USBD BLE UART Example - Central

RE: USBD BLE UART Example - Central

manuwind — Thu, 27 Feb 2020 00:20:36 GMT

Hi all,

I am checking the Uart central and peripheral projects, also the one with usbd and I have one question that may be obvious for you.

How do you select the peripheral to connect with?

In a cellphone you select the device you want.

I see there is a scan_start function and the NRF_BLE_SCAN_EVT_CONNECTED event but no code to select the peripheral.

I have already implemented a MIDI BLE peripheral with the dk52, now I need the MIDI BLE central.

Thank you in advance,

Manuel

RE: USBD BLE UART Example - Central

cachro2 — Tue, 12 Nov 2019 18:12:55 GMT

Thanks!

RE: USBD BLE UART Example - Central

Sigurd — Tue, 12 Nov 2019 17:08:51 GMT

[quote userid="84877" url="~/f/nordic-q-a/54154/usbd-ble-uart-example---central/219551"]Are there compelling reasons as they relate to this example why we should change to SDK 16?[/quote]

No. The main new feature in SDK 16 is support for nRF52833. There are a couple of bugs fixes in SDK 16, but nothing major related to this example.

RE: USBD BLE UART Example - Central

cachro2 — Mon, 11 Nov 2019 21:37:45 GMT

Thank you! Brilliant, worked perfectly. I am thoroughly impressed by Nordic's organization of the application code as they relate to the wireless communication stacks. The only additional modification I made to get it to compile was to comment out #include "nrf_sd_def.h" in sdk_resources.h (line 52):

#if defined(SOFTDEVICE_PRESENT) || defined (BLE_STACK_SUPPORT_REQD) || defined (ANT_STACK_SUPPORT_REQD)
//    #include "nrf_sd_def.h"
#else

Now as you may have guessed my final question pertains to SDK 16. I found the migration guide (https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_nrf5_v16.0.0%2Fmigration.html&cp=5_1_1_8) and at a glance it does not seem like there is too much to change but I am new to your hardware. Are there compelling reasons as they relate to this example why we should change to SDK 16? The changelog doesn't really make it seem so:

Added support for the nRF52833 DK and nRF52833 SoC
Added support for Bluetooth LE SoftDevices version 7.0.1, as well as the new SoftDevice S113
Added an external Tile library and a corresponding example demonstrating the "find me" feature

Thanks.

RE: USBD BLE UART Example - Central

Sigurd — Mon, 11 Nov 2019 09:05:16 GMT

Ideally, the project should be ported to SDK 16. But porting the project to use the newest SoftDevice should be straightforward. Looking at the s140_nrf52_7.0.1_migration-document.pdf, some PPI macros are changed, and BLE_COMMON_OPT_ADV_SCHED_CFG is removed, but this project are not using those.

So to migrate to SoftDevice v7.0.1, replace the headers found in SDK_15_3_folder\components\softdevice\s140\headers , with the new S140 v7.0.1 headers.

Then, in the SES project, change FLASH_START from 0x26000 to 0x27000, and set FLASH_SIZE=0xd9000

Also change RAM_START and RAM_SIZE according to this figure:

Might also want the loader to point to the new SD version:

Then recompile the application.

RE: USBD BLE UART Example - Central

cachro2 — Thu, 07 Nov 2019 22:22:15 GMT

Fantastic. Works like a charm using SoftDevice s140 v6.1.1 on both the Nordic PCA10059 and the Laird BL654 USB module (451-00004). However, the USB Serial Device does not pop up in Device Manager when I use Softdevice s140 v7.0.1. Pardon my ignorance, but is there an easy way to modify the project so that it works with the newest protocol stack?

RE: USBD BLE UART Example - Central

Sigurd — Thu, 07 Nov 2019 19:21:53 GMT

Hi,

I believe the easiest approach would be to take the usbd_ble_uart example, and replace the ble_app_uart specific part of the code with the ble_app_uart_c code.

That said, you can find a central version of the usbd_ble_uart example attached in this post (for SDK 15.3). I recommend to use the Segger Embedded Studio(SES) project. Note that if you are using a newer version of SES, you need to set NRF_FPRINTF_FLAG_AUTOMATIC_CR_ON_LF_ENABLED to 0 in sdk_config.h in order to get RTT logging working correctly(useful if using a DK).