I'll have a go at this, though I'm sure Grant or Steve will also throw
in on the matter with much more authoritative answers.
printf relies on putchar to actually write the character string out to
the UART. printf doesn't know which UART you want it to be directed to,
so it just directly reference putchar and expects you to provide putchar
to output them.
If you've setup a simple polled serial port driver then it should be as
simple as having
void putchar(int c)
{ uart_tx(c);
}
or something like that. I can't remember if putchar is defined with an
int argument or just a char. Experimentation would tell you
As for sqrt, are you linking in the math library? -lm
The same might apply to sin, though I might actually be wrong on both of
these.
I believe the math functions also require you to compile against the
math header file math.h..
Bevan
Hi,
I keep getting these error messages: "undefined reference to ...."
When I try to use printf, it's undefined reference to putchar.
When I use sqrt, it's undefined reference to sqrt.
When I use sin, it's undefined reference to r2dintcall (???).
Is there a solution, or is this normal? (can't imagine it to be)
Thanks,
Oszkar
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