mirror of
https://github.com/arduino/Arduino.git
synced 2024-12-04 15:24:12 +01:00
85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
/*
|
|
Write to file using FileIO classes.
|
|
|
|
This sketch demonstrate how to write file into the Yún filesystem.
|
|
A shell script file is created in /tmp, and it is executed afterwards.
|
|
|
|
created 7 June 2010
|
|
by Cristian Maglie
|
|
|
|
This example code is in the public domain.
|
|
|
|
http://arduino.cc/en/Tutorial/FileWriteScript
|
|
|
|
*/
|
|
|
|
#include <FileIO.h>
|
|
|
|
void setup() {
|
|
// Setup Bridge (needed every time we communicate with the Arduino Yún)
|
|
Bridge.begin();
|
|
// Initialize the Serial
|
|
Serial.begin(9600);
|
|
|
|
while (!Serial); // wait for Serial port to connect.
|
|
Serial.println("File Write Script example\n\n");
|
|
|
|
// Setup File IO
|
|
FileSystem.begin();
|
|
|
|
// Upload script used to gain network statistics
|
|
uploadScript();
|
|
}
|
|
|
|
void loop() {
|
|
// Run stats script every 5 secs.
|
|
runScript();
|
|
delay(5000);
|
|
}
|
|
|
|
// this function creates a file into the linux processor that contains a shell script
|
|
// to check the network traffic of the WiFi interface
|
|
void uploadScript() {
|
|
// Write our shell script in /tmp
|
|
// Using /tmp stores the script in RAM this way we can preserve
|
|
// the limited amount of FLASH erase/write cycles
|
|
File script = FileSystem.open("/tmp/wlan-stats.sh", FILE_WRITE);
|
|
// Shell script header
|
|
script.print("#!/bin/sh\n");
|
|
// shell commands:
|
|
// ifconfig: is a command line utility for controlling the network interfaces.
|
|
// wlan0 is the interface we want to query
|
|
// grep: search inside the output of the ifconfig command the "RX bytes" keyword
|
|
// and extract the line that contains it
|
|
script.print("ifconfig wlan0 | grep 'RX bytes'\n");
|
|
script.close(); // close the file
|
|
|
|
// Make the script executable
|
|
Process chmod;
|
|
chmod.begin("chmod"); // chmod: change mode
|
|
chmod.addParameter("+x"); // x stays for executable
|
|
chmod.addParameter("/tmp/wlan-stats.sh"); // path to the file to make it executable
|
|
chmod.run();
|
|
}
|
|
|
|
|
|
// this function run the script and read the output data
|
|
void runScript() {
|
|
// Run the script and show results on the Serial
|
|
Process myscript;
|
|
myscript.begin("/tmp/wlan-stats.sh");
|
|
myscript.run();
|
|
|
|
String output = "";
|
|
|
|
// read the output of the script
|
|
while (myscript.available()) {
|
|
output += (char)myscript.read();
|
|
}
|
|
// remove the blank spaces at the beginning and the ending of the string
|
|
output.trim();
|
|
Serial.println(output);
|
|
Serial.flush();
|
|
}
|
|
|