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smartRF05 does not scan devices

Other Parts Discussed in Thread: CC2540

hello,

 I have a smartRF05 development kit.when testing simpleBLECentral_cc2540 example. I find it does not scan any device. Actually there is many BLE device equipped with CC2540. Lightblue can scan many devices.  when pushing the joystick to up, board start to scan ,however after a while, the LCD display "found device 0". is there any setting wrong in my project ? I just open the original example and change the INT_HEAP_LEN from 3072 to 3000.Please give me some advice Thanks.