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Breakpoint impossible to define

Hello there,
I start a thread cause I'm stuck in my development and it seems that I cant define breakpoint any more. My microcontroller is a stm32f101c8t6. I used to work on the Keil model based on the stm32f103ze and I never had any problem. Is there a limitation (i know that the number of breakpoints can vary but in my case I cannot event put only one breakpoint). I did not find what to do in the RM0008, thats why I'd be pleased that someone helps me.
Thanks in advance

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  • I found my mistake, in the debugger settings (debug tab) I checked the download option "Download to flash" and when I do that breakpoints are not available on the C code, only on the assembly. When it is unchecked, everything works as usual (I can put a breakpoint on a C file).
    I wondering why cannot I download the code to flash to use breakpoints ?
    Thanks in advance