Search found 275 matches

by ESP_igrr
Mon Feb 27, 2017 12:43 am
Forum: General Discussion
Topic: Reducing clock frequency
Replies: 1
Views: 13

Re: Reducing clock frequency

WiFi peripheral needs BBPLL to be enabled, but the aforementioned CPU frequency change function will disable it once you go to XTAL_FREQ or lower. Solution for this is to add a call which would allow frequency to be lowered, and another one to request 80MHz APB frequency, to the wifi modem sleep sta...
by ESP_igrr
Sun Feb 26, 2017 2:57 pm
Forum: ESP32 SDK
Topic: Questions about basic button-toggle-led program
Replies: 3
Views: 33

Re: Questions about basic button-toggle-led program

1. pin_bit_mask member of gpio_config_t must be set to a bit mask, not to the pin number: btn_config.pin_bit_mask = (1 << BUTTON_GPIO); Actually if you check serial output, you will see that an error is printed on the console during the gpio_config call, that pin mask is not correct. 2. Don't use pr...
by ESP_igrr
Sun Feb 26, 2017 2:18 pm
Forum: ESP32 Arduino
Topic: Crash in timer interupt when data type "float" is used
Replies: 3
Views: 24

Re: Crash in timer interupt when data type "float" is used

Floats use the FPU while doubles are calculated in software. For reasons, using the FPU inside an interrupt handler is currently not supported.
by ESP_igrr
Sun Feb 26, 2017 2:16 pm
Forum: ESP32 SDK
Topic: Using pins 6-11 on ESP-WROOM-32?
Replies: 3
Views: 25

Re: Using pins 6-11 on ESP-WROOM-32?

Please clarify what you mean by 'pins of ESP-WROOM32': - physical pads of the module, numbered from 1 to 38, or - ESP32 GPIO numbers which are connected to these pads. Kolban's book refers to GPIO numbers. Using GPIOs 6-8 will indeed be problematic because these pins are internally connected to SPI ...
by ESP_igrr
Sun Feb 26, 2017 2:06 pm
Forum: ESP32 SDK
Topic: ESP-IDF, multicore & freeRTOS confusion
Replies: 1
Views: 29

Re: ESP-IDF, multicore & freeRTOS confusion

- Which peripheral (timer) is freeRTOS using to implement scheduler? Or does it support only cooperative multitasking? FreeRTOS is currently configured to use one of the timers built into the CPU core (CCOMPARE0). - Does it utilize both cores? If so, what is the scheduling algorithm? It uses both c...
by ESP_igrr
Fri Feb 24, 2017 9:10 am
Forum: General Discussion
Topic: SDCard card detect and write protect pins
Replies: 5
Views: 66

Re: SDCard card detect and write protect pins

What I meant was "no interrupt callback exposed to the application", sorry for not making this clear. I think at this point if you unplug the card during the transfer, you will eventually get a transfer timeout reported by the SD host. Handling the CD interrupt properly will make the trans...
by ESP_igrr
Fri Feb 24, 2017 7:50 am
Forum: General Discussion
Topic: Using WiFi, energy consumption
Replies: 1
Views: 50

Re: Using WiFi, energy consumption

This can be achieved on both ESP8266/85 and the ESP32, although you may find that ESP32 deep sleep mode is more flexible, as it allows for sleep times >30 minutes (2^32-1 microseconds) and the wakeup triggers are more flexible as well. ESP32 also has lower current consumption in deep sleep: 5uA (in ...
by ESP_igrr
Fri Feb 24, 2017 7:37 am
Forum: General Discussion
Topic: How to transmit video faster via wifi?
Replies: 20
Views: 642

Re: How to transmit video faster via wifi?

Can you try doing a UDP send benchmark without any camera related code running? That will give some indication of the bandwidth you can achieve. There may be a priority conflict if you run your sending task at a priority higher than lwip task. So I suggest setting the priority of the sending task to...
by ESP_igrr
Fri Feb 24, 2017 7:28 am
Forum: General Discussion
Topic: ULP execution flow
Replies: 15
Views: 517

Re: ULP execution flow

deep sleep / ULP example is finished, but we're only going to merge it after 2.0. Currently it polls the on-chip temperature sensor, but I also have some code for polling an ADC which I will integrate in there.
by ESP_igrr
Fri Feb 24, 2017 7:25 am
Forum: General Discussion
Topic: SDCard card detect and write protect pins
Replies: 5
Views: 66

Re: SDCard card detect and write protect pins

Hmm, i think we should handle WP in software, but i have just checked the code and I don't see that happening anywhere. Need to fix this, thanks for pointing this out. As a temporary workaround, please check the state of WP pin in the application before calling sdmmc driver write function. Regarding...

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