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I have bodged an Exar UART onto a DSTINIs400 board & need to use INT0 with it. As a starting point pressing a push button to create an INT to test a handler gets executed would be nice before getting into writing various UART routines. When I compile my C code, I get the warning L30: memory space overlap from c:200003H to c:200007H I'm not sure why this has happened & how do I get it working?? I am using the mon390 code to debug. Help! Thanks Trevor
Thanks for the reply. The code I have written doesn't contain anything else, I am using: void Ext_INT0 (void) interrupt 0 { counter++; } to test INT0, but I get a similar warning (with different addresses) if I change the interrupt number from 0 through to 8, implying that the first 9 are being used... Could it be something to do with mem map & vector address location, or someting else under the target options? Trevor
Looks like there is already code at your interrupt vector location. Take a look to the MAP file of your project to figure out where the code space is already used.
The code I have written doesn't contain anything else That may be the case --- but that doesn't say anything about code others have already written, and which has become part of your project one way or another. That's why it's so important to actually go and check the full linker report, i.e. the map file.
OK - discovered map file... The startup400.a51 file I am using has
?C_CPURESET?0 segment code at 200000H