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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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Privilege modePosted by jmmifsud on September 2, 2014 Hi, I'm running FreeRtos on a Texas-Instruments RM48 (Cortex R4 core). When I try using the xTimer function, it is only working when the xTimer functions are called from main() before the vTaskStartScheduler(); or from callback routine. On this device the MPU is used to protect a portion of Flash and RAM for kernel usage. All user task are running in user mode(non privilege mode) and so cannot use the xTimer API. Can someone clarify or I'm doing something completly wrong. Thanks in advance. Jean-Marc Privilege modePosted by rtel on September 2, 2014 We don't provide an MPU version of the Cortex-R port, so really it is a question for whoever supplied you the code - but if it is modeled on the Cortex-M MPU code then this is a known issue and is on the 'known issues' list. You can add the timer functions to the list of privileged functions relatively easily - if you search hard enough in this forum (you may be better off using the archive on the FreeRTOS.org webiste) you may find other discussions on this topic. Regards.
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