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teachop / FlexCAN_Library

Arduino library for CAN on Teensy 3.1
The Unlicense
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ReadMe.md Lines 6 & 14 Connecting Teensy to Transceiver #29

Open CNCQuilter opened 6 years ago

CNCQuilter commented 6 years ago

Line 6 & 14 of the Updated_ReadMe.md file seem to contain conflicting information regarding connecting a Teensy to a CAN Transceiver.

Should the TX and RX Teensy pins be connected to the Transceiver TXD & RXD pins respectively (line 6) or just the reverse (line 14)?

tonton81 commented 5 years ago

TX to TX, RX to RX. Just like UART, you won't blow up anything if they're backwards, it just won't work.

pawelsky commented 5 years ago

Well, actually that answer (especially the "just like UART" part) may make things even more confusingas with UART you usually connect TX to RX and vice versa.

In case of the CAN transceiver the situation is a bit different mainly due to different (and a bit confusing) naming convention used. Transciever's TXD is a Transmit Data Input (so actually a receive pin) while RXD is Receive Data Output (so actually a transmit pin).

That is the reason why one should connect Teensy's TX pin with transciever's TXD pin and RX with RXD.