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Variable declaraton with extra in C
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I am reading some C code and came across this declaration in the program:
unsigned char serv_ctr @0x0002;
Can someone point me to documentation or explain what the "@0x0002" is for?
c embedded variable
edited 7 hours ago
Marcus Müller
36.3k363103
asked 10 hours ago
user3653645user3653645
112
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user3653645 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
$begingroup$
I am reading some C code and came across this declaration in the program:
unsigned char serv_ctr @0x0002;
Can someone point me to documentation or explain what the "@0x0002" is for?
c embedded variable
edited 7 hours ago
Marcus Müller
36.3k363103
asked 10 hours ago
user3653645user3653645
112
New contributor
user3653645 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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7
$begingroup$
I would guess that it is a compiler extension to place the variable at a specific address.
$endgroup$
– Eugene Sh.
10 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
9 hours ago
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
9 hours ago
add a comment |
$begingroup$
I am reading some C code and came across this declaration in the program:
unsigned char serv_ctr @0x0002;
Can someone point me to documentation or explain what the "@0x0002" is for?
c embedded variable
edited 7 hours ago
Marcus Müller
36.3k363103
asked 10 hours ago
user3653645user3653645
112
New contributor
user3653645 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I am reading some C code and came across this declaration in the program:
unsigned char serv_ctr @0x0002;
Can someone point me to documentation or explain what the "@0x0002" is for?
c embedded variable
c embedded variable
edited 7 hours ago
Marcus Müller
36.3k363103
asked 10 hours ago
user3653645user3653645
112
New contributor
user3653645 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 7 hours ago
Marcus Müller
36.3k363103
asked 10 hours ago
user3653645user3653645
112
New contributor
user3653645 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 7 hours ago
Marcus Müller
36.3k363103
edited 7 hours ago
Marcus Müller
36.3k363103
edited 7 hours ago
Marcus Müller
36.3k363103
36.3k363103
asked 10 hours ago
user3653645user3653645
112
New contributor
user3653645 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 10 hours ago
user3653645user3653645
112
asked 10 hours ago
user3653645user3653645
112
112
New contributor
user3653645 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor
user3653645 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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7
$begingroup$
I would guess that it is a compiler extension to place the variable at a specific address.
$endgroup$
– Eugene Sh.
10 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
9 hours ago
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
9 hours ago
add a comment |
7
$begingroup$
I would guess that it is a compiler extension to place the variable at a specific address.
$endgroup$
– Eugene Sh.
10 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
9 hours ago
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
9 hours ago
7
7
$begingroup$
I would guess that it is a compiler extension to place the variable at a specific address.
$endgroup$
– Eugene Sh.
10 hours ago
$begingroup$
I would guess that it is a compiler extension to place the variable at a specific address.
$endgroup$
– Eugene Sh.
10 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
9 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
9 hours ago
1
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
9 hours ago
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
9 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
This is to specify an absolute address to place the variable at.
From the XC8 compiler manual page 27, section 2.5.2 Absolute Addressing:
Variables and functions can be placed at an absolute address by using
the__at()construct
......
2.5.2.2 DIFFERENCES
The 8-bit compilers have used an @ symbol to specify an absolute address
answered 9 hours ago
Eugene Sh.Eugene Sh.
7,7781830
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1 Answer
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$begingroup$
This is to specify an absolute address to place the variable at.
From the XC8 compiler manual page 27, section 2.5.2 Absolute Addressing:
Variables and functions can be placed at an absolute address by using
the__at()construct
......
2.5.2.2 DIFFERENCES
The 8-bit compilers have used an @ symbol to specify an absolute address
answered 9 hours ago
Eugene Sh.Eugene Sh.
7,7781830
$endgroup$
add a comment |
$begingroup$
This is to specify an absolute address to place the variable at.
From the XC8 compiler manual page 27, section 2.5.2 Absolute Addressing:
Variables and functions can be placed at an absolute address by using
the__at()construct
......
2.5.2.2 DIFFERENCES
The 8-bit compilers have used an @ symbol to specify an absolute address
answered 9 hours ago
Eugene Sh.Eugene Sh.
7,7781830
$endgroup$
add a comment |
$begingroup$
This is to specify an absolute address to place the variable at.
From the XC8 compiler manual page 27, section 2.5.2 Absolute Addressing:
Variables and functions can be placed at an absolute address by using
the__at()construct
......
2.5.2.2 DIFFERENCES
The 8-bit compilers have used an @ symbol to specify an absolute address
answered 9 hours ago
Eugene Sh.Eugene Sh.
7,7781830
$endgroup$
This is to specify an absolute address to place the variable at.
From the XC8 compiler manual page 27, section 2.5.2 Absolute Addressing:
Variables and functions can be placed at an absolute address by using
the__at()construct
......
2.5.2.2 DIFFERENCES
The 8-bit compilers have used an @ symbol to specify an absolute address
answered 9 hours ago
Eugene Sh.Eugene Sh.
7,7781830
answered 9 hours ago
Eugene Sh.Eugene Sh.
7,7781830
answered 9 hours ago
Eugene Sh.Eugene Sh.
7,7781830
answered 9 hours ago
Eugene Sh.Eugene Sh.
7,7781830
7,7781830
add a comment |
add a comment |
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7
$begingroup$
I would guess that it is a compiler extension to place the variable at a specific address.
$endgroup$
– Eugene Sh.
10 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
9 hours ago
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
9 hours ago