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|
//! Host-side control interface for B&K Precision 16xB Power Supplies.
//!
//! The library optimizes for the 1687B and 1688B models. This library
//! doe not support two decimal places for current on the 1685B model.
//!
//! This library has no affiliation with B&K Precision.
use std::{
fmt::{Debug, Display},
str::from_utf8,
};
use serialport::SerialPort;
pub use serialport::{Error as SerialError, ErrorKind as SerialErrorKind};
pub enum Error {
UnexpectedResponse,
Parse,
Serial(SerialError),
}
impl From<SerialError> for Error {
fn from(value: SerialError) -> Self {
Self::Serial(value)
}
}
impl From<std::io::Error> for Error {
fn from(value: std::io::Error) -> Self {
Self::Serial(value.into())
}
}
impl From<std::num::ParseFloatError> for Error {
fn from(_: std::num::ParseFloatError) -> Self {
Self::Parse
}
}
impl From<std::str::Utf8Error> for Error {
fn from(_: std::str::Utf8Error) -> Self {
Self::Parse
}
}
pub type Result<T> = std::result::Result<T, Error>;
/// An interface to the power supply.
pub struct PowerSupply {
port: Box<dyn SerialPort>,
}
impl PowerSupply {
pub fn open(path: impl AsRef<str>) -> Result<Self> {
serialport::new(path.as_ref(), 9600)
.data_bits(serialport::DataBits::Eight)
.parity(serialport::Parity::None)
.stop_bits(serialport::StopBits::One)
.flow_control(serialport::FlowControl::None)
.timeout(std::time::Duration::from_millis(100))
.open()
.map(|port| PowerSupply { port })
.map_err(From::from)
}
fn parse_volts(&mut self) -> Result<f64> {
let mut buff = [0u8; 3];
self.port.read_exact(&mut buff)?;
let volts: f64 = from_utf8(&buff)?.parse()?;
Ok(volts / 10.0)
}
fn parse_current(&mut self) -> Result<f64> {
let mut buff = [0u8; 3];
self.port.read_exact(&mut buff)?;
let current: f64 = from_utf8(&buff)?.parse()?;
Ok(current / 10.0)
}
fn parse_cr(&mut self) -> Result<()> {
let mut buff = [0; 1];
self.port.read_exact(&mut buff)?;
if buff[0] == b'\r' {
Ok(())
} else {
Err(Error::UnexpectedResponse)
}
}
fn parse_ok(&mut self) -> Result<()> {
let mut buff = [0; 2];
self.port.read_exact(&mut buff)?;
if &buff == b"OK" {
Ok(())
} else {
Err(Error::UnexpectedResponse)
}
}
fn parse_end(&mut self) -> Result<()> {
self.parse_ok()?;
self.parse_cr()?;
Ok(())
}
fn write_command(&mut self, cmd: &[u8]) -> Result<()> {
self.port.write_all(cmd)?;
self.port.flush()?;
Ok(())
}
/// Set the supply output state.
pub fn set_output(&mut self, output: Output) -> Result<()> {
self.write_command(match output {
Output::Off => b"SOUT1\r",
Output::On => b"SOUT0\r",
})?;
self.parse_end()?;
Ok(())
}
/// Read the supply's maximum voltage and current.
pub fn max_voltage_current(&mut self) -> Result<(f64, f64)> {
self.write_command(b"GMAX\r")?;
let volts = self.parse_volts()?;
let amps = self.parse_current()?;
self.parse_end()?;
Ok((volts, amps))
}
}
/// The power supply output state.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Output {
/// Supply off.
Off,
/// Supply on.
On,
}
impl From<bool> for Output {
fn from(value: bool) -> Self {
if value {
Self::On
} else {
Self::Off
}
}
}
/// Power supply model
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[non_exhaustive]
pub enum Model {
/// BK Precision 1687B.
///
/// 36V - 10A.
Bkp1687B,
}
/// A voltage setting.
///
/// This has a 0.1V resolution across all power supply models.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Voltage(
u32, /* Internally represented as mV; see GETD command. */
);
impl Display for Voltage {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {}
}
impl Voltage {
pub const fn from_f64_v(volts: f64) -> Voltage {
Voltage((volts * 1000.0f64) as u32)
}
pub const fn from_f32_v(volts: f32) -> Voltage {
Voltage((volts * 1000.0f32) as u32)
}
pub const fn from_mv(millivolts: u32) -> Voltage {
Voltage(millivolts / 10 * 10)
}
}
/// A current setting.
///
/// On the 1687B and 1688B models, this has
/// a 0.1A resolution. On the 1685B model, this
/// has a 0.01A resolution.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Current(
u32, /* Internally represented as mA; see GETD command. */
);
impl Current {
pub const fn from_f64_a(amps: f64) -> Current {
Current((amps * 1000.0f64) as u32)
}
pub const fn from_f32_a(amps: f32) -> Current {
Current((amps * 1000.0f32) as u32)
}
pub const fn from_ma(milliamps: u32) -> Current {
Current(milliamps)
}
}
|
