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Some peripherals have their clocks automatically gated in PM1+ modes, so they cannot operate. This new mechanism gives peripherals a way to prohibit PM1+ modes so that they can properly complete their current operations before entering PM1+. This mechanism is implemented with peripheral functions registered to the LPM module. These functions return whether the associated peripheral permits or not PM1+ modes. They are called by the LPM module each time PM1+ might be possible. If any of the peripherals wants to block PM1+, then the system is only dropped to PM0. Partly from: George Oikonomou Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: