Flashing works.

esp/rust/04_no-std-aht20/.cargo/config.toml

@@ -1,16 +1,16 @@
-[build]
+[target.xtensa-esp32-none-elf]
-target = "xtensa-esp32-espidf"
+runner = "espflash flash --monitor --chip esp32"
-
-[target.xtensa-esp32-espidf]
-linker = "ldproxy"
-runner = "espflash flash --monitor"
-rustflags = [ "--cfg",  "espidf_time64"]
-
-[unstable]
-build-std = ["std", "panic_abort"]
 
 [env]
-MCU="esp32"
+ESP_LOG = "info"
-# Note: this variable is not used by the pio builder (`cargo build --features pio`)
-ESP_IDF_VERSION = "v5.3.3"
 
+[build]
+rustflags = [
+    "-C", "link-arg=-Wl,-Tlinkall.x",
+    "-C", "link-arg=-nostartfiles",
+]
+
+target = "xtensa-esp32-none-elf"
+
+[unstable]
+build-std = ["core"]

esp/rust/04_no-std-aht20/Cargo.toml

@@ -1,10 +1,12 @@
 [package]
 name = "aht20"
 version = "0.1.0"
-authors = ["shaun"]
+authors = ["Shaun Reed <shaunrd0@gmail.com>"]
 edition = "2021"
 resolver = "2"
 rust-version = "1.77"
+description = "test"
+publish = false
 
 [[bin]]
 name = "aht20"
@@ -19,17 +21,27 @@ opt-level = "z"
 
 [features]
 default = []
+esp32 = [
+    "esp-backtrace/esp32",
+    "esp-hal/esp32",
+    "esp-bootloader-esp-idf/esp32",
+]
 
-experimental = ["esp-idf-svc/experimental"]
+#experimental = ["esp-idf-svc/experimental"]
 
 [dependencies]
 log = "0.4"
-esp-idf-svc = "0.51"
 embedded-hal = "1.0.0"
-esp-backtrace = "0.17.0"
+esp-backtrace = { version = "0.17.0", features = ["esp32", "println", "panic-handler"] }
-esp-hal = { version = "1.0.0-rc.0", features = ["unstable"] }
+esp-hal = { version = "1.0.0-rc.0", features = ["esp32", "unstable"] }
-fugit = "0.3.7"
+esp-println = { version = "0.15.0", features = ["auto", "log-04"] }
-esp-println = { version = "0.15.0", features = ["log-04"] }
+esp-bootloader-esp-idf = { version = "0.2.0", default-features = false, features = ["esp-rom-sys", "log-04", "esp32"] }
+#esp-rom-sys = { version = "0.1.1", features = ["esp32"] }
+#esp-idf-svc = { version = "0.51", features = [""], default-features = false}
+#esp-idf-hal = "0.45.2"
+#anyhow = "1.0.98"
+#fugit = "0.3.7"
+#esp-rom-sys = { version = "0.1.1", features = ["esp32"] }
 
 # --- Optional Embassy Integration ---
 # esp-idf-svc = { version = "0.51", features = ["critical-section", "embassy-time-driver", "embassy-sync"] }

esp/rust/04_no-std-aht20/build.rs

@@ -1,3 +0,0 @@
-fn main() {
-    embuild::espidf::sysenv::output();
-}

esp/rust/04_no-std-aht20/src/main.rs

@@ -1,6 +1,13 @@
 #![no_std]
 #![no_main]
 
+use embedded_hal::{delay::DelayNs, i2c::I2c as I2cEmbedded};
+use esp_backtrace as _;
+use esp_hal::{
+    delay::Delay,
+    xtensa_lx_rt::entry,
+};
+
 /// Represents a reading from the sensor.
 pub struct SensorReading<T> {
     pub humidity: T,
@@ -111,19 +118,15 @@ impl<I: I2cEmbedded, D: DelayNs> Dht20<I, D> {
     }
 }
 
-use embedded_hal::{delay::DelayNs, i2c::I2c as I2cEmbedded};
+// #[panic_handler]
-use esp_backtrace as _;
+// fn panic(_: &core::panic::PanicInfo) -> ! {
-use esp_hal::{
+//     loop {}
-    clock::CpuClock,
+// }
-    delay::Delay,
-    gpio::{Level, Pull},
-    i2c::master::I2c,
-    xtensa_lx_rt::entry,
-};
-use fugit::{ExtU64, HertzU32};
 
+esp_bootloader_esp_idf::esp_app_desc!();
 #[entry]
 fn main() -> ! {
+
     let peripherals = esp_hal::init(esp_hal::Config::default());
     esp_println::logger::init_logger_from_env();
     let mut delay = Delay::new();
@@ -132,8 +135,8 @@ fn main() -> ! {
     let i2c_for_dht20 =
         esp_hal::i2c::master::I2c::new(peripherals.I2C0, esp_hal::i2c::master::Config::default())
             .unwrap()
-            .with_sda(peripherals.pins.gpio21)
+            .with_sda(peripherals.GPIO21)
-            .with_scl(peripherals.pins.gpio22);
+            .with_scl(peripherals.GPIO22);
     let mut dht20 = Dht20::new(i2c_for_dht20, delay);
 
     loop {