We powered an ESP32 with 3.3V, and we programmed every IO pin to slowly cycle high/low in open drain output mode with pullups and pulldowns disabled. We then checked for a voltage drop across a 3.3K resistor connected from 5V to each pin. Of course we saw about 5V when the pin switched low, but when...

We see that the above github discussion of this problem is extensive and ongoing. Is there going to be a hardware change to correct it? (A software change probably won't help us since we're directly accessing memory.) We confirmed that our results are similar to those reported by rojer: The problems...

ESP32 AP DNS sets multicast/broadcast routes, breaks other connections As described here: https://www.esp32.com/viewtopic.php?t=4909, the ESP32 wifi AP drivers create a default route that can break internet connections to clients who have other network connections: This problem can be solved by zero...

Laptop using wi-fi for internet access looses connection to internet when a second dongle is used to to connect to an ESP32 at the same time. Also: Reducing unnecessary traffic to the ESP32 to reduce energy consumption and improve cpu availability. We noticed that when a Windows computer connects to...

Our product has a customer pc (usually windows 10) that connects wirelessly to an esp32. We want to be able to update the firmware from time to time without having to run a ftp or web server on the customer machine (and all the problems that entails). Our windows application already has a tcp connec...

The problem has been observed on both UART1 and UART2. It has not been tested on UART0.


How can I be sure to have memory barriers between reads when writing in C code?"

The ESP target low cost embedded systems. IOT. They don't need to run Linux and do everything. That would make them too expensive. The bones of the ESP32 are pretty solid. I suggest focusing on the software and only make small changes to the hardware. - boot from network (flash chip optional. ssid/p...

We ran into a problem with the UART hardware that doesn't seem documented. In our testing this problem only appears when we also use wifi, but we think it might just be triggered by multitasking in general, not necessarily wifi specifically. The problem is that sometimes when we read the FIFO, its h...

I ran into a problem today with the ESP32 that had me pulling out my hair for quite some hours. I ended up devising the following test program in trying to trace it: void app_main() { // Config 2 UARTs uart_config_t uart_config = {1020833, UART_DATA_8_BITS, UART_PARITY_DISABLE, UART_STOP_BITS_1, UAR...

Why is there a lack of applications using the new S2 even though the code base and much of the hardware is the same? Apparently, a built-in USB interface is just not as important as the hardware it replaced? What if the factory code that is already loaded on the ESP32 came with practical OTA (Simple...