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...

9 Commits

Author SHA1 Message Date
0fe2d645e2 Show and save set value for PWM limits
Show in PwmSummary the set value, before all PWM duty calculations
instead of the machine value after the calculations. Also save the set
value into the flash store instead of the machine value.
2024-09-30 17:46:42 +08:00
ee26616c09 README: Document PWM value clamping 2024-09-30 17:44:24 +08:00
c3b423b5f4 PwmSummary: Don't show max PWM values
Putting the maximum in PwmSummary has little use - the maximum never
changes throughout the runtime of the firmware and can be replaced by
documentation elsewhere.
2024-09-30 17:44:20 +08:00
ad54842c43 Fix wrong current limit duty cycle calculation
- prev commit assumed setting 3.3V -> 3A current limit which is wrong
- Please refer to the MAX1968 datasheet for the duty cycle
calculation equation
2024-09-25 17:20:29 +08:00
b336c4f993 Remove report mode
As the report mode command breaks the send-receive architecture model of
the command interface, and is deemed an anti-feature, making clients
difficult to write, remove it from the firmware entirely.
2024-09-25 17:19:34 +08:00
680193b34b Fix incorrect dac calibration algo
- Fix abnormally long calibration time
2024-09-20 21:21:14 +08:00
ae4bea0c8a gitignore: Ignore .bin files and __pycache__ 2024-09-19 10:08:58 +08:00
1f2de942e4 flake: Add rlwrap to devShell 2024-09-19 10:06:45 +08:00
1041d3ecbb Improve the VREF calibration routine
* Fix wrong calibration of VREF on startup. Caused new v2.2.2 boards to
wrongly calibrate the zero-point to ~2.2 V instead of 1.5 V.

* Fix bootloop on some boards.

* Adjust watchdog interval accordingly.
2024-09-16 18:14:47 +08:00
11 changed files with 76 additions and 228 deletions

3
.gitignore vendored
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@ -1,2 +1,5 @@
target/
result
*.bin
__pycache__/

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@ -84,9 +84,7 @@ invalidate the first line of input.
### Reading ADC input
Set report mode to `on` for a continuous stream of input data.
The scope of this setting is per TCP session.
ADC input data is provided in reports. Query for the latest report with the command `report`. See the *Reports* section below.
### TCP commands
@ -97,13 +95,11 @@ formatted as line-delimited JSON.
| Syntax | Function |
|----------------------------------|-------------------------------------------------------------------------------|
| `report` | Show current input |
| `report mode` | Show current report mode |
| `report mode <off/on>` | Set report mode |
| `pwm` | Show current PWM settings |
| `pwm <0/1> max_i_pos <amp>` | Set maximum positive output current |
| `pwm <0/1> max_i_neg <amp>` | Set maximum negative output current |
| `pwm <0/1> max_v <volt>` | Set maximum output voltage |
| `pwm <0/1> i_set <amp>` | Disengage PID, set fixed output current |
| `pwm <0/1> max_i_pos <amp>` | Set maximum positive output current, clamped to [0, 2] |
| `pwm <0/1> max_i_neg <amp>` | Set maximum negative output current, clamped to [0, 2] |
| `pwm <0/1> max_v <volt>` | Set maximum output voltage, clamped to [0, 4] |
| `pwm <0/1> i_set <amp>` | Disengage PID, set fixed output current, clamped to [-2, 2] |
| `pwm <0/1> pid` | Let output current to be controlled by the PID |
| `center <0/1> <volt>` | Set the MAX1968 0A-centerpoint to the specified fixed voltage |
| `center <0/1> vref` | Set the MAX1968 0A-centerpoint to measure from VREF |
@ -251,8 +247,7 @@ pwm 0 pid
## Reports
Use the bare `report` command to obtain a single report. Enable
continuous reporting with `report mode on`. Reports are JSON objects
Use the bare `report` command to obtain a single report. Reports are JSON objects
with the following keys.
| Key | Unit | Description |

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@ -63,7 +63,7 @@
name = "thermostat-dev-shell";
packages = with pkgs; [
rust llvm
openocd dfu-util
openocd dfu-util rlwrap
] ++ (with python3Packages; [
numpy matplotlib
]);

