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DiogoMS
Joined: 06 Sep 2011
Posts: 1
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| Interrupt Service Routine blocks microcontroller |
 Posted: Tue Sep 06, 2011 10:02 am |
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Hi everyone! I'm developing a project with pics and now I'm testing serial communication through rs232, using a pic, a max232 converter and my laptop.
The problem is simple to explain, but i don't know how to get over it and what I'm doing wrong.
When I establish a communication without using interrupts (Interrupt Service Routine), the communication works just fine. The problem is that I need to use the ISR on the main project. To test the communication with ISR, I created this simple program, but it doesn't work.
Can someone see any programming error or have any suggestion to help me solve this situation?
I'm using MPLAB IDE to develop code, using the compiler HI-Tech ANSI C Compiler.
Thanks in advance!
Here goes the code:
| Code: |
#include <htc.h>
#if defined(_16F877)
__CONFIG(UNPROTECT & XT & DEBUGDIS & LVPDIS & WDTDIS & PWRTDIS & LVPDIS & BORDIS);
#endif
void RS232Conf(void);
void DataArrival(unsigned char Data);
void interrupt rsi(void);
void RS232Tx(unsigned char Tx);
void main(void)
{
unsigned char Rx;
SYNC=0;
TX9=0;
CREN=1;
TXEN=1;
SPEN=1;
BRGH=1;
SPBRG=25;
TRISB=0;
RCIF=0;
TXIF=0;
RCIE=1;
TXIE=0;
PEIE=1;
GIE=1;
RS232Tx('h');
RS232Tx('i');
RS232Tx('!');
while(1)
{
RB3=1;
if(RCIF==1)
{
Rx=RCREG;
DataArrival(Rx);
}
}
}
void DataArrival(unsigned char Data)
{
TXREG=Data;
}
void RS232Tx(unsigned char Tx)
{
while(TRMT==0);
TXREG=Tx;
TXIF=0;
}
void interrupt rsi(void)
{
unsigned char Rx;
if(RCIF==1)
{
Rx=RCREG;
DataArrival(Rx);
}
} |
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temtronic
Joined: 01 Jul 2010
Posts: 9243
Location: Greensville,Ontario
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| Posted: Tue Sep 06, 2011 10:53 am |
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Well your first if not biggest mistake is posting your HiTech compiler problem on this forum !!
This is the CCS C compiler forum and while many of us could easily help perhaps you should ask the HiTech forum, unless of course you already have and got no help. If that's the case, buy the CCS version for your PIC and 'welcome onboard'. CCS provides TONS of working source code including several ISR programs including buffered serial I/O reoutines.!! |
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