ESP32-CAM Hardware Serial Pins

Using Arduino Project Guidance
1

Hi,
I have an ESP32-CAM board. I was using the U0R and U0T for Serial debugging and flashing. And also I was using the 14 and 15 pins for SoftwareSerial for communicate with another module.

However, I got "Guru Meditation Error: Core 1 panic'ed (LoadProhibited). Exception was unhandled." error while I were initiailizing the SoftwareSerial. GPT4 said that it might be caused by the pin selection and I tried with 12 13 pins but the results were same. Now I decided to use "HarwareSerial". But most of the users say that HardwareSerial pins are 16 and 17 but when I have a take look to the pin layout there is no GPIO 17.

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As you see that GPIO 16 have "U2RXD" but there is no U2TXD :clown_face:. Am I missing something or there is no feature for HardwareSerial in ESP32-CAM?

Also the Core error might not be caused by the pin selection. If you are sure that the error caused by different problem (I think so but I am hopeless :confused: ) Inform me I can open new thread for the general error handling.

Thank you for your attention...

2

If you search using google vs. ChatGPT, you'd probably find better answers. It appears you are corrupting memory, either by over-writing strings or a stack overflow... Since you didn't post your code, only you know.

3

Your missing something, you can allocate the pins used for hardware serial like this;


#define RXD2 xx               //replace xx with serial RX pin 
#define TXD2 xx               //replace xx with serial TX pin

 Serial2.begin(115200, SERIAL_8N1, RXD2, TXD2);  //monitor port, format is Serial2.begin(baud-rate, protocol, RX pin, TX pin);
4

Thank you @srnet but I know this usage of the Hardware Serial. The issue is, which pins are useable for Hardware serial.

5

I think most, if not all are usable. Try different ones, using the approach in post #3 and let us know if any DON'T work. Everything I have tried does work.

GPT4 said that it might be caused by the pin selection

Nonsense.

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6

Use GPIO_16 and GPIO_0 or 4 or 2 or 14 or 15 or 13 or 12 depending upon what else will be connected to the thingy.

Software serial does not work with the ESP32's.

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7

There is an ESP32 version of the library available but why would you use it ?

8

Thank you for all your answers but I have handled the situation with using the U0R and U0T. And connect paralell with pc and the module. Otherwise I couldn't solve it.

9

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