Add example with multiple devices on the same bus

> cargo build --examples && sudo ./target/debug/examples/linux-shared

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

Cargo.toml

@@ -17,6 +17,7 @@ pastey = "0.2"
 
 # For the example
 [dev-dependencies]
+embedded-hal-bus = "0.3.0"
 linux-embedded-hal = "0.4.1"
 
 [dependencies.packed_struct]

examples/linux-shared.rs

@@ -0,0 +1,53 @@
+use embedded_hal_bus::i2c::RefCellDevice;
+use linux_embedded_hal::I2cdev;
+use pac194x::{AddrSelect, PAC194X};
+use std::cell::RefCell;
+use std::{thread, time::Duration};
+
+const SENSE_RESISTOR: f32 = 0.5;
+
+fn main() {
+    let i2c = RefCell::new(I2cdev::new("/dev/i2c-3").unwrap());
+
+    let bus_handle1 = RefCellDevice::new(&i2c);
+    let mut sensor1 = PAC194X::new(bus_handle1, AddrSelect::GND).unwrap();
+
+    let bus_handle2 = RefCellDevice::new(&i2c);
+    let mut sensor2 = PAC194X::new(bus_handle2, AddrSelect::_499).unwrap();
+
+    loop {
+        print!("Sensor 1 ");
+        for channel in 1..5 {
+            let bus_voltage = sensor1.read_bus_voltage_n(channel).unwrap();
+            let sense_voltage = sensor1.read_sense_voltage_n(channel).unwrap();
+            print!(
+                "CH{} {:5.2}V, {:5.2}A, ",
+                channel,
+                bus_voltage,
+                sense_voltage / SENSE_RESISTOR
+            );
+        }
+        println!();
+        print!("Sensor 2 ");
+        for channel in 1..5 {
+            let bus_voltage = sensor2.read_bus_voltage_n(channel).unwrap();
+            let sense_voltage = sensor2.read_sense_voltage_n(channel).unwrap();
+            print!(
+                "CH{} {:5.2}V, {:5.2}A, ",
+                channel,
+                bus_voltage,
+                sense_voltage / SENSE_RESISTOR
+            );
+        }
+        println!();
+        println!();
+        sensor1.refresh().unwrap();
+        thread::sleep(Duration::from_millis(100));
+        sensor1.refresh_v().unwrap();
+        thread::sleep(Duration::from_millis(100));
+        sensor2.refresh().unwrap();
+        thread::sleep(Duration::from_millis(100));
+        sensor2.refresh_v().unwrap();
+
+    }
+}