removed all std dependencies … WIP move to embassy pure rust code

rust/.cargo/config.toml

@@ -1,26 +1,28 @@
 [build]
-#target = "xtensa-esp32-espidf"
-target = "riscv32imac-esp-espidf"
+rustflags = [
+  # Required to obtain backtraces (e.g. when using the "esp-backtrace" crate.)
+  # NOTE: May negatively impact performance of produced code
+  "-C", "force-frame-pointers",
+  "-Z", "stack-protector=all",
+]
 
-[target.riscv32imac-esp-espidf]
-linker = "ldproxy"
+target = "riscv32imac-unknown-none-elf"
+
+[target.riscv32imac-unknown-none-elf]
+runner = "espflash flash --monitor --chip esp32c6"
 #runner = "espflash flash --monitor --baud 921600 --partition-table partitions.csv -b no-reset" # Select this runner in case of usb ttl
-runner = "espflash flash --monitor"
+#runner = "espflash flash --monitor"
 #runner = "cargo runner"
 
 
 #runner = "espflash flash --monitor --partition-table partitions.csv -b no-reset" # create upgrade image file for webupload
 # runner = espflash erase-parts otadata  //ensure flash is clean
 
-rustflags = ["--cfg", "espidf_time64"] # Extending time_t for ESP IDF 5: https://github.com/esp-rs/rust/issues/110
-
-[unstable]
-build-std = ["std", "panic_abort"]
-
 [env]
-MCU = "esp32c6"
-# Note: this variable is not used by the pio builder (`cargo build --features pio`)
-ESP_IDF_VERSION = "v5.2.1"
 CHRONO_TZ_TIMEZONE_FILTER = "UTC|America/New_York|America/Chicago|America/Los_Angeles|Europe/London|Europe/Berlin|Europe/Paris|Asia/Tokyo|Asia/Shanghai|Asia/Kolkata|Australia/Sydney|America/Sao_Paulo|Africa/Johannesburg|Asia/Dubai|Pacific/Auckland"
 CARGO_WORKSPACE_DIR = { value = "", relative = true }
-RUST_BACKTRACE = "full"
+ESP_LOG="info"
+
+[unstable]
+build-std = ["alloc", "core"]
+