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CAN Node not able to transmit when on an existing bus

Question asked by Mohit Aggarwal on May 25, 2018
Latest reply on May 30, 2018 by Mohit Aggarwal

Hello Everyone,


I,am having a issue with my can node.


The communication bw two can nodes built on STM32L4 works perfectly fine. But that's just for testing purpose. I don't intend to use it that way.


When I introduce it to an existing CAN bus, TX stops. Node is able to read the messages on the bus.


Please let me know what all things i can try or i might be missing.


Hope someone has already been down this road and can help me out..


CAN settings are as follow


hcan1.Instance = CAN1;
hcan1.Init.Prescaler = 6;
hcan1.Init.Mode = CAN_MODE_NORMAL;
hcan1.Init.SyncJumpWidth = CAN_SJW_1TQ;
hcan1.Init.TimeSeg1 = CAN_BS1_13TQ;
hcan1.Init.TimeSeg2 = CAN_BS2_2TQ;
hcan1.Init.TimeTriggeredMode = DISABLE;
hcan1.Init.AutoBusOff = DISABLE;
hcan1.Init.AutoWakeUp = DISABLE;
hcan1.Init.AutoRetransmission = ENABLE;
hcan1.Init.ReceiveFifoLocked = DISABLE;
hcan1.Init.TransmitFifoPriority = DISABLE;