BLE as Peripheral

[Muqarrab]

Hi,

I have started development on nrf52840.

I want to use BLE as a Peripheral.

Can you please suggest me which example I can use for sending characteristics and add my own new characteristics(from nRF5 SDK)?

Any document/link to add services/characteristics in the Example project and add PWM/UART/timers turn different pins HIGH/LOW etc

Thanks!

[awneil]

SDK - start here:

https://infocenter.nordicsemi.com/topic/struct_sdk/struct/sdk_nrf5_latest.html

BLE Peripheral examples:

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.0/examples_ble_peripheral.html

Tutorial:

https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/ble-services-a-beginners-tutorial

[Muqarrab]

Thanks for your suggestion.
Which peripheral example should I start in which I can add more characteristics?And How?

[Muqarrab]

Hi,
1-I have successfully programmed the s140_nrf52_7.0.1_softdevice.hex. 



2-Now when I Build and Run the ble_app_template project LED1 starts blinking But when I Build and Run my modified project LED1 not start blinking and the device is also not advertising.


Can you please suggest any solution?

Thanks!

[awneil]

Muqarrab said:

Can you please suggest any solution

You really need to use the debugger to see what is going on!

[Muqarrab]

I am debugging the code and I think it stuck here.

Can you please check and give a solution. Thanks

  

[awneil]

That means you've had a Fatal Error - so you need to step back a bit to see what caused that error.

If you enable debug logs, they should give you more info ...

[Muqarrab]

Hi awneil

I have enabled debug logs but can't see anything there.
Then I changed the following value in sdk_config.h and able to see logs in the Debug terminal.

NRF_FPRINTF_FLAG_AUTOMATIC_CR_ON_LF_ENABLED 0

Here is the error list.

I have changed the values "Project -> Options" as follow

RAM_START=0x20002270



Now, LED1 has started blinking and BLE also started advertising.
But when I am trying to connect it's immediately disconnected.
I have attached the Segger+nRF Connect logs.





 

Any solution for this, please?

[awneil]

logs come out either via RTT - which requires a Segger J-Link (the one on a DevKit will do) - or via the UART

[Muqarrab]

Hi awneil

<info> app_timer: RTC: initialized.
<info> app: Template example started.
<info> app: Fast advertising.
<info> app: Connected.
<error> app: ERROR 8 [NRF_ERROR_INVALID_STATE] at C:\Nordic\SDK\nRF5SDK17009d13099\nRF5_SDK_17.0.0_9d13099\examples\ble_peripheral\custom_ble_service_example\main.c:482
PC at: 0x0003298B
<error> app: End of error report



Any suggestions for this?
Thanks!

[Muqarrab]

Also, I have set device name as follow but BLE is advertising only with first 4 chars.

#define DEVICE_NAME "Nordic_Template" /**< Name of device. Will be included in the advertising data. */

The BLE advertising name is showing "Nord".

[Muqarrab]

The connection Problem Has been solved by commenting this:

case BLE_GAP_EVT_CONNECTED:
NRF_LOG_INFO("Connected.");
err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
APP_ERROR_CHECK(err_code);
m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
// APP_ERROR_CHECK(err_code);
break;

[awneil]

That's not solving the problem - that's just masking the symptoms!

As noted earlier, you were ending up in the Fatal Error handler; ie, the APP_ERROR_CHECK that you've commented out was detecting an error.

Don't just ignore this error:  find out what error it is, why it's happening - and fix it!