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georpo
Joined: 18 Nov 2008
Posts: 281
Location: Athens, Greece.
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| search string strstr |
 Posted: Thu Apr 30, 2020 6:56 am |
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Hello,
I am using strstr to search for specific string and it works OK:
| Code: |
unsigned int8 STRCON[]={"0,CONNECT"};
unsigned int8 STRCLO[]={"0,CLOSED"};
unsigned int8 ASKAPS[]={"ASKAPS"};
if(strstr(RxBuf,STRCON)!=0) DoStuff();
else if(strstr(RxBuf,STRCLO)!=0) DoStuff1();
else if(strstr(RxBuf,ASKAPS)!=0) DoStuff2();
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The above works but if I make the strings const to save RAM I get "Attempt to create a pointer to a constant" Error.
| Code: |
const unsigned int8 STRCON[]={"0,CONNECT"};
const unsigned int8 STRCLO[]={"0,CLOSED"};
const unsigned int8 ASKAPS[]={"ASKAPS"};
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Any ideas?
_________________
George. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19538
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| Posted: Thu Apr 30, 2020 7:03 am |
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Add
#device PASS_STRINGS=IN_RAM
at the top of your code immediately after the line including the
processor definition file.
The 'reason', is because of the architecture of the PIC. It uses a
Harvard architecture, which means the program memory is a completely
separate memory 'space' to the RAM. Pointers are addresses in RAM,
and a const string (in ROM), is not in RAM. Hence a pointer cannot
be constructed to this.
This line adds a little extra code to 'virtualise' accesses to the ROM
so that pointers can be used.
Be aware this only works with compilers for the last few years (V5.). |
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