This Arduino library allows the user to receive and send messages on Chrysler's PCI-bus.
It uses interrupts to decode and encode J1850 VPW protocol.
Only Uno and Mega boards are supported.

RX-pin must be external interrupt capable:

• Arduino Uno: 2 or 3
• Arduino Mega: 2, 3, 18, 19, 20 or 21 (pins 71 and 72 are not broken out to the connector)

TX-pin can be any unused pin.

Message reception and transmission are handled simultaneously.

Bus-idle condition is measured with Timer 2 (Uno/Mega).
The protocol encoder uses Timer 1 (Uno) or Timer 4 (Mega) to signal TX pin state changes in accordance with J1850 VPW timing requirements.
Make sure that these timers are not used by other functions.

Without a suitable transceiver circuit/chip and live PCI-bus network the library is easy to test with the loop-back method: short selected RX/TX pins, upload J1850VPWWrite example, open Arduino Serial Monitor and observe the repeated test message.

To be used with the CCD/PCI-bus Transceiver Development Boards.