String manipulation with CCS

[Ralf2]

Many thanks for helping PCM Programmer

I want to create a table of integers and character string in rom to access them from the main().

Regards

[PCM programmer]

The test program below displays the following output in MPLAB Simulator
for compiler vs. 5.026:

[Ttelmah]

Apologies for the earlier syntax error.

As a comment, treat the pointer as an array.

If you declare the pointer as normal, but then use:

fred[index++]

rather than updating fred itself, it will access the elements.

Why, I don't know, but in CCS the equivalence between pointers and an array, does not work, when dealing with ROM variables.

If you look at the code, it is more difficult to access the ROM (remember that this is not directly accessible using an instruction like RAM, there has to be a 'lookup', and transfer of the data to RAM), so some 'limitations' are not surprising....

[Ralf2]

Thanks PCM Programmer and Ttelmah for help me.

If, the use of pointers to data stored in rom is confused and unclear with ccs
So ask the question in forum

[Ttelmah]

Very true.

They have added extra abilities (and in some cases unfortunately 'lost' abilities), with the documentation 'poor'.

The one thing that was a 'cracker', which worked a while ago, then became faulty (haven't yet checked it in 026), was 'addressmod'. This allowed you to use variables in any memory (EEPROM, FLASH, or the internal ROM etc.), and provided you remembered the memories limitations on 'write life', use them as if they were in RAM. Allowed you to have a 'near ROM' type of data which was changed infrequently, and was retained until changed.

CCS have improved a little recently on the overall reliability of the compilers, with fewer 'new bugs' appearing with each release, but still does require you to do some 'juggling' in how you handle things if you are not to generate problems. Pointers give problems even in RAM, if complex types are used (structures inside structures, and go a little 'deep' for example), and declaring an array of pointers, with variable length strings, requires the * syntax in the length parameter, in RAM, and has sometimes been unreliable. KISS, is a good way to work in CCS, even if other designs may look much more elegant, they are more likely to lead to problems....