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int open(const char *pathname, int flags); opens the CAN device for following operations.
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Parameters:
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pathname
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device pathname, usual /dev/can? |
flags
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is one of O_RDONLY , O_WRONLY or O_RDWR which request opening the file read-only, write-only or read/write, respectively.
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The open call is used to "open" the device. Doing a first initialization according the to values in the /proc/sys/Can file system. Additional an ISR function is assigned to the IRQ.
The CLK OUT pin is configured for creating the same frequency like the chips input frequency fclk (XTAL).
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Returns:
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open return the new file descriptor, or -1 if an error occurred (in which case, errno is set appropriately).
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ERRORS
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the following errors can occur
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ENXIO the file is a device special file and no corresponding device exists. -
EINVAL illegal minor device number -
EINVAL wrong IO-model format in /proc/sys/Can/IOmodel -
EBUSY IRQ for hardware is not available -
EBUSY I/O region for hardware is not available
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