reading com port

[wanes98]

Hello
I am connecting a device to one of the com ports.
could some one help in getting some code to communicat with a device and
read its status
I am sure there some code around...

gest regards
wayne

[Default User]

wanes98 wrote:

Hello
I am connecting a device to one of the com ports.
could some one help in getting some code to communicat with a device and
read its status
I am sure there some code around...

How you connect to a com port is completely dependent on your platform.
What works for Windows won't work for UNIX. Find a newsgroup dedicated
to your platform.

Brian Rodenborn

[Martin Ambuhl]

wanes98 wrote:

Hello
I am connecting a device to one of the com ports.
could some one help in getting some code to communicat with a device and
read its status
I am sure there some code around...

There is plenty of code around, but it is _all_ tied to specific
platforms and requires system-specific hooks. The system-specific
nature of this problem makes it unsuitable for discussion in a newsgroup
concerned with a platform-independent language like C. comp.lang.c is
such a newsgroup. You need to check newsgroups, mailing lists,
documentation, or technical support for your platform. Google is your
friend: all of www.google.com (for web searches), dir.google.com (for a
web directory), and groups.google.com (for newsgroups) could be useful.

[Thomas Matthews]

wanes98 wrote:

Hello
I am connecting a device to one of the com ports.
could some one help in getting some code to communicat with a device and
read its status
I am sure there some code around...

gest regards
wayne

Since you insist:
volatile int * const COM_STATUS_REGISTER =
(volatile int * const) 0x40000;
volatile unsigned char * const COM_RECV_REG =
(volatile unsigned char * const) 0x40004;
volatile unsigned char * const COM_XMIT_REG =
(volatile unsigned char * const) 0x40008;

const unsigned int CHAR_RECEIVED = 0x01;
const unsigned int XMIT_BUFFER_EMPTY = 0x02;

unsigned char Read_Com_Port(void)
{
while (*COM_STATUS_REGISTER & CHAR_RECIEVED == 0)
{
;
}
return *COM_RECV_REG;
}

void Send_Com_Port(unsigned char c)
{
while (*COM_STATUS_REGISTER & XMIT_BUFFER_EMPTY == 0)
{
;
}
*COM_XMIT_REG = c;
return;
}
For other variations, see: news:comp.arch.embedded.
For more appropriate help, post to a newsgroup that
deals with your platform or operating system.

--
Thomas Matthews

C++ newsgroup welcome message:
http://www.slack.net/~shiva/welcome.txt
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http://www.comeaucomputing.com/learn/faq/
Other sites:
http://www.josuttis.com -- C++ STL Library book

[Dan Pop]

In <WV*****************@newssvr31.news.prodigy.com> Thomas Matthews <Th****************************@sbcglobal.net> writes:

wanes98 wrote:

Hello
I am connecting a device to one of the com ports.
could some one help in getting some code to communicat with a device and
read its status
Since you insist:
volatile int * const COM_STATUS_REGISTER =
(volatile int * const) 0x40000;
volatile unsigned char * const COM_RECV_REG =
(volatile unsigned char * const) 0x40004;
volatile unsigned char * const COM_XMIT_REG =
(volatile unsigned char * const) 0x40008;

const unsigned int CHAR_RECEIVED = 0x01;
const unsigned int XMIT_BUFFER_EMPTY = 0x02;

unsigned char Read_Com_Port(void)
{
while (*COM_STATUS_REGISTER & CHAR_RECIEVED == 0)
{
;
}
return *COM_RECV_REG;
}

void Send_Com_Port(unsigned char c)
{
while (*COM_STATUS_REGISTER & XMIT_BUFFER_EMPTY == 0)
{
;
}
*COM_XMIT_REG = c;
return;
}

Please don't post garbage code.
For other variations, see: news:comp.arch.embedded.
What has comp.arch.embedded to do with PC programming?
For more appropriate help, post to a newsgroup that
deals with your platform or operating system.

The only sensible advice in the whole post. The term "com port" strongly
suggests a PC as the hardware platform, but the correct solution is still
heavily OS dependent.

Dan
--
Dan Pop
DESY Zeuthen, RZ group
Email: Da*****@ifh.de