RE: I can't provision nrf52840 Dongle

Daniel O'Neill — Tue, 27 Sep 2022 09:39:35 GMT

Hi Carlos,

I recently had a different issue caused by the same thing and I ended up creating a python script that created a hex file with 0xff in all positions not programmed. This effectively overwrites all data in these regions including the provisioning data and should allow you to get going.

I have since also found the suggestion here (https://devzone.nordicsemi.com/f/nordic-q-a/44727/nrf52840-dongle-erase-provisioning-data) but I don't know if that works for you.

My code for creating the blank data is below. It is kinda crude and you need to sort the boundaries yourself. It could be polished a lot more but I only needed it once! When I loaded it info nRF programmer it reported back any issues that it had which made debug cycle faster. Take the output and save it as text in a *.hex file.

I hope this helps,

Daniel

def calc_checksum(data):
    sum_val = 0
    for i in range(0, len(data), 2):
        sum_val += int(data[i:i+2], 16)
    sum_val = sum_val % 256
    checksum_val = (~ sum_val + 1) % 256
    checksum = f"{checksum_val:02X}"
    return checksum


def add_line(byte_count, address, data_string, sc=":", record_type=0):
    # sc = ":"  #start code
    # bc = 2**4  # byte count
    # addr = 2**4
    # rt = 0  # record type
    # # data_string = f"{255:02X}" * bc
    # data_string = "87050000910500009B05000000000000"
    hex_line = f"{sc}{byte_count:02X}{address:04X}{record_type:02X}{data_string}"
    cs = calc_checksum(hex_line[1:])
    hex_line += cs + '\n'
    return hex_line


def create_block(start_address, length):
    base_address = int(start_address / 2**16)
    start_address -= base_address * 2**16
    hex_lines = ""
    hex_lines += add_line(2, 0, f"{base_address:04X}", record_type=4)
    # while length > 16:
    for j in range(int(length / 16)):
        count = min(16, length)
        hex_lines += add_line(count, j*16+start_address, "FF"*count)
        length -= count
    return hex_lines


file_lines = ""
file_lines += create_block(0x34A00, 0xB600)
file_lines += create_block(0x40000, 0x10000)
file_lines += ":00000001FF"  # end of file

print(file_lines)

RE: I can't provision nrf52840 Dongle

Carlos Galiana — Mon, 26 Sep 2022 14:28:18 GMT

I need an answer please!