a bit late on doing a first actual commit but here we are, it's almost done, at least in terms of the gui framework

src/main.c

@@ -7,7 +7,180 @@
  *--------------------------------------
 */
 
+#include <string.h>
+#include <ti/getcsc.h>
+#include <ti/screen.h>
+#include <sys/lcd.h>
+
+const uint16_t color_blue   = 0x001F;
+const uint16_t color_lblue  = 0x0FFF;
+const uint16_t color_grey   = 0xDDDD;
+const uint16_t color_white  = 0xFFFF;
+const uint16_t color_black  = 0x0000;
+const uint16_t color_red    = 0xF800;
+const uint16_t color_yellow = 0xFFE0;
+
+
+uint16_t* vram = (uint16_t*)lcd_Ram;
+
+void drawRect(uint16_t bgcolour, int x1, int y1, int x2, int y2) {
+    int y = y1;
+    while (y < y2) {
+        int linestart = LCD_WIDTH * y + x1;
+        vram[linestart] = bgcolour;
+        memcpy(vram+1+linestart, vram+linestart, 2*(x2-x1)-2);
+        y++;
+    }
+}
+
+const int font_height = 13;
+const int font_width  = 10;
+const int grid_height = 18;
+const int grid_width  = 32;
+void displayChar(char* text, uint16_t bgcolour, uint16_t fgcolour, int posx, int posy) {
+    os_SetDrawBGColor(bgcolour);
+    os_SetDrawFGColor(fgcolour);
+    uint8_t kerning = (font_width - os_FontGetWidth(text)) / 2;
+    if (kerning >= font_width) { kerning = 0; }
+    os_FontDrawText(text, posx*font_width + kerning, posy*font_height);
+}
+
+void displayString(char* string, uint16_t bgcolour, uint16_t fgcolour, int posx, int posy) {
+    size_t i = 0; 
+    char character[] = {0,0};
+    while (string[i]) {
+        character[0] = string[i];
+        displayChar(character, bgcolour, fgcolour, posx+i, posy);
+        i++;
+    }
+
+}
+
+void dialogBG(char* title, char* version, char* caption) {
+    drawRect(color_blue, 0, 0, 320, 240);
+    displayString(title, color_blue, color_lblue, 0, 0);
+    displayString(version, color_blue, color_lblue, 28, 0);
+    displayString(caption, color_blue, color_lblue, 0, 1);
+    drawRect(color_lblue, 2, 28, 318, 30);
+}
+
+void dialogFG(int heighttiles, int widthtiles, char* title, int shadowdist) {
+    int titlelength = strlen(title);
+    int height = heighttiles * font_height;
+    int width  = widthtiles  * font_width;
+    int cornerx = (LCD_WIDTH  - width  - shadowdist) / 2;
+    int cornery = (LCD_HEIGHT - height - shadowdist) / 2;
+    drawRect(color_black, cornerx + shadowdist, cornery + shadowdist + 39, LCD_WIDTH - cornerx, LCD_HEIGHT - cornery);
+    drawRect(color_grey, cornerx, cornery + 39, LCD_WIDTH - cornerx - shadowdist, LCD_HEIGHT - cornery - shadowdist);
+    int textx = (grid_width  - titlelength ) / 2;
+    int texty = (grid_height - heighttiles) / 2 + 3;
+    displayString(title, color_grey, color_blue, textx, texty);
+}
+
+int selected = 1;
+bool okCancel = true;
+bool update = true;
+bool go = false;
+int key = 0;
+
+void option(int id, char* name, int posx, int posy) {
+    int fgcolour;
+    int bgcolour;
+    if (id == selected) {
+        fgcolour = color_white;
+        bgcolour = color_blue;
+    } else {
+        fgcolour = color_black;
+        bgcolour = color_grey;
+    }
+    char character[] = {0,0};
+    character[0] = "0123456789"[id];
+    drawRect(bgcolour, posx*font_width, posy*font_height, (posx + strlen(name) + 2)*font_width, (posy + 1)*font_height);
+    displayChar(character, bgcolour, color_red, posx, posy);
+    displayString(name, bgcolour, fgcolour, posx + 2, posy);
+}
+void okCancelButton(bool isok, int posx, int posy) {
+    uint16_t fgcolour;
+    uint16_t bgcolour;
+    uint16_t bracketcolour;
+    if (isok == okCancel) {
+        fgcolour = color_yellow;
+        bgcolour = color_blue;
+        bracketcolour = color_white;
+    } else {
+        fgcolour = color_black;
+        bgcolour = color_grey;
+        bracketcolour = color_black;
+    }
+    char* str = "      ";
+    if (isok) {
+        str = "  OK  ";
+    } else {
+        str = "Cancel";
+    }
+    drawRect(bgcolour, posx*font_width, posy*font_height, (posx + 8)*font_width, (posy + 1)*font_height);
+    displayChar("<", bgcolour, bracketcolour, posx, posy);
+    displayString(str, bgcolour, fgcolour, posx+1, posy);
+    displayChar(">", bgcolour, bracketcolour, posx+7, posy);
+}
+
+void dialogHandleInputs() {
+    key = os_GetCSC();
+        if ((key == sk_Left) || (key == sk_Right)) {
+            okCancel = !okCancel;
+            update = true;
+        }
+        if (key == sk_Up) {
+            selected -= 1;
+            update = true;
+        }
+        if (key == sk_Down) {
+            selected += 1;
+            update = true;
+        }
+        if (key == sk_Enter) {
+            go = true;
+        }
+        if (selected > 9) {
+            selected = 0;
+        }
+        if (selected < 0) {
+            selected = 9;
+        }
+}
+
+int mainMenu() {
+    dialogBG("HelpMii", "v0.1", "Wii Linux Support Program");
+    dialogFG(14, 25, "Main Menu", 10);
+    selected = 1;
+    update = true;
+    go = false;
+    key = 0;
+    selected = 1;
+    okCancel = true;
+    while (!go) {
+        if (update) {
+            option(1, "Join the Discord",    5,  7);
+            option(2, "Read the Guide",      5,  8);
+            option(3, "Upload support logs", 5,  9);
+            option(9, "About HelpMii",       5, 10);
+            option(0, "Quit",                5, 11);
+            okCancelButton(true,   6, 14);
+            okCancelButton(false, 16, 14);
+            update = false;
+        }
+        dialogHandleInputs();
+    }
+    return selected;
+}
+
 int main(void)
 {
+    os_FontSelect(os_SmallFont);
+
+    mainMenu();
+    
+    while (!os_GetCSC());
+    os_ClrHomeFull();
     return 0;
 }