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@ -1,6 +1,7 @@
import socket
import json
import logging
import time
class CommandError(Exception):
pass
@ -15,7 +16,7 @@ class Client:
pwm_report = self.get_pwm()
for pwm_channel in pwm_report:
for limit in ["max_i_neg", "max_i_pos", "max_v"]:
if pwm_channel[limit]["value"] == 0.0:
if pwm_channel[limit] == 0.0:
logging.warning("`{}` limit is set to zero on channel {}".format(limit, pwm_channel["channel"]))
def _read_line(self):
@ -52,16 +53,16 @@ class Client:
Example::
[{'channel': 0,
'center': 'vref',
'i_set': {'max': 2.9802790335151985, 'value': -0.02002179650216762},
'max_i_neg': {'max': 3.0, 'value': 3.0},
'max_v': {'max': 5.988, 'value': 5.988},
'max_i_pos': {'max': 3.0, 'value': 3.0}},
'i_set': -0.02002179650216762,
'max_i_neg': 2.0,
'max_v': 3.988,
'max_i_pos': 2.0,
{'channel': 1,
'center': 'vref',
'i_set': {'max': 2.9802790335151985, 'value': -0.02002179650216762},
'max_i_neg': {'max': 3.0, 'value': 3.0},
'max_v': {'max': 5.988, 'value': 5.988},
'max_i_pos': {'max': 3.0, 'value': 3.0}}
'i_set': -0.02002179650216762,
'max_i_neg': 2.0,
'max_v': 3.988,
'max_i_pos': 2.0}
]
"""
return self._get_conf("pwm")
@ -126,9 +127,8 @@ class Client:
'tec_u_meas': 2.5340000000000003,
'pid_output': 2.067581958092247}
"""
self._command("report mode", "on")
while True:
self._socket.sendall("report\n".encode('utf-8'))
line = self._read_line()
if not line:
break
@ -136,6 +136,7 @@ class Client:
yield json.loads(line)
except json.decoder.JSONDecodeError:
pass
time.sleep(0.05)
def set_param(self, topic, channel, field="", value=""):
"""Set configuration parameters

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@ -16,6 +16,7 @@ use uom::si::{
use crate::{
ad7172,
pid,
config::PwmLimits,
steinhart_hart as sh,
command_parser::CenterPoint,
};
@ -32,6 +33,7 @@ pub struct ChannelState {
pub center: CenterPoint,
pub dac_value: ElectricPotential,
pub i_set: ElectricCurrent,
pub pwm_limits: PwmLimits,
pub pid_engaged: bool,
pub pid: pid::Controller,
pub sh: sh::Parameters,
@ -48,6 +50,11 @@ impl ChannelState {
center: CenterPoint::Vref,
dac_value: ElectricPotential::new::<volt>(0.0),
i_set: ElectricCurrent::new::<ampere>(0.0),
pwm_limits: PwmLimits {
max_v: 0.0,
max_i_pos: 0.0,
max_i_neg: 0.0,
},
pid_engaged: false,
pid: pid::Controller::new(pid::Parameters::default()),
sh: sh::Parameters::default(),

