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STM32F334 bootup issue with HSI oscillator.

Question asked by Manu Abraham on Jan 29, 2017
Latest reply on Jan 30, 2017 by Manu Abraham



On a STM32F334 breakout board which is derived off the discovery board,

attached schematics and crystal side board layout and test code.


I am having troubles getting it running.


Programmed the F334 breakout board with the F407 discovery board's onboard STLINK.


I can successfully erase and download to the target F334 flash without problems.


Debugging the unexpected outcome, the thought of an oscillator startup problem with the HSE,

made me look at the HSI oscillator.


But with HSI also, the test code to blink a LED fails. I was of the thought that the HSI should

not fail unlike HSI


Any ideas how to proceed further in debugging the issue ?