mcp2518驱动调试

只有片选信号为预先规定的使能信号时（高电位或低电位），对此芯片的操作才有效   The SPI in the microcontroller must be configured in mode (0,0) or (1,1) in 8-bit operating mode   Spi-imx.c spi_imx 30830000.ecspi: mode_bits = 71(0x47),0100 0

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