From 170c598216029d921935c37edd71e709f11b935a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Klemens=20Sch=C3=B6lhorn?= <klemens@schoelhorn.eu>
Date: Sun, 31 Mar 2019 15:11:34 +0200
Subject: [PATCH] Read i2c device path from command line

---
 src/main.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index ae95acd..84f5486 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,8 +8,16 @@ use i2cdev_bmp280::*;
 use si7021::*;
 use i2csensors::{Barometer, Hygrometer, Thermometer};
 
+use std::env;
+
 fn main() {
-    let i2c_device = LinuxI2CDevice::new("/dev/i2c-11", 0b1110110).unwrap();
+    let i2c_path = env::args().skip(1).next().expect("i2c bus path (eg. /dev/i2c-1)");
+
+    i2c_sensors(&i2c_path);
+}
+
+fn i2c_sensors(path: &str) {
+    let i2c_device = LinuxI2CDevice::new(path, 0b1110110).unwrap();
 
     let settings = BMP280Settings {
         compensation: BMP280CompensationAlgorithm::Float,
@@ -25,7 +33,7 @@ fn main() {
     println!("pressure: {:6.2} kPa", bmp280.pressure_kpa().unwrap());
     println!("temp1:    {:6.2} °C", bmp280.temperature_celsius().unwrap());
 
-    let device = LinuxI2CDevice::new("/dev/i2c-11", SI7021_I2C_ADDRESS).unwrap();
+    let device = LinuxI2CDevice::new(path, SI7021_I2C_ADDRESS).unwrap();
     let mut si7021 = Si7021::new(device);
     println!("humidity: {:6.2} %", si7021.relative_humidity().unwrap());
     println!("temp2:    {:6.2} °C", si7021.temperature_celsius().unwrap());