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FreeRTOS Support ArchiveThe FreeRTOS support forum is used to obtain active support directly from Real Time Engineers Ltd. In return for using our top quality software and services for free, we request you play fair and do your bit to help others too! Sign up to receive notifications of new support topics then help where you can.
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Low Power Support For ARM Cortex-MPosted by jiangtianyu007 on July 21, 2015 In freertosv8.2.1freertossourceportableiararmcm3, I have a question about the __weak void vPortSuppressTicksAndSleep( TickTypet xExpectedIdleTime ) function. line 408: /* Enter a critical section but don't use the taskENTERCRITICAL() method as that will mask interrupts that should exit sleep mode. */ __disableinterrupt(); vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime ) means disable other interrupt except for systick, and use systick to wake up mcu from sleep mode. but in my opinion, _disableinterrupt() is IAR intrinsic function, and equal with cpsid i. It means any interrupt which priority below 0(logically) will be disabled. So how can systick wake MCU up? Low Power Support For ARM Cortex-MPosted by rtel on July 21, 2015 This information is provided in the Cortex-M technical reference manual, from ARM, so is not really a software question - however the answer is that interrupts will still bring the CPU out of sleep mode even when they are globally disabled in the core. Low Power Support For ARM Cortex-MPosted by jiangtianyu007 on July 21, 2015 Is your mean that even the systick interrupt is masked, systick also will wake MCU up ? If so, the system will not enter the systick handler, just only bring CPU out of sleep mode. Is it right? Low Power Support For ARM Cortex-MPosted by rtel on July 21, 2015 Yes. Please read the hardware documentation. Low Power Support For ARM Cortex-MPosted by jiangtianyu007 on July 22, 2015 Thanks very much.
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