DFU buttonless with SDK11

RE: DFU buttonless with SDK11

Hung Bui — Mon, 28 Aug 2017 09:09:12 GMT

If you plan to use a pin/button to trigger DFU, you don't have to do anything, the bootloader already supported that.

RE: DFU buttonless with SDK11

Jorge — Fri, 25 Aug 2017 07:47:04 GMT

I had to rethink on my approach and I am going to implement a pin to trigger the DFU. Thank you for your help on this

RE: DFU buttonless with SDK11

Hung Bui — Thu, 24 Aug 2017 08:52:41 GMT

Retained register will be reset if you trigger the reset pin. Please read the nRF51 Reference Manual chapter 12.

RE: DFU buttonless with SDK11

Jorge — Tue, 22 Aug 2017 12:05:35 GMT

The retention register (GPREGRET) is only kept if it is a reset from the function NVIC_SystemReset()? Or if it is a trigger on the reset pin this will also behave the same way?

RE: DFU buttonless with SDK11

Hung Bui — Tue, 22 Aug 2017 08:25:00 GMT

Have you looked at the code inside bootloader_start() and inside the bootloader ? You need to set a flag in GPREGRET retention register, before you reset, so the bootloader can check that flag and decide to enter bootloader mode or not:

err_code = sd_power_gpregret_set(BOOTLOADER_DFU_START);

RE: DFU buttonless with SDK11

Jorge — Mon, 21 Aug 2017 11:18:02 GMT

I think I confused you with my question. On my project I already have the SD130 and the bootloader (single_bank_serial_130 with a few changes). I can download my application via HCI when I have only the SD130 and BL, but if I have my app already running I cannot download a new one.

I thought I had to trigger something on my app to go to the bootloader after receiving the start packet to accomplish this.

I reset the board (using the reset pin) but it always goes to the application on the bootloader.

RE: DFU buttonless with SDK11

Hung Bui — Mon, 21 Aug 2017 10:57:03 GMT

Have you looked at the DFU project folder ? I attached in my answer above the path to the serial dfu project.

The 0xC0 is the start/stop byte , it's according to the BluetoothSpec on HCI standard. Please have a look at the documentation that I pointed to above.

I strongly suggest you to test and study the bootloader before you start modifying or developing your own bootloader. It's a pretty complex project.

RE: DFU buttonless with SDK11

Jorge — Mon, 21 Aug 2017 09:47:05 GMT

The HCI (UART) example that you mentioned is it on the SDK? I couldn't find it there, I only found the "hci_dfu_send_hex" that contains the hex files to be loaded to the boards.

I have checked the the website that you linked and from what I saw the command sequence begins then with 0xC0 can I assume that this is the Command Id for the dfu transfer?

And I have to send the 4 packets (start, init, data and stop)?

RE: DFU buttonless with SDK11

Hung Bui — Mon, 21 Aug 2017 09:01:37 GMT

We have another example with SPI that you may have a look.

RE: DFU buttonless with SDK11

Jorge — Mon, 21 Aug 2017 08:55:37 GMT

It is over I2C, the OTA will be added in the future, replacing the I2C. I will check the example then, thank you.

RE: DFU buttonless with SDK11

Hung Bui — Mon, 21 Aug 2017 08:53:21 GMT

Are you planing to use BLE to do OTA DFU ? Or you going to use I2C ? We have HCI(UART) bootloader example in the SDK.

RE: DFU buttonless with SDK11

Jorge — Mon, 21 Aug 2017 07:47:18 GMT

Thank you for the help! I have managed to change the bootloader_start() for our application.

My only problem now is that I don't know where to call it. I use a tool that sends the data over I2C so I think I need to call it from the I2C parser, but I don't know if it is generic command ID/sequence? Is there any example of dfu over hci?

RE: DFU buttonless with SDK11

Hung Bui — Fri, 18 Aug 2017 08:00:15 GMT

If you want to share bond, you need to use device manager. But if you simply want to switch to bootloader from your application, you can just follow what we did in bootloader_start() in dfu_app_handler.c to implement in your application.

RE: DFU buttonless with SDK11

Jorge — Thu, 17 Aug 2017 12:40:15 GMT

This example uses the device manager, Is there any example without this? Since I have started with the bla_app_nus example and it doesn't use the device manager functionality.

RE: DFU buttonless with SDK11

Jorge — Thu, 17 Aug 2017 11:18:18 GMT

I read somewhere that there was an example on the SDK11 but I wasn't finding it. I will check this then. Thank you

RE: DFU buttonless with SDK11

Hung Bui — Thu, 17 Aug 2017 10:59:12 GMT

Hi Jorge,

It's always suggested to use the latest SDK. But if you want to use SDK v11 , you can find the buttonless example in \examples\ble_peripheral\ble_app_hrs\pca10028\s130_with_dfu

Documentation is on info center as well.