len0rd/rockbox
1
0
Fork 1
mirror of https://github.com/Rockbox/rockbox.git synced 2025-12-08 12:45:26 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

iPod Classic: configure piezo GPIO ports

Browse source 
Configures piezo GPIO ports for the lowest power consumption
when not in use.

Change-Id: If80b0c947f197277972fd9319b8ab283cca96d3c
This commit is contained in:
Cástor Muñoz 2014-12-01 03:47:41 +01:00
parent bfb63f8017
commit 9454ad4c97
1 changed files with 11 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

20
firmware/target/arm/s5l8702/ipod6g/piezo-ipod6g.c
View file

@ -31,10 +31,7 @@ void INT_TIMERA(void)
/* clear interrupt */
TACON = TACON;
if (!(--duration))
{
beeping = 0;
TACMD = (1 << 1); /* TA_CLR */
}
piezo_stop();
}
static void piezo_start(unsigned short cycles, unsigned short periods)
@ -42,14 +39,16 @@ static void piezo_start(unsigned short cycles, unsigned short periods)
#ifndef SIMULATOR
duration = periods;
beeping = 1;
/* configure timer for 100 kHz */
/* select TA_OUT function on GPIO ports */
PCON0 = (PCON0 & 0x00ffffff) | 0x53000000;
/* configure timer for 100 kHz (12 MHz / 4 / 30) */
TACMD = (1 << 1); /* TA_CLR */
TAPRE = 30 - 1; /* prescaler */ /* 12 MHz / 4 / 30 = 100 kHz */
TAPRE = 30 - 1; /* prescaler */
TACON = (1 << 13) | /* TA_INT1_EN */
(0 << 12) | /* TA_INT0_EN */
(0 << 11) | /* TA_START */
(1 << 8) | /* TA_CS = PCLK / 4 */
(1 << 6) | /* UNKNOWN bit */ /* external 12 MHz clock ??? */
(1 << 8) | /* TA_CS = ECLK / 4 */
(1 << 6) | /* select ECLK (12 MHz) */
(1 << 4); /* TA_MODE_SEL = PWM mode */
TADATA0 = cycles; /* set interval period */
TADATA1 = cycles << 1; /* set interval period */
@ -60,7 +59,10 @@ static void piezo_start(unsigned short cycles, unsigned short periods)
void piezo_stop(void)
{
#ifndef SIMULATOR
beeping = 0;
TACMD = (1 << 1); /* TA_CLR */
/* configure GPIO for the lowest power consumption */
PCON0 = (PCON0 & 0x00ffffff) | 0xee000000;
#endif
}
@ -76,7 +78,7 @@ bool piezo_busy(void)
void piezo_init(void)
{
beeping = 0;
piezo_stop();
}
void piezo_button_beep(bool beep, bool force)