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nirayo
Joined: 23 Feb 2009
Posts: 10
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| receive interrupt on pic24fj256gb110 |
 Posted: Tue Feb 24, 2009 2:15 am |
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I am trying to get data from user on pic24fj256gb110, after success in printing out, I now need to receive charecter, I have tried many things with no luck,
please help
10q,
nira |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Tue Feb 24, 2009 4:42 am |
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The built-in stdio RS232 functions are directed to UART2, other UARTs can be accessed through respective SFRs directly. Also the peripheral pins selects must be set for the respective UART IOs.
Some aspects of PIC24 UART usage have been previously discussed, see e.g.: http://www.ccsinfo.com/forum/viewtopic.php?t=36976&
Can you show your existing INT_RDA code? |
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nirayo
Joined: 23 Feb 2009
Posts: 10
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| Posted: Wed Feb 25, 2009 2:31 am |
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FvM
the example works fine, this is the basic way to see that everything works, thank you, I now know that the hardware is O.K.
I will try to write with interrupt again, (not very optimistic...)
I'll let you know hoe it goes
thanks again
Nirayo |
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nirayo
Joined: 23 Feb 2009
Posts: 10
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| Posted: Wed Feb 25, 2009 2:59 am |
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| FvM wrote: | The built-in stdio RS232 functions are directed to UART2, other UARTs can be accessed through respective SFRs directly. Also the peripheral pins selects must be set for the respective UART IOs.
Some aspects of PIC24 UART usage have been previously discussed, see e.g.: http://www.ccsinfo.com/forum/viewtopic.php?t=36976&
Can you show your existing INT_RDA code? |
here is my code:
char msg_reply[5];
#define BUFFER_SIZE 5
BYTE next_in = 0;
BYTE next_out = 0;
char done;
//========================================//
#int_rda
void get_msg_uart2()
{
int t;
msg_reply[next_in]=getc();
if(msg_reply[next_in] == 0x0d)
{
done = 1;
}
t=next_in;
next_in=(next_in+1) % BUFFER_SIZE;
if(next_in==next_out)
{
next_in=t; // Buffer full !!
}
}
it is copied from the pic compiler examples, with a few revision of my own, it's not working, I don't see that the program enters the interrupt
help!!! |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Wed Feb 25, 2009 3:27 am |
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| I just realized, I forgot to mention, UART2 IRQ uses #INT_RDA2. I guess, that's why your code doesn't work. Also enable_interrupts(INT_RDA2); has to executed. |
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nirayo
Joined: 23 Feb 2009
Posts: 10
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| Posted: Thu Feb 26, 2009 2:52 am |
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been there, done that, didn't work
I have read something in the datasheet about interrupt vector for this chip
how does this work exactly? is there some initialization I need to perform ? |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Thu Feb 26, 2009 3:15 am |
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See below my relevant code parts. Interrupt vector is setup automaticly by using the #INT_RDA2 directive.
| Code: | #use rs232(UART1,baud=38400,parity=N,bits=8)
#int_RDA2
void RDA2_isr(void)
{
BYTE bTemp;
BYTE c;
c=getc();
SRecBuf[SRecNextIn]=c;
bTemp = SRecNextIn;
// REC_BUF_SIZE must be power of two to use & mask
SRecNextIn = (SRecNextIn + 1) & (REC_BUF_SIZE-1);
if(SRecNextIn == SRecNextOut)
{
SRecNextIn = bTemp;
}
}
void main(void)
{
// Setup peripheral pin selects, should work by PCS built-in functions as well
OSCCONL = 0x46;
OSCCONL = 0x57;
IOLOCK = 0;
RPINR19L = 27; // UART2 Receive = RP27
RPOR14L = 5; // UART2 Transmit
OSCCONL = 0x46;
OSCCONL = 0x57;
IOLOCK = 1;
// ...
enable_interrupts(INT_RDA2);
enable_interrupts(INTR_GLOBAL);
// ...
} |
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nirayo
Joined: 23 Feb 2009
Posts: 10
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| Posted: Thu Feb 26, 2009 4:03 am |
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hello FvM
thank you so much for your help,
I'm sorry, but it seems you are going to have to feed me on this one.
I have looked through the datasheet, and still don't understand,
how do I define this:
OSCCONL
IOLOCK
RPINR19L
RPOR14L
thank you
nirayo
p.s. I am working on pcd 24 bit with pic c compiler ver.4.085
Last edited by nirayo on Thu Feb 26, 2009 4:43 am; edited 1 time in total |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Thu Feb 26, 2009 4:41 am |
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The said code sequence is for unlocking the peripheral pin select registers, only necessary if you intend to set them manually. I generally do this in my code, cause I experienced the PCD built-in functions with peripheral pin selects working incorrectly, at least with some pin functions and some PCD revisions back.
If your UART is basically working in non-interrupt operation, your method of setting the pins would have proved correct and you can ignore this part of my code. Otherwise, you have to use your application settings here rather than mine.
I you still don't succeed, I suggest to assemble a minimal UART I/O application that is supposed to work as is (e.g. including all initializations) and post it here.
B.T.W., does a non-interrupt UART handling work:
| Code: | void main(void)
{
printf("Here I am\r\n");
while (1)
// echo all
putc(getc());
} |
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nirayo
Joined: 23 Feb 2009
Posts: 10
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| Posted: Thu Feb 26, 2009 4:56 am |
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the basic example works just great, realy echos what i write in the terminal,
without interrupts. But I realy need the interrupts, since I am not supposed to know when the input is coming |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Fri Feb 27, 2009 11:20 am |
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| Yes I see. As I said, it's generally working (for all four UARTs). Post a complete example. |
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nirayo
Joined: 23 Feb 2009
Posts: 10
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| Posted: Thu Mar 12, 2009 4:03 am |
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thank you FvM,
I have succeeded l
got some help from another friend
turns out I needed to map all the registers manually |
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