brok85
Lurker
Hi everyone,
I am new to this forum so this is my first post
I am writing this post because I need help for clarifying some aspects of the radio interface layer.
I know that the two main components of the RIL stack are RILD (which interfaces the Java part with the low-level hardware) and vendor-RIL (which interfaces RILD with the modem). Both of them have loops that are used to capture and analyze new commands of events coming from other layers. These loops are the rild event loop, which handles requests from upper and lower layers of Android, and vendor reader loop, which handles the commands from and to the modem. However, I am not 100% sure whether these loops are polling based (i.e., looping all the time even when there are no new data to process) or they are triggered only when a new data or command is received (i.e., interrupt based). At first I thought that it is polling based because of the "loop until 2012 (the end of the world)" in slide number 12 in the presentation "Android RIL - Radio Interface Layer" available here : http://www.slideshare.net/leafjohn/ril-and-android-telephony?related=1 . I also think that the maintenance of the IPC socket of communication between RILD and RILJ (the java part of the RIL stack) to allow RILD and RILJ to exchange communications and data is polling based (it loops even when there is nothing to process).
In summary, I would really like your opinion to clarify the following questions:
1) Is the exchange of data between the baseband processor and the application processor interrupt based or polling based?
In practice, is the application processor polling regularly the port of communication with the baseband to check for the presence of new commands from the baseband, or the application processor is woken up by some sort of interrupt generated by the baseband processor as soon as the baseband has to communicate some new commands?
2) how the vendor reader loop detects the presence of a new unsolicited command? Is the vendor reader loop running even when there are no new commands or it is started only in the presence of a new unsolicited command?
In the case in which the reader loop is started only when a new unsolicited command is detected, what component or process starts this vendor reader loop?
3) is the rild event loop running all the time to check whether some events have been detected by the vendor RIL or it runs only when the vendor RIL adds a new event in the event queue of RILD?
In the case in which the event loop is started only when a new event has been added to the event queue, what component or process starts this event loop?
4) How RILD maintains the communication sockets with the java part of the RIL stack (RILJ)? Are they opened only when there are new data to exchange or they are maintained open all the time?
Thanks I a lot for any information and help you can give me. I really appreciate it.
I am new to this forum so this is my first post
I am writing this post because I need help for clarifying some aspects of the radio interface layer.
I know that the two main components of the RIL stack are RILD (which interfaces the Java part with the low-level hardware) and vendor-RIL (which interfaces RILD with the modem). Both of them have loops that are used to capture and analyze new commands of events coming from other layers. These loops are the rild event loop, which handles requests from upper and lower layers of Android, and vendor reader loop, which handles the commands from and to the modem. However, I am not 100% sure whether these loops are polling based (i.e., looping all the time even when there are no new data to process) or they are triggered only when a new data or command is received (i.e., interrupt based). At first I thought that it is polling based because of the "loop until 2012 (the end of the world)" in slide number 12 in the presentation "Android RIL - Radio Interface Layer" available here : http://www.slideshare.net/leafjohn/ril-and-android-telephony?related=1 . I also think that the maintenance of the IPC socket of communication between RILD and RILJ (the java part of the RIL stack) to allow RILD and RILJ to exchange communications and data is polling based (it loops even when there is nothing to process).
In summary, I would really like your opinion to clarify the following questions:
1) Is the exchange of data between the baseband processor and the application processor interrupt based or polling based?
In practice, is the application processor polling regularly the port of communication with the baseband to check for the presence of new commands from the baseband, or the application processor is woken up by some sort of interrupt generated by the baseband processor as soon as the baseband has to communicate some new commands?
2) how the vendor reader loop detects the presence of a new unsolicited command? Is the vendor reader loop running even when there are no new commands or it is started only in the presence of a new unsolicited command?
In the case in which the reader loop is started only when a new unsolicited command is detected, what component or process starts this vendor reader loop?
3) is the rild event loop running all the time to check whether some events have been detected by the vendor RIL or it runs only when the vendor RIL adds a new event in the event queue of RILD?
In the case in which the event loop is started only when a new event has been added to the event queue, what component or process starts this event loop?
4) How RILD maintains the communication sockets with the java part of the RIL stack (RILJ)? Are they opened only when there are new data to exchange or they are maintained open all the time?
Thanks I a lot for any information and help you can give me. I really appreciate it.