[avr-libc-dev] [patch #6418] Yet another delay routines

[Timothy Baldwin]

Follow-up Comment #3, patch #6418 (project avr-libc):

Rather than generating an error when an integer non-constant is passed the
non-exact macros could form a loop around a constant delay.


#define _delay_ms(__ms)                                                     

do {                                                                        

    if (!__builtin_constant_p(F_CPU)) {                                     

        _DELAY_EMIT_ERROR(__STRINGIFY(F_CPU)                                

                          " is not a constant for _delay_ms");              

    } else if (__builtin_constant_p(__ms)) {                                

        _delay_f_ms(F_CPU, __ms);                                           

    } else if ((__typeof__((_ms) + 0))0.25 == 0)  {                         

        __typeof__((__ms) + 0) __ms2 = __ms;                                

        while (__ms2--) _delay_f_ms(F_CPU, 1);                              

    } else {                                                                

        _DELAY_EMIT_ERROR(__STRINGIFY(__ms)                                 

                          " is not a constant or integer for _delay_ms");   

    }                                                                       

} while (0)



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