30 Dec '11, 1pm

Take advantage of the #ARM Cortex-M3’s pre-emptive context switches | Virtual Prototype critical

Take advantage of the #ARM Cortex-M3’s pre-emptive context switches | Virtual Prototype critical

Essentially, the SysTick interrupt enables round-robin style scheduling while the PendSV supports FIFO style. The stack pointers for the CM3 include the main stack pointer (MSP) and the process stack pointer (PSP). The MSP is always used when in handler mode (when an interrupt is being serviced) and can optionally be used during regular program execution. The PSP is limited to use during regular program execution. This gives the system designer several options. The ARM Cortex-M3 technical reference manual suggests one configuration:

Full article: http://www.eetimes.com/design/embedded/4231326/Taking-adv...

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electronicdesign.com 29 Dec '11, 3am

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Times Square ball-drop switches to LEDs

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grist.org 30 Dec '11, 2pm

Despite Republicans' efforts to equate efficient lighting with tyranny, the age of incandescent bulbs will be officially o...