Search found 870 matches

by ESP_igrr
Sat Dec 09, 2017 5:32 am
Forum: General Discussion
Topic: Help!The output is strange.
Replies: 2
Views: 54

Re: Help!The output is strange.

Please check the note about XTAL frequency in the following document: http://esp-idf.readthedocs.io/en/latest/get-started/index.html#configure Most ESP32 development boards have a 40MHz crystal installed. However, some boards use a 26MHz crystal. If your board uses a 26MHz crystal, or you get garbag...
by ESP_igrr
Fri Dec 08, 2017 4:31 am
Forum: ESP32 HDK
Topic: ESP32 External RTC 32K
Replies: 5
Views: 438

Re: ESP32 External RTC 32K

by ESP_igrr
Wed Dec 06, 2017 1:42 pm
Forum: General Discussion
Topic: Assembly on ESP32
Replies: 3
Views: 171

Re: Assembly on ESP32

Yes, you can get Xtensa Tools evaluation package, which includes the documentation. See https://www.tensilicatools.com/platform/tensilica-sdk/.

(I don't know if they will talk to anyone or only to companies...)
by ESP_igrr
Tue Dec 05, 2017 3:19 am
Forum: News
Topic: Does ESP32 support AIRKISS2.0
Replies: 2
Views: 109

Re: Does ESP32 support AIRKISS2.0

Airkiss should be supported by "smartconfig" library in ESP32. In smartconfig example (https://github.com/espressif/esp-idf/blob/master/examples/wifi/smart_config/main/smartconfig_main.c#L106), try setting the "type" to SC_TYPE_AIRKISS. See http://esp-idf.readthedocs.io/en/latest...
by ESP_igrr
Tue Dec 05, 2017 3:16 am
Forum: ESP32 Arduino
Topic: Directly writing control registers- new programmer feeling pretty lost
Replies: 7
Views: 400

Re: Directly writing control registers- new programmer feeling pretty lost

ESPpeter: Make sure you enable RMT peripheral clock before writing to the control registers. I.e. call periph_module_enable(PERIPH_RMT_MODULE);
by ESP_igrr
Sun Dec 03, 2017 3:19 am
Forum: General Discussion
Topic: Where's the rest of the internal memory?
Replies: 4
Views: 202

Re: Where's the rest of the internal memory?

There is also statically allocated memory (both IRAM and DRAM), you can see the amount by running "make size". Plus a 64kB region of IRAM used for CPU caches.
by ESP_igrr
Sun Dec 03, 2017 3:14 am
Forum: General Discussion
Topic: ULP Clock Source / Frequency
Replies: 2
Views: 94

Re: ULP Clock Source / Frequency

This is described in "low-power management" chapter of the TRM. ULP is clocked from RTC_FAST_CLK, which is either internal 8MHz oscillator (divided by n, configurable), or XTAL (usually 40MHz) divided by 4.
There doesn't seem to be an option to derive RTC_FAST_CLK from a different source.
by ESP_igrr
Sat Dec 02, 2017 2:09 pm
Forum: ESP32 SDK
Topic: SD Card default / high speed
Replies: 1
Views: 74

Re: SD Card default / high speed

High SD card read or write throughput can be achieved only when reading or writing large blocks of data at at a time. For example, reading 64kB blocks using sdmmc_read_blocks function, one can get around 17MB/s throughput in HS mode (compared to about 10MB/s in DS mode). When FATFS library is used, ...
by ESP_igrr
Thu Nov 30, 2017 4:47 am
Forum: ESP32 Arduino
Topic: image build for esp32 is so heavy
Replies: 2
Views: 158

Re: image build for esp32 is so heavy

Can't say for the case of building with Platformio, but with ESP-IDF only the components which are actually used in the application will get linked. For example, blink example is around 125kB, FATFS example is about 300KB, Iperf is around 500kB, if you enable Bluetooth the size will about 1MB or abo...
by ESP_igrr
Wed Nov 29, 2017 3:00 am
Forum: ESP32 SDK
Topic: _FS_LOCK makes f_open return error in IDF 3.0
Replies: 12
Views: 353

Re: _FS_LOCK makes f_open return error in IDF 3.0

Sorry, I don't quite understand the question — do you want to know how to adjust the maximum number of open files? Or how to set FS_LOCK option?

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