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Variable declaraton with extra in C
Calculating a simple CRCspidev_test.c analysislocal variable resets to zeroWriting data over Serial comm //Arduino & MPU6050 gyro+accelerometerWhy using a pointer interfacing LCD HD44780LCD interfacing with msp430AVR: Interrupt build errorstack calculation in microcontrollerWhy pass pointer to register as volatile?Purpose of 2nd order filter for processing temperature measurement
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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 6 hours ago
Marcus Müller
36.3k363103
asked 8 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 6 hours ago
Marcus Müller
36.3k363103
asked 8 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.
8 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
8 hours ago
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
8 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 6 hours ago
Marcus Müller
36.3k363103
asked 8 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 6 hours ago
Marcus Müller
36.3k363103
asked 8 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 6 hours ago
Marcus Müller
36.3k363103
asked 8 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 6 hours ago
Marcus Müller
36.3k363103
edited 6 hours ago
Marcus Müller
36.3k363103
edited 6 hours ago
Marcus Müller
36.3k363103
36.3k363103
asked 8 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 8 hours ago
user3653645user3653645
112
asked 8 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.
8 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
8 hours ago
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
8 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.
8 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
8 hours ago
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
8 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.
8 hours ago
$begingroup$
I would guess that it is a compiler extension to place the variable at a specific address.
$endgroup$
– Eugene Sh.
8 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
8 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
8 hours ago
1
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
8 hours ago
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
8 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 8 hours ago
Eugene Sh.Eugene Sh.
7,7581830
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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 8 hours ago
Eugene Sh.Eugene Sh.
7,7581830
$endgroup$
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 8 hours ago
Eugene Sh.Eugene Sh.
7,7581830
$endgroup$
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 8 hours ago
Eugene Sh.Eugene Sh.
7,7581830
$endgroup$
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 8 hours ago
Eugene Sh.Eugene Sh.
7,7581830
answered 8 hours ago
Eugene Sh.Eugene Sh.
7,7581830
answered 8 hours ago
Eugene Sh.Eugene Sh.
7,7581830
answered 8 hours ago
Eugene Sh.Eugene Sh.
7,7581830
7,7581830
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.
8 hours ago
$begingroup$
Which C compiler are you using?
$endgroup$
– Dave Tweed♦
8 hours ago
1
$begingroup$
C Compiler Mplab XC8 v1.35
$endgroup$
– user3653645
8 hours ago