```rust
use static_cell::make_static;

pub(crate) struct I2cBus2 {
   adc: Tla2528<RefCellDevice<'static, I2c<'static, I2C1>>>,
   board_temp: MCP9808<RefCellDevice<'static, I2c<'static, I2C1>>>,
}

impl I2cBus2 {
   pub fn new(peri: I2C1, scl: PB8, sda: PB7) -> Self {
       let mut i2c_config = Config::default();
       i2c_config.transaction_timeout = Duration::from_millis(100);
       let i2c = I2c::new(peri, scl, sda, Irqs, NoDma, NoDma, khz(400), i2c_config);
       let i2c_ref_cell = &*make_static!(RefCell::new(i2c));
       Self {
           adc: Tla2528::new(i2c::RefCellDevice::new(i2c_ref_cell), 0b_0001_0011),
           board_temp: MCP9808::new(i2c::RefCellDevice::new(i2c_ref_cell)),
       }
   }
}