[En-Nut-Discussion] SJA1000

[Petri Hyötylä]

Quoting Ole Reinhardt <ole.reinhardt at embedded-it.de>:

> Hi,
>
> please try out the attached sja1000.c. I corrected the ID settings for
> standard 11Bit ID frames. If it works better I'll checkin the file to
> the CVS.
>
> Sorry... I never notices this bug because I always use 29bit IDs.
>
> Bye,
>
> Ole Reinhardt
>
> --
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a couple of tests

1) Debugger sends std and receives ext
Seems to me like the ethernut shifts bits left 18 bits.

sent        received        sent bits       received bits
0x400       0x10000000      00 0000 0000    1 0000 0000 0000 0000 0000  
0000 0000
0x200       0x08000000      010 0000 0000   0 1000 0000 0000 0000 0000  
0000 0000
0x100       0x04000000      001 0000 0000   0 0100 0000 0000 0000 0000  
0000 0000

0x080       0x02000000      000 1000 0000   0 0010 0000 0000 0000 0000  
0000 0000
0x040       0x01000000      000 0100 0000   0 0001 0000 0000 0000 0000  
0000 0000
0x020       0x00800000      000 0010 0000   0 0000 1000 0000 0000 0000  
0000 0000
0x010       0x00400000      000 0001 0000   0 0000 0100 0000 0000 0000  
0000 0000

0x008       0x00200000      000 0000 1000   0 0000 0010 0000 0000 0000  
0000 0000
0x004       0x00100000      000 0000 0100   0 0000 0001 0000 0000 0000  
0000 0000
0x002       0x00080000      000 0000 0010   0 0000 0000 1000 0000 0000  
0000 0000
0x001       0x00040000      000 0000 0001   0 0000 0000 0100 0000 0000  
0000 0000

2) Debugger sends ext and receives std
Seems to me like the ethernut shifts bits right 21 bits

sent          received sent bits                                    
received bits
0x10000000    0x080    1 0000 0000 0000 0000 0000 0000 0000        000  
1000 0000

0x08000000    0x040    0 1000 0000 0000 0000 0000 0000 0000        000  
0100 0000
0x04000000    0x020    0 0100 0000 0000 0000 0000 0000 0000        000  
0010 0000
0x02000000    0x010    0 0010 0000 0000 0000 0000 0000 0000        000  
0001 0000
0x01000000    0x008    0 0001 0000 0000 0000 0000 0000 0000        000  
0000 1000

0x00800000    0x004    0 0000 1000 0000 0000 0000 0000 0000        000  
0000 0100
0x00400000    0x002    0 0000 0100 0000 0000 0000 0000 0000        000  
0000 0010
0x00200000    0x001    0 0000 0010 0000 0000 0000 0000 0000        000  
0000 0001

7FF standard id from ethernut is received as 000 by the debugger.

--
Petri