unreleased

Nothing for now

v4.1.0

fixed malformatted fatal error telemetry messages (existing ones did not pass CRC checks)
implemented new fatal error telemetry messages (SFM sensor failure, battery deep discharge, calibration errors)
sending "end of production line" telemetry snapshots (used for the UI to show current EOL step)
handling "end of production line" control messages (used to continue to next EOL step)
if hardware buttons are disabled, then the "end of production line" will skip the buttons test step
added automation and convenience scripts (used to compile and flash to auto-detected serial port)
refactored project structure (some directories and files have been moved)

v4.0.0

drop support of electronic hardware v1 and v2 (from now on, minimum compatibility is from v3)
refactor main loop and breathing control (breathing-related computations are now triggered by a hardware timer)
support several breathing modes (PC-CMV stays the default mode, PC-VSAI and PC-AC were added)
added volume controlled ventilation modes (VC-CMV and VC-AC were added)
telemetry protocol v2 was introduced (basically, this means sending more data)
drop support of useless "qualification" and "integration test" modes (both are superseded by the EOL test feature)
add a watchdog for the Raspberry Pi (RPi power supply will be restarted if UI misses sending heartbeats)
allow to set any setting (current or added) using the serial control protocol (new settings were added, and they can all be changed from UI software)
improve breathing control algorithms
remove ability to set peak pressure
allow to snooze alarms or start/stop breathing using the serial control protocol
drop support of old valves and pneumatic systems
make mass flow meter more reliable
support for SFM mass flow meters (SFM3019 and SFM_3300D)
added support for a mass flow meter on the expiratory branch (if it is missing, the expiratory flow rate will be estimated using an algorithm)
turn the green LED on when alarms are snoozed
added a facility to pre-configure the ventilator settings upon boot, using a patient height setting (submitting the patient height will update all ventilation hyperparameters to optimum values)
added configurable alarms for pressure and volume modes, adding to all existing alarms
sending more measured values for display, e.g. respiratory durations and cycles per minute
a more precise battery voltage value is now sent over the telemetry protocol (this is used for battery SoC estimations)
display a special message on LCD screen when watchdog reset was triggered
ability to detect in a reliable way when AC gets off, and that power is switched to battery
allow to retry pressure calibration when it fails
added a ramp-up algorithm on the blower speed controller, in order to prevent current surges in the transformer, which could trigger a temporary handover on batteries (this is a security feature, in cases where batteries would be depleted or not connected, the ventilator would suddenly reboot during use)
added a compilation flag to disable all hardware buttons (this is used for touchscreen-only MakAir devices, i.e. non-traditional ones)
added basic support for the motherboard V3 EEPROM chip over I2C (disabled by default until stable)
a lot of potential exceptions due to possible divisions by zero have been fixed
increase the size of the hardware buffer used by telemetry
improve Doxygen documentation

v3.0.1

fix an issue with the optional mass flow meter

v3.0.0

implement a respiratory trigger (this helps the MakAir to respect the patient respiratory reflexes when he/she starts to wake up; disabled by default)
add an "end of production line" test program (it is included in the production software and runs when booting while pressing a maintainance button; electronic hardware v2+ required)
support Faulhaber motors for valves (they are better, faster, stronger; electronic hardware v2+ required)
support an optional mass flow meter (this allows to estimate the volume of inspired air; electronic hardware v2+ required)
implement a control protocol to update settings through serial communication (UI on Raspberry Pi can now send new settings values; few more settings are supported compared to physical buttons; electronic hardware v2+ required)
support electronic hardware v3
improve pressure control
improve blower speed regulation
fix systick overflow in telemetry protocol
update telemetry protocol to send more information
include CRC in telemetry messages
add a safety to shutdown system if battery is very low (in this situation, everything might get damaged if not shutdown)
change some default settings (now, Ppeak starts at 250 mmH2O and Pplateau at 220 mmH2O)

v1.5.4

improve dynamic update of the peak pressure command according to the measured plateau pressure
fix telemetry bugs
fix minor bugs

v1.5.3

warn if pressure is not stable enough at startup
improve pressure control
fix a regression (the PPeak+ button was not functioning anymore)

v1.5.2

improve pressure control

v1.5.1

calibrate pressure sensor's offset on startup
better round displayed pressure values (in cmH2O)
minor improvement to the pressure control

v1.5.0

rework pressure and blower control (blower will now take more time to ramp up/down but this will greatly improve the stability of injected air volume in many scenario)
rework alarms (better pressure alarms, better battery alarms, better snooze behavior)
improve even more the measured and displayed pressures (if no plateau pressure if found, screen will now display a ? instead of an uncertain value)
tweak the pressure control to make the plateau more accurate
fix an issue with blower not restarting in some cases
make sysclock more accurate
improve code quality (MISRA)
add a step in integration test to check O2 pipe

v1.4.0

This release was depublished

v1.3.2

fix blower control (it used to unexpectedly slow down a bit from times to times)
improve the measured and displayed pressures for peak and plateau

v1.3.1

use the green LED near the start button to show whether the breathing mode is ON or not
disable alarms related to the breathing cycle when program is stopped
fix an issue with a battery alarm being briefly triggered at every boot
integration test: open both valves at startup

v1.3.0

add a program to test integration
support electronic hardware v1 and v2 (v1 by default, v2 through a config flag)
implement start/stop (from now on, machine will begin stopped!)
handle Emerson valves (through a config flag)
improve the way buzzer is controlled

v1.2.3

fix an issue with buzzer (sometimes it was stuck buzzing whereas no alarm were triggered)
add battery-related alarms

v1.2.2

handle several pneumatic systems _(for the first 2 working typologies of prototype)_

v1.2.1

Unreleased

v1.2.0

First release version