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nrf51822 died after download firmware

aaa

My six nrf51822 modules died after I erase flash and download "ble bcast mesh" (with sd110 8.0.0) github.com/.../nRF51-ble-bcast-mesh

At first time, I download firmware into chip, and enter debug mode, everything is good. When I leave debug mode, add some function to firmware and try to enter debug mode, I find that jlink can't find the chip anymore.

the following message is from jlink commander:

=================================================================== SEGGER J-Link Commander V5.10d (Compiled Dec 9 2015 12:49:51) DLL version V5.10d, compiled Dec 9 2015 12:49:14

Connecting to J-Link via USB...O.K. Firmware: J-Link V9 compiled Oct 9 2015 20:34:47 Hardware version: V9.30 S/N: 59304981 License(s): GDB Emulator has Trace capability VTref = 3.409V

Type "connect" to establish a target connection, '?' for help J-Link>device nrf51822_xxac Please specify target interface: J) JTAG (Default) S) SWD TIF>S Specify target interface speed [kHz]. : 4000 kHz Speed>100 Device "NRF51822_XXAC" selected.

Found SWD-DP with ID 0x0BB11477 Found SWD-DP with ID 0x0BB11477

****** Error: DAP error while reading DP-Ctrl-Stat register. Found SWD-DP with ID 0x0BB11477 Found SWD-DP with ID 0x0BB11477 Can not connect to target. Found SWD-DP with ID 0x0BB11477 Found SWD-DP with ID 0x0BB11477

=================================================================

I try "nrfjprog.exe -e", "nrfjprog.exe --recover" and nRfgo, but don't work.

rom: 0x18000 size 0x28000 ram: 0x20002000 size 0x2000

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    finally, I know the reason. the module I used has an external reset circuit: one 10K res and one 10nF in series. I connect swclk and swdio to oscilloscope and see that the rising edge of swdio is odd. After removing the cap, I can use nrfjprog to recover those module.

  • 0 in reply to aaa

    Hi gortok, I assume you know nrfjprog tool, you have to type this command in command prompt so that nrfjprog can try to recover you device. Normally when your device is programmed to go to low power modes without a wakeup source and if this happens too early then attempting to erase chip wont work, then you have to use this below command for attempting to erase chip, If it did not work even then then you have probably bricked you chip.

    nrfjprog --recover

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  • 0 in reply to aaa

    Hi gortok, I assume you know nrfjprog tool, you have to type this command in command prompt so that nrfjprog can try to recover you device. Normally when your device is programmed to go to low power modes without a wakeup source and if this happens too early then attempting to erase chip wont work, then you have to use this below command for attempting to erase chip, If it did not work even then then you have probably bricked you chip.

    nrfjprog --recover

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