unix/mphalport.h: Add warning of mp_hal_delay_ms() implementation.
It's implemented in terms of usleep(), and POSIX doesn't guarantee that usleep() can sleep for more than a second. This restriction unlikely applies to any real-world system, but...
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@ -34,6 +34,8 @@ void mp_hal_set_interrupt_char(char c);
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void mp_hal_stdio_mode_raw(void);
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void mp_hal_stdio_mode_orig(void);
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// TODO: POSIX et al. define usleep() as guaranteedly capable only of 1s sleep:
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// "The useconds argument shall be less than one million."
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static inline void mp_hal_delay_ms(mp_uint_t ms) { usleep((ms) * 1000); }
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static inline void mp_hal_delay_us(mp_uint_t us) { usleep(us); }
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