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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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List of tips on what to check when it hangsPosted by Nobody/Anonymous on June 24, 2006 I am quite new to FreeRTOS and often find myself doing some changes to my code, only to find it doesnt work anymore.... recognise this? Especially if you change more than just a few lines of code.... So, heres my personal check-list when that happens. Please post also your tips here! Crash solving for FreeRTOS, AT91SAM7A3-EK and IAR EWARM: * try to reboot the Eval card * no bounds check : added too much text to a string (than allocated)? * no auto size heap: added too much vars for the task heap size? * some task blocking long times, and locking itself? * some task in a non-blocking wait, locking other lower tasks? * vars in a function are only initialised once ... * increase total heap size if added more tasks, queues, semaphores * check task prios - someone locking the others? * check irq levels - someone taking over? * check rtos tick rate, runing too fast/slow? * try reboot jtag * try reboot iar ewarm * constant meant to be float is defined without decimal point * connected peripheral cant keep up (115200kbps serial port for example) * queuSendFromIsr must always start with taskwoken=pdFALSE * any ISR running too much/fast/wild? pwm... adc... dbgu/usart... * check the A3 errata section in the datasheet * could be a bug in an example file, in FreeRTOS or the A3 chip, check the web RE: List of tips on what to check when it hangsPosted by Nobody/Anonymous on June 24, 2006 one more... * try running in non-debug mode RE: List of tips on what to check when it hangsPosted by Nobody/Anonymous on June 25, 2006 Some of these (variable initialization, etc) are C related rather than FreeRTOS but maybe some others could form part of a check list in the FAQ section? RE: List of tips on what to check when it hangsPosted by Nobody/Anonymous on June 25, 2006 Yes, that would be a good idea. Especially if we get more people contributing and someone really good at this sorting, selecting and explaining... I do think its quite important to have the non RTOS stuff too.... The most common C errors and also HW related stuff like trying reboot the card, and compiler related like trying non-debug mode. Also to show that not everything is RTOS blame...;-) It could be divided into sections, like RTOS, C/Asm, Compiler/GUI, HW, Misc etc for a complete "FreeRTOS Developers checklist".... What would be nice is an ordered list, listing the most common problems first (roughly), like rebooting the HW that I have to do all the time... but then the different sections fall... Perhaps: 1. Try rebot your HW (HW) 2. Higher prio task blocking (RTOS) 3. Variable initialization (C/Asm) 4. xxxx x x x x x x (HW: IAR + AT91) 5. ..... /PM
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