Uploaded main files
Added main GrainOS, license and documentation files.
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295
GrainOS.ino
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295
GrainOS.ino
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#include <WiFi.h>
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struct File {
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String name;
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String content;
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bool used;
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};
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const int MAX_FILES = 10; //file limit
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File files[MAX_FILES];
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void clearScreen() {
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for (int i = 0; i < 50; i++) {
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Serial.println(); //function that clears your screen (again this is stupid)
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}
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}
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void listFiles() {
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Serial.println("Files:");
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for (int i = 0; i < MAX_FILES; i++) {
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if (files[i].used) { //FUNCTION THAT MAKES LS WORK
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Serial.println("- " + files[i].name);
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}
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}
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}
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void writeFile(String name, String content) {
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for (int i = 0; i < MAX_FILES; i++) {
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if (!files[i].used) {
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files[i].name = name; //function that writes to file
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files[i].content = content;
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files[i].used = true;
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Serial.println("File written: " + name);
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return;
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}
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}
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Serial.println("Error: No space left in RAM!");
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}
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void readFile(String name) {
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for (int i = 0; i < MAX_FILES; i++) {
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if (files[i].used && files[i].name == name) {
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Serial.println("Content of " + name + ": " + files[i].content); //function that reads written files
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return;
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}
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}
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Serial.println("Error: File not found!");
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}
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void deleteFile(String name) {
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for (int i = 0; i < MAX_FILES; i++) {
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if (files[i].used && files[i].name == name) {
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files[i].used = false; // Marks files as deleted
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Serial.println("Deleted file: " + name);
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return;
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}
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}
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Serial.println("Error: File not found!"); // WAH WAH WAH
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}
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void showHelp() { //I think this is fairly self explanatory, but still, making sure. It's just the guts of the `help` command
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Serial.println("Available commands:");
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Serial.println(" clear - Clears the screen");
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Serial.println(" echo <message> - Prints the message");
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Serial.println(" format(\"text,text,text\") - Formats input");
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Serial.println(" write <filename> <content> - Writes content to a file");
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Serial.println(" read <filename> - Reads and prints the content of a file");
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Serial.println(" delete <filename> - Deletes a file");
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Serial.println(" ls - Lists all files");
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Serial.println(" help - Displays this help message");
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Serial.println(" calc <number> <operator> <number> - calculates command");
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Serial.println(" run <script.gs> - Runs a script file");
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Serial.println(" loop <number> <command> - Loops a command the inputted amout of times");
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Serial.println(" high <pin-number> - sets the inputted pin to high");// 12
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Serial.println(" low <pin-number> - sets the inputted pin to low"); //13
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}
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void calculate(String input) {
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int firstSpace = input.indexOf(' ');
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int secondSpace = input.indexOf(' ', firstSpace + 1); // this is likely not the best way to do this as It takes up a *lot* of space, but hey. It works. I'll see If I keep It.
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if (firstSpace == -1 || secondSpace == -1) {
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Serial.println("Usage: calc <number> <operator> <number>");
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return;
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}
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String num1Str = input.substring(0, firstSpace);
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String op = input.substring(firstSpace + 1, secondSpace);
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String num2Str = input.substring(secondSpace + 1);
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float num1 = num1Str.toFloat();
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float num2 = num2Str.toFloat();
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float result;
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if (op == "+") {
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result = num1 + num2;
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}
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else if (op == "-") {
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result = num1 - num2;
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}
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else if (op == "*") {
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result = num1 * num2;
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}
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else if (op == "/") {
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if (num2 == 0) {
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Serial.println("Error: Division by zero");
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return;
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}
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result = num1 / num2;
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}
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else {
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Serial.println("Error: Unknown operator. Use +, -, *, or /");
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return;
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}
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Serial.println(String(result));
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}
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void runScript(String name) { //script interpreter!
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if (!name.endsWith(".gs")) {
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Serial.println("Must end with .gs!");
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return;
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}
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for (int i = 0; i < MAX_FILES; i++) {
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if (files[i].used && files[i].name == name) {
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Serial.println("Running script: " + name);
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String content = files[i].content;
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content.replace("\\n", "\n");
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int start = 0;
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while (start < content.length()) {
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int end = content.indexOf('\n', start);
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if (end == -1) end = content.length();
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String command = content.substring(start, end);
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command.trim();
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Serial.print("Extracted Command: [");
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Serial.print(command);
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Serial.println("]");
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if (command.length() > 0) {
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Serial.println("> " + command);
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processCommand(command);
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}
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start = end + 1;
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}
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return;
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}
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}
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Serial.println("Error: No script found.");
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}
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void loopCommand(String input) {
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int firstSpace = input.indexOf(' ');
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if (firstSpace == -1) {
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Serial.println("Use `help`");
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return;
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}
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String numStr = input.substring(0, firstSpace); // loop command !
