BMD-200 and Atmega328p OTA upgrade

RE: BMD-200 and Atmega328p OTA upgrade

Lmagalhaes — Thu, 23 Aug 2018 11:45:57 GMT

Yes. The problem is the ability to reset the ATMega when the characters arrive. I didn't say it wasn't a fundamental part of any bootloader - I'm saying that I want to know if I can access the characters comming from the BT side, check if they're the 0x30 0x20, which is the initial communication of the optiboot bootloader. That's what I meant when I asked if you're able to inspect the data.

Again, I don't argue with the fact that the bootloader has nothing to do with the nRF.

What I am asking and is on the scope of this forum are two things:

1) Has anyone tried this with any success ? If so, would you mind sharing your experience?

2) If not, at least tell me if, when you want to make a bridge between the BT and the UART in the BMD-200, if you still have access to the data comming from both sides. In other BLE devices, you simply turn on the bridge and that's it, you'll never have access to what's comming from the BT interface nor the UART interface, making it impossible to add a condition that states "oh, if you receive 0x30 and 0x20, please make the GPIO LOW for 200ms".hence resetting the ATMega.

Again, not looking for bootloaders, only information.

Best regards,

Luís

RE: BMD-200 and Atmega328p OTA upgrade

awneil — Thu, 23 Aug 2018 09:33:01 GMT

[quote userid="73454" url="~/f/nordic-q-a/37670/bmd-200-and-atmega328p-ota-upgrade/145323"]The main problem is the ability to reset the atmega when the characters arrive[/quote]

Is it?

Why is that a problem? This would be a fundamental part of any bootloader - irrespective of what transport is used.

[quote userid="73454" url="~/f/nordic-q-a/37670/bmd-200-and-atmega328p-ota-upgrade/145323"][/quote]

when you start the bridge between UART and BT you can no longer inspect the data comming from either side?

I have no idea what you mean by that!

Einar Thorsrud is correct: the AVR bootloader part of this really has nothing to do with nRF - the AVR neither knows nor cares what is "driving" it.

If you have no experience with AVR (or any other) bootloaders, then you should certainly spend time to understand & get that working on its own without BT before adding that complication!

And that is beyond the scope of this forum.

EDIT

AIUI, OptiBoot is (essentially) what Arduino uses - so there is no shortage of support for that!

EDIT 2

https://arduino.stackexchange.com/questions/757/what-alternatives-are-there-to-the-optiboot-bootloader

RE: BMD-200 and Atmega328p OTA upgrade

Einar Thorsrud — Thu, 23 Aug 2018 08:35:54 GMT

I see. I have no experience with the optiboot bootloader, but hopefully you can get some relevant feedback from others on this forum. I expect it will need quite a bit of work in order to use it with the nRF51, as that is a very different chip.

RE: BMD-200 and Atmega328p OTA upgrade

Lmagalhaes — Wed, 22 Aug 2018 13:04:39 GMT

Hi Einar,

You can theoretically use the optiboot bootloader. I was just asking to know if anyone had tried to do this with a BT 4.x module. There are lots of people who have done upgrade OTA with BT 2.x modules, mainly the HC-05 variants, but never with any BT 4.x module. That's why I was asking around here if someone had done such a thing before.

The main problem is the ability to reset the atmega when the characters arrive, but that can be fixed through programming right ? Or when you start the bridge between UART and BT you can no longer inspect the data comming from either side?

Best regards,

Luís

RE: BMD-200 and Atmega328p OTA upgrade

Einar Thorsrud — Wed, 22 Aug 2018 12:33:51 GMT

Hi,

Do you want to update the ATMega328p from the nRF? If so, you need to look for a bootloader for the ATMega328p. AVR Freaks is a better forum for such questions as it depend more on the Atmel part than the Nordic part.