Hi Vitaliy,

The problem didn't come from the driver time, although it was an issue 
that needed to be fixed :)

The problem came from the simple fact that the receiver had a frequency, 
while I was thinking it had another... It was running at 1MHz, because I 
forgot to set OSCCON register for internal oscillator and to enable PLL, 
and I was thinking that it was at 32 MHz, and so I had the wrong values 
for the BAUD control registers in CAN module. Once I fixed this problem, 
CAN went smoothly. Now I'm able to receive every message without any 
problem, without termination resistors, at 40kb/sec. I think I might be 
able to run up to 1km at this speed and without termination resistors, 
right ?

Regards,

*Lucian Copat
*


Vitaliy wrote:

>From: "Lucian Copat"
>  
>
>>Thank you Ake for your posts !
>>
>>I think I found the problem, but remains to test this. I read now in the
>>MCP2551 datasheet that it has a permanent dominant detection and the
>>minimum speed is 16Kbits/sec. I was setting my speed to 10Kbits/sec. I
>>will try now with a speed greater than 16Kbits/sec.
>>
>>Thank you for the links, I will give them a look too !
>>    
>>
>
>Have you solved the problem yet?
>
>Your guess is probably correct. I remember messing with the 2551 driver, and 
>not understanding why changing the input state apparently did nothing to the 
>output. I went as far as replacing the driver, until I read the datasheet 
>and realized it won't transmit a pulse over 62.5 uS long.
>
>Vitaliy 
>
>  
>
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