Control the gp_led light on the board with the Linux command

Control the gp_led light on the board with the Linux command

is found on a website, here we can see gp_led is connected with GPIO3. As for GPIO13, in this picture, with gp_led does not matter, but why in the blink draft, but can control gp_led, this left in the next post. This is mainly through the control of the GPIO3 to achieve the gp_led of the light.

Is the process of gp_led from boot to control.

1. Enter the Gpio directory

2, through the LS command can be seen in the Gpio directory of each Gpio port, found here Gpio3

3, enter the Gpio3 directory

4,cat direction View the port direction of the Gpio3, as this is the driving LED lights, the port direction needs to be set to out. You can change the direction of the port by directing Echo in (out) > Direction.

5, through Echo 1 (0) > Value to control the Gpio3 output high and low level. The specific phenomenon please gp_led on the Kanban board. Other Gpio ports can also be operated by this method.