From 1d63fb5d93cf1d8f441b1b37e5220548c27cc72f Mon Sep 17 00:00:00 2001
From: Priec <filippriec@gmail.com>
Date: Mon, 4 May 2026 23:23:28 +0200
Subject: [PATCH] i2c read from the sensor

---
 tprais_semestralka1/.gitignore      |  1 +
 tprais_semestralka1/src/bin/main.rs | 22 +++++++++++++++++++---
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/tprais_semestralka1/.gitignore b/tprais_semestralka1/.gitignore
index ea52893..75e5363 100644
--- a/tprais_semestralka1/.gitignore
+++ b/tprais_semestralka1/.gitignore
@@ -5,6 +5,7 @@ target/
 .zed/
 .helix/
 .env
+LPS22HB.PDF
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
diff --git a/tprais_semestralka1/src/bin/main.rs b/tprais_semestralka1/src/bin/main.rs
index 8d88012..1ce5d5b 100644
--- a/tprais_semestralka1/src/bin/main.rs
+++ b/tprais_semestralka1/src/bin/main.rs
@@ -13,6 +13,10 @@ use embassy_net::{Runner, StackResources};
 use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
 use embassy_sync::signal::Signal;
 use embassy_time::{Duration, Instant, Timer};
+use esp_hal::{
+    i2c::master::{Config, I2c},
+    Async,
+};
 use projekt_final::mqtt::client::{mqtt_publish, mqtt_task};
 
 use esp_alloc as _;
@@ -59,14 +63,26 @@ esp_bootloader_esp_idf::esp_app_desc!();
 #[esp_hal_embassy::main]
 async fn main(spawner: Spawner) -> ! {
     esp_println::logger::init_logger_from_env();
-    info!("===============================");
-    info!("  ESP32 IoT Firmware Starting");
-    info!("===============================");
+    info!("ESP32 IoT Firmware Starting");
 
     let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
     let peripherals = esp_hal::init(config);
     esp_alloc::heap_allocator!(size: 72 * 1024);
 
+    let i2c_config = Config::default().with_frequency(esp_hal::time::Rate::from_khz(400));
+    info!("Init I2C");
+    let mut i2c = I2c::new(peripherals.I2C0, i2c_config)
+        .expect("Failed to init i2c")
+        .with_sda(peripherals.GPIO21)
+        .with_scl(peripherals.GPIO22)
+        .into_async();
+
+    let mut buffer = [0u8; 1];
+    let SAD = 0x5C;
+    let SUB = &[0x0F];
+    i2c.write_read_async(SAD, SUB, &mut buffer).await.unwrap();
+    info!("WHO_AM_I: {:x}", buffer[0]);
+
     info!("Initializing WiFi...");
     let timg0 = TimerGroup::new(peripherals.TIMG0);
     let mut rng = Rng::new(peripherals.RNG);