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squeak-phone/devices/pine64-pinephone/modem-docs
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Tony Garnock-Jones a0cdf56b1b Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
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EG25-G reverse engineering_files Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
Modem on PinePhone_files Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
80545ST10798A_LM940_QMI_Command_Reference_Guide_r3.pdf Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
EG25-G reverse engineering.html Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
Modem on PinePhone.html Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
Qualcomm Gobi devices on Linux.pdf Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
Quectel_EC2x&EG9x&EG2x-G&EM05_Series_AT_Commands_Manual_V2.0.pdf Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
Quectel_EC2x&EG9x&EG2x-G&EM05_Series_GNSS_Application_Note_V1.3.pdf Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
README.md Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00
modem.txt Initial commit - project started Aug 2020 (!) 2022-03-09 16:37:19 +01:00

README.md

PinePhone docs

The modem AT interface is on /dev/EG25.AT, which is a symlink (!) to ttyUSB2:

lrwxrwxrwx    1 root     root             7 Nov 26 15:17 EG25.AT -> ttyUSB2
lrwxrwxrwx    1 root     root             7 Nov 26 15:17 EG25.MODEM -> ttyUSB3
lrwxrwxrwx    1 root     root             7 Nov 26 15:17 EG25.NMEA -> ttyUSB1

Generally useful settings:

ATE0Q0V1X4
AT+CMEE=1
  • E0 = don't echo commands sent to modem
  • Q0 = don't be quiet, output responses
  • V1 = use verbose response codes (alternative is numeric, might be worth looking into)
  • X4 = use detailed CONNECT responses, dial tone detection, and busy tone detection
  • +CMEE=1 = use numeric error codes (cf +CMEE=2, verbose values)

Result codes "OK", "CONNECT", "RING", "NO CARRIER", "ERROR", "NO DIALTONE", "BUSY", "NO ANSWER"

ATS3 and ATS4 allow customised replacements of CR and LF, respectively; might be useful for improved packetisation??

  • AT+CFUN=0 --> minimum functionality
  • AT+CFUN=1 --> full functionality
  • AT+CFUN=1,1 --> full functionality and RESET THE MODEM
  • AT+CFUN=4 --> transmit and receive RF signals DISABLED (flight mode??)

Consider UCS2 character set selection via AT+CSCS="UCS2".

Error code table (see table 22, section 15.4, page 293 of the Quectel manual):

Error code Error message
+CME ERROR: 10 +CME ERROR: SIM not inserted
+CME ERROR: 13 +CME ERROR: SIM failure

URC = Unsolicited Response Code. You can tell it to send URCs to a different port, to avoid interference with the regular AT command/response parsing. See command AT+QURCCFG.

Interesting stuff about +QCFG configuring individual URC types here: https://todo.sr.ht/~anteater/mms-stack-bugs/40

Most stacks seem to set URCs to go to the AT interface ("usbat"). The modem's default seems to be "all".

Lots of great stuff here https://gitlab.com/mobian1/devices/eg25-manager (of course!)

  • AT+CPAS gets call status: 0 ready, 3 ringing, 4 call in progress or call on hold
  • AT+CEER gets extended error report