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1. #Mplab xc8 migration issues and limitations upgrade
2. #Mplab xc8 migration issues and limitations code

Here we don’t have to specify high_priority, but if we want to we can. The same goes for the high interrupt: void interrupt isr_high (void) Will need to be changed to: void interrupt low_priority isr_low( void ) Void isr_low( void ) // called every 10ms

#Mplab xc8 migration issues and limitations code

This means we’ll need to change our high and low interrupt code in main.c. Encoding of the service routines also differs The definitions of interrupt vectors and service routines when using MPLAB XC8 is dif-įerent to those applicable for MPLAB C18. State the signedness of char types when you define them._ĭoes this mean we need to change all our char variable initiations to signed char? We’ll skip that for now and keep it in mind for when our code behaves erratical. The type of a plain char is _signed char on MPLAB C18 (unless the -k option is used), but unsigned char on MPLAB XC8. XC8 will now automagically include the correct header for our target device based on the device we set in the project option. This means in main.c and in can18F66K80.c we’ll remove the line #include and add #include instead. Separate assembly modules should include the header to access SFRs by name._ Likely you will need to include this header in all your C source modules. MPLAB XC8 uses the header file _ for all device specific information and it is

This means that the result of expressions using the smaller types canīe different to those obtained from the same code compiled with MPLAB C18. Short, char and structure bit-fields) being promoted to either signed int or Obtained from this compiler will always be consistent with the smaller data types (i.e. The MPLAB XC8 compiler cannot mimic this non-standard behavior. Section 3.4 Integer Promotions has this to say: In XC8 this option is no longer available, and integer promotion has become standard compiler behaviour. I had an issue with integer promotion behaviour in C18 before, and had to set the option to automatically promote operations to integer.

#Mplab xc8 migration issues and limitations upgrade

We’ll skip C18 compatibility mode, and do a proper code upgrade to the XC8 compiler.

I’ll be following the Migration Guide throughout this article to migrate my code, so if you want you can follow along. Microchip has described the process in their MPLAB C18 to XC8 C Compiler Migration Guide. Upgrading Mespelare firmware to XC8 Posted on: 07-01-2015 Categories: Electronics, VSCP, Drafts Author: David SteemanĪs the C18 compiler is no longer supported by Microchip and the rest of the VSCP group has migrated their code to XC8, I needed to migrate my Mespelare firmware as well.