working everything properly well

mqtt_display/src/bus/mod.rs

@@ -0,0 +1,23 @@
+// src/bus/mod.rs
+
+use core::cell::RefCell;
+use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
+use embassy_sync::mutex::Mutex;
+use embedded_hal_bus::i2c::RefCellDevice;
+use esp_hal::i2c::master::I2c;
+use esp_hal::Async;
+
+/// The underlying I2C peripheral type for esp-hal 1.0.0-rc.0
+pub type I2cInner = I2c<'static, Async>;
+
+/// We use RefCell to share the bus on a single core.
+/// It's zero-overhead and safe because Embassy tasks don't preempt each other.
+pub type SharedI2c = RefCell<I2cInner>;
+
+/// A handle to a shared I2C device.
+pub type I2cDevice = RefCellDevice<'static, I2cInner>;
+
+/// Create a new I2C device handle from the shared bus.
+pub fn new_device(bus: &'static SharedI2c) -> I2cDevice {
+    RefCellDevice::new(bus)
+}