How I can get a simple to help me understand the DFU procedure that Transfer of a firmware image?

[QingF]

Hi，I want to write the firmware to 52832 from android system by UART .I have readed the firmware
into bytes, and then do not know how to compose the bytes to write into serial port.I will Appreciate
if you can show me a simple!!

Thanks!!
Best Regards!!!

[bjorn-spockeli]

HI QingF. 

we have a Serial Bootloader example in our SDK, see Secure DFU Bootloader over Serial Link (UART/USB). It uses the Secure Bootloader module and it has a serial transport layer, where the protocol is described here. 

If you want to perform the update from a PC, then you can use our nRFutil tool, see nRF Util on our Infocenter. If you want to perform the update from another MCU, then one of our FAEs ported the nrfutil serial dfu functionality to a C library see https://github.com/jimmywong2003/nrf-slim-serial-uart-dfu-host-c-code.

Best regards

Bjørn

[QingF]

Hi bjorn-spokeli:

     thanks for your answer!!

     I had seen the SDK https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.0.0%2Flib_dfu_transport_serial.html   Correspond with my nRF5_SDK_13.0.0

    and I have performed the update from a PC user the nRFutil tool: nrfutil dfu serial -pkg application.zip -p COM7 -fc 0 -b 9600  . It update successfully. The next I will do is implemented the same function as the nrfutil tool  in android system to update automaticlly.

    According to the procedure of DFU protocol ,at first: 

     1. I set the PRN to 256  and send the following content:

     byte[] PRN ={02,01,00}

   boolean isSuccessBegin = getSerialPort().SerialSendData(PRN);
   It should have a respond of [60 02 01],but I have not received any message; 
   I make sure the baudrate is corret，I can send other test commad and the 52832 reply to me successfully.
   Finally,if you have the java library ??

Thanks!

[bjorn-spockeli]

Please note that the serial bootloader in SDK v13.0.0 is considered experimental. 

Can you debug the bootloader and verify that you enter the SERIAL_DFU_OP_CODE_SET_RECEIPT_NOTIF case in on_packet_received() in nrf_serial_dfu.c?

[QingF]

I debugged as follow:

00> :INFO:Inside main
00> :DEBUG:In nrf_bootloader_init
00> :DEBUG:In real nrf_dfu_init
00> :DEBUG:running nrf_dfu_settings_init
00> :DEBUG:Enter nrf_dfu_continue
00> :DEBUG:Valid App
00> :DEBUG:Application sent bootloader request
00> :DEBUG:In nrf_dfu_transports_init
00> :DEBUG:num transports: 1
00> :DEBUG:UART initialized
00> :DEBUG:After nrf_dfu_transports_init
00> :DEBUG:Waiting for events

It's print same as send command use nRfutil tool from PC. but it has no the print of the SERIAL_DFU_OP_CODE_SET_RECEIPT_NOTIF case :

case SERIAL_DFU_OP_CODE_SET_RECEIPT_NOTIF:
NRF_LOG_DEBUG("Set receipt notif\r\n");------------------------ths line.

I also try to write the bytes of {0x02,0x00,0x00} to trigger it ,but no reponse too.

[bjorn-spockeli]

OK, do you enter the on_packet_received() handler at all when you send {0x02,0x00,0x00} ?

[QingF]

It has not enter the on_packet_received() handler yet when I  send {0x02,0x00,0x00}  ;