rust/ina3221
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Configure i2c device and shunt resistor

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This commit is contained in:
Thomas Klaehn 2025-01-16 13:29:25 +01:00
parent bf5ee0ec78
commit 014b45d517
3 changed files with 8 additions and 8 deletions
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4
examples/current.rs
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@ -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);
}

2
examples/voltage.rs
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@ -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:?}"),

10
src/lib.rs
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@ -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)
}
}
}