i.MX ProcessorsのトピックAndroid RIL GPRS MODEM

Android RIL GPRS MODEM

leonardoprates — Mon, 19 Sep 2016 18:45:17 GMT

I'm trying integrate a GPRS modem in Android 6.0.1 without sucess. Modem works well at hardware level and answer correctly AT commands. In Android UI I only see SIM card not present and not related do modem works.

In Android log I can see a lot of subId=-2, phoneId=-1, slotId=-1, I think my problem is because of this wrong numbers.

Someone with experience in Android RIL could help me to understand how this numbers are generate and where?

Thanks,

Leonardo

Re: Android RIL GPRS MODEM

weidong_sun — Tue, 27 Sep 2016 03:27:13 GMT

Hello Leonardo,

Suggest you read the document or comare your steps with it to check if you forgot something, because GPRS module is not manufactured by us, I only give you some advice.

---See the link, please!

https://www.u-blox.com/sites/default/files/AndroidRIL-SourceCode_AppNote_(UBX-13002041).pdf

In addition, You can also get a lot of experience on how to integrate GPRS to android from internet.

How to integrate GSM/2G Modem in Android – To establish data Connection | Linux & Android Blog

Hope above information can help you!

Best Regards,

Weidong

Re: Android RIL GPRS MODEM

leonardoprates — Tue, 27 Sep 2016 12:08:20 GMT

I discovered the root cause of the problem. The subid number is generate from iccid of simcard. Android gets it calling AT+CRSM=176,12258,0,0,15. In my case the problem is exactly this command, because modem doesn't accept P3 parameter as 15, the correct is 10 (AT+CRSM=176,12258,0,0,10). The solution in my case was change the P3 parameter inside reference-ril, when command is 12258. See below. Now Android can get iccid and subId, phoneId and slotId are correct and I can see the modem signal. Now I'm implementing the gsm0710muxd to get two channels, because Android needs one for command and another for data.

Inside this function: void requestSIM_IO(void *data, size_t datalen __unused, RIL_Token t)

Add:

if (modemModel & MDM_GL865){ // SEVA
   if (p_args->fileid == 0x2FE2) {
      if (p_args->command == 0xb0) {
         p_args->p3=10; //Change P3 from 15 to 10
      }
   }
}