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esp-rs / std-training

Embedded Rust on Espressif training material.

Home Page:https://esp-rs.github.io/std-training

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Panic when trying to read temperature

GamerBene19 opened this issue · comments

commented

Environment:

  • ESP32-C3-DevKitM-1
  • connected via USB cable to an USB3 port on my computer

Every time I try to read a value from the internal temperature sensor (e.g. with the http-server example) the ESP panics with

Guru Meditation Error: Core  0 panic'ed (Illegal instruction). Exception was unhandled.

Core  0 register dump:
MEPC    : 0x4200083c  RA      : 0x420006f0  SP      : 0x3fc9ab80  GP      : 0x3fc90c00  
0x4200083c - http_server::main
    at ??:??
0x420006f0 - http_server::main
    at /path/to/std-training/intro/http-server/examples/http_server.rs:55
0x3fc9ab80 - _heap_start
    at ??:??
...

From my debugging it seems to occur when start_measurement is executed.

I tried googling for the issue and found this issue which suggests it might be power related. I have plugged in the ESP into ports that are able to supply higher current (powerbank and phone charger), but it seems to experience the same error.
Note: Since I don't have a serial interface on those ports I used the LED to indicate statuses and the color I programmed after the measurement never showed.

I've also tried the code from here to read the temperature in the Arduino IDE, which works.

Any advice would be greatly appreciated, thanks in advance!

commented

The training is intended for ESP32-C3-DevKit-RUST-1 which has an SHTC3 sensor, the ESP32-C3-DevKitM-1 does not contain such sensor, hence the error.

commented

I am working on adding support for Wokwi simulation to the exercises (#168 #154) so soon, you should be able to follow most of the training even without the hardware

commented

The training is intended for ESP32-C3-DevKit-RUST-1 which has an SHTC3 sensor, the ESP32-C3-DevKitM-1 does not contain such sensor, hence the error.

That explains a lot. Thanks for pointing out - somehow I seem to have overlooked that. I just assumed this training would use the ESP32C3's internal temperature sensor which it seems it does not.

You might be the wrong person, but do you know if there is a way to access the internal sensor (linked above) via Rust? It seems to be possible in C as linked in the example above.
I've looked in https://github.com/esp-rs/esp-idf-hal and it does not seem like it contains a driver for the temperature sensor. But I'm not sure if it would be in that repository or if I would have to look somewhere else.

Perhaps you (or someone else) can answer some of my questions.

commented

Just saw that you opened esp-rs/esp-idf-hal#333, I will be closing this issue in favor of that one.

commented

Just saw that you opened esp-rs/esp-idf-hal#333, I will be closing this issue in favor of that one.

Thanks, I forgot to close it yesterday evening.