I am writing a basic menu system for a TTGO-T to be able to select between different functions, I am trying to pass a multidimensional(2D) array of strings to a function(drawMenu & updateMenu). Ex: drawMenu(TFT_GREEN, 4, options);
The array is defined at compile time. It works if I specify which array inside the function
Example:
void drawMenu(uint16_t color, int stringArrLength) { tft.fillScreen(TFT_BLACK); tft.setTextColor(color, TFT_BLACK); tft.drawCentreString("TTGO - T",69,0,4); tft.setTextColor(TFT_WHITE, TFT_BLACK); for(int i=0;i<stringArrLength;i++) { if(count == i) { tft.setTextColor(TFT_WHITE, TFT_BLACK); tft.drawString("> ", 0, (20 + (20 * i)), 2); tft.setTextColor(TFT_WHITE, color); tft.drawString(options[i], 10, (20 + (20 * i)), 2); } else { tft.setTextColor(TFT_WHITE, TFT_BLACK); tft.drawString(options[i], 5, (20 + (20 * i)), 2); } } } ...But I would like to be able to have sub-menus, and not have to write new functions for each sub-menu. When I compile I get this error
cannot convert 'char (*)[25]' to 'char**' for argument '3' to 'void drawMenu(uint16_t, int, char**)'
I thought as long as you defined that it was a multi-dimensional array in the parameters the dimensions didn't matter, I may just be stupid though.
Code: #include <TFT_eSPI.h> #include <SPI.h> #include <Wire.h> TFT_eSPI tft = TFT_eSPI(); int leftButton = 0; int rightButton = 35; int count = 0; /** * NOTE: If adding more options dont forget the change the parameters for * drawMenu(); * & * updateMenu(); */ char options[4][25] = { "Triangle", "TicTacToe", "Option 3", "Change Color" }; char colors[6][25] = { "Red", "Orange", "Yellow", "Green", "Blue", "Purple" }; void setup(void) { pinMode(leftButton,INPUT_PULLUP); pinMode(rightButton,INPUT_PULLUP); tft.init(); tft.fillScreen(TFT_BLACK); drawMenu(TFT_GREEN, 4, options); } void loop() { updateMenu(4, options); } void drawMenu(uint16_t color, int stringArrLength, char **Arr) { tft.fillScreen(TFT_BLACK); tft.setTextColor(color, TFT_BLACK); tft.drawCentreString("TTGO - T",69,0,4); tft.setTextColor(TFT_WHITE, TFT_BLACK); for(int i=0;i<stringArrLength;i++) { if(count == i) { tft.setTextColor(TFT_WHITE, TFT_BLACK); tft.drawString("> ", 0, (20 + (20 * i)), 2); tft.setTextColor(TFT_WHITE, color); tft.drawString(Arr[i], 10, (20 + (20 * i)), 2); } else { tft.setTextColor(TFT_WHITE, TFT_BLACK); tft.drawString(Arr[i], 5, (20 + (20 * i)), 2); } } } void updateMenu(int stringArrLength, char **Arr) { /** * Dont need to mess with anything here */ if(digitalRead(leftButton) == 0 && count <= stringArrLength) { if(count == (stringArrLength - 1)) { count = 0; } else { count++; } drawMenu(TFT_GREEN, 4, Arr); delay(500); } /** * If right button pressed call function that matches current index(count) * * NOTE: first "option" in options Array is at index 0; or Count = 0, * the last option is at (array length - 1); b/c of string ending null char (\0). */ else if(digitalRead(rightButton) == 0) { if(count == 0)// 1st option... { triangles(); delay(5000); } else if(count == 1)// 2nd option... { } else if(count == 2) { } drawMenu(TFT_GREEN, 4, Arr);// return back to menu after call } } 
