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view src/cs/drivers/drv_app/buzzer/pwt.c @ 291:a72feaed133a

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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.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 26 Mar 2022 19:31:18 +0000
parents 0e5ccb343284
children
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/*
 * This C module is a FreeCalypso addition: it implements hw driver functions
 * for Calypso buzzer output in PWT mode.
 */

#include "main/sys_types.h"
#include "pwt.h"
#include "fc-target.h"

#define	ASIC_CONF_REG	(*(volatile SYS_UWORD16 *) 0xFFFEF008)
#define	PWT_MODE_MASK	0x0020

#define	PWT_FRC_REG	(*(volatile SYS_UWORD8 *) 0xFFFE8800)
#define	PWT_VCR_REG	(*(volatile SYS_UWORD8 *) 0xFFFE8801)
#define	PWT_GCR_REG	(*(volatile SYS_UWORD8 *) 0xFFFE8802)

/* flag tells L1 to suppress deep sleep */
SYS_BOOL PWT_tone_is_on;

void PWT_block_on(void)
{
#ifdef TARGET_HAS_BUZZER
	ASIC_CONF_REG |= PWT_MODE_MASK;
	PWT_GCR_REG = 0x01;
#endif
}

void PWT_block_off(void)
{
#ifdef TARGET_HAS_BUZZER
	ASIC_CONF_REG &= ~PWT_MODE_MASK;
	PWT_GCR_REG = 0;
#endif
}

void PWT_play_tone(SYS_UWORD8 note, SYS_UWORD8 volume)
{
#ifdef TARGET_HAS_BUZZER
	PWT_FRC_REG = note;
	PWT_VCR_REG = (volume << 1) | 1;
	PWT_tone_is_on = 1;
#endif
}

void PWT_stop_tone(void)
{
#ifdef TARGET_HAS_BUZZER
	PWT_VCR_REG = 0;
	PWT_tone_is_on = 0;
#endif
}