A PCI bus-based CAN device driver and method

Abstract

The invention discloses a CAN equipment driving device and method based on a PCI bus. The device comprises a main control module, an FPGA module and a CAN link module which are sequentially connected;the main control module comprises a driving module, a switching equipment module, a control module and an interruption module; the driving module is used for externally inputting a first-stage instruction and a second-stage instruction to realize identification of equipment to be driven and setting of initialization parameters; the switch equipment module is used for opening or closing semaphore,a task, sending FIFO, receiving FIFO and a message queue of the CAN link module according to an externally input switch instruction; the control module is used for realizing a command word function,a reading function and a writing function operation on the CAN link module according to an externally input control instruction; and the interruption module is used for controlling the CAN link moduleto realize interruption operation on the to-be-driven equipment according to an interruption instruction input externally, thereby controlling the CAN link module to realize driving of the to-be-driven equipment.

Description

technical field [0001] The invention belongs to the field of device driving, and in particular relates to a PCI bus-based CAN device driving device and method. Background technique [0002] With the progress and rapid development of domestic information technology, domestic CPU and domestic embedded operating system are more and more widely used in industrial design. Localized chips based on the mips architecture, such as Loongson CPU, have become popular chips for localization due to their small size, fast speed, and low power consumption; domestic embedded operating systems such as the domestic embedded Ruihua operating system ReWorks are widely used, and they support Loongson, For X86, ARM7, ARM9, PowerPC and other CPU environments, the real-time response is less than 15 microseconds, the minimum configuration is less than 20K, and the MMU-based space protection capability and task migration capability. Therefore, the combination of domestic CPU and domestic embedded ope...

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Problems solved by technology

[0004] However, the writing of embedded device drivers requires developers to have a deep understanding of the kernel and a lot of kernel debugging skills. An improperly written device driver can even crash the system and cause file system damage and data loss. At the same time, Since the kernel source code of the Ruihua operating system is not open to the outside world, the kernel source code is large and intricate, resulting in difficulties in the design and development of self-developed CAN device drivers, which has become an urgent problem to be solved in the development of CAN devices

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