Programming nRF51822 using UART/I2C

[Aashish Patel]

Hi,

We are using nRF51822 in our custom board.

nRF51822 is interfaced with a MCU using UART.

We want to load firmware image in MCU which will then flash nRF51822 via UART.

How to set nRF51822 in programming mode? what signal sequence or pin we need to use ?

I have already referenced the following : discussion on production programming

nRF51 series reference manual

Is SWD interface the only interface for programming nRF51822 ?

DFU bootloader can be used for firmware upgrade later using UART but what about initial firmware loading ?

Thanks in advance.

[Vidar Berg]

Hi,

The SWD interface is required when programming blank devices and there is unfortunately no way around it as far as I know. I would suggest to use the SWD for the initial firmware including the bootloader to enable future programming over UART.

[Aashish Patel]

Thanks for quick response.

One more thing.

Can we get/order nRF51822 chips pre-programmed with DFU bootloader ?

[Vidar Berg]

No problem. But it is not possible to order pre-programmed chips from Nordic.