AnsweredAssumed Answered

CAN Loopback scoped Tx dead

Question asked by birsan.paul on Nov 12, 2014
Latest reply on Nov 13, 2014 by birsan.paul
Hi! 

   I am using a DevKit407 ( stm32f4 discovery + stm32f4dis-BB). 
       
  1.  I managed to set up a perfectly functioning CAN1 in Loopback mode. I assume I should see the test frame sent on Tx pin (PB9 on stm32f4discovery, or CAN1_TX on BB) with an oscilloscope (sampling rate 2.5 GS/s) . But I do not see any movement. Internally shorting the Tx/Rx pins will close Tx pin?
  2.    
  3. Is there a problem if I use split termination, but the connected devices will have simple 120 Ohm termination? 
Thank you for your time and knowledge! 


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