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cpu/kinetis_common: periph/timer, read PIT value before stopping

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Reading CVAL after stopping timer seem to return zero.
Ref. manual states: "The counter period can be restarted, by first
disabling, and then enabling the timer with TCTRLn[TEN]", but does not
state whether the reset of CVAL happens on TEN 0->1 transition, or 1->0
transtion. Empirical evidence suggests the latter is the implemented behaviour.
This commit is contained in:
Joakim Gebart 2015-08-13 20:59:26 +02:00
parent 77ca7a50bc
commit cf5db434e6
1 changed files with 2 additions and 2 deletions
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4
cpu/kinetis_common/timer.c
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@ -149,8 +149,8 @@ int timer_set_absolute(tim_t dev, int channel, unsigned int value)
#if TIMER_0_EN
case TIMER_0:
pit_timer_stop(TIMER_0_COUNTER_CH);
cu_timer[dev].counter32b = pit_timer_read(dev, TIMER_0_COUNTER_CH);
pit_timer_stop(TIMER_0_COUNTER_CH);
cu_timer[dev].diff = value - cu_timer[dev].counter32b;
TIMER_DEV->CHANNEL[TIMER_0_COUNTER_CH].LDVAL = cu_timer[dev].diff;
pit_timer_start(TIMER_0_COUNTER_CH);
@ -159,8 +159,8 @@ int timer_set_absolute(tim_t dev, int channel, unsigned int value)
#if TIMER_1_EN
case TIMER_1:
pit_timer_stop(TIMER_1_COUNTER_CH);
cu_timer[dev].counter32b = pit_timer_read(dev, TIMER_1_COUNTER_CH);
pit_timer_stop(TIMER_1_COUNTER_CH);
cu_timer[dev].diff = value - cu_timer[dev].counter32b;
TIMER_DEV->CHANNEL[TIMER_1_COUNTER_CH].LDVAL = cu_timer[dev].diff;
pit_timer_start(TIMER_1_COUNTER_CH);