WIP

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) {}