chore: start rewrite in no_std

.cargo/config.toml

@@ -1,18 +1,16 @@
-[build]
-target = "xtensa-esp32-espidf"
-
-[target.xtensa-esp32-espidf]
-linker = "ldproxy"
-runner = "espflash flash --monitor" # Select this runner for espflash v3.x.x
-rustflags = [ "--cfg",  "espidf_time64"] # Extending time_t for ESP IDF 5: https://github.com/esp-rs/rust/issues/110
+[target.xtensa-esp32-none-elf]
+runner = "espflash flash --monitor"
 
-[unstable]
-build-std = ["std", "panic_abort"]
 
 [env]
-MCU="esp32"
-# Note: this variable is not used by the pio builder (`cargo build --features pio`)
-ESP_IDF_VERSION = "v5.1.1"
+ESP_LOGLEVEL="INFO"
 
-# Workaround for https://github.com/esp-rs/esp-idf-template/issues/174 
-CRATE_CC_NO_DEFAULTS = "1"
+[build]
+rustflags = [
+  "-C", "link-arg=-nostartfiles",
+]
+
+target = "xtensa-esp32-none-elf"
+
+[unstable]
+build-std = ["alloc", "core"]

.gitignore

@@ -5,3 +5,14 @@
 
 /config.yml
 /ota.bin
+
+debug/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# Nix
+result