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关于CC2530定时器的问题，TI员工大神们帮帮忙吧

cherlesan Chen
Prodigy 81 points

osal_start_timerEx( MyApp_TaskID,SEND_DATA_EVENT,(MYAPP_SEND_MSG_TIMEOUT+ (osal_rand() & 0x00FF)) );

这个定时器开启函数，最后加一个osal_rand() & 0x00FF和不加这个的区别是什么呀？