I want to learn CAN RTR (Remote Transmission Request) basic coding

[Bruno_Hessman_Ramos]

 I've be trying to learn CAN for the past few days for a project using 2 Nucleo F103RB and 2 CAN transceivers. I made a very basic code using normal mode and without using RTR. Now I want to learn how to code using RTR, can someone help me please?

(I already know what is RTR, I want to use it and can't find where to learn it).

[mƎALLEm]

Hello,

Since you know what the RTR is, don't expect to use it to make the receiver to automatically responds the request.

You can send an RTR frame with this parameter:

TxHeader.RTR = CAN_RTR_REMOTE;

On the receive, if you want, to set one of the filters to accept the RTR frames, while received you need to send back a frame manually.

 

[Bruno_Hessman_Ramos]

I am very new on coding and CAN,so can I respond the frame using the button in the Nucleo F103RB?For example,the receiver(RTR)is going to send a request with an ID using TxHeader.StdId = ID right?With this id,the other other board will see the id and send a message,wich the reciver can store right? Thank you for the answer!

[mƎALLEm]

Sorry, I didn't catch the scenario.

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@Bruno_Hessman_Ramos wrote:

the receiver(RTR)is going to send a request with an ID using TxHeader.StdId = ID right?With this id,the other other board will see the id and send a message,wich the reciver can store right? Thank you for the answer!

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The receiver will receive an RTR message with an ID (standard or extended). It will answer by a data message that the sender needs to catch (the filter needs to be configured accordingly in both sides: sender (ID) and the receiver (RTR+ID)).

Hope it's clear now.