topic Re: Problem when I try to receive a message through CAN in S32K

Problem when I try to receive a message through CAN

JonAnder_Amante — Wed, 22 May 2024 09:03:57 GMT

Hi,

I have a problem when I try to receive a message through CAN. I want to check if I receive a data in S32 Design Studio, so I send the functions that I have used (The clock of CAN is 24 MHz and It is correct). I have different problems.

1. When I try to receive the messages, the dates are 0.

2. I don´t know if I want to implement 0x because the dates I want to send are in the PCAN-View (In hexadecimal the dates are 11 22 34 44 (I only want to check if the first date is 11)

In the next pictures you can see the functions that I have used.

In summary, the target of this program is the implementation of bootloader. The problem is that I want to check if the jump to the application is made depending on a CAN message is received. (The application is a program which send and receive different dates).

In the main I have these functions and structures:

I have tried instead of "g_RXCANMsg" instead of implement "rxData" but I havce problem because the program said that the variable "g_RXCANMsg" doesn´t definied, so Could you tell me the steps to implement this varibale?

Thank you for all,

Re: Problem when I try to receive a message through CAN

PetrS — Wed, 22 May 2024 11:01:01 GMT

Hi,

hard to suggest from given code snippets.
If you see issues with project building, you need to find root cause yourself.
1) When you call Flexcan_Ip_Receive with pointing to "g_RXCANMsg", then after successful reception you will get callback function and "g_RXCANMsg" contains message content you sent from PCAN tool.
2) In PCAN tool you put hex values, so in your code, so first byte is 0x11, then you should test for 0x11, not 0x17 you have

BR, Petr

Re: Problem when I try to receive a message through CAN

JonAnder_Amante — Fri, 24 May 2024 07:13:59 GMT

Hi,

Thank you for your information but I have different questions. I want to use the variable "g_RXCANMsg" and the definition of this variable is on the "main.c" and I want to use this variable in the file "boot_Cfg.c". I think that the structure "FlexCAN_Ip_MsgBuffType" is important but i don´t know what commands I have to implement in the file "Boot_Cfg.c" to use this varibale in the file "boot_Cfg.c". I send you different picture to understand the problem because I can´t compile the project because of this problem.

I hope your answer as soon as possible.

Thank you

Re: Problem when I try to receive a message through CAN

PetrS — Fri, 24 May 2024 10:44:58 GMT

Hi,

try to use extern FlexCAN_Ip_MsgBuffType g_RXCANMsg; in your c file.

BR, Petr

Re: Problem when I try to receive a message through CAN

JonAnder_Amante — Fri, 24 May 2024 11:46:15 GMT

Hi,

I have tried your idea and I have an error. The error said that there are multiple definition of g_RXCANMsg and I don´t know how I can solve the problem. Could you tell me the steps to solve it?

Thank you for all,

Re: Problem when I try to receive a message through CAN

PetrS — Fri, 24 May 2024 12:37:54 GMT

Hi,

I do not see you have extern keyword used.

BR, Petr

Re: Problem when I try to receive a message through CAN

JonAnder_Amante — Mon, 27 May 2024 06:02:23 GMT

Hi,

I don´t understand you when you tell me that I have to use a extern keyword. Could you tell me steps to implement this? I undestood that I have to add the command "FlexCAN_Ip_MsgBuffType g_RXCANMsg;" but I haven´t achieved nothing.

Thank you for all,

Re: Problem when I try to receive a message through CAN

PetrS — Mon, 27 May 2024 09:51:20 GMT

Hi,

read e.g. https://stackoverflow.com/questions/1433204/how-do-i-use-extern-to-share-variables-between-source-files

BR, Petr

Re: Problem when I try to receive a message through CAN

JonAnder_Amante — Tue, 28 May 2024 07:23:19 GMT

Hi,

I keep having problems. The target is that bootloader achieves to do "Request Backdoor", in the project I have implemented it with a button but I want to receive a message and then jump to the application. I want to use a variable called "g_RXCANMsg" which is in the "main.c" and I want to use in the file "Boot_Cfg.c". Could you send the command that I have to implement and where I have to use the command? I have read the link that I send me but I haven´t achieved any solution.

Thank you for all,

Re: Problem when I try to receive a message through CAN

JonAnder_Amante — Thu, 30 May 2024 09:51:34 GMT

Hi,

I have achieved implement the variables with "extern" but I don´t achieve to receive any value through CAN. Could you tell me the command that I have to use, I think that I have to use the command "Receive"

Thank you

Re: Problem when I try to receive a message through CAN

PetrS — Fri, 31 May 2024 09:58:32 GMT

Hi,

you should have MB prepared for reception using ConfigRxMb function then start receving by Receive function.

BR, Petr