Datasheet

The C and C++ Libraries

4.7.7 _ttywrch()

This function writes a character to the console. The console might have been redirected.

You can use this function as a last resort error handling routine.

Syntax

void _ttywrch(int ch)

Implementation

The default implementation of this function uses the semihostingSWI.

You can redefine this function, or

__raise()

, even if there is no other input/output. For

example, it might write an error message to a log kept in nonvolatile memory.

4.7.8 __rt_fp_status_addr()

This function returns the address of the floating-point status register.

Syntax

unsigned* _rt_fp_status_addr(void)

Implementation

__rt_fp_status_addr()

is not defined,the default implementation from the C library

is used. The value is initialized when

__rt_lib_init()

calls

_fp_init()

. The constants

for the status word are listed in

fenv.h

. The default fp status is 0.