Does this SYM file show a RAM corruption ??

arunb · Joined: 08 Sep 2003 Posts: 492 Location: India

Hi,

MCU: 16F877A
PCM 3.228

Does the following extract of .SYM file show something wrong with the RAM addresses ??

0B6 get_command.cCommand
0B6 @delay_us1.P1
0B6-0B9 interpreter.nAddrs1
0B6-0B9 processloop.nAddrs1
0B6 process_command.cCommand
0B6 process_input.@SCRATCH
0B6 execute_procedure.@SCRATCH
0B7 write_eeprom16byte.nAddress
0B7 read_eeprom_32byte.nAddress
0B7 read_eeprom16byte.nAddress
0B7 @delay_ms1.P1
0B7 get_command.@SCRATCH

are some of the locations being shared ??

thanks
arunb

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

CCS reuses the RAM locations for local variables in sub-routines.
The local variables only have to exist while the sub-routine is active.
Once the program control has returned from the sub-routine, the
RAM location can be used for the next sub-routine. This memory
allocation is determined by the compiler when it compiles your code.

However, if you declare a variable in a sub-routine to be 'static',
then the compiler will not re-use it.