Segger Embedded Studio loops in softdevice

Question

Hi, 
 My project cannot be debugged using Segger Embedded Studio. The debugger doesn't halt at the application main and instead keeps running. Hitting a pause shows the debugger at 'SEV' instruction at address 0x0001304A (which seems to be from softdevice). I am using the softdevice s132v5.1 and the application uses freertos similar to the HRS example in SDK. 
 Any inputs on the reason for debugger behaving so? 
 Thanks.

Vidar Berg · Accepted Answer

You can skip the crc in nrf_dfu_utils.c -> nrf_dfu_app_is_valid() by doing something like this: 
 bool nrf_dfu_app_is_valid(void)
{
 NRF_LOG_DEBUG("Enter nrf_dfu_app_is_valid");
 if (s_dfu_settings.bank_0.bank_code != NRF_DFU_BANK_VALID_APP)
 {
 // Bank 0 has no valid app. Nothing to boot
 NRF_LOG_DEBUG("Return false in valid app check");
 return false;
 }

#ifndef SKIP_INTEGRITY_CHECK
 // If CRC == 0, the CRC check is skipped.
 if (s_dfu_settings.bank_0.image_crc != 0)
 {
 uint32_t crc = crc32_compute((uint8_t*) CODE_REGION_1_START,
 s_dfu_settings.bank_0.image_size,
 NULL);

 if (crc != s_dfu_settings.bank_0.image_crc)
 {
 // CRC does not match with what is stored.
 NRF_LOG_DEBUG("Return false in CRC");
 return false;
 }
 }
#endif //SKIP_INTEGRITY_CHECK

 NRF_LOG_DEBUG("Return true. App was valid");
 return true;
} 
 
 Note that compile time flags to skip CRC check were added in SDK 15. You could implement the same in SDK 14 ( flags to skip CRC in SDK 15 ).

Segger Embedded Studio loops in softdevice

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