mcp2518驅動調試

只有片選信號爲預先規定的使能信號時（高電位或低電位），對此芯片的操作纔有效   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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