Question about nRF51-DK Board LED problem(not blink)

[neil]

Hello, I've started bluetooth development with nRF51 DK since yesterday.

My devlopment platform is KEIL-MDK(v5)

Yesterday, I just tested my board, download the blink example and check the LED1 is blinking which period is 0.5sec.

Today, I tried to flash ble_app_proximity_pca10028 and the LED1 blinking so fast. I saw the document that when nRF51422 now advertising, the blinking period is 2 sec. And my android(nexus 7) cannot find Nordic_prox.

So I clicked the flash -> erase and clock download.

And then, my nRF51-DK do not blink LED1 and cannot run debug (it can download and erase also start debug, but cannot run, if I click run button, it finished soon)

What's the problem?YY

[Nguyen Hoan Hoang]

The softdevice (S110, S120, ...) is required to run BLE app. You need to flash it in first. There is a hex file that comes with it. Download it form nordicsemi.com.