2 rs232 interruptions

[baraban]

Hello all,

Is it possible on a 16F8xx or 18xxxx chip to have two RS232 ports, with separate interruptions ?
I need to get data from a serial port by IT, and get data on another serial port (both on the same chip) to get data too.
But I need IT for both ! (one connected to a GPRS phone, so when someone call, I get data in the IT function, and another connected to a PC to get data at a high speed, so I need IT to avoid loosing chars).
Thanks in advance,
Regards,
Matt.
___________________________
This message was ported from CCS's old forum
Original Post ID: 7411

[Phil G]

Hi,
I just went through this:
Onthe PIC18 with 2 hardware serial ports (C6&C7, G1 & G2)
the INT_RDA is for the C6-C7 port, and INT_RDA2 is for the G1-G2 port.
Note here that kbhit() does not work for the G1-G2 port, so if you need this you need to work around by accessing the hardware diraectly:

#bit portg_kbhit = 0xFA4.5
.
.

and then instead of
if(kbhit())...
use
if(portg_kbhit)...

Phil

:=Hello all,
:=
:=Is it possible on a 16F8xx or 18xxxx chip to have two RS232 ports, with separate interruptions ?
:=I need to get data from a serial port by IT, and get data on another serial port (both on the same chip) to get data too.
:=But I need IT for both ! (one connected to a GPRS phone, so when someone call, I get data in the IT function, and another connected to a PC to get data at a high speed, so I need IT to avoid loosing chars).
:=Thanks in advance,
:=Regards,
:=Matt.
___________________________
This message was ported from CCS's old forum
Original Post ID: 7417

[KenMac]

says that value = kbhit (stream) is legal. Is this not true?

[Ttelmah]

Look at the date involved....
The problem though is that the approach is limited in speed, and I/O to the hardware UART using interrupts can then interfere with the timings of the software UART.
Using a MAX3100, a PIC with two hardware UARTs, or another really small PIC communicating via I2C/SPI, are the 'better' methods to get good reliability.

Best Wishes

[Andre Jr. Richard]

18F8722

[ALFA 705]

Hi,

be carefully with 18F8722 and others PICs family.
Microchip is working in a "bug" about their EUSART. This will resut in ERRATA.

That's all I can tell you.

ALFA 705