RE: How to update another chip firmware using nRF52840?

bjorn-spockeli — Mon, 04 Nov 2019 15:03:51 GMT

Hi Vasa,

once the external application has been transferred to the nRF52840, the bootloader will call nrf_dfu_validation_post_external_app_execute().

The external application will be located in BANK 1. You can find the bank 1 start address by calling nrf_dfu_bank1_start_addr() and the size of the application will be passed to nrf_dfu_validation_post_external_app_execute with the dfu_init_command_t struct.

So once you have the Bank 1 start address and the size of the external application you should be able to use the UART peripheral to transmit the firmware over to the STM32. You can use the UARTE HAL or driver directly or use the SLIP library or the Libuarte - advanced UARTE driver.

Best regards

Bjørn