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@ -22,6 +22,7 @@ use crate::{
pins::{self, Channel0VRef, Channel1VRef},
steinhart_hart,
};
use crate::timer::sleep;
pub enum PinsAdcReadTarget {
VREF,
@ -44,7 +45,11 @@ pub const MAX_TEC_V: ElectricPotential = ElectricPotential {
units: PhantomData,
value: 4.0,
};
const MAX_TEC_I_DUTY_TO_CURRENT_RATE: ElectricCurrent = ElectricCurrent {
dimension: PhantomData,
units: PhantomData,
value: 1.0 / (10.0 * R_SENSE / 3.3),
};
// DAC chip outputs 0-5v, which is then passed through a resistor dividor to provide 0-3v range
const DAC_OUT_V_MAX: ElectricPotential = ElectricPotential {
dimension: PhantomData,
@ -269,17 +274,6 @@ impl Channels {
}
}
pub fn read_dac_feedback_until_stable(&mut self, channel: usize, tolerance: ElectricPotential) -> ElectricPotential {
let mut prev = self.adc_read(channel, PinsAdcReadTarget::DacVfb, 1);
loop {
let current = self.adc_read(channel, PinsAdcReadTarget::DacVfb, 1);
if (current - prev).abs() < tolerance {
return current;
}
prev = current;
}
}
/// Calibrates the DAC output to match vref of the MAX driver to reduce zero-current offset of the MAX driver output.
///
/// The thermostat DAC applies a control voltage signal to the CTLI pin of MAX driver chip to control its output current.
@ -306,8 +300,7 @@ impl Channels {
let mut start_value = 1;
let mut best_error = ElectricPotential::new::<volt>(100.0);
for step in (0..18).rev() {
let mut prev_value = start_value;
for step in (5..18).rev() {
for value in (start_value..=ad5680::MAX_VALUE).step_by(1 << step) {
match channel {
0 => {
@ -318,14 +311,15 @@ impl Channels {
}
_ => unreachable!(),
}
sleep(10);
let dac_feedback = self.read_dac_feedback_until_stable(channel, ElectricPotential::new::<volt>(0.001));
let dac_feedback = self.adc_read(channel, PinsAdcReadTarget::DacVfb, 64);
let error = target_voltage - dac_feedback;
if error < ElectricPotential::new::<volt>(0.0) {
break;
} else if error < best_error {
best_error = error;
start_value = prev_value;
start_value = value;
let vref = (value as f64 / ad5680::MAX_VALUE as f64) * DAC_OUT_V_MAX;
match channel {
@ -334,8 +328,6 @@ impl Channels {
_ => unreachable!(),
}
}
prev_value = value;
}
}
@ -361,48 +353,16 @@ impl Channels {
}
}
fn get_pwm(&self, channel: usize, pin: PwmPin) -> f64 {
fn get<P: hal::PwmPin<Duty=u16>>(pin: &P) -> f64 {
let duty = pin.get_duty();
let max = pin.get_max_duty();
duty as f64 / (max as f64)
}
match (channel, pin) {
(_, PwmPin::ISet) =>
panic!("i_set is no pwm pin"),
(0, PwmPin::MaxIPos) =>
get(&self.pwm.max_i_pos0),
(0, PwmPin::MaxINeg) =>
get(&self.pwm.max_i_neg0),
(0, PwmPin::MaxV) =>
get(&self.pwm.max_v0),
(1, PwmPin::MaxIPos) =>
get(&self.pwm.max_i_pos1),
(1, PwmPin::MaxINeg) =>
get(&self.pwm.max_i_neg1),
(1, PwmPin::MaxV) =>
get(&self.pwm.max_v1),
_ =>
unreachable!(),
}
pub fn get_max_v(&mut self, channel: usize) -> ElectricPotential {
ElectricPotential::new::<volt>(self.channel_state(channel).pwm_limits.max_v)
}
pub fn get_max_v(&mut self, channel: usize) -> (ElectricPotential, ElectricPotential) {
let max = 4.0 * ElectricPotential::new::<volt>(3.3);
let duty = self.get_pwm(channel, PwmPin::MaxV);
(duty * max, MAX_TEC_V)
pub fn get_max_i_pos(&mut self, channel: usize) -> ElectricCurrent {
ElectricCurrent::new::<ampere>(self.channel_state(channel).pwm_limits.max_i_pos)
}
pub fn get_max_i_pos(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) {
let max = ElectricCurrent::new::<ampere>(3.0);
let duty = self.get_pwm(channel, PwmPin::MaxIPos);
(duty * max, MAX_TEC_I)
}
pub fn get_max_i_neg(&mut self, channel: usize) -> (ElectricCurrent, ElectricCurrent) {
let max = ElectricCurrent::new::<ampere>(3.0);
let duty = self.get_pwm(channel, PwmPin::MaxINeg);
(duty * max, MAX_TEC_I)
pub fn get_max_i_neg(&mut self, channel: usize) -> ElectricCurrent {
ElectricCurrent::new::<ampere>(self.channel_state(channel).pwm_limits.max_i_neg)
}
// Get current passing through TEC
@ -444,23 +404,29 @@ impl Channels {
pub fn set_max_v(&mut self, channel: usize, max_v: ElectricPotential) -> (ElectricPotential, ElectricPotential) {
let max = 4.0 * ElectricPotential::new::<volt>(3.3);
let duty = (max_v.min(MAX_TEC_V).max(ElectricPotential::zero()) / max).get::<ratio>();
let max_v = max_v.min(MAX_TEC_V).max(ElectricPotential::zero());
let duty = (max_v / max).get::<ratio>();
let duty = self.set_pwm(channel, PwmPin::MaxV, duty);
self.channel_state(channel).pwm_limits.max_v = max_v.get::<volt>();
(duty * max, max)
}
pub fn set_max_i_pos(&mut self, channel: usize, max_i_pos: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) {
let max = ElectricCurrent::new::<ampere>(3.0);
let duty = (max_i_pos.min(MAX_TEC_I).max(ElectricCurrent::zero()) / max).get::<ratio>();
let max_i_pos = max_i_pos.min(MAX_TEC_I).max(ElectricCurrent::zero());
let duty = (max_i_pos / MAX_TEC_I_DUTY_TO_CURRENT_RATE).get::<ratio>();
let duty = self.set_pwm(channel, PwmPin::MaxIPos, duty);
(duty * max, max)
self.channel_state(channel).pwm_limits.max_i_pos = max_i_pos.get::<ampere>();
(duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, max)
}
pub fn set_max_i_neg(&mut self, channel: usize, max_i_neg: ElectricCurrent) -> (ElectricCurrent, ElectricCurrent) {
let max = ElectricCurrent::new::<ampere>(3.0);
let duty = (max_i_neg.min(MAX_TEC_I).max(ElectricCurrent::zero()) / max).get::<ratio>();
let max_i_neg = max_i_neg.min(MAX_TEC_I).max(ElectricCurrent::zero());
let duty = (max_i_neg / MAX_TEC_I_DUTY_TO_CURRENT_RATE).get::<ratio>();
let duty = self.set_pwm(channel, PwmPin::MaxINeg, duty);
(duty * max, max)
self.channel_state(channel).pwm_limits.max_i_neg = max_i_neg.get::<ampere>();
(duty * MAX_TEC_I_DUTY_TO_CURRENT_RATE, max)
}
fn report(&mut self, channel: usize) -> Report {
@ -518,10 +484,10 @@ impl Channels {
PwmSummary {
channel,
center: CenterPointJson(self.channel_state(channel).center.clone()),
i_set: (self.get_i(channel), MAX_TEC_I).into(),
max_v: self.get_max_v(channel).into(),
max_i_pos: self.get_max_i_pos(channel).into(),
max_i_neg: self.get_max_i_neg(channel).into(),
i_set: self.get_i(channel),
max_v: self.get_max_v(channel),
max_i_pos: self.get_max_i_pos(channel),
max_i_neg: self.get_max_i_neg(channel),
}
}
@ -603,26 +569,14 @@ impl Serialize for CenterPointJson {
}
}
#[derive(Serialize)]
pub struct PwmSummaryField<T: Serialize> {
value: T,
max: T,
}
impl<T: Serialize> From<(T, T)> for PwmSummaryField<T> {
fn from((value, max): (T, T)) -> Self {
PwmSummaryField { value, max }
}
}
#[derive(Serialize)]
pub struct PwmSummary {
channel: usize,
center: CenterPointJson,
i_set: PwmSummaryField<ElectricCurrent>,
max_v: PwmSummaryField<ElectricPotential>,
max_i_pos: PwmSummaryField<ElectricCurrent>,
max_i_neg: PwmSummaryField<ElectricCurrent>,
i_set: ElectricCurrent,
max_v: ElectricPotential,
max_i_pos: ElectricCurrent,
max_i_neg: ElectricCurrent,
}
#[derive(Serialize)]

