Is it possible to pass a stream to a function?

[Darren Logan]

Hello,

It is possible to pass a Stream identifier to a function?

It would save a lot of code space for me if this was possible.

Currently, I have to determine which serial port (i have 2) I need to send data out of thus (example):

void sendit(int whichport) {

if(whichport==1) {
fprintf(port1,"calling from port 1");
}

if(whichport==2) {
fprintf(port2,"calling from port 2");
}

}

what i'd really like to do is:

void sendit(int whichport) {

fprintf(whichport,"sending from port \%u",whichport);

}

What i've done doesn't work, im wondering whether a) I've done something wrong or b) You simply can't do it this way?

Answers on a postcard to "Save the ROM competition", FrustratesVille, UK

Cheers,
Darren
___________________________
This message was ported from CCS's old forum
Original Post ID: 12031

[Mark]

You could you sprintf to put the data in a string and then write out to the port of choice

or

the printf command allows you to specify a function as the first parameter. The default is putc(), however, you could make your own function in which you specify the stream and then that function outputs accordingly.


:=Hello,
:=
:=It is possible to pass a Stream identifier to a function?
:=
:=It would save a lot of code space for me if this was possible.
:=
:=Currently, I have to determine which serial port (i have 2) I need to send data out of thus (example):
:=
:=void sendit(int whichport) {
:=
:=if(whichport==1) {
:=fprintf(port1,"calling from port 1");
:=}
:=
:=if(whichport==2) {
:=fprintf(port2,"calling from port 2");
:=}
:=
:=}
:=
:=what i'd really like to do is:
:=
:=void sendit(int whichport) {
:=
:=fprintf(whichport,"sending from port \%u",whichport);
:=
:=}
:=
:=What i've done doesn't work, im wondering whether a) I've done something wrong or b) You simply can't do it this way?
:=
:=Answers on a postcard to "Save the ROM competition", FrustratesVille, UK
:=
:=Cheers,
:=Darren
___________________________
This message was ported from CCS's old forum
Original Post ID: 12034

[Darren Logan]

Mark,

Thanks. I like the sound of 2nd idea (printf) but admit to be a little under-skilled in this area.

Could you post typical code please ????

Thanks,
Darren
___________________________
This message was ported from CCS's old forum
Original Post ID: 12036

[Mark]

void myputc(char somedata)
{

if(whichport==1)
{
fputc(port1,somedata);
}
else
{
fputc(port2,somedata);
}
}

void main
{
whichport = 1;
printf(myputc,"sending from port \%u",whichport);
while(1);
}


whichport is a global in this case.


Regards,
Mark

:=Mark,
:=
:=Thanks. I like the sound of 2nd idea (printf) but admit to be a little under-skilled in this area.
:=
:=Could you post typical code please ????
:=
:=Thanks,
:=Darren
___________________________
This message was ported from CCS's old forum
Original Post ID: 12039

[Darren Logan]

Thanks Marks, much appreciated. I'll give it a whirl.

This should save a fair bit of space as currently I've got duplicate fprintf's sending the same data only out different ports.

Cheers,
Darren
___________________________
This message was ported from CCS's old forum
Original Post ID: 12051