WIP

esp/rust/02_esp-gen-no-std/.cargo/config.toml

@@ -2,6 +2,7 @@
 runner = "espflash flash --monitor --chip esp32"
 
 [env]
+ESP_LOG = "info"
 
 [build]
 rustflags = [

esp/rust/02_esp-gen-no-std/Cargo.lock

@@ -268,12 +268,15 @@ dependencies = [
 ]
 
 [[package]]
-name = "esp-gen-test"
+name = "esp-gen-no-std"
 version = "0.1.0"
 dependencies = [
  "critical-section",
  "esp-bootloader-esp-idf",
  "esp-hal",
+ "esp-println",
+ "fugit",
+ "log",
 ]
 
 [[package]]
@@ -356,6 +359,19 @@ dependencies = [
  "esp-metadata",
 ]
 
+[[package]]
+name = "esp-println"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e7e3ab41e96093d7fd307e93bfc88bd646a8ff23036ebf809e116b18869f719"
+dependencies = [
+ "critical-section",
+ "document-features",
+ "esp-metadata-generated",
+ "log",
+ "portable-atomic",
+]
+
 [[package]]
 name = "esp-riscv-rt"
 version = "0.12.0"

esp/rust/02_esp-gen-no-std/Cargo.toml

@@ -1,11 +1,11 @@
 [package]
 edition      = "2021"
-name         = "esp-gen-test"
+name         = "esp-gen-no-std"
 rust-version = "1.86"
 version      = "0.1.0"
 
 [[bin]]
-name = "esp-gen-test"
+name = "blinky-i2c-scanner"
 path = "./src/bin/main.rs"
 
 [dependencies]
@@ -13,6 +13,9 @@ esp-bootloader-esp-idf = { version = "0.2.0", features = ["esp32"] }
 esp-hal                = { version = "=1.0.0-rc.0", features = ["esp32"] }
 
 critical-section = "1.2.0"
+esp-println = { version = "0.15.0", features = ["esp32", "log-04"] }
+log = "0.4.28"
+fugit = "0.3.7"
 
 
 [profile.dev]

esp/rust/02_esp-gen-no-std/src/bin/main.rs

@@ -6,12 +6,14 @@
     holding buffers for the duration of a data transfer."
 )]
 
+use esp_hal::i2c::master::BusTimeout;
 use esp_hal::{
     clock::CpuClock,
     gpio::{Level, Output, OutputConfig},
     main,
-    time::{Duration, Instant}
+    time::{Duration, Instant},
 };
+use fugit::RateExtU32;
 
 #[panic_handler]
 fn panic(_: &core::panic::PanicInfo) -> ! {
@@ -25,11 +27,29 @@ esp_bootloader_esp_idf::esp_app_desc!();
 #[main]
 fn main() -> ! {
     // generator version: 0.5.0
+    esp_println::logger::init_logger_from_env();
     let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
     let peripherals = esp_hal::init(config);
+    let i2c_config = esp_hal::i2c::master::Config::default().with_timeout(BusTimeout::Maximum);
+    let mut i2c = esp_hal::i2c::master::I2c::new(peripherals.I2C0, i2c_config)
+        .unwrap()
+        .with_sda(peripherals.GPIO21)
+        .with_scl(peripherals.GPIO22);
 
     let mut led = Output::new(peripherals.GPIO2, Level::High, OutputConfig::default());
     loop {
+        log::info!("Scanning for I2C devices..");
+        for i in 0..=127u8 {
+            let res = i2c.read(i, &mut [0]);
+            match res {
+                Ok(_) => {
+                    log::info!("Device found at address: {}", i);
+                }
+                Err(err) => {
+                    log::warn!("Failed to read device address: {:?}", err);
+                }
+            }
+        }
         led.toggle();
         let delay_start = Instant::now();
         while delay_start.elapsed() < Duration::from_millis(500) {}