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@ -22,7 +22,6 @@ use super::{
config::ChannelConfig,
dfu,
flash_store::FlashStore,
session::Session,
FanCtrl,
hw_rev::HWRev,
};
@ -87,16 +86,6 @@ fn send_line(socket: &mut TcpSocket, data: &[u8]) -> bool {
impl Handler {
fn reporting(socket: &mut TcpSocket) -> Result<Handler, Error> {
send_line(socket, b"{}");
Ok(Handler::Handled)
}
fn show_report_mode(socket: &mut TcpSocket, session: &Session) -> Result<Handler, Error> {
let _ = writeln!(socket, "{{ \"report\": {:?} }}", session.reporting());
Ok(Handler::Handled)
}
fn show_report(socket: &mut TcpSocket, channels: &mut Channels) -> Result<Handler, Error> {
match channels.reports_json() {
Ok(buf) => {
@ -412,11 +401,9 @@ impl Handler {
}
}
pub fn handle_command(command: Command, socket: &mut TcpSocket, channels: &mut Channels, session: &Session, store: &mut FlashStore, ipv4_config: &mut Ipv4Config, fan_ctrl: &mut FanCtrl, hwrev: HWRev) -> Result<Self, Error> {
pub fn handle_command(command: Command, socket: &mut TcpSocket, channels: &mut Channels, store: &mut FlashStore, ipv4_config: &mut Ipv4Config, fan_ctrl: &mut FanCtrl, hwrev: HWRev) -> Result<Self, Error> {
match command {
Command::Quit => Ok(Handler::CloseSocket),
Command::Reporting(_reporting) => Handler::reporting(socket),
Command::Show(ShowCommand::Reporting) => Handler::show_report_mode(socket, session),
Command::Show(ShowCommand::Input) => Handler::show_report(socket, channels),
Command::Show(ShowCommand::Pid) => Handler::show_pid(socket, channels),
Command::Show(ShowCommand::Pwm) => Handler::show_pwm(socket, channels),

