Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

random — Tue, 19 Aug 2014 13:27:53 GMT

Ahhh i see now! I'm sorry for such amateur questions but I'm really new to the hardware world. Things are crazy here.

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

Steven L. — Mon, 18 Aug 2014 21:50:54 GMT

If you follow the definition of LED_0 and LED_1 you will come up to a number, 17 and 18 I believe. Those are the GPIO ports in the CPU. Now if you check the schematics, those ports are connected to those jumper ports.

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

random — Mon, 18 Aug 2014 20:49:30 GMT

I don't understand how you specify the LED pin. All I see is LED_0 and LED_1. How is that specifying P2.31??

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

Steven L. — Tue, 12 Aug 2014 22:09:08 GMT

No modifications. If you check the main function you will see that many functions are called before advertising_start() is called, which is the call that will make your device be visible to the world so anything in between may be failing or your program may not be starting at all, for example because is flashed at the wrong address. This is my command (loadbin _build/ble_uart_s110_xxaa.bin 00016000)

The easiest way would be to use a debugger, under Linux I use the JLinkGDBServer and arm-none-eabi-gdb. Set a breakpoint at main and step through the code, if anything is failing you will find out right away.

Startig the JLinkGDBServer:

JLinkGDBServer -device nrf51422 -if swd -speed 1000 -port 8080

my .gdbinit:

target remote localhost:8080
break main
monitor reset
continue .gdbinit

If you can't debug and don't have a console connected to uart, another approach is to use the LED, making it blink after each function call.

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

random — Tue, 12 Aug 2014 18:36:16 GMT

Did you have to modify the code at all? I was able to get the hardware setup and install fine but I'm not able to see it in the Master Control Panel or on my iOS device. Any suggestions??

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

Steven L. — Mon, 11 Aug 2014 23:37:25 GMT

I added a second picture to my answer.

The BLE UART demo is in the nrf51822 folder, but it works with the nrf51422.

SDK_FOLDER/nrf51822/Board/pca10001/s110/experimental/ble_app_uart

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

random — Mon, 11 Aug 2014 19:47:33 GMT

Also, what example did you say you were running? I don't see a BLE/UART in the s110 folder (including in the experimental folder of Board/s110).

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

random — Mon, 11 Aug 2014 16:07:16 GMT

Thank you for your answer! It's been extremely helpful and I think I'm almost there. Could you post a large picture of your hardware setup? The UART chip and everything in the pic??

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

random — Mon, 11 Aug 2014 14:32:58 GMT

Thanks for your incredibly helpful answer RK.

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

Steven L. — Fri, 08 Aug 2014 03:54:11 GMT

I have the PCA10006, which has the nRF51422 but I assume it should be the same for you. Check the schematics for your board to be sure you are connecting everything to the right ports. They should be listed as hardware files in your "my downloads" page.

On my board, P2.02 is connected to VCC with 3.6v, P2.06 to GND, with that the chip now powers up and is visible to the Segger debugger. Then on P2.31 and 32 (or fifth position up->down) I connect the LEDs.

P1. positions 30 and 32 (or 5 and 6 counting up on the same row) have TX/RX which is connected to a UART module with an FTDI chip on it.

The board in the picture is running the S110 experimental BLE/UART app, when I connect from the Android app the green LED turns on and the red turns off.

Edit:

Added image:

RE: Blink LED with nRF51822 Developer Kit / Bluetooth Smart Beacon Kit

RK — Thu, 07 Aug 2014 23:07:54 GMT

well no to the first one because it doesn't have an LED on it, yes to the second because it does.