CodeVisionAVR

3.21 Hints

In order to decrease code size and improve the execution speed, you must apply the following rules:

•If possible use unsigned variables;

•Use the smallest data type possible, i.e. bit and unsigned char;

•The size of the bit variables, allocated to the program in the Project|Configure|C Compiler|Code Generation|Bit Variables Size list box, should be as low as possible, in order to free registers for allocation to other global variables;

•If possible use the TINY memory model;

•Always store constant strings in FLASH by using the flash keyword;

•After finishing debugging your program, compile it again with the Stack End Markers option disabled.

3.22 Limitations

This version of the CodeVisionAVR C compiler has the following limitations:

•arrays of structures or unions can have only one dimension

•for the EVALUATION version the size of the compiled code is limited;

•the Philips PCF8563, Philips PCF8583, Maxim/Dallas Semiconductor DS1302, DS1307, 4x40 character LCD functions are not available in the EVALUATION version.