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How to know if PIC uses Hardware or software UART

 
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glenjoy



Joined: 18 Oct 2004
Posts: 21

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How to know if PIC uses Hardware or software UART
PostPosted: Thu Mar 17, 2005 9:57 am     Reply with quote
How can I know if CCS C on my PIC uses hardware or software UART.

Another thing, if I have this code:

#ISR_EXT
{
PORT_A = 0xFF;
}

main()
{
PORT_A =0x00;
}

What will happen if the interrupt is triggered, and what will happen after the ISR is done.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Mar 17, 2005 10:39 am     Reply with quote
Quote:
How can I know if CCS C on my PIC uses hardware or software UART.

This question was answered recently. See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=22149


Quote:
What will happen if the interrupt is triggered, and what will happen after the ISR is done.

See the following thread which has a demo program for INT_EXT
with lots of explanations and comments.
http://www.ccsinfo.com/forum/viewtopic.php?t=17041
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Thu Mar 17, 2005 12:27 pm     Reply with quote
if this is your main

Code:
main()
{
PORT_A =0x00;
}



The PIC will goto sleep. You need something like
Code:
main()
{
  PORT_A =0x00;

  while(1)
  {
  }
}
glenjoy



Joined: 18 Oct 2004
Posts: 21

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PostPosted: Thu Mar 17, 2005 8:08 pm     Reply with quote
Mark wrote:
if this is your main

Code:
main()
{
PORT_A =0x00;
}



The PIC will goto sleep. You need something like
Code:
main()
{
  PORT_A =0x00;

  while(1)
  {
  }
}


When testing the code without while(1);, the microcontrolelr seems to reset when tested in proteus.
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