usart config at runtime

[Guest]

I am trying to change the usart configuration (PIC16F913) at run time
reading the new settings from a register.
I can modify the baud rate but not the parity.
Here the function I use.
How can I do it ?


void configUart(void)
{
unsigned char br_n = 0;
unsigned char pr_n = 0;

br_n = reg[BR_ADDR] ;

pr_n = reg[PAR_ADDR] ;

switch (pr_n)
{
case 0:
#use rs232(parity=n,xmit=PIN_C6,rcv=PIN_C7,bits=8,enable=PIN_C5,errors)
break;
case 1:
#use rs232(parity=e,xmit=PIN_C6,rcv=PIN_C7,bits=8,enable=PIN_C5,errors)
break;
case 2:
#use rs232(parity=o,xmit=PIN_C6,rcv=PIN_C7,bits=8,enable=PIN_C5,errors)
break;
default:
#use rs232(parity=e,xmit=PIN_C6,rcv=PIN_C7,bits=8,enable=PIN_C5,errors) // Default Parity Even
}

switch (br_n)
{
case 0:
set_uart_speed (4800);
break;
case 1:
set_uart_speed (9600);
break;
case 2:
set_uart_speed (19200);
break;
case 3:
set_uart_speed (28800);
break;
case 4:
set_uart_speed (33600);
break;
case 5:
set_uart_speed (57600);
break;
default:
set_uart_speed (9600); // Default Baud Rate 9600
}
}

[Alex N]

Is it enough for your task to make some output streams with different settings and switch between them at runtime?

[gian793]

After calling my function I need to make output streams and also to read from uart. I think there's something wrong in using #use rs232 statement but...

[PCM programmer]

The #use rs232() statement creates one instance of the CCS
library code, based on the parameters that you specify.
It doesn't change parameters at runtime in a single instance
of the code, which is what you're hoping it does.

[Guest]

o.k the code I have written was wrong.
Any suggest to cope with the problem of changing the parity at run time?
Can I write a routine that do it?
The only way is to avoid getc() and putc() functions and handle the uart registers directly?

[Alex N]

This is a similar topic:
http://www.ccsinfo.com/forum/viewtopic.php?t=22062