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iPod Classic: minor modifications in TIMER

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The current behaviour should not change.

Change-Id: Ia8f44cdccf41dbc3881722f9aebab91de51a9bc5
This commit is contained in:
Cástor Muñoz 2014-12-01 02:33:41 +01:00
parent 8618f2c227
commit bfb63f8017
3 changed files with 24 additions and 23 deletions
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11
firmware/target/arm/s5l8702/kernel-s5l8702.c
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@ -39,19 +39,16 @@ void tick_start(unsigned int interval_in_ms)
{
int cycles = 10 * interval_in_ms;
/* configure timer for 10 kHz (external source) */
/* configure timer for 10 kHz (12 MHz / 16 / 75) */
TBCMD = (1 << 1); /* TB_CLR */
TBPRE = 75 - 1; /* prescaler */ /* 12 MHz / 16 / 75 = 10 KHz */
TBPRE = 75 - 1; /* prescaler */
TBCON = (0 << 13) | /* TB_INT1_EN */
(1 << 12) | /* TB_INT0_EN */
(0 << 11) | /* TB_START */
(2 << 8) | /* TB_CS = PCLK / 16 */
(1 << 6) | /* UNKNOWN bit */ /* external 12 MHz clock (?) */
(2 << 8) | /* TB_CS = ECLK / 16 */
(1 << 6) | /* select ECLK (12 MHz) */
(0 << 4); /* TB_MODE_SEL = interval mode */
TBDATA0 = cycles; /* set interval period */
TBCMD = (1 << 0); /* TB_EN */
/* enable timer interrupt */
VIC0INTENABLE = 1 << IRQ_TIMER;
}