Brandon Fosdick wrote:
> Physically the setup involves two proto boards each with a 16F877,
> MCP2510 and UC5350. One of them also has a MAX232 hooked to the USART
> for displaying debugging text. The two boards are seperated by about 6
> inches of wire that makes up the CAN bus. I connected CANH to CANH and
> CANL to CANL with a 150 Ohm resistor across the wires. Not sure what
> else to do.

I forgot to mention that I'm using the OSC2/CLKOUT from the 16F877 to
provide the OSC1 signal for the MCP2510. The P16F877 is using a 4MHz
oscillator (SG531P).

This morning I broke out my trusty oscilloscope and found that CLKOUT
doesn't look quite the same as whats coming from the oscillator. The
oscillator is generating a signal that ranges from +-2.5V while CLKOUT
only does +-1V. Then I looked at the OSC2 on the MCP2510 and its just
noise. So, I rewired it so that the oscillator is fed directly to both
the 16F877 and the MCP2510. Now OSC2 on the MCP2510 is happy (+-0.5V)
but the two devices still can't talk to each other.

Any ideas why the output signal is so much smaller than the input signal
for both chips?

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