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lecutus
Joined: 12 Aug 2009
Posts: 40
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| What does int filthit:3 mean? |
 Posted: Tue Mar 02, 2010 4:51 pm |
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What does int filthit:3 mean?
I was doing some code testing and wanted to see what the CANbus was bringing in. So looking at examples, I decided to check what the rxstat had in it.
rxstat is define as using the struct rx_stat.
| Code: |
struct rx_stat {
int1 err_ovfl;
int filthit:3;
int1 buffer;
int1 rtr;
int1 ext;
int1 inv;
};
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I asked the question like this:
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printf("\r\nGOT: BUFF=%U ID=%LU LEN=%U OVF=%U ", rxstat.buffer, rx_id, rx_len, rxstat.err_ovfl);
printf("FILT=%U RTR=%U EXT=%U INV=%U", rxstat.filthit, rxstat.rtr, rxstat.ext, rxstat.inv);
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I got a "error 57 , Expecting structure/union"
The offending portion was:
rxstat.buffer
and
rxstat.buffer
The above example is from EX_CAN.c
So a two fold question:
What does int filthit:3 mean? and Why does rxstat.buffer throw an error?
Thanks L. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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lecutus
Joined: 12 Aug 2009
Posts: 40
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| Posted: Wed Mar 03, 2010 10:29 am |
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Thanks I have the first part of my question answered. Now for the second part.
I got a "error 57 , Expecting structure/union" twice, concerning rxstat.buffer and rxstat.filthit.
The code I used was from one of the examples sent with the compiler, EX_CAN.c, just a cut and paste.
| Quote: |
if(can_getd(rx_id, &buffer[0], rx_len, rxstat)) //...then get data from buffer
{
printf("\r\nGOT: BUFF=%U ID=%LU LEN=%U OVF=%U ", rxstat.buffer, rx_id, rx_len, rxstat.err_ovfl);
printf("FILT=%U RTR=%U EXT=%U INV=%U", rxstat.filthit, rxstat.rtr, rxstat.ext, rxstat.inv);
printf("\r\n DATA = ");
for (i=0;i<rx_len;i++)
{
printf("%X ",buffer[i]);
}
printf("\r\n");
}
else
{
printf("\r\nFAIL on GETD\r\n");
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I did do the #include <can-18xxx8.c>. I checked the spelling of structure type and the variable that took the structure type.
So what am I missing.
Thanks
L. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Mar 03, 2010 12:48 pm |
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| Post your PIC and your compiler version. |
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lecutus
Joined: 12 Aug 2009
Posts: 40
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| Posted: Thu Mar 04, 2010 8:12 am |
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Sorry, I forgot the protocol.
I'm using PIC18F258 with PCWHD 4.079
For the record I have :
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int buffer[8],rx_len,rxstat;
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As an observation, does using can_getd implicitly make rxstat a structure if used like this:
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int1 can_getd(int32 & id, int * data, int & len, struct rx_stat & stat)
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Or should rx_stat be declared as a structure before use?
L. |
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Ttelmah
Guest
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| Posted: Thu Mar 04, 2010 9:28 am |
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No.
The declaration shown, for can_getd, has no effect at all on 'rxstat'. It makes the _pointer_ passed to the function, into a pointer to a structure of type rx_stat. Inside the function you can then access the parts using:
stat->filthit
for example, but not using the '.' notation, unless you dereference the pointer (*).
It sounds like this is where your problem actually lies....
Best Wishes |
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lecutus
Joined: 12 Aug 2009
Posts: 40
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| Posted: Thu Mar 04, 2010 1:14 pm |
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Thanks
I wish they would have mentioned that in the example. |
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Ttelmah
Guest
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| Posted: Thu Mar 04, 2010 3:11 pm |
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That is standard C.....
Best Wishes |
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