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PaulY
Level 1
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Hello,

I have questions about ASCLIN communication in TC36x. 

 

I want to send response to header of master node in slave mode for LIN communication using RX interrupt.

 

I configure to enable interrupt when EVB receives header from masternode by setting FLAGSENABLE.RHE bit.

 

actually the interrupt occurs when the EVB received header, but doesn't happend exactly.

 

I expected to happen interrupt after STOP bit of ID field in header frame, but interrupt is occured before STOP bit. 

 

so now, I implemented to send response function in RX interrupt service routine. Sometimes, It has frame error problem that response frame overlaps the end of header frames (overlaps stopbit of ID field). I checked this situation with a scope. 

 

I don't know what I am missing to configure. I want solution about this problem.

 

thanks.

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1 Solution
PaulY
Level 1
Level 1
5 sign-ins First like received First solution authored

I clear this issue.

 

I configured early sample point position. 

oversampling factor = 15 / sample point position = 3

 -> change sample point position = 8 

View solution in original post

5 Replies
Di_W
Moderator
Moderator
Moderator
500 solutions authored 1000 replies posted 250 solutions authored

Please refer to 36.3.7.3 LIN Slave Sequences in user manual. If any question please feel free to ask.

PaulY
Level 1
Level 1
5 sign-ins First like received First solution authored

Hello dw, thank you for your reply to me


I refered to 36.3.7.2 LIN Master Sequences in user manual. because I want to send response to the latest header. 

Can I use this sequence in RX interrupt service routine? After EVB receives header from master node, It has a RX interrupt and I implement user manual sequence in RX ISR 

but I dont know why response frame overlaps the end of header frame(exactly stopbit of ID Field) that is transmitted by master node.

 

So, I guess that RX interrupt is occured earlier than expected. and than EVB sends response before header frame end (stopbit)

 

PaulY_1-1678695446656.png

 - RX interrupt timing in id field of header frame

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Di_W
Moderator
Moderator
Moderator
500 solutions authored 1000 replies posted 250 solutions authored

Have you checked there is any settings about the delay after Stop Bit? I have not fully examined the part, please read the manual to look up the delay or something else?

PaulY
Level 1
Level 1
5 sign-ins First like received First solution authored

Hello dw, 

I can't find delay parameter in this MCU. and I configure stopbit to 1 cuz LIN communication is neccesary 1 stopbit. 

I will also read more user manual to find about this situation to configure.

 

thank you.

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PaulY
Level 1
Level 1
5 sign-ins First like received First solution authored

I clear this issue.

 

I configured early sample point position. 

oversampling factor = 15 / sample point position = 3

 -> change sample point position = 8