Can I use parameters in kbhit() function?

[curtis]

Hi all,

I have two STREAMS in my project with 18F252, one is by hardware and the other is by software implemented with fgetc() and fputc().

#use rs232 (..., stream = output232) // hardware
#use rs485 (..., stream = output485) // software

In my code I'm using # int_rda.

kbhit(output 232) ; Can I use it? I mean, Can I use a parameter in this function?

This worked well in my code with baudrate 19200.
But It couldn't work well when I changed the baud rate.

thanks

Vitor

[SherpaDoug]

Yes it works. That is how you tell kbhit() what stream to look at.
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[dyeatman]

other than the stream parameter what other parameter do you want to use. What do you mean by "it didn't work when I changed the baud rate". Was it changed in the USE statement or on the fly?

[Guest]

I used the parameter in my code even the CCS manual don't mention anything about that.

I tested it with 19200 bauderate in the USE statement and it worked well, but when I changed the baudrate in the USE statement it didn't worked.

[dyeatman]

What version of the manual are you using? It is documented in the July 2003 version in multiple places (USE RS232, Getc(),Putc(),Fputc() etc).

Post the code showing the initial USE RS232 setup and where you are changing the baudrate so we can see what you are doing.

[Mark]

You should post a test of the problem. Are you using the kbhit() inside the interrupt?

[curtis]

My manual is version July 2003, but in the page 108 the function KBHIT() is written "none" for parameters.

Follows my code:

#int_RDA

void read_RS232(void)
{
int cont232 = 0;
long timeout = 0;

restart_wdt();

disable_interrupts(INT_RDA);
disable_interrupts(INT_ext);

// Get 8 bytes
while ( cont232 < 8 )
{

// Wait maximum +/- 5000 us
while ( (!kbhit(OUTPUT232)) && (++timeout<500)){
delay_us(10);
restart_wdt();
}

// Get byte if available
if (kbhit(OUTPUT232)) {
RX232[cont232++] = fgetc(OUTPUT232);
}
// Case no, timeout
else
{
size232 = 0;
received232 = FALSE;

enable_interrupts(INT_EXT);
enable_interrupts(INT_RDA);
enable_interrupts(global);

restart_wdt();
return;
}
}

// If no TIMEOUT
size232 = cont232;
RX232[cont232] = '\0';

enable_interrupts(INT_ext);
enable_interrupts(global);

received232 = TRUE;

restart_wdt();
}



Usart Configuration:


void adjustBaud(void) {
long value;

value = read_eeprom(92);

#USE RS232 (BAUD=19200, XMIT=TX2, RCV=RX2, parity=n, bits=8, stream=OUTPUT485)
#USE RS232 (BAUD=19200, XMIT=PIN_C6, RCV=PIN_C7, parity=n, bits=8, stream=OUTPUT232)

switch(value) {
case 1:
set_uart_speed(9600, OUTPUT232);
break;
case 2:
set_uart_speed(4800, OUTPUT232);
break;
}

}

[Haplo]