General question about main().

Dan S17

In my main() code I have code that reads from a file on my host PC. I also have code that initializes registers on the microcontroller, starts a counter, etc. The code that reads the file is being run on the host PC, obviously. The rest of the code is either being run on the ucon programmer or the ucon itself. My question is: How does the compiler know which code is to be run where? Are separate executables created for the host PC, programmer and ucon? I am just a bit confused.

Dan

over 9 years ago

0 Jean-Marc Mifsud over 9 years ago

TI__Mastermind 22375 points

Dan,

I'm not sure I understand your problem.

What do you mean by:

1] In my main() I have reading a file (running on Host PC)

2] What is "executable for programmer".

3] What Code Generator are you using?

0 Dan S17 over 9 years ago in reply to Jean-Marc Mifsud

Expert 1510 points

Hi Jean-Marc

Sorry for the confusion but it's because I'm confused. In my main() I am reading from a file on the host PC. From this file I read values of ints into an array stored on the microcontroller. I guess I am confused about how this read is being done. Does the microcontroller execute the read? If so then how does the microcontroller know anything about the host file system? So what I need is an explanation of how this read is being done.

Dan

0 Jean-Marc Mifsud over 9 years ago in reply to Dan S17

TI__Mastermind 22375 points

Dan,

Can you share the code you are using?

I assume you are using function like fopen, fread, fclose?

If so, this will only work during debug and will not work once your micro is not connected via JTAG to Code Composer Studio.

Please confirm.

0 Dan S17 over 9 years ago in reply to Jean-Marc Mifsud

Expert 1510 points

Hi Jean-Marc

Yes I am using fopen, fread, fclose and the code is typical. The code also works just fine. I am simply trying to understand how this works - which machine is doing what and when. Any help is appreciated this part of code is a bit of a black box to me presently.

Dan

0 Chester Gillon over 9 years ago in reply to Dan S17

Guru 92251 points

Dan S17 said:
The code also works just fine. I am simply trying to understand how this works - which machine is doing what and when.

File I/O when running under the CCS debugger is handled by CIO (C I/O). See the following Wiki pages for information about how CIO works:

http://processors.wiki.ti.com/index.php/How_Do_Breakpoints_Work#The_CIO_Breakpoint

http://processors.wiki.ti.com/index.php/CIO_System_Call_Protocol

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General question about main().