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Linux(4)USB CAN调试笔记

内核支持: 默认情况下can在kernel driver没有被打开 ifconfig -a也拿不到can0的设备节点 , 需要改kernel的defconfig文件。 CONFIG_CAN_SLCAN=y CONFIG_CAN_DEV=y CONFIG_CAN_EMS_USB=...

读Linux那些事儿之我是USB CORE笔记（一）

1、 Usb总线： USB总线是一种轮询方式的总线。协议规定所有的数据传输都必须由主机发起， host controller初始化所有的数据传输，各种设备紧紧围绕在主机周围。 2、DMA 映射：一般来说，都是驱动里提供了 kmallo...

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