK
Topic: Limit WiFi channels for FCC compliance
Replies: 2
Views: 270

Re: Limit WiFi channels for FCC compliance

Have you tried this?

Code: Select all

wifi_country_t wc = {.cc="USA", .schan=1, .nchan=12, .policy=WIFI_COUNTRY_POLICY_AUTO};
wifi_set_country(&wc);


Edit: Please report if it worked and if calling it in user_init is enough. Otherwise try putting it in user_rf_pre_init, I guess.

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