CANINTF
mcp251x_read_2regs(spi, CANINTF, &intf, &eflag);
mcp251x_write_bits(spi, CANINTF,
mcp251x_read_2regs(spi, CANINTF, &intf1, &eflag1);
mcp251x_write_bits(spi, CANINTF, clear_intf, 0x00);