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TMS320F280049: CLA background task无法自运行

Part Number: TMS320F280049

各位大神好,我在调CLA时,准备把TASK8配置为background任务,如下配置可运行background任务:

参考的是cla_ex3_background_nesting_task

CLA_mapBackgroundTaskVector(CLA1_BASE, (uint16_t)&Cla1BackgroundTask);
CLA_enableHardwareTrigger(CLA1_BASE);
CLA_setTriggerSource(CLA_TASK_8, CLA_TRIGGER_ADCA1);
CLA_enableBackgroundTask(CLA1_BASE);

但是,根据cla_ex2_background_task配置如下,background任务就没有持续执行:

CLA_mapBackgroundTaskVector(CLA1_BASE, (uint16_t)&Cla1BackgroundTask);
CLA_disableHardwareTrigger(CLA1_BASE);
CLA_setTriggerSource(CLA_TASK_8, CLA_TRIGGER_SOFTWARE);
CLA_enableBackgroundTask(CLA1_BASE);
CLA_startBackgroundTask(CLA1_BASE);

不知道是哪里设置的问题。