nrf51822 died after download firmware

RE: nrf51822 died after download firmware

Susheel Nuguru — Wed, 04 May 2016 19:41:32 GMT

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

RE: nrf51822 died after download firmware

gortok — Wed, 04 May 2016 18:45:47 GMT

What did you mean by 'use nrfjprog to recover the module'. what command are you issuing?

RE: nrf51822 died after download firmware

Susheel Nuguru — Wed, 20 Jan 2016 08:22:45 GMT

Thanks for coming back to this thread and updating it with the answer. Great job.

RE: nrf51822 died after download firmware

aaa — Wed, 20 Jan 2016 01:59:34 GMT

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.

RE: nrf51822 died after download firmware

aaa — Wed, 20 Jan 2016 01:00:58 GMT

maybe you are right. but I never see this problem on other cortex M series MCU.

nrfjprog result:

C:\Program Files (x86)\Nordic Semiconductor\nrf5x\bin>nrfjprog.exe -e ERROR: Cannot connect to any nRF device. Please make sure a device is ERROR: connected to the debugger and supplied.

C:\Program Files (x86)\Nordic Semiconductor\nrf5x\bin>nrfjprog.exe --recover Recovering device. this operation might take 30s. ERROR: Cannot connect to any nRF device. Please make sure a device is ERROR: connected to the debugger and supplied.

C:\Program Files (x86)\Nordic Semiconductor\nrf5x\bin>

RE: nrf51822 died after download firmware

Susheel Nuguru — Tue, 19 Jan 2016 09:29:31 GMT

When your first line in main is power reset, then i guess the debugger is not getting enough time to lock to your device. What is the output of --recover from nrfjprog?

RE: nrf51822 died after download firmware

aaa — Tue, 19 Jan 2016 09:14:26 GMT

After several try, another BLE module died. But I find that the problem is the first line in the main loop, "NRF_POWER->RESET = 1;"

If I mark this line, than no BLE will died. But, what is the reason? Why this single command in application region will make this chip die?

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

int main(void) { NRF_POWER->RESET = 1; /* init leds and pins / gpio_init(); NRF_GPIO->OUTSET = (1 << 4); / Enable Softdevice (including sd_ble before framework */ SOFTDEVICE_HANDLER_INIT(MESH_CLOCK_SOURCE, NULL);