sc2-steering-wheel

ESP32 firmware for the steering-wheel HMI.

The board sends driver IO on CAN. The display shows various data about the cars modes, speed, bms, etc. The odometer value is stored in NVS.

Repository origin: This Car 2.5 repository was created from the v2.0.00 tag of the original badgerloop-software/sc2-steering-wheel repository. The starting commit is 445536f.

Build

1. Run git submodule update --init.
2. Run pio run.

Tasks

main.cpp starts these FreeRTOS tasks:

Task	Core	Rate	Role
ioTask	0	100 Hz	Read pedals and buttons
canRxTask	0	about 1 ms	Read BMS and telem frames
canTxTask	0	50 Hz	Send driver inputs
displayTask	1	20 Hz	Update odometer and TFT

Modules

1. IOManagement reads pins, sets pedal scale, toggles buttons, and counts laps.
2. canSteering receives BMS, speed, and fault frames. It sends 0x300 through 0x304.
3. display draws the UI.
4. odometer stores tenths of a mile in NVS.

CAN IDs

Transmit:

• 0x300 digital pack
• 0x301 regen
• 0x302 throttle
• 0x303 eco or power mode
• 0x304 hazards

Receive:

• 0x108 and 0x109 BMS
• 0x208 mph from the PDC
• 0x001 BPS fault from powertrain (0x01 means fault)

Pins

Function	Pin
Throttle ADC	12
Regen button	35
Left blink	34
Right blink	5
Direction	32
Horn	33
Hazards	14
Drive mode	4
Lap increment	26
Lap decrement	27
CAN TX	21
CAN RX	22
TFT CS	15