issue uploading large file ~80KB to nrf52832 about adafruit_nrf52_bootloader HOT 6 CLOSED

issue start to happens with fe712fb

from adafruit_nrf52_bootloader.

issue does not happen if flash with segger studio, seem like some volatile or optimization things.

from adafruit_nrf52_bootloader.

only happens with arduino, doesn't happen with cpy uploading dfu-flash. Seems to be a quick serial port timeout with Arduino.
Update: flashing larger file such as bootloader still work hmm. strange !!

from adafruit_nrf52_bootloader.

Hooking it to the analyzer, it is dynamic issue with cpu blocking by nvmc operation. Basically when erasing + writing flash, the cpu is blocked --> causing the uart irq does not consume incoming data --> overwrite SLIP Start byte 0xC0 --> the whole following packet is discarded as invalid packet --> no ack at all. One of the solution could be modifying hci_slip/app_uart to use UARTE to make use of the DMA.

from adafruit_nrf52_bootloader.

further diving: seem like only nrf_nvmc_page_erase() cause issue since it block cpu for > 2ms. write words only block for few dozen us, thus isn't an issue. We can use the erase all first approach as previous version for dfu serial

from adafruit_nrf52_bootloader.

go back to erase in advance and skip erase on the fly for nrf52832. A small amount of delay (10 ms) is also added by adafruit-nrfutil after each 4KB to be safe.

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