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Gigabeat S: Implement a genuine udelay function. Timer is gated to not run in WFI mode to save power and as such time until rollover is variable.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19820 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2009-01-23 01:23:25 +00:00
parent da76a34694
commit 7bcfc38b42
4 changed files with 123 additions and 19 deletions
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17
firmware/target/arm/imx31/gigabeat-s/system-target.h
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@ -31,25 +31,18 @@
#define CPUFREQ_MAX CPU_FREQ
#endif
/* For USB driver - no accuracy assurance */
static inline void udelay(unsigned int usecs)
{
unsigned int x;
for (x = 0; x < 300*usecs; x++)
asm volatile ("");
unsigned stop = GPTCNT + usecs;
while (TIME_BEFORE(GPTCNT, stop));
}
#if 0
static inline void udelay(unsigned int usecs)
{
volatile signed int stop = EPITCNT1 - usecs;
while ((signed int)EPITCNT1 > stop);
}
#endif
void watchdog_init(unsigned int half_seconds);
void watchdog_service(void);
void gpt_start(void);
void gpt_stop(void);
/* Prepare for transition to firmware */
void system_prepare_fw_start(void);
void tick_stop(void);