Integration Manual

NINA-B4 series - System integration manual
UBX-19052230 - R09 u-connectXpress software Page 48 of 60
C1-Public
8. Prepare the bootloader to accept a file transfer using XMODEM protocol. Enter the configuration
action command “x” with the ConnectivitySoftware values <imageaddress>, <imagesize>,
<imagename> <permissions>, and <imageid> defined in the NINA-B41X-CF-<version>.json file.
NINA-B4 returns a series of ‘C’ characters for as long as the bootloader is running.
9. While the bootloader is running, send the u-connectXpress NINA-B41X-SW-x.y.z-<buildnr>.bin
file to NINA-B4. The file is sent using XMODEM protocol.
10. Set the connectivity software as the startup image. Once the binary file has been sent, enter the
configuration action command “f” with the ConnectivitySoftware value <imageid> defined in the
NINA-B41X-CF-<version>.json file.
11. Enter the configuration action command “q” to reset and start the module with the newly flashed
software.
For further information about bootloader commands and their parameter syntax, see the
u-connectXpress bootloader protocol specification [25]and u-connectXpress AT commands
manual [6].
4.2 Low frequency clock source
NINA-B4x modules are delivered without an external low frequency crystal oscillator (LFXO). The low
frequency oscillator is used for power save and by the radio block. The u-connectXpress software has
an auto sense functionality to detect whether a low frequency crystal oscillator is mounted on the
board. For more information, see also the respective datasheet [2][3].
The EVK NINA-B41x is delivered with an external low frequency crystal oscillator mounted.
> x 0 155260 ConnectivitySoftware rwx 0
CCCCCCCCCCCCCCCCCCCCCCCCCC
> f 0
OK
>
> q
+STARTUP