General Question about Using Legato for Products


#1

I am creating a product for a company that will use a few Sierra Wireless chips, particularly a cellular and a GPS chip. I will also need an accelerometer and a bluetooth module. I have a mangOH red board with a WP8548 as well as an HL cellular chip I can swap out. If I use the WP8548, I could have everything I need on this one mangOH board for prototyping and I could write my application using the Legato platform. Currently the plan is to use a separate MCU and then talk to the cellular chip via UART, as well as talk to a separate Sierra XA 1110 via UART ( by the way, if anyone knows how to talk to this XA1110 chip via I2C, please let me know. I cannot find ANY documentation on how to do this. For example, what is its I2C device address? And do I need a UART as well as I2C if all I want to do is grab location data?). Would be great if I could just use the mangOH red board for prototyping and write my application using the Legato platform…but my question is will the chip have to be recertified if I add my own application code to the WP8548??(meaning the cellular certification to make sure it doesn’t mess their networks up). Or is the cellular firmware locked down somehow?


#2

The cellular firmware is locked down. You dont need to re-certify the module.
You are only adding an application in legato and/or building new drivers in the linux layer.


#3

Thank you very much for your reply. I had a distributor of Sierra Wireless products tell me I would have to have it re certified. But it didn’t make sense to me. Luckily I just started this project and can maybe switch the direction I am going. Thanks again !!!


#4

Note this is about the module. Now if you are doing a product, of course you need to get the whole product certified. Is that clear?


#5

Yes. But in this case, it wouldn’t matter if I used the WP8548 to run my app, or used a separate MCU plus an HL7748. Correct ? There won’t be any extra certification from creating my app on the 8548 Legato platform. This is now how I understand it.


#6

Yes, that’s correct.


#7

Great. Thank you. Low power is a big requirement and it seems this platform can run a long time on a single charge. The fact I can use the mangOH board for my entire development is a plus too.