FreeCalypso > hg > fc-tourmaline

comparison src/cs/drivers/drv_app/buzzer/pwt.c @ 290:0e5ccb343284

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implement PWT buzzer driver The piece implemented here is the low-level driver component; there will also be a higher-level buzzer melody player service, to be implemented in RiViera land, that will be the sole caller of PWT API functions provided by the present driver.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 26 Mar 2022 18:23:50 +0000
parents
children a72feaed133a
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289:4d203ef0eb4b 290:0e5ccb343284
1 /*
2 * This C module is a FreeCalypso addition: it implements hw driver functions
3 * for Calypso buzzer output in PWT mode.
4 */
5
6 #include "main/sys_types.h"
7 #include "pwt.h"
8
9 #define ASIC_CONF_REG (*(volatile SYS_UWORD16 *) 0xFFFEF008)
10 #define PWT_MODE_MASK 0x0020
11
12 #define PWT_FRC_REG (*(volatile SYS_UWORD8 *) 0xFFFE8800)
13 #define PWT_VCR_REG (*(volatile SYS_UWORD8 *) 0xFFFE8801)
14 #define PWT_GCR_REG (*(volatile SYS_UWORD8 *) 0xFFFE8802)
15
16 /* flag tells L1 to suppress deep sleep */
17 SYS_BOOL PWT_tone_is_on;
18
19 void PWT_block_on(void)
20 {
21 ASIC_CONF_REG |= PWT_MODE_MASK;
22 PWT_GCR_REG = 0x01;
23 }
24
25 void PWT_block_off(void)
26 {
27 ASIC_CONF_REG &= ~PWT_MODE_MASK;
28 PWT_GCR_REG = 0;
29 }
30
31 void PWT_play_tone(SYS_UWORD8 note, SYS_UWORD8 volume)
32 {
33 PWT_FRC_REG = note;
34 PWT_VCR_REG = (volume << 1) | 1;
35 PWT_tone_is_on = 1;
36 }
37
38 void PWT_stop_tone(void)
39 {
40 PWT_VCR_REG = 0;
41 PWT_tone_is_on = 0;
42 }