Simple Http-Server of std_training fails because of i2c #277
Description
I am a newbie in Embedded Rust, trying my hands with the material from std_training.
The Simple HTTP Server compiles (w/o any change yet to be done by me) with an warning and then fails. Here's the relevant portion of the output:
I (396) cpu_start: Unicore app
I (405) cpu_start: Pro cpu start user code
I (405) cpu_start: cpu freq: 160000000 Hz
I (405) app_init: Application information:
I (408) app_init: Project name: libespidf
I (413) app_init: App version: 1dd9d9c-dirty
I (418) app_init: Compile time: Nov 2 2025 20:26:27
I (424) app_init: ELF file SHA256: 000000000...
I (429) app_init: ESP-IDF: v5.3
I (434) efuse_init: Min chip rev: v0.3
I (439) efuse_init: Max chip rev: v1.99
I (444) efuse_init: Chip rev: v0.4
I (449) heap_init: Initializing. RAM available for dynamic allocation:
I (456) heap_init: At 3FC98EC0 len 00027140 (156 KiB): RAM
I (462) heap_init: At 3FCC0000 len 0001C710 (113 KiB): Retention RAM
I (469) heap_init: At 3FCDC710 len 00002950 (10 KiB): Retention RAM
I (476) heap_init: At 50000200 len 00001DE8 (7 KiB): RTCRAM
I (483) spi_flash: detected chip: generic
I (487) spi_flash: flash io: dio
W (491) i2c: This driver is an old driver, please migrate your application code to adapt `driver/i2c_master.h` ### Warning
W (501) timer_group: legacy driver is deprecated, please migrate to `driver/gptimer.h` ### Warning
I (510) sleep: Configure to isolate all GPIO pins in sleep state
I (517) sleep: Enable automatic switching of GPIO sleep configuration
I (524) main_task: Started on CPU0
I (524) main_task: Calling app_main()
I (534) pp: pp rom version: 9387209
I (534) net80211: net80211 rom version: 9387209
I (544) wifi:wifi driver task: 3fca460c, prio:23, stack:6656, core=0
I (544) wifi:wifi firmware version: 0caa81945
I (544) wifi:wifi certification version: v7.0At runtime it panics, at this line:
temp_sensor
.lock()
.unwrap()
.start_measurement(PowerMode::NormalMode)
.unwrap(); // <--- panicsNot sure how much of the runt time output will be relevant, but here's a portion:
thread 'main' (1) panicked at src/main.rs:58:10:
called `Result::unwrap()` on an `Err` value: I2c(I2cError { kind: NoAcknowledge(Unknown), cause: ESP_FAIL (error code -1) })
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
abort() was called at PC 0x42026407 on core 0
0x42026407 - std::sys::pal::unix::abort_internal
at /home/nirmalya/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/sys/pal/unix/mod.rs:368
Core 0 register dump:
MEPC : 0x40381228 RA : 0x403861a4 SP : 0x3fc9fb90 GP : 0x3fc92200
0x40381228 - panic_abort
at /home/nirmalya/.espressif/esp-idf/v5.3/components/esp_system/panic.c:463
0x403861a4 - __ubsan_include
at /home/nirmalya/.espressif/esp-idf/v5.3/components/esp_system/ubsan.c:311
0x3fc92200 - s_stub_table
at ??:??
....Cargo.toml has these lines:
[dependencies]
anyhow = "=1.0.95"
embedded-svc = "=0.28.1"
esp-idf-svc = "=0.50.1"
#esp-idf-svc = "=0.51.0"
shtcx = "=1.0.0"
toml-cfg = "=0.1.3"
wifi = { path = "../../common/lib/wifi" }
[build-dependencies]
embuild = "=0.33.0"
toml-cfg = "=0.1.3"Could someone please guide me with the exact instructions to resolve this?