SDK 13.0 couldn't do DFU using UART when disable flow control

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

bjorn-spockeli — Mon, 25 Sep 2017 08:43:34 GMT

The source code for nrfutil is available on our Github page, here is the link to the repository.

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

John — Mon, 25 Sep 2017 06:34:05 GMT

Bjørn Spockeli，

Could I see the code for the nrfutil on the command line about how to implent the DFU?

Our ble module is working with the WIFI module via the UART interface. So we would use the UART to do DFU and the zip package would be placed at the server,that is to say, put the zip package in the clound then send it to the wifi module through WIFI and then do DFU through UART.

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

bjorn-spockeli — Fri, 22 Sep 2017 08:17:04 GMT

Hi Alice, that is an interesting observation, which may indicate that the interface MCU(which runs the JLINK OB on the DK) might have something to do with the issue since its acts as a UART-> Virtual Com port bridge.

I am afraid that we do not have any examples for the host MCU side when it comes to serial DFU. You will have to refer to the Serial Bootloaders transport layer documentation to see the packet format, here is the link to the relevant page.

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

John — Fri, 22 Sep 2017 01:27:59 GMT

It's OK now with flow control unenabled on my board and using 9600 baud rate, but I don't know why it couldn't on the DK board with flow control unenabled. However, the bootloader wouldn't timeout if the updating fail.

I also have another question. I want to use a external MCU to update firmware of nRF52832, how does the MCU do? Is there any document or code I could refer to?

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

John — Thu, 21 Sep 2017 05:35:22 GMT

@Bjørn Spockeli：No, it still have the issue. I have test other baud rate with flow control enabled, the baud couldn't be lower than 57600. If disable flow control, it never could do the firmware update no matter what baud rate is.

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

bjorn-spockeli — Wed, 20 Sep 2017 14:53:14 GMT

Yes, I am seeing the same issue. Are you able to use 9600 with flow control enabled?

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

John — Wed, 20 Sep 2017 09:33:11 GMT

@Bjørn Spockeli：I have used 9600 baud rate, but it also couldn't update the firmware. Have you met the problem?

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

bjorn-spockeli — Wed, 20 Sep 2017 07:58:46 GMT

@alice: If you're not using flow control the you should use a low baudrate, e.g. 9600 to avoid overflowing the RX buffer of the nRF52.

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

John — Wed, 20 Sep 2017 07:07:11 GMT

I have tried other baud rate, for example 9600,19200,38400,57600 and so on, but it also couldn't update the firmware. Could you make it if disable flow control?

RE: SDK 13.0 couldn't do DFU using UART when disable flow control

Matt — Tue, 19 Sep 2017 13:08:39 GMT

Can you try baud rate 57600?