itbrainpower.net
THE ALPHABET PROJECT - professional Arduino, BeagleBone & Raspberry PI shields



Order product(s) of the week. Order itbrainpower.net u-GSM modems.
Read our last post: Modems and RaspberryPI 5. RaspberryPI OS [Debian 12 bookworm] notes..

PocketBeagle interfacing with u-GSM modem(s) howto

 

About this

This notes refers how to interface the PocketBeagle board with itbrainpower.net u-GSM family modem.

 

The u-GSM modem family consist in around ~22 modem types having RPI and BeagleBone Black P9 interfaces embedded.

 

PocketBeagle pinout for uGSM modem interfacing

 

Involved parts

* BC95G (do not be confused with BG95-M2 or BG95-M3) does not have ppp support included.

** first generation itbrainpower modular modems does not have P9 interface integrated, but still can be interfaced with BBB using wires.


I stress you again! LiPo/LiION battery OR super-capacitor are REQU7ERED for proper u-GSM functionality! ***

*** for low power LTE u-GSM modems used in LTE-CATM or NBIoT mode only [BG95-M2 and BG96/BG95-M3 having 2G mode restricted], the LiPO battery or the super-capacitor can be safely replaced with 1000-1500uF/6.3V LOW ESR capacitor.

 

 

Knowledge and skills required

  • PocketBeagle / BeagleBone Black hardware experience,
  • Soldering

 

 

Some PocketBeagle and u-GSM hardware references

u-GSM BBB embedded P9 interface

u-GSM modem pinout and embedded BBB P9 interface

 

 

Condensed PocketBeagle P2 interface [only pins involved in interfacing with the u-GSM modem]

required PocketBeagle logical pins for uGSM modem interfacing


To identify all GPIO pins, you may like to take a look at PocketBeagle GPIO headers P1 and P2 - pinout.

 

 

Prepare the u-GSM modem for usage


Solder the LiPO/LiION battery connector or the super-capacitor as shown in BBB/RPI u-GSM hardware integration post.

HINT: for low power LTE modems used in LTE-CATM or NBIoT mode only [BG95-M2 and BG96/BG95-M3 having 2G mode restricted], the LiPO battery or the super-capacitor can be safely replaced with 1000-1500uF/6.3V LOW ESR capacitor.

 

 

Hardware information for u-GSM modem interfacing [map interfacing]

 

Logical pins - simply connect as shown bellow:

u-GSM modem BBB interface P9.16 [GPIO51] <====> PocketBeagle P2.10 [GPIO52]

u-GSM modem BBB interface P9.14 [GPIO50] <====> PocketBeagle P2.08 [GPIO60]

u-GSM modem BBB interface P9.12 [GPIO60] <====> PocketBeagle P2.06 [GPIO57]

u-GSM modem BBB interface P9.13 [GPIO31] <====> PocketBeagle P2.07 [UART4 TX / GPIO31]

u-GSM modem BBB interface P9.11 [GPIO30] <====> PocketBeagle P2.05 [UART4 RX / GPIO30]

 

Power supply pins - read PocketBeagle docs!!!!:

u-GSM modem BBB interface BBB P9.01 [GND] <====> PocketBeagle GND

u-GSM modem BBB interface BBB P9.05 [5V] <====> PocketBeagle VIN / VOUT

 

That's all about hardware interfacing.

 

 

Linux Debian 10 how to

Simply port the BeagleBone Black Debian 10 howto to PocketBeagle using the ports map bellow.

 

BeagleBone Black =====> PocketBeagle

P9.14 [GPIO50]   =====> P2.08 [GPIO60]

P9.12 [GPIO60]   =====> P2.06 [GPIO57]

P9.13 [GPIO31]   =====> P2.07 [GPIO31]

P9.11 [GPIO30]   =====> P2.05 [GPIO30]

 

HINT: the PocketBeagle serial port dedicated for communication with the u-GSM modem remains available as /dev/ttyO4.

 

 

Useful PocketBlack references.

- PocketBeagle wiki
- PocketBeagle GPIOs
- PocketBeagle reference manual
- PocketBeagle (Debian 10.3) images
- and last, but not least OSD3358 system in package

 

Keep calm, understand what's under the BBB blanket, follow the principles presented above and maybe write your own overlay!?

 

 

TUTORIAL & SOFTWARE ARE PROVIDED WITHOUT ANY WARRANTY!!! USE IT AT YOUR OWN RISK!!!!

 

 

Dragos Iosub & itbrainpower.net team original how to.

 

 

 

 

document version 1.011 / 2023-03-27 © R&D Software Solutions srl