How can I save some data to flash before the nrf51822 chip reset?

[mike zt]

I use nrf51822qfaa,s110 v8.00,keil MDK IDE. If the program is wrong,The chip will reset, I want to save some data to the FLASH area before the chip reset. What I need to do? Use pstorage or other? Who can offer an example.

[mike zt]

WHO can help me?

[Vidar Berg]

Hi, we don't have an example for this, but I'd suggest to try using the NVMC directly in your assert handler after disabling the interrupts. The flash write example shows how you can use the NVMC module.

[mike zt]

Hi,Vidar Berg now I add custom handle at below,is OK?

/*lint -save -e14 */
__WEAK void app_error_handler(uint32_t error_code, uint32_t line_num, const uint8_t * p_file_name)

{
    // On assert, the system can only recover with a reset.

#ifndef DEBUG
      NVIC_SystemReset();
#else

#ifdef BSP_DEFINES_ONLY 
      LEDS_ON(LEDS_MASK);
 #else
    UNUSED_VARIABLE(bsp_indication_set(BSP_INDICATE_FATAL_ERROR));
   
   // This call can be used for debug purposes during application development.
   // @note CAUTION: Activating this code will write the stack to flash on an error.
   //                This function should NOT be used in a final product.
   //                It is intended STRICTLY for development/debugging purposes.
   //                The flash write will happen EVEN if the radio is active, thus interrupting
   //                any communication.
   //                Use with care. Uncomment the line below to use.
   //ble_debug_assert_handler(error_code, line_num, p_file_name);
 #endif // BSP_DEFINES_ONLY

// The following variable helps Keil keep the call stack visible, in addition, it can be set to
// 0 in the debugger to continue executing code after the error check.
volatile bool loop = true;
UNUSED_VARIABLE(loop);

m_error_code = error_code;
m_line_num = line_num;
m_p_file_name = p_file_name;

UNUSED_VARIABLE(m_error_code);
UNUSED_VARIABLE(m_line_num);
UNUSED_VARIABLE(m_p_file_name);
__disable_irq();

Custom_Error_Handle();//use NVMC save data to flash.

while(loop);
#endif // DEBUG
}

[Vidar Berg]

Yes, this is what I meant. You may have to disable the softdevice as well to access the NVMC peripheral (before interrupt disable). That can potentially be a problem depending on what assert you got.