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FS#10317 - Sansa AMS 32-bit timers. Configure the timers for 32-bit mode instead of the default 16-bit mode.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21266 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2009-06-12 21:11:45 +00:00
parent 9d2208e806
commit d1faf8b39c
2 changed files with 16 additions and 30 deletions
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20
firmware/target/arm/as3525/kernel-as3525.c
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@ -61,26 +61,18 @@ void INT_TIMER2(void)
void tick_start(unsigned int interval_in_ms)
{
int phi = 0; /* prescaler bits */
int prescale = 1;
int cycles = KERNEL_TIMER_FREQ / 1000 * interval_in_ms;
while(cycles > 0x10000)
{
phi++;
prescale <<= 4;
cycles >>= 4;
}
if(prescale > 256)
panicf("%s : interval too big", __func__);
CGU_PERI |= CGU_TIMER2_CLOCK_ENABLE; /* enable peripheral */
VIC_INT_ENABLE |= INTERRUPT_TIMER2; /* enable interrupt */
TIMER2_LOAD = TIMER2_BGLOAD = cycles; /* timer period */
/* /!\ bit 4 (reserved) must not be modified
* periodic mode, interrupt enabled, 16 bits counter */
TIMER2_CONTROL = (TIMER2_CONTROL & (1<<4)) | 0xe0 | (phi<<2);
* periodic mode, interrupt enabled, no prescale, 32 bits counter */
TIMER2_CONTROL = (TIMER2_CONTROL & (1<<4)) |
TIMER_ENABLE |
TIMER_PERIODIC |
TIMER_INT_ENABLE |
TIMER_32_BIT;
}