MCP2515 with NRF51-DK

RE: MCP2515 with NRF51-DK

Ree Wang — Sun, 04 Mar 2018 04:18:10 GMT

Dear Lalit Kumar,

I am working on nRF52840 Preview DK with a Arduino CAN Bus shield which using MCP2515.

Do you think it will work with your library?

Kind regards!

Lalit Kumar — Wed, 23 Sep 2015 10:42:58 GMT

Hi, your 5th point was the answer. Figured it out the hard way by putting delays. Learned that error check is important. Thanks for the reply.

MartinBL — Wed, 23 Sep 2015 10:40:45 GMT

No they are not. Maximum voltage is specified in the Product Specification as Vdd.
This should not be a problem.
This is no problem either.
I'm not sure if I understand what you mean by this, but you decide what address in the MCP2515 you want to read from by sending a read instruction followed by a byte containing the address in the MCP2515 that you want to read from. From the MCP2515 datasheet 12.3. From the data sheet: Next, the data stored in the register at the selected address will be shifted out on the SO pin.
My bet is that you are trying to transfer data too rapidly. I.e. the SPI is busy transferring data when you tell it transfer more data. The SPI transfer function spi_master_send_recv() will return the error code NRF_ERROR_BUSY if this is the case.