Here is a list of all files with brief descriptions:

src
drv
anlg
adc_task_function.cpp	ADC voltage and current task function
adc_task_function.hpp	ADC voltage and current task function
convert.cpp	Convert between ADC measurements and SI units
convert.hpp	Convert between ADC measurements and SI units
doxygen.hpp	Analog documentation
init.cpp	Initialize ADC
init.hpp	Initialize ADC
temp_task_function.cpp	ADC temperature task function
temp_task_function.hpp	ADC temperature task function
eth
doxygen.hpp	Ethernet documentation
init.cpp	Initialize Ethernet
init.hpp	Initialize Ethernet
led
bug.cpp	Bug LED
bug.hpp	Bug LED
doxygen.hpp	LED documentation
init.cpp	Initialize LED
init.hpp	Initialize LED
wifi.cpp	WiFi LED
wifi.hpp	WiFi LED
out
susi
zimo
zusi
resume.cpp	Initialize peripherals when resuming ZUSI task
resume.hpp	Initialize peripherals when resuming ZUSI task
suspend.cpp	Deinitialize peripherals when suspending ZUSI task
suspend.hpp	Deinitialize peripherals when suspending ZUSI task
task_function.cpp	ZUSI task function
task_function.hpp	ZUSI task function
init.cpp	Initialize SUSI
init.hpp	Initialize SUSI
track
dcc
resume.cpp	Initialize peripherals when resuming DCC task
resume.hpp	Initialize peripherals when resuming DCC task
suspend.cpp	Deinitialize peripherals when suspending DCC task
suspend.hpp	Deinitialize peripherals when suspending DCC task
task_function.cpp	DCC task function
task_function.hpp	DCC task function
zimo
decup
resume.cpp	Initialize peripherals when resuming DECUP task
resume.hpp	Initialize peripherals when resuming DECUP task
suspend.cpp	Deinitialize peripherals when suspending DECUP task
suspend.hpp	Deinitialize peripherals when suspending DECUP task
task_function.cpp	DECUP task function
task_function.hpp	DECUP task function
mdu
resume.cpp	Initialize peripherals when resuming MDU task
resume.hpp	Initialize peripherals when resuming MDU task
suspend.cpp	Deinitialize peripherals when suspending MDU task
suspend.hpp	Deinitialize peripherals when suspending MDU task
task_function.cpp	MDU task function
task_function.hpp	MDU task function
current_limit.cpp
current_limit.hpp
init.cpp	Initialize MDU and DCC
init.hpp	Initialize MDU and DCC
doxygen.hpp
init.cpp	Initialize low level layer (ADC, track and ZUSI)
init.hpp	Initialize low level layer (ADC, track and ZUSI)
suspend.cpp
suspend.hpp
trace
doxygen.hpp	Trace documentation
init.cpp	Trace (IO pins to toggle for debug purposes)
init.hpp	Trace (IO pins to toggle for debug purposes)
wifi
doxygen.hpp	WiFi documentation
init.cpp	Initialize WiFi
init.hpp	Initialize WiFi
doxygen.hpp	Driver documentation
intf
dns
doxygen.hpp	DNS documentation
init.cpp	Initialize DNS
init.hpp	Initialize DNS
http
doxygen.hpp	HTTP documentation
endpoints.hpp	HTTP and WebSocket endpoints
init.cpp	Initialize HTTP server
init.hpp	Initialize HTTP server
message.hpp	HTTP websocket message
request.hpp	HTTP request
response.hpp	HTTP response
server.cpp	HTTP server
server.hpp	HTTP server
mdns
doxygen.hpp	MDNS documentation
init.cpp	Initialize mDNS
init.hpp	Initialize mDNS
udp
doxygen.hpp	UDP documentation
init.cpp	Initialize UDP
init.hpp	Initialize UDP
usb
doxygen.hpp	USB documentation
init.cpp	Initialize USB
init.hpp	Initialize USB
rx_task_function.cpp	USB receive task function
rx_task_function.hpp	USB receive task function
tx_task_function.cpp	USB transmit task function
tx_task_function.hpp	USB transmit task function
doxygen.hpp	Interface documentation
mem
nvs
accessories.cpp	NVS "accessories" namespace
accessories.hpp	NVS "accessories" namespace
base.cpp	NVS base
base.hpp	NVS base
doxygen.hpp	NVS documentation
init.cpp	Initialize NVS
init.hpp	Initialize NVS
locos.cpp	NVS "locos" namespace
locos.hpp	NVS "locos" namespace
settings.cpp	NVS "settings" namespace
settings.hpp	NVS "settings" namespace
task_function.cpp	NVS task function
task_function.hpp	NVS task function
turnouts.cpp	NVS "turnouts" namespace
turnouts.hpp	NVS "turnouts" namespace
utility.cpp	NVS utilities
utility.hpp	NVS utilities
doxygen.hpp	Memory documentation
mw
dcc
accessories.hpp
accessory.cpp
accessory.hpp
doxygen.hpp	DCC documentation
init.cpp
init.hpp
loco.cpp
loco.hpp
locos.hpp
service.cpp
service.hpp
system_state.cpp
system_state.hpp
turnout.cpp
turnout.hpp
turnouts.hpp
disp
doxygen.hpp	Display documentation
init.cpp	Initialize display
init.hpp	Initialize display
task_function.cpp	Display task function
task_function.hpp	Display task function
ota
doxygen.hpp	OTA documentation
init.cpp
init.hpp
service.cpp	Cover /ota/ endpoint
service.hpp	Cover /ota/ endpoint
roco
z21
init.cpp
init.hpp
service.cpp
service.hpp
doxygen.hpp	ROCO documentation
zimo
decup
init.cpp
init.hpp
service.cpp
service.hpp
mdu
init.cpp
init.hpp
service.cpp
service.hpp
ulf
dcc_ein
task_function.cpp	ULF_DCC_EIN task function
task_function.hpp	ULF_DCC_EIN task function
susiv2
task_function.cpp	ULF_SUSIV2 task function
task_function.hpp	ULF_SUSIV2 task function
init.cpp	Initialize ULF
init.hpp	Initialize ULF
zusi
init.cpp
init.hpp
service.cpp
service.hpp
doxygen.hpp	ZIMO documentation
doxygen.hpp	Middleware documentation
app_main.cpp	ESP-IDF application entry point
config.hpp	Config
doxygen.hpp	Documentation
drv8328_test.cpp	DRV8328 test
log.h	Log macros
task.hpp	Task macros
utility.cpp	General utilities
utility.hpp	General utilities