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@ -96,7 +96,6 @@ pub struct Ipv4Config {
#[derive(Debug, Clone, PartialEq)]
pub enum ShowCommand {
Input,
Reporting,
Pwm,
Pid,
SteinhartHart,
@ -148,7 +147,6 @@ pub enum Command {
Reset,
Ipv4(Ipv4Config),
Show(ShowCommand),
Reporting(bool),
/// PWM parameter setting
Pwm {
channel: usize,
@ -233,12 +231,6 @@ fn float(input: &[u8]) -> IResult<&[u8], Result<f64, Error>> {
Ok((input, result))
}
fn off_on(input: &[u8]) -> IResult<&[u8], bool> {
alt((value(false, tag("off")),
value(true, tag("on"))
))(input)
}
fn channel(input: &[u8]) -> IResult<&[u8], usize> {
map(one_of("01"), |c| (c as usize) - ('0' as usize))(input)
}
@ -246,24 +238,8 @@ fn channel(input: &[u8]) -> IResult<&[u8], usize> {
fn report(input: &[u8]) -> IResult<&[u8], Command> {
preceded(
tag("report"),
alt((
preceded(
whitespace,
preceded(
tag("mode"),
alt((
preceded(
whitespace,
// `report mode <on | off>` - Switch repoting mode
map(off_on, Command::Reporting)
),
// `report mode` - Show current reporting state
value(Command::Show(ShowCommand::Reporting), end)
))
)),
// `report` - Report once
value(Command::Show(ShowCommand::Input), end)
))
)(input)
}
@ -682,24 +658,6 @@ mod test {
assert_eq!(command, Ok(Command::Show(ShowCommand::Input)));
}
#[test]
fn parse_report_mode() {
let command = Command::parse(b"report mode");
assert_eq!(command, Ok(Command::Show(ShowCommand::Reporting)));
}
#[test]
fn parse_report_mode_on() {
let command = Command::parse(b"report mode on");
assert_eq!(command, Ok(Command::Reporting(true)));
}
#[test]
fn parse_report_mode_off() {
let command = Command::parse(b"report mode off");
assert_eq!(command, Ok(Command::Reporting(false)));
}
#[test]
fn parse_pwm_i_set() {
let command = Command::parse(b"pwm 1 i_set 16383");

