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AWR2944EVM: 任务延时:函数vTaskDelay可用,但函数xTaskDelayUntil 编译显示unresoved symbol

Part Number: AWR2944EVM

想控制某个任务的执行周期在50ms,如果任务时间小于50ms,便通过延时的方法使其达到50ms。显示尝试使用vTaskDelay,感觉延时时间不是很精确,得知xTaskDelayUntil 时间控制准确,想使用xTaskDelayUntil ,但是编译的时候CCS提示unresoved symbol,这是啥原因?

ccs 版本12.6