ECUA UART: add alternative CDC-USB / LPUART1

[BenGardiner]

enables ECU A to use LPUART1 as an alternative command transport (e.g. for Renode simulation or hardware UART adapters) and connects it with ENABLE_ECUA_HOST_INTERACTION (see #72) so that internal CAN transmissions are forwarded over the active serial transport.

Testing included simulating 4-ECU RAMN in Re:node and connecting python-can to the set over LPUART1 over TCP (python-can slcan 'socket://') in J1939 mode

• Simulated 4 ECUs (ECUA, ECUB, ECUC, ECUD) attached to canHub with ECUA.lpuart1 exposed via TCP socket port 29536.
• Executed python-can SLCAN client (socket://127.0.0.1:29536):
  • Broadcast J1939 Address Claim request (0x18EAFFF1) was sent from client 0xF1.
  • Remote ECUs (0x13 Chassis, 0x21 Powertrain, 0x5A Body) responded and were forwarded.
  • Local ECU A (0x2A Headway) claimed its address and its transmitted frame was forwarded to the host over LPUART1

[github-actions]

🔨 Build & Macro Coverage Report

Default Builds — Hex File Sizes

ECU	Debug (tag 15.0)	Debug (tag 2.1.1)	Release (tag 15.0)	Release (tag 2.1.1)
ECUA	547 KiB (560658 bytes)	547 KiB (560658 bytes)	369 KiB (378431 bytes)	369 KiB (378378 bytes)
ECUB	363 KiB (372451 bytes)	363 KiB (372451 bytes)	216 KiB (222166 bytes)	216 KiB (221671 bytes)
ECUC	345 KiB (353325 bytes)	345 KiB (353325 bytes)	196 KiB (201593 bytes)	196 KiB (201082 bytes)
ECUD	354 KiB (363053 bytes)	354 KiB (363053 bytes)	204 KiB (209063 bytes)	203 KiB (208748 bytes)

Macro Coverage Build Results

Variant	Macros Changed	Result	Warnings
ecua_lpuart1_transport	+RAMN_SERIAL_CMD_TRANSPORT_LPUART1 −RAMN_SERIAL_CMD_TRANSPORT_USB_CDC	✅ Pass	5
gsusb	+ENABLE_GSUSB	✅ Pass	5
gsusb_and_bb	+ENABLE_GSUSB +ENABLE_BITBANG	✅ Pass	5
i2c	+ENABLE_I2C	✅ Pass	5
j1939	+DEFAULT_TRAFFIC_MODE=TRAFFIC_MODE_J1939	✅ Pass	5
j1939_showcase_mode	+DEFAULT_TRAFFIC_MODE=TRAFFIC_MODE_J1939 +RAMN_SHOWCASE_MODE	✅ Pass	5
kwp	+ENABLE_KWP	✅ Pass	5
no_debug	−ENABLE_USB_DEBUG −ENABLE_JOYSTICK_CONTROLS −ENABLE_SCREEN −ENABLE_CHIP8 −GENERATE_RUNTIME_STATS	✅ Pass	5
no_dynamic_bitrate	−ENABLE_DYNAMIC_BITRATE	✅ Pass	5
no_extras	−ENABLE_J1979 −ENABLE_MINICTF −ENABLE_CHIP8 −ENABLE_SCREEN −ENABLE_SPI	✅ Pass	5
no_uds	−ENABLE_UDS −ENABLE_UDS_REPROGRAMMING	✅ Pass	6
uart	+ENABLE_UART −ENABLE_CDC −ENABLE_USB	✅ Pass	5
usb_autodetect	+ENABLE_USB_AUTODETECT	✅ Pass	5
watchdog	+WATCHDOG_ENABLE	✅ Pass	5

Source Code Compile Coverage

• Total .c source lines: 22120
• Lines compiled in ≥1 configuration: 20920 (~95%)
• ENABLE_ macro coverage: 23/23 (100.0%) macros tested in both ON and OFF states

Full ENABLE_ Macro Coverage Table

#	Macro	Tested ON	Tested OFF	Covered
1	ENABLE_ADC	default (ECUB, ECUC, ECUD)	default (ECUA)	✅
2	ENABLE_BITBANG	default (ECUA), variant: gsusb_and_bb	default (ECUB, ECUC, ECUD)	✅
3	ENABLE_CDC	default (ECUA)	default (ECUB, ECUC, ECUD), variant: uart	✅
4	ENABLE_CHIP8	default (ECUA)	default (ECUB, ECUC, ECUD), variant: no_debug, variant: no_extras	✅
5	ENABLE_DYNAMIC_BITRATE	default (ECUA, ECUB, ECUC, ECUD)	variant: no_dynamic_bitrate	✅
6	ENABLE_ECUA_HOST_INTERACTION	default (ECUA)	default (ECUB, ECUC, ECUD)	✅
7	ENABLE_GSUSB	variant: gsusb, variant: gsusb_and_bb	default (ECUA, ECUB, ECUC, ECUD)	✅
8	ENABLE_I2C	variant: i2c	default (ECUA, ECUB, ECUC, ECUD)	✅
9	ENABLE_J1979	default (ECUA, ECUB, ECUC, ECUD)	variant: no_extras	✅
10	ENABLE_JOYSTICK_CONTROLS	default (ECUA)	default (ECUB, ECUC, ECUD), variant: no_debug	✅
11	ENABLE_KWP	variant: kwp	default (ECUA, ECUB, ECUC, ECUD)	✅
12	ENABLE_MINICTF	default (ECUA, ECUD)	default (ECUB, ECUC), variant: no_extras	✅
13	ENABLE_SCREEN	default (ECUA)	default (ECUB, ECUC, ECUD), variant: no_debug, variant: no_extras	✅
14	ENABLE_SPI	default (ECUA, ECUD)	default (ECUB, ECUC), variant: no_extras	✅
15	ENABLE_UART	default (ECUA), variant: uart	default (ECUB, ECUC, ECUD)	✅
16	ENABLE_UDS	default (ECUA, ECUB, ECUC, ECUD)	variant: no_uds	✅
17	ENABLE_UDS_REPROGRAMMING	default (ECUA, ECUB, ECUC, ECUD)	variant: no_uds	✅
18	ENABLE_USB	default (ECUA)	default (ECUB, ECUC, ECUD), variant: uart	✅
19	ENABLE_USB_AUTODETECT	variant: usb_autodetect	default (ECUA, ECUB, ECUC, ECUD)	✅
20	ENABLE_USB_DEBUG	default (ECUA)	default (ECUB, ECUC, ECUD), variant: no_debug	✅
21	ENABLE_XCP	default (ECUB, ECUC, ECUD)	default (ECUA)	✅
22	GENERATE_RUNTIME_STATS	default (ECUA, ECUB, ECUC, ECUD)	variant: no_debug	✅
23	WATCHDOG_ENABLE	variant: watchdog	default (ECUA, ECUB, ECUC, ECUD)	✅

[BenGardiner]

@CamilleTTT this PR is a culmination of #70 , #71 , #72 (and #73 itself). If you like the whole set you can just merge this one. Or if there are larger changes to be made in one you can pick and choose.

[BenGardiner]

(also added docker run of the firmwares in a renode container and python-can runtime testing via slcan socket:// for any LPUART builds in the matrix)