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| author | Kevin O'Connor <kevin@koconnor.net> | 2018-04-28 20:04:32 -0400 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2018-04-28 21:26:42 -0400 |
| commit | 4a8f9407b8148d017af567ce41f0d42aecbe9b05 (patch) | |
| tree | e09b85c7bb3c5a05af6873c6b7ac2141c9850fd2 /src/avr/irq.h | |
| parent | 46cf3ef1457d0ea63dc30ecd3f343af83e03b589 (diff) | |
| download | kutter-4a8f9407b8148d017af567ce41f0d42aecbe9b05.tar.gz kutter-4a8f9407b8148d017af567ce41f0d42aecbe9b05.tar.xz kutter-4a8f9407b8148d017af567ce41f0d42aecbe9b05.zip | |
avr: Do not use Idle mode
The AVR chips (bizarrely) start an ADC conversion when entering Idle
mode. This behavior can cause the ADC to be busy when a sample is
required. Worse, if a series of events cause the cpu to enter and
leave Idle mode with a timing similar to the ADC checking rate then it
can cause the ADC to show as busy for extended periods. This could
cause high MCU load and possibly lead to a "Rescheduled timer in the
past" shutdown.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Diffstat (limited to 'src/avr/irq.h')
| -rw-r--r-- | src/avr/irq.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/avr/irq.h b/src/avr/irq.h index 349c4c43..63a1018b 100644 --- a/src/avr/irq.h +++ b/src/avr/irq.h @@ -29,7 +29,7 @@ static inline void irq_restore(irqstatus_t flag) { } static inline void irq_wait(void) { - asm("sei\n sleep\n cli" : : : "memory"); + asm("sei\n nop\n cli" : : : "memory"); } static inline void irq_poll(void) { |