Ford Reference Vehicle interface¶
The Ford Reference VI is an open source hardware implementation of a VI, and the complete documentation is available at vi.openxcplatform.com.
To build for the Ford reference VI, compile with the flag
Flashing a Pre-compiled Firmware¶
Pre-compiled binaries (built with the
BOOTLOADER flag enabled, see all
compiler flags) are compatible with the OpenLPC USB bootloader - follow the instructions
for Flashing User Code to
update the vehicle interface.
If you are running a supported bootloader, you don’t need any special programming hardware. Compile the firmware to run under the bootloader:
$ fab reference build
The compiled firmware will be located at
build/lpc17xx/vi-firmware-lpc17xx.bin. See reference VI programming
find out how to re-flash the VI.
Attach a JTAG adapter to your computer and the VI, then compile and flash:
$ export PLATFORM=FORDBOARD $ export BOOTLOADER=0 $ make clean $ make -j4 $ make flash
The config files in this repository assume your JTAG adapter is the
Olimex ARM-USB-OCD unit. If you have a different unit, modify the
src/lpc17xx/lpc17xx.mk Makefile to load your programmer’s OpenOCD
The software configuration is identical to the Blueboard. The reference VI includes an RN-41 on the PCB attached to the RX, TX, CTS and RTS pins, in addition to the UART status pin.
When a Bluetooth host pairs with the RN-42 and opens an RFCOMM connection, pin 0.18 will be pulled high and the VI will being streaming vehicle data over UART.
In most cases the logging provided via USB is sufficient, but if you are doing
low-level development and need the simpler UART interface, you can enable it
DEFAULT_LOGGING_OUTPUT="UART" build option.
Logging will be on UART0, which is exposed on the bottom of the board at J3, a 5-pin ISP connector.
The reference VI has 2 RGB LEDs. If the LEDs are a dim green and red, then the firmware was not flashed properly and the board is not running.
- CAN activity detected - Blue
- No CAN activity on either bus - Orange
- USB connected, Bluetooth not connected - Green
- Bluetooth connected, USB in either state - Blue
- Neither USB or Bluetooth connected - Off
The OpenLPC USB bootloader is tested and working, and enables the LPC17xx to appear as a USB drive. See the documentation in that repository for instructions on how to flash the bootloader (a JTAG programmer is required). The reference VI from Ford is pre-programmed with this bootloader.