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ST-Link not working after sysclk is lowered

songgee
Associate
Posted on September 10, 2012 at 09:40

Hi,

I am having an issue with ST-LinkV2 on a STM32L-discovery board not communicating with the IAR debugger after the system clock is lowered. In my code, I started off with the sysclk at 4.194Mhz (using the MSI), and then I break the execution, and changed a variable (var1) which changes the clock to run at 65khz, and then continue running the code.. After a few seconds, when I tried to break again, the IAR debugger will not respond, until I unplug the USB cable..

Any advice how to handle this case, I need to be able to debug when clock is changed..

if (var1 == 1)

{

  

RCC_MSIRangeConfig(

RCC_MSIRange_0

);  // changes clock to 65khz

   var1 = 0;

}

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