The version of the reference VI currently being shipped by Ford (in limited
quantity) has v0.3 of the PCB, and there are no known electrical issues.
For greater detail, see the changelog in the source
- No known electrical issues.
This was the first test run of the schematic.
- Output Power Jack Polarity is incorrect - The output power jack should be
configured such that Pin 1 (the keyed pin) is Ground, and Pin 2 is +12V. This
is flipped on the R0.2 PCB. A custom cable was created to patch this issue,
and is labeled
R0.2 Only. Only use this cable with R0.2 prototypes,
otherwise the KBoard TVS Diode D2 and/or the VI power switch IC7
may be damaged or destroyed.
- JTAG CLK line - the JTAG signal RTCK was disconnected on R0.2 boards. It has
manually been replaced with a wire. Occasionally the additional capacitance of
this wire can cause JTAG errors - try reducing the JTAG clock rate.
- JTAG Ground noise - Occasionally JTAG errors can be caused by a ground loop
between a USB JTAG adapter and the MicroUSB port on the VI. Try
removing one or more connections to ground: IE, try powering the prototype
from ONLY +5V USB verses the +12V OBD-II supply.
- Bluetooth connection dropout - Under some circumstances, the RN-41 bluetooth
chipset will lock up and drop an active bluetooth connetion when under heavy
- The most common cause of this problem is software flow control: make sure
to use the RTS and CTS pins for UART1.
- The RN-41 configuration timer can also cause the RN-41 input buffer to
fill. From the LPC1769, enter configuration mode by transmitting
$$$, disable the configuration timer with
ST,0\r\n and then
exit configuration mode by entering
---\r\n. Finally, power cycle
the VI. The test firmware
rn42-passthrough enables serial
data to be relayed between UART0 (the 6-pin ISP header) and UART1 (the