Well, the title says it all.
A debugger has no magic powers here - it would have to follow the normal requirements for erasing first, then programming.
I thought that is how breakpoints are implemented in some cases (debugWire?), no? If a debugger does that to set a breakpoint, then why cannot it do that if I ask it to? (Don't have Studio installed at the moment, so I cannot try. BTW, the debugger is Atmel-ICE. Well, and I want to do that on a SAMD; so I guess technically I'm in a wrong forum.)
I think that the debug module in the MCU includes breakpoint registers that generate a break when the PC matches.
Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net
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This holds for at least some AVRs: The hardware debug module has 4 breakpoint registers. One is reserved for single stepping. When the three others are used for breakpoints then further breakpoints will be done by writing BREAK instructions to flash. Each hit of such a breakpoint results in one flash rewrite of the original instruction, a step over it and a rewrite of the BREAK instruction.
All this out of memory, but we have had threads here in the past where Atmel people have confirmed this scheme.
So, technically it is possible for an ICE debugger to write to flash while debugging.
Whether it is possible for a Studio user to use it (and an ICE debugger) to write to flash is dependent on if the Studio developers implemented this in the UI. I don't beleive they did.
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