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As recommended by the CC2538 User's Guide, set SYS_CTRL_CLOCK_CTRL.OSC_PD to 0 before asserting WFI, and set it to 1 after the system clock is sourced from the 32-MHz XOSC following wake-up. This allows to automatically start both oscillators upon wake-up in order to partially hide the 32-MHz XOSC startup time by the 16-MHz RCOSC startup time. 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: