topic Re: global data in S12 / MagniV Microcontrollers https://community.nxp.com/t5/S12-MagniV-Microcontrollers/global-data/m-p/206321#M8383 <HTML><HEAD></HEAD><BODY><P>I don't know Cosmic, but it seems that the problem could be related to static initialization. If you declare a variable as const it will likely end up in flash, and if ou don't declare it as const, it will likely end up in RAM. And then, if you pick a minimal non-standard startup code as is custom with most embedded compilers, the variable won't be initialized and contain garbage values.</P></BODY></HTML> Mon, 16 May 2011 18:01:19 GMT Lundin 2011-05-16T18:01:19Z global data https://community.nxp.com/t5/S12-MagniV-Microcontrollers/global-data/m-p/206320#M8382 <HTML><HEAD></HEAD><BODY><P>I am using the MC9S12Xeq512 processor as a new user. I had a problem when a c file had a global variable of type struct&nbsp;is declared. The program built ok&nbsp;using Cosmic but the app did not run.&nbsp;I changed the global to static const and all was well. The funny thing is that the global was&nbsp;only used by functions inside the file. Any ideas for this behavior.&nbsp;With this paged memory, are there rules of thumb for&nbsp;treating global and file scope variables?</P><P>&nbsp;</P><P>Thanks,</P><P>David&nbsp;</P></BODY></HTML> Sat, 14 May 2011 09:05:47 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/global-data/m-p/206320#M8382 bones 2011-05-14T09:05:47Z Re: global data https://community.nxp.com/t5/S12-MagniV-Microcontrollers/global-data/m-p/206321#M8383 <HTML><HEAD></HEAD><BODY><P>I don't know Cosmic, but it seems that the problem could be related to static initialization. If you declare a variable as const it will likely end up in flash, and if ou don't declare it as const, it will likely end up in RAM. And then, if you pick a minimal non-standard startup code as is custom with most embedded compilers, the variable won't be initialized and contain garbage values.</P></BODY></HTML> Mon, 16 May 2011 18:01:19 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/global-data/m-p/206321#M8383 Lundin 2011-05-16T18:01:19Z