Custom firmware updater (dual bank) on nrf51822 + s130 ?

RE: Custom firmware updater (dual bank) on nrf51822 + s130 ?

Alex Pristenskiy — Wed, 02 Mar 2016 12:29:45 GMT

For now, I just want to try to run app at 0x1B000 from bootloader: devzone.nordicsemi.com/.../

RE: Custom firmware updater (dual bank) on nrf51822 + s130 ?

Alex Pristenskiy — Wed, 02 Mar 2016 10:57:47 GMT

Thanks.

But examples at examples\dfu\bootloader\ are for nRF51422_xxAC chip, while I'm have nRF51822_xxAA with less RAM and Flash.

Could you please explain how "forward interrupts" works internally? I.e. does sd_softdevice_vector_table_base_set() copy new interrupt vector table to default location or someting else?

Now I'm trying to implement bare minimum bootloader, where all functions are in main.c only, which:

starts itself - it works now.
starts default application - it doesn't work now, it hangs (HardFault interrupt) at sd_softdevice_vector_table_base_set(CODE_REGION_1_START) call.

http://pastebin.com/S4wt1fsn - all the bootloader code is 325 lines, it initializes UART and waits 's' char from terminal to start application at 0x1B000 (for test purposes) that already flashed aerlier. But unfortunately it doesn't work, maybe I forgot some initialization code? should I initialize s130 in bootloader if s130 softdevice present in flash ?

RE: Custom firmware updater (dual bank) on nrf51822 + s130 ?

Vidar Berg — Wed, 02 Mar 2016 10:40:32 GMT

I'd recommend downloading SDK v.11.0.0 alpha as it's already configured for the s130 2.0.0-7.alpha and includes the serial bootlaoder. Note that this example is using UART, but can be modified to use a different transport layer as long as it's reliable.

The sd_softdevice_vector_table_base_set() call is used to tell the softdevice to where the application is located. That is, where it should forward interrupts. This SV instruction is called from the bootloader before branching to the application.