The interrupt triggers when the logic level of the GPIO pad changes from 1 to 0 (in the above case). So what would happen if we simply readDigital() on that line, as fast as possible? Well it goes 01010101010 as the source comes through the climbing part of my curve. So the problem is that the sourc...

Hi. Can someone in this forum of expertise explain this ESP32 interrupt behaviour, please? I can work around the problem I have, but I obviously have something misunderstood. [/code] 20181123_070851.jpg I'm counting fairly slow pulses (a flashing LED which I sense with a light-dependent resistor). M...

To get the file size one has to open the file and call f.size(). That works. But if opening the file also creates it, the size is wrong. File f = SPIFFS.open("/test.txt", "a"); // this creates the file if it does not exist. Opens for appending data. size_t sz = f.size(); f.size() works if the file a...

@ESP_sprite - thanks, was not aware that digitalWrite was Arduino specific.

Is there a preferred way to set individual pins high or low on the ESP32, other than the port-at-a-time w1ts / w1tc manipulation?

Thanks
Peter

Hi Release of my latest project: I now send camera pixel data directly from the OV7670 to my LCD screen, so the pixel data bypasses the ESP32, and I don't need to use ESP32 I2S or DMA. The ESP32 has to coordinate everything. My demo is at 25 frames per second at 320x240. And the LCD has a touchscree...

@bobtidey - thanks, we live and learn! Makes sense that it works like this.

Peter

@ESP_sprite. Hi - I'm not sure why my topic was moved to Arduino forum. Did I miss something about where this should have gone in the first place?

I'm specifically wanting to know what happens on the ESP32 where I am running this code ...

Thanks
Peter

In some touch-screen detection software I found this code: pinMode(_yp, INPUT); pinMode(_ym, INPUT); digitalWrite(_yp, LOW); digitalWrite(_ym, LOW); Does it mean anything to write to a pin configured for INPUT? Is it possible to make a pin OUTPUT while ensuring its initial value. For example, I want...

There is a nice example at https://github.com/espressif/esp-idf/blob/5401a75badcfc9c20f7818fdf3c683e3da8b2547/components/esp32/spiram_psram.c#L540 that shows how an input GPIO pin can be routed through a pad (with optional inverting of the signal) to another I/O pin. This code sets up such a routing...

On the OV7670 camera, I think I've partially understood the HSTART and HSTOP registers. In the I2S camera code, (and indeed on a few different solutions working with the camera), the authors typically say frameControl(196, 52, 8, 488); //no clue why horizontal needs such strange values So here is a ...