看到了一片文章讲如何控制gpio的，先记录一下：

GPIOs and the Kernel

General Purpose Input/Outputs (GPIOs) are described in detail in Chapter 6 and in my previous articles/videos. These software-controlled input/outputs can be controlled from Linux user space using the GPIO Sysfs Interface (using a Linux shell directly or from within an executable), which enables you to activate a GPIO and set its state. For example, to activate the LED in Figure 1 using sysfs and turn the LED on/off, you can perform the following steps (as superuser):
root@beaglebone:/sys/class/gpio# ls
export gpiochip0 gpiochip32 gpiochip64 gpiochip96 unexport
root@beaglebone:/sys/class/gpio# echo 49 > export
root@beaglebone:/sys/class/gpio# ls
export gpio49 gpiochip0 gpiochip32 gpiochip64 gpiochip96 unexport
root@beaglebone:/sys/class/gpio# cd gpio49
root@beaglebone:/sys/class/gpio/gpio49# ls
active_low direction edge power subsystem uevent value
root@beaglebone:/sys/class/gpio/gpio49# echo out > direction
root@beaglebone:/sys/class/gpio/gpio49# echo 1 > value
root@beaglebone:/sys/class/gpio/gpio49# echo 0 > value
root@beaglebone:/sys/class/gpio/gpio49# cd ..
root@beaglebone:/sys/class/gpio# echo 49 > unexport
root@beaglebone:/sys/class/gpio# ls
export gpiochip0 gpiochip32 gpiochip64 gpiochip96 unexport

貌似没有C语言调用的源码，不过用这个试也可以了 ;

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