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"the use of SWI"

          On the DM648 platform, When the acquisition interrupt completed ,I send SWI_post to start the soft interrupt, but I found when I call  NOR_writeBytes and NOR_erase in the other thread, it will be caused the program run fly.the use of Soft interrupt  can not be pended, but I called FLASH operating in the other thread, may I ask why there is such a problem, how do I solve ?thank you !