PWT buzzer driver: conditionalize on TARGET_HAS_BUZZER Here we add a new target config preprocessor symbol TARGET_HAS_BUZZER, currently defined for c11x and c139; later we also expect to have it on for FC Venus, and in FC Magnetite we are going to turn it on for target dsample, just for the sake of completeness and philosophical correctness.

/*
 * This header file is a FreeCalypso addition: it defines the functional
 * interface to the PWT buzzer driver.
 */

void PWT_block_on(void);
void PWT_block_off(void);
void PWT_play_tone(SYS_UWORD8 note, SYS_UWORD8 volume);
void PWT_stop_tone(void);