-char
-ao_serial1_getchar(void);
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-void
-ao_serial1_putchar(char c);
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-char
-ao_serial1_pollchar(void);
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-void
-ao_serial1_set_speed(uint8_t speed);
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-char
-ao_serial2_getchar(void);
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-void
-ao_serial2_putchar(char c);
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-char
-ao_serial2_pollchar(void);
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-void
-ao_serial2_set_speed(uint8_t speed);
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-char
-ao_serial3_getchar(void);
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-void
-ao_serial3_putchar(char c);
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-char
-ao_serial3_pollchar(void);
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-void
-ao_serial3_set_speed(uint8_t speed);
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