Development board mini2440 in a friendly, and with the realization of the led character device driver, and test applications. led driver realized the ioctl, read, write device methods are relatively simple, you can reference for beginners, there are five in the application command method, 0- Close the specified led 1- Open the specified led 2- access to specified led state of 3- led the state to get all 4- to set all of the led

chrdev_led_five_function\led_device.h
........................\led_device.c
........................\led_device_test.c
chrdev_led_five_function

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