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tmu: safer restore order

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The previous setup made it possible for TCNT to underflow to an
uncontroller value of TCOR during the restore.
This commit is contained in:
Lephe 2020-07-08 19:49:09 +02:00
parent e2886d2bd7
commit 03715344a4
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GPG key ID: 1BBA026E13FC0495
1 changed files with 7 additions and 5 deletions
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12
src/tmu/tmu.c
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@ -335,12 +335,12 @@ static void init(void)
/* Clear every timer to avoid surprises */
for(int id = 0; id < 3; id++)
{
TMU[id].TCOR = 0xffffffff;
TMU[id].TCNT = 0xffffffff;
do TMU[id].TCR.word = 0;
while(TMU[id].TCR.word);
TMU[id].TCOR = 0xffffffff;
TMU[id].TCNT = 0xffffffff;
/* Standard timers: TCR is provided to the interrupt handler */
timers[id]->TCR = &TMU[id].TCR;
}
@ -455,13 +455,13 @@ static void ctx_save(void *buf)
static void ctx_restore(void *buf)
{
ctx_t *ctx = buf;
*TSTR = ctx->TSTR;
*TSTR = 0;
for(int i = 0; i < 3; i++)
{
tmu_t *c = &ctx->std[i];
TMU[i].TCNT = c->TCNT;
TMU[i].TCOR = c->TCOR;
TMU[i].TCNT = c->TCNT;
TMU[i].TCR.word = c->TCR.word;
}
for(int i = 0; i < timer_count() - 3; i++)
@ -480,6 +480,8 @@ static void ctx_restore(void *buf)
do T->TCR.byte = c->TCR.byte;
while(T->TCR.byte != c->TCR.byte);
}
*TSTR = ctx->TSTR;
}
//---