Queries on DFU over UART flow control

[beemavishnu]

Hello,

 

I am using nRF52840, SDK_16.0.0, S140 SoftDevice and Segger 4.16 for flashing the image.

 

1) While upgrading over serial interface using DFU, whether UART needs all 4 wires (Tx, Rx, RTS, CTS) with flow control or even without flow control whether we can do DFU over serial interface.

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_nrf5_v16.0.0%2Fsdk_app_serial_dfu_bootloader.html&cp=6_1_4_4_4

Whether can I disable flow control ?

2) To enter into bootloader mode do we need to always press button and the reset. Similar to Buttonless DFU for Bluetooth, even if UART whether we can enter into UART without any button.

Thanks & Regards

Vishnu Beema

[Simonr]

Hi

1. We don't have a buttonless example using UART DFU, but you should be able to modify it to signal the bootloader to enter DFU mode by using a UART command. You can check out this thread where my colleague explains various ways to enter bootloader mode. You can make a UART command that tells your device to do this in order to enter the bootloader.

2. With a non-connectable device, I still think you should be able to enter DFU mode using UART for example, as UART doesn't require devices to be connected over BLE to communicate. But you will not be able to enter DFU mode over BLE like in the buttonless example if you can't connect to the device.

Best regards,

Simon

[beemavishnu]

Hi Simon,

Still do I need to disable below macro in pca10056.h. But I could not fine any usage of this macro.

#define HWFC           true

Thanks & Regards

Vishnu Beema