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How to use 2 UARTs at the same time (HW interrupts)??

 
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weg22



Joined: 08 Jul 2005
Posts: 91

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How to use 2 UARTs at the same time (HW interrupts)??
PostPosted: Tue Jun 20, 2006 10:52 am     Reply with quote
Hi all,

I'm using a PIC18F8722 which has two hardware interrupts. I'm just wondering what the proper way is to read in data using these 2 interrupts. I know for one hardware interrupt, it should be:

Code:

#use rs232(baud=38400, xmit=PIN_C6, rcv=PIN_C7, stream=IMU, DISABLE_INTS)

// RS232 interrupt for IMU
#int_rda
void rda_isr(void)
{
   c = fgetc(IMU);
}


but now with 2 hardware devices attached, how would I go about this...something like below maybe? I just don't know that with both interrupts defined as INT_RDA, how it will know how to go to isr when receiving data from IMU, and isr2 when receiving data from GPS.

Code:

#use rs232(baud=38400, xmit=PIN_C6, rcv=PIN_C7, stream=IMU, DISABLE_INTS)
#use rs232(baud=9600, xmit=PIN_G1, rcv=PIN_G2, stream=GPS, DISABLE_INTS)

// RS232 interrupt for IMU
#int_rda
void rda_isr(void)
{
   c1 = fgetc(IMU);
}

// RS232 interrupt for GPS
#int_rda
void rda_isr_2(void)
{
   c2 = fgetc(GPS);
}



Thanks in advance,
weg
newguy



Joined: 24 Jun 2004
Posts: 1907

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PostPosted: Tue Jun 20, 2006 11:15 am     Reply with quote
The 2 RDA interrupts have different names. If you have the PCW (windows) compiler, use the View -> Valid Interrupts tool. It comes up with two RS232 receive interrupts: RDA and RDA2.
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