Search found 7 matches

by pathob
Thu Mar 15, 2018 11:11 am
Forum: General Discussion
Topic: Wifi / Bluetooth Problems with custom Board
Replies: 6
Views: 2036

Re: Wifi / Bluetooth Problems with custom Board

Thanks for your replies! Yes, we already checked the frequency on a spectrum analyzer and it looked good. And yes, we have a full ground plane under the crystal. And today, I removed the 40 MHz crystal and soldered a 26 MHz crystal taken from an ESP-01 on the board. Now, even scanning did not work a...
by pathob
Tue Mar 13, 2018 5:43 pm
Forum: General Discussion
Topic: Wifi / Bluetooth Problems with custom Board
Replies: 6
Views: 2036

Re: Wifi / Bluetooth Problems with custom Board

No suggestions?
by pathob
Thu Mar 01, 2018 12:08 pm
Forum: General Discussion
Topic: Wifi / Bluetooth Problems with custom Board
Replies: 6
Views: 2036

Wifi / Bluetooth Problems with custom Board

Hi, we have developed a custom board based on the ESP32 (ESP32D0WDQ5, revision 0) and are facing major problems with Wifi and Bluetooth. We are not able to connect to a station or to create an access point at all. The only thing that is working is scanning for networks. For example, this project (ht...
by pathob
Thu Oct 19, 2017 9:23 am
Forum: ESP32 IDF
Topic: Reduce external interrupt latency
Replies: 12
Views: 3767

Re: Reduce external interrupt latency

So, today I had access to the oscilloscope again and this time I added "portYIELD_FROM_ISR" to my ISR handler so that I got the following: static void IRAM_ATTR isr_handler(void* args) { gpio_num_t gpio_num = (gpio_num_t) args; xQueueSendFromISR(intr_queue, &gpio_num, NULL); portYIELD_FROM_ISR(); } ...
by pathob
Tue Oct 10, 2017 5:34 am
Forum: ESP32 IDF
Topic: Reduce external interrupt latency
Replies: 12
Views: 3767

Re: Reduce interrupt latency

I tried it a while ago and caused an exception.
by pathob
Mon Oct 09, 2017 11:01 am
Forum: ESP32 IDF
Topic: Reduce external interrupt latency
Replies: 12
Views: 3767

Re: Reduce interrupt latency

Hi Angus, it is basically the GPIO example. I did a measurement again, the exact delay is 16 us. #include "esp_log.h" #include "esp_intr_alloc.h" #include "driver/gpio.h" #include "freertos/FreeRTOS.h" #include "freertos/portmacro.h" #include "freertos/queue.h" #include "freertos/task.h" #define GPI...
by pathob
Sun Oct 08, 2017 9:55 pm
Forum: ESP32 IDF
Topic: Reduce external interrupt latency
Replies: 12
Views: 3767

Reduce external interrupt latency

Hi, we are doing some stuff with an external RF transceiver and need to respond to its interrupts as fast as (technically) possible. Writing into a queue in order to handle the interrupt in another task takes way too much time (about 13 us). Setting a bit and polling this bit in another task within ...

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