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16f88 and Recieve Data Available Interupt

 
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dpmohne



Joined: 27 May 2004
Posts: 9

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16f88 and Recieve Data Available Interupt
PostPosted: Thu May 27, 2004 4:48 pm     Reply with quote
I am attempting to use the Recieve Data Available interupt on an 16f88 with the following code. The RDA_isr() is not being entered as far as I can tell.



Code:

#include <16F88.h>
#use delay(clock=20000000)
#fuses HS, NOLVP, NOWDT
#use rs232(baud=9600,parity=N,xmit=PIN_B5,rcv=PIN_B2,bits=8,errors)

#int_RDA
RDA_isr()
{
   output_high(PIN_B0);
   printf("%c",getc();
   output_low(PIN_B0);
}



void main()
{

   setup_adc_ports(VSS_VDD);
   setup_adc(ADC_CLOCK_INTERNAL);
   setup_spi(FALSE);
   setup_counters(RTCC_INTERNAL,WDT_18MS);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
   enable_interrupts(INT_RDA);
   enable_interrupts(global);

   while(true)
   {
   }
}


I have been I know the recieve is working, because if I move the printf() to the while loop I get a character echo.


Any Suggestions?


Thanks
Duane
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu May 27, 2004 5:15 pm     Reply with quote
What is your version of the compiler ?
The Devices.dat file for some versions did not properly
define the existence of the hardware USART in the 16F88.
dpmohne



Joined: 27 May 2004
Posts: 9

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PostPosted: Thu May 27, 2004 5:20 pm     Reply with quote
We are using version 3.174 of the compiler which definitely has the error. I edited the chip in chipedit and the problem is corrected.


Duane

Last edited by dpmohne on Thu May 27, 2004 5:36 pm; edited 1 time in total
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu May 27, 2004 5:35 pm     Reply with quote
I installed PCM vs. 3.174, and compiled a small test program
for the 16F88. The compiler does not produce code for a
hardware USART with that version. It creates code for a
software USART instead.

I then installed PCM vs. 3.191, and tested it. It works.
Code for a hardware USART is created.

So the Devices.dat file is probably incorrect for your version.

You could email CCS support and ask them to send you a
corrected Devices.dat file. Tell them your compiler version.
Maybe they will send you one.
Guest
Guest
PostPosted: Thu May 27, 2004 10:46 pm     Reply with quote
for 16F88 with 3.173, a simple fix for USART is

#use rs232( ... xmit=PIN_C6, rcv=PIN_C7 ...

then it will come out at PIN_B5 and PIN_B2,

I hope it also work for your 3.174

have fun !
prwatCCS



Joined: 10 Dec 2003
Posts: 70
Location: West Sussex, UK

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PostPosted: Fri May 28, 2004 1:54 am     Reply with quote
I would also advise against placing printf statements inside interrupt handlers. They can take a lot of time and may result in loss of character reception.
_________________
Peter Willis
Development Director
Howard Eaton Lighting Ltd UK
dpmohne



Joined: 27 May 2004
Posts: 9

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PostPosted: Fri May 28, 2004 5:18 am     Reply with quote
prwatCCS wrote:
I would also advise against placing printf statements inside interrupt handlers. They can take a lot of time and may result in loss of character reception.


Very true, I was just trying to demonstrate a problem that I had broken out from the main codebase and was working on.

Thanks,
Duane
dpmohne



Joined: 27 May 2004
Posts: 9

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PostPosted: Fri May 28, 2004 5:19 am     Reply with quote
Guest wrote:
for 16F88 with 3.173, a simple fix for USART is
#use rs232( ... xmit=PIN_C6, rcv=PIN_C7 ...
then it will come out at PIN_B5 and PIN_B2,
I hope it also work for your 3.174
have fun !


I could do that, but why when I have chipedit to fix problems like this.

Thanks,
Duane
Guest
Guest
PostPosted: Fri May 28, 2004 9:54 pm     Reply with quote
dpmohne wrote:
Guest wrote:
for 16F88 with 3.173, a simple fix for USART is
#use rs232( ... xmit=PIN_C6, rcv=PIN_C7 ...
then it will come out at PIN_B5 and PIN_B2,
I hope it also work for your 3.174
have fun !


I could do that, but why when I have chipedit to fix problems like this.

Thanks,
Duane


"chipedit" is better.

Using C6, C7 is just another way to play with CCS back to the time I didn't know how to use chipedit.

Cheers
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