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* avr: Do not use Idle modeKevin O'Connor2018-04-281-1/+1
| | | | | | | | | | | | 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>
* irq: Support sleeping when mcu is idleKevin O'Connor2017-07-171-0/+4
| | | | Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* irq: Add an irq_poll() stub for board codeKevin O'Connor2017-05-151-0/+3
| | | | | | | Allow the board specific code to run checks prior to running each task. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* irq: Allow boards to define the return type of irq_save()Kevin O'Connor2016-06-131-2/+4
| | | | | | | | The AVR wants a uint8_t return type for irq_save(), but other architectures will generally prefer int. Allow the board to configure the size of the flag by introducing an irqstatus_t typedef. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
* Initial commit of source code.Kevin O'Connor2016-05-251-0/+29
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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