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I currently have a working project for the C167. I need to port this application to the st10f273. How do I convert program and setup the compiler and tools for the st10?
Ask the original programmer about recommendations when porting the code.
The standard rule is of course to know both processors. The quality of the documentation for the older processor will decide how many hidden secrets that there may be lurkin in the code that will show up and bite.
With good separation between hardware mapping and business logic, it's normally quite easy to port code when moving to a different processor - assuming that the new processor can be seen as a super-set of the older processor and doesn't miss some important hardware functionality that is critical to the function of the original code.
And both toolsets.
Also helps if you have a good understanding of microcontrollers & 'C' programming in general.
And a good understanding of the application in question.