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String command = input.substring(firstSpace + 1);
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int times = numStr.toInt();
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if (times <= 0) {
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Serial.println("Must be positive number");
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return;
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}
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for (int i = 0; i < times; i++) {
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processCommand(command);
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}
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}
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void setPinLow(String input) {
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int pin = input.toInt();
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if (pin >= 0) {
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pinMode(pin, OUTPUT);
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digitalWrite(pin, LOW);
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Serial.println("Pin " + String(pin) + " set to LOW");
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} else {
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Serial.println("Invalid pin number");
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}
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}
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void setPinHigh(String input) {
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int pin = input.toInt();
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if (pin >= 0){
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pinMode(pin, OUTPUT);
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digitalWrite(pin, HIGH);
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Serial.println("Pin " + String(pin) + " set to HIGH");
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} else {
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Serial.println("Invalid pin number");
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}
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}
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void processCommand(String input) {
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input.trim();
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if (input == "clear") {
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clearScreen();
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}
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else if (input.startsWith("echo ")) {
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String message = input.substring(5);
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message.trim();
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Serial.println(message);
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}
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else if (input.startsWith("format(") && input.endsWith(")")) {
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input = input.substring(7, input.length() - 1);
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input.replace("\"", "");
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input.replace(",", " ");
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Serial.println(input);
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}
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else if (input.startsWith("write ")) {
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int space = input.indexOf(' ', 6);
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if (space != -1) {
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String name = input.substring(6, space);
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String content = input.substring(space + 1);
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writeFile(name, content);
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} else {
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Serial.println("use `help`");
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}
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}
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else if (input.startsWith("read ")) {
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String name = input.substring(5);
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readFile(name);
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}
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else if (input.startsWith("delete ")) {
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String name = input.substring(7);
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deleteFile(name);
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}
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else if (input == "ls") {
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listFiles();
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}
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else if (input == "help") {
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showHelp();
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}
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else if (input.startsWith("calc ")) {
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calculate(input.substring(5));
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}
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else if (input == "cat"){
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Serial.println(" /\\_/\\");
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Serial.println("( o.o )");
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Serial.println("/> ^ <\\");
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}
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else if (input.startsWith("loop ")) {
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loopCommand(input.substring(5));
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}
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else if (input.startsWith("high ")) {
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setPinHigh(input.substring(5));
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}
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else if (input.startsWith("low ")){
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setPinLow(input.substring(4));
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}
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else if (input.startsWith("send ")){ // sends UART messages (pin 1) exclusive
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String message = input.substring(5);
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message.trim();
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Serial1.println(message);
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Serial.println("Sent '" + message + "'");
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}
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else {
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Serial.println("Unknown command " + input); //changed this because I realized It makes more sense
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}
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}
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void setup() {
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Serial.begin(9600);
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delay(500);
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Serial.println("Welcome to GrainOS 1.8.3, `help` for a list of commands");
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Serial1.begin(9600, SERIAL_8N1, -1, 1);
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}
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void loop() { //the script runner :)
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if (Serial.available()) {
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String input = Serial.readStringUntil(' \n');
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input.trim();
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if (input.startsWith("run ")) {
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String scriptName = input.substring(4);
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runScript(scriptName);
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} else {
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processCommand(input);
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}
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}
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}
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21
LICENSE
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21
LICENSE
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MIT License
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Copyright (c) 2025 Dangrain
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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53
README.md
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53
README.md
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# Usage tutorial
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For a most basic overview, you can always type `help` in the terminal, but not all commands are shown there due to memory restrictions.
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# General terminal commands
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`help` will display the help menu which will tell you about *most* commands.
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`echo` will print anything you write behind it right back to the terminal - Usage input: `echo <text>`, output: `<text>`
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`clear` will clear the terminal of any existing text on It, `clear` command doesn't take any arguments - Usage input: `clear`
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`format` will format any string(s) you write behind It - Usage `format("<text", "<text>", "<text>")`, output: `<text> <text> <text>`
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`loop` will loop any command behind It for the specified amount of times - Usage `loop <number> <command>`
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`calc` will calculate any two numbers specified and with the operation you specified - Usage `calc <number> <operation> <number>`, output: `<result>`
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(And a secret command `cat`, which prints a cute little kitty to your terminal! :) prrr lol)
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# File manipulation commands
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`write` will write to a file - Usage input: `write <filename> <content>`, takes `\n` as sign to move to a new line, useful for scripts!
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`read` will read from a file as long as It exists - Usage input: `read <filename>`, output: `<content>`
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`ls` will list all existing files - Usage input: `ls`, output: `Files - ...`
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`delete` will delete the specified file as long as It exists - Usage input `delete <filename>`
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# Hardware commands
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`high` will set the specified pin to high - Usage input: `high <pinnumber>`
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`low` will set the specified pin to low - Usage input: `low <pinnumber>`
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`send` will send the specified message as UART on pin 2
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# G-Script run command
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`run` will run any G-Script files specified - Usage input: `run <scriptname.gs>`
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# G-Script usage
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G-Script is very simple and is a way of automating commands within files. Essentially It just bundles commands and executes them in the order that they were typed in.
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To let the system know that you are writing a G-Script file, It has to end with the .gs suffix. To run a G-Script file utilize the `run` command.
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