Example Analysis of indicator Group and three reset buttons in Arduino Yun
Xiaobian to share with you the Arduino Yun indicator group and 3 reset button example analysis, I believe most people still do not know how, so share this article for your reference, I hope you read this article after a lot of harvest, let us go to understand it!
1.4.2 Indicator lamp group
An enlarged view of the indicator lamp group is shown in Figure 1.5.
Figure 1.5 Indicator lamp group
The functions of each indicator light are as follows:
q RX: Corresponding to port 0, serial communication reception indication, flashing when receiving data;
q TX: Corresponding to port 1, serial communication transmission prompt, flashing when transmitting data;
q L13: connected to port 13, lit when port 13 is high;
WAN: Wired network connection indicator, lit when data exchange is available on the network cable;
q ON: Power indication;
q WLAN: WIFI indication, can also be used to indicate progress when Linux is reset;
q USB: indicates that the USB port is available and usually lights up after OpenWrt-Yun is fully booted.
1.4.3 3 Reset buttons
The positions of the three reset buttons are shown in Figure 1.6. This article is selected from Arduino Yun Quick Start Tutorial.
Figure 1.6 Location of the three reset buttons
The three reset buttons function as follows:
q32 U4 RST (reference number 1): used to reset the ATmega32U4 microprocessor, and its program (called Sketch in Arduino) will be re-run;
q YUN RST (label 2): Used to reset AR9331 microprocessor, resulting in Linux system restart, data in RAM will be lost;
q WLAN RST (number 3): This reset button has two functions: to restore WIFI to factory settings and to restore Linux image to factory settings. To restore the WIFI to factory design, press the button for 5 seconds, and the WLAN LED will flash for 5 seconds after releasing the button, after which the restore is complete. Resetting Linux image requires pressing a button for 30 seconds, after which all installed software and stored data are lost. Both of these resets result in a Linux system reboot.
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