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@ -72,17 +72,17 @@ impl ChannelConfig {
}
#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
struct PwmLimits {
max_v: f64,
max_i_pos: f64,
max_i_neg: f64,
pub struct PwmLimits {
pub max_v: f64,
pub max_i_pos: f64,
pub max_i_neg: f64,
}
impl PwmLimits {
pub fn new(channels: &mut Channels, channel: usize) -> Self {
let (max_v, _) = channels.get_max_v(channel);
let (max_i_pos, _) = channels.get_max_i_pos(channel);
let (max_i_neg, _) = channels.get_max_i_neg(channel);
let max_v = channels.get_max_v(channel);
let max_i_pos = channels.get_max_i_pos(channel);
let max_i_neg = channels.get_max_i_neg(channel);
PwmLimits {
max_v: max_v.get::<volt>(),
max_i_pos: max_i_pos.get::<ampere>(),

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@ -180,10 +180,7 @@ fn main() -> ! {
loop {
let mut new_ipv4_config = None;
let instant = Instant::from_millis(i64::from(timer::now()));
let updated_channel = channels.poll_adc(instant);
if let Some(channel) = updated_channel {
server.for_each(|_, session| session.set_report_pending(channel.into()));
}
channels.poll_adc(instant);
fan_ctrl.cycle(channels.current_abs_max_tec_i());
@ -216,7 +213,7 @@ fn main() -> ! {
// Do nothing and feed more data to the line reader in the next loop cycle.
Ok(SessionInput::Nothing) => {}
Ok(SessionInput::Command(command)) => {
match Handler::handle_command(command, &mut socket, &mut channels, session, &mut store, &mut ipv4_config, &mut fan_ctrl, hwrev) {
match Handler::handle_command(command, &mut socket, &mut channels, &mut store, &mut ipv4_config, &mut fan_ctrl, hwrev) {
Ok(Handler::NewIPV4(ip)) => new_ipv4_config = Some(ip),
Ok(Handler::Handled) => {},
Ok(Handler::CloseSocket) => socket.close(),
@ -231,19 +228,6 @@ fn main() -> ! {
Err(_) =>
socket.close(),
}
} else if socket.can_send() {
if let Some(channel) = session.is_report_pending() {
match channels.reports_json() {
Ok(buf) => {
send_line(&mut socket, &buf[..]);
session.mark_report_sent(channel);
}
Err(e) => {
error!("unable to serialize report: {:?}", e);
}
}
}
}
});
} else {

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@ -1,5 +1,4 @@
use super::command_parser::{Command, Error as ParserError};
use super::channels::CHANNELS;
const MAX_LINE_LEN: usize = 64;
@ -53,8 +52,6 @@ impl From<Result<Command, ParserError>> for SessionInput {
pub struct Session {
reader: LineReader,
reporting: bool,
report_pending: [bool; CHANNELS],
}
impl Default for Session {
@ -67,43 +64,11 @@ impl Session {
pub fn new() -> Self {
Session {
reader: LineReader::new(),
reporting: false,
report_pending: [false; CHANNELS],
}
}
pub fn reset(&mut self) {
self.reader = LineReader::new();
self.reporting = false;
self.report_pending = [false; CHANNELS];
}
pub fn reporting(&self) -> bool {
self.reporting
}
pub fn set_report_pending(&mut self, channel: usize) {
if self.reporting {
self.report_pending[channel] = true;
}
}
pub fn is_report_pending(&self) -> Option<usize> {
if ! self.reporting {
None
} else {
self.report_pending.iter()
.enumerate()
.fold(None, |result, (channel, report_pending)| {
result.or_else(|| {
if *report_pending { Some(channel) } else { None }
})
})
}
}
pub fn mark_report_sent(&mut self, channel: usize) {
self.report_pending[channel] = false;
}
pub fn feed(&mut self, buf: &[u8]) -> (usize, SessionInput) {
@ -114,12 +79,6 @@ impl Session {
match line {
Some(line) => {
let command = Command::parse(&line);
match command {
Ok(Command::Reporting(reporting)) => {
self.reporting = reporting;
}
_ => {}
}
return (buf_bytes, command.into());
}
None => {}