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Tiva-c mcp2551 can transceiver do not work

Hello

im using an tiva-c launchpad to comunicate via CAN. I also use an mcp2551 can transceiver.

The thing is that i can not communicate because the rs and vref pins of the transceiver had the

voltage value = 2.5 V but the rs is connected with an 10K resitance to the ground and vref is not connected to anything.

Anyone knows how to solve this ?