From 014b45d5174b7d05e44c485877861adcf180f4b7 Mon Sep 17 00:00:00 2001
From: Thomas Klaehn <thomas.klaehn@perinet.io>
Date: Thu, 16 Jan 2025 13:29:25 +0100
Subject: [PATCH] Configure i2c device and shunt resistor

---
 examples/current.rs |  4 ++--
 examples/voltage.rs |  2 +-
 src/lib.rs          | 10 +++++-----
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/examples/current.rs b/examples/current.rs
index aaba131..badc5f2 100644
--- a/examples/current.rs
+++ b/examples/current.rs
@@ -1,10 +1,10 @@
 use ina3221;
 
 fn main() {
-    let mut ina = ina3221::Ina3221::new(0x40);
+    let mut ina = ina3221::Ina3221::new(0x40, "/dev/i2c-1", 5.0);
     let res = match ina.current(ina3221::Channel::One) {
         Ok(value) => value,
         Err(error) => panic!("Can't read i2c: {error:?}"),
     };
-    println!("Channel one current: {:?} mA", res);
+    println!("Channel one current: {:?} A", res);
 }
diff --git a/examples/voltage.rs b/examples/voltage.rs
index 4d64483..0515c73 100644
--- a/examples/voltage.rs
+++ b/examples/voltage.rs
@@ -1,7 +1,7 @@
 use ina3221;
 
 fn main() {
-    let mut ina = ina3221::Ina3221::new(0x40);
+    let mut ina = ina3221::Ina3221::new(0x40, "/dev/i2c-1", 5.0);
     let res = match ina.bus_voltage(ina3221::Channel::One) {
         Ok(value) => value,
         Err(error) => panic!("Can't read i2c: {error:?}"),
diff --git a/src/lib.rs b/src/lib.rs
index 13113d9..36aa587 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,11 +17,11 @@ pub struct Ina3221 {
 
 impl Ina3221 {
 
-    pub fn new(slave_address: u16) -> Ina3221 {
+    pub fn new(slave_address: u16, i2c_device: &str, shunt_resistor: f64) -> Ina3221 {
         Ina3221 {
             slave_addr: slave_address,
-            i2c_device: format!("/dev/i2c-1"),
-            shunt_resistor: 1.0,
+            i2c_device: format!("{}", i2c_device),
+            shunt_resistor,
         }
     }
 
@@ -66,7 +66,7 @@ impl Ina3221 {
 
     pub fn current(&mut self, channel: Channel) -> Result<f64, LinuxI2CError> {
         let tmp: f64 = self.shunt_voltage(channel)?;
-        let res: f64 = tmp * self.shunt_resistor;
+        let res: f64 = tmp / self.shunt_resistor * 100.0; // No idea why multiplying with 100 but the result seems to be correct...
         Ok(res)
     }
-}
\ No newline at end of file
+}