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picprogrammer
Joined: 10 Sep 2003
Posts: 35
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| Change of uart |
 Posted: Wed Sep 25, 2013 7:27 am |
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My project uses UART1 with a command line interface. Now I want to use multiple pcb on a RS485 bus on UART2. The idea is to select 1 print on the RS485 bus and talk only to that one.
Is it possible to switch UART stream? The manual call if printf is used, the last #use RS232.. is active. Is this possible in the code? I have a lot of printf in my program so it would take a lot of code to fprintf for the 2 separate. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19538
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| Posted: Wed Sep 25, 2013 8:14 am |
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Encapsulate....
replace 'printf', with:
printf(my_putc, what you want to print);
You can do a simple 'search and replace' for the "printf(", and replace this with "printf(my_putc", throughout the code.
Then just create a function 'my_putc', like:
| Code: |
int1 use_first_stream=TRUE;
void my_putc(int8 chr)
{
if (use_first_stream)
fputc(STREAM1,chr);
else
fputc(STREAM2,chr);
}
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This way there is just one pair of fputc calls, with a single flag 'deciding' what stream is to be used, and you can just change 'use_first_stream' to TRUE/FALSE, to select the stream to be used.
The printf functions, instead of all calling putc, will just call the new 'decider' (my_putc) function.
Quick/easy to do, and adds the least possible code.
Best Wishes |
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picprogrammer
Joined: 10 Sep 2003
Posts: 35
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| Posted: Wed Sep 25, 2013 8:56 am |
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Yes, but like that I have to double all +/-50 printf's with a lot of float printing. The code will increase a lot.
It would be handy if STREAM1 was a variable!
Sorry, did'nt read you measage. Thanks will try! |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19538
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| Posted: Wed Sep 25, 2013 9:31 am |
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No you don't. You are missing the point...
| Code: |
//Two #use RS232's here, setting up the streams STREAM1, and STREAM2
int1 use_first_stream=TRUE;
void my_putc(int8 chr)
{
if (use_first_stream)
fputc(STREAM1,chr);
else
fputc(STREAM2,chr);
}
void main(void)
{
float value=12345.2;
int16 valuei=234;
do
{
printf(my_putc, "Something complex %f, %ld\n\r",value,valuei);
use_first_stream~=1;
value+=1;
valuei+=1;
}
while (TRUE);
}
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This will alternately print to STREAM1, then STREAM2, from the single printf as the 'use_first_stream' value changes.
Exactly what you want.
Best Wishes |
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