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Need help with ccstcpip.h...

 
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leejok2003
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Need help with ccstcpip.h...
PostPosted: Thu Dec 25, 2008 9:15 am     Reply with quote
Hi, recently i am do some study regarding CCS tcpip. When i look into the codes, i get stucked with these:


Code:

*0xF92=*0xF92 & 0xFC;   //a0 and a1 output
 *0xF93=*0xF93 & 0xCF;   //b4 and b5 output


What does it means with 0xF92? And where can i find them? Thanks...[/code]
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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Re: Need help with ccstcpip.h...
PostPosted: Thu Dec 25, 2008 9:42 am     Reply with quote
leejok2003 wrote:
Hi, recently i am do some study regarding CCS tcpip. When i look into the codes, i get stucked with these:


Code:

*0xF92=*0xF92 & 0xFC;   //a0 and a1 output
 *0xF93=*0xF93 & 0xCF;   //b4 and b5 output


What does it means with 0xF92? And where can i find them? Thanks...[/code]


0xF92 is the address of TRISA
0xF9B is the address of TRISB

The code is setting up a0, a1, b4 and b5 as outputs.
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FvM



Joined: 27 Aug 2008
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PostPosted: Thu Dec 25, 2008 9:48 am     Reply with quote
It's an alternative syntax for accessing PIC18 SFRs, curiously never mentioned in a CCS C manual, as far as I'm aware.

A more usual syntax would be

#byte TRISA = 0xf92
#byte TRISB = 0xf93
TRISA &= 0xFC;
TRISB &= 0xFC;
leejok2003



Joined: 25 Dec 2008
Posts: 32

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PostPosted: Thu Dec 25, 2008 9:57 am     Reply with quote
Oh...now i see...thanks guys Very Happy
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