printf compiles into something bizarre

seandonohue — Fri, 31 Jan 2014 17:07:00 GMT

I'm trying to add printf functionality on LINFlex_1 on an MPC5675K. I have written the stub functions InitializeUART, ReadUARTN, and WriteUARTN, but these are never called. No warnings or errors either. When I look at what is compiled from the EWL C library, it makes no sense to me. This is the program flow after calling printf("rbInit"):

printformat.c

line 114 __pformatter

line 95 {

line 113 va_start

line 114 __pformatter

line 113 va_start

line 114 __pformatter

line 113 va_start

line 114 __pformatter

line 1906 {

runtime.c

__create_frame_and_save_gpr_21

printformat.c

line 2138 num_chars = ...

line 1932 chars_written = 0

line 2377 *buff_ptr = '%'

line 1934 while(*format_ptr) {

line 2479 return (chars_written)

runtime.c

__restore_gpr_21_exit

And finally back to main. num_chars is never updated, buffers seem to be filled with all 0's, and many lines of code are just never executed or compiled. What is going on here?

Re: printf compiles into something bizarre

seandonohue — Fri, 31 Jan 2014 20:09:55 GMT

Nevermind. Didn't copy the ROM sections containing the print strings to RAM.

topic Re: printf compiles into something bizarre in CodeWarrior for MCU

printf compiles into something bizarre

Re: printf compiles into something bizarre