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Fix bug in udelay(): incorrect CPU_KHZ multiply factor.

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This commit is contained in:
Serge Vakulenko
2015-10-08 12:30:34 -07:00
parent 793e6052bd
commit f7d93551cb
1 changed files with 4 additions and 1 deletions
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5
sys/pic32/machdep.c
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@@ -671,13 +671,16 @@ boot(dev, howto)
/*
* Microsecond delay routine for MIPS processor.
*
* We rely on a hardware register Count, which is increased
* every next clock cycle, i.e. at rate CPU_KHZ/2 per millisecond.
*/
void
udelay(usec)
u_int usec;
{
unsigned now = mips_read_c0_register(C0_COUNT, 0);
unsigned final = now + usec * (CPU_KHZ / 1000);
unsigned final = now + usec * (CPU_KHZ / 1000) / 2;
for (;;) {
now = mips_read_c0_register(C0_COUNT, 0);