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@ -48,21 +48,11 @@ Just __Voice Calls and SMS__, using PinePhone's LTE Modem.
(__LTE Modem__ is the hardware inside PinePhone that handles 4G Voice Calls, SMS and Mobile Data)
_This is useful because...?_
_Why is this useful?_
So we can pop a microSD Card (and SIM) into any PinePhone...
Maybe we can pop a microSD Card (and SIM) into any PinePhone...
And turn it instantly into an __Emergency Phone__?
_But we need USB to run PinePhone as a Feature Phone?_
Sadly we can't control PinePhone's LTE Modem by sending AT Commands over the UART Port.
[(Unlike other LTE Modems)](https://lupyuen.github.io/articles/get-started-with-nb-iot-and-quectel-modules)
Instead, PinePhone talks to the __LTE Modem over USB__.
(Explained in the next chapter)
And turn it instantly into an __Emergency Phone__ with NuttX?
_What if there's no LTE Network Coverage? Like in a Natural Disaster?_
@ -96,22 +86,22 @@ Maybe someday? We're still lacking plenty of drivers: WiFi, Bluetooth LE, GPS, A
Probably better to start as a Feature Phone (or LoRa Communication) and build up.
![Quectel EG25-G LTE Modem in PinePhone Schematic (Page 15)](https://lupyuen.github.io/images/usb2-title.jpg)
Let's talk about PinePhone's LTE Modem...
[_Quectel EG25-G LTE Modem in PinePhone Schematic (Page 15)_](https://files.pine64.org/doc/PinePhone/PinePhone%20v1.2b%20Released%20Schematic.pdf)
![Quectel EG25-G LTE Modem](https://lupyuen.github.io/images/usb2-modem.jpg)
# LTE Modem on USB
[_Quectel EG25-G LTE Modem_](https://wiki.pine64.org/wiki/File:Quectel_EG25-G_LTE_Standard_Specification_V1.3.pdf)
# Quectel EG25-G LTE Modem
_What's this LTE Modem?_
Inside PinePhone is the [__Quectel EG25-G LTE Modem__](https://wiki.pine64.org/index.php/PinePhone#Modem) for 4G Voice Calls, SMS, Mobile Data and GPS...
Inside PinePhone is the [__Quectel EG25-G LTE Modem__](https://wiki.pine64.org/index.php/PinePhone#Modem) for 4G Voice Calls, SMS, Mobile Data and GPS (pic above)...
- [__Quectel EG25-G Datasheet__](https://wiki.pine64.org/wiki/File:Quectel_EG25-G_LTE_Standard_Specification_V1.3.pdf)
- [__EG25-G Hardware Design__](https://wiki.pine64.org/wiki/File:Quectel_EG25-G_Hardware_Design_V1.4.pdf)
[(EG25-G runs on __Qualcomm MDM 9607__ with a Cortex-A7 CPU inside)](https://xnux.eu/devices/feature/modem-pp.html#toc-modem-on-pinephone)
To control the LTE Modem, we send __AT Commands__...
- [__EG25-G AT Commands__](https://wiki.pine64.org/wiki/File:Quectel_EC2x%26EG9x%26EG2x-G%26EM05_Series_AT_Commands_Manual_V2.0.pdf)
@ -124,6 +114,22 @@ So to dial the number __`1711`__, we would send this AT Command...
ATD1711;
```
[(EG25-G runs on __Qualcomm MDM 9607__ with a Cortex-A7 CPU inside)](https://xnux.eu/devices/feature/modem-pp.html#toc-modem-on-pinephone)
_We send AT Commands to the LTE Modem over UART?_
Sadly we can't send AT Commands to PinePhone's LTE Modem over the UART Port.
[(Unlike other LTE Modems)](https://lupyuen.github.io/articles/get-started-with-nb-iot-and-quectel-modules)
Instead, PinePhone talks to the LTE Modem over USB...
![Quectel EG25-G LTE Modem in PinePhone Schematic (Page 15)](https://lupyuen.github.io/images/usb2-title.jpg)
[_Quectel EG25-G LTE Modem in PinePhone Schematic (Page 15)_](https://files.pine64.org/doc/PinePhone/PinePhone%20v1.2b%20Released%20Schematic.pdf)
# LTE Modem talks on USB
_How is the LTE Modem connected to PinePhone?_
According to the [__PinePhone Schematic__](https://files.pine64.org/doc/PinePhone/PinePhone%20v1.2b%20Released%20Schematic.pdf) (Page 15), the Quectel EG25 LTE Modem connects to the Allwinner A64 SoC on the USB Pins...