Starting with Raisonance standard code for starting HSE (see any of their examples) I have added an 'else' statement to their 'if' statement to go back to using the HSI if it fails. Inside the 'else' statement I use much the same code (PrefetchBuffer, SetLatency, HCLKConfig, etc.), but can't get past the 'while(RCC_GetSYSCLKSource() != 0x08) ;' statement, apparently because the SWS bits in the RCC_CFGR register remain set to HSI (SWS = 00 binary). Anybody know why this should be?
Regards,
H.