Debugging possible HW Issue with DFU

RE: Debugging possible HW Issue with DFU

Henry Dang — Tue, 13 Dec 2022 21:27:21 GMT

Good news, after replacing the module from a bad one onto a good unit, we were able to get DFU working. So looks like it was a board issue and not a module one.

Thank you for your help

RE: Debugging possible HW Issue with DFU

Priyanka — Mon, 12 Dec 2022 10:23:46 GMT

It does see like the modules might be at fault. Either our SoC or the components used by Laird within the module. So maybe Laird can check the modules (do some Failure Analysis) since they might have data related to it's testing etc. If not, we can also try to do some failure analysis for the same, but I would suggest waiting for response from Laird.

For DFU, you would require a good RF output power/reception. And you would also require a good clock. Other than that I am not sure what else is required. Could you tell us how many units are affected? Have you tried replacing the module from a bad one onto a good unit (just to confirm that it's the module's fault) ?

-Priyanka

RE: Debugging possible HW Issue with DFU

Henry Dang — Fri, 09 Dec 2022 14:06:56 GMT

We have checked for faults on the board but not much can be check for the module since these are BGA.

We have contacted Laird and I'm waiting for their responses but meanwhile, what could cause this issue? as my impression is that DFU is purely software and once we can see BLE transmission, this would naturally work as well.

RE: Debugging possible HW Issue with DFU

Priyanka — Fri, 09 Dec 2022 07:02:07 GMT

Hi,

Since other units work fine, it could be some faulty connections or soldering issue too. Have you checked for these on your board? Also, have you tried contacting the Laird support for the same?

-Priyanka

RE: Debugging possible HW Issue with DFU

Henry Dang — Thu, 08 Dec 2022 16:02:35 GMT

That is correct. All the units that we have are using Laird modules and most can run DFU just fine

RE: Debugging possible HW Issue with DFU

Priyanka — Thu, 08 Dec 2022 12:38:56 GMT

Hi,

Do you see this on all units which use the Laird module? i.e. you say that some units are faulty, so are the others which are not faulty also using the Laird module?

Best Regards,

Priyanka