# OLED Display Fix for 128x32 Screens

## Problem
Your OLED code was designed for larger displays (128x64) with 8 rows. Your 128x32 display only has **4 rows × 21 characters**, so the 3-row tall graphics take up most of the screen, leaving no room for useful information.

## Solution Overview
1. **Simplify graphics**: Use 1-row tall icons (single character height) instead of 3-row tall graphics
2. **Optimize layout**: Better use of the 4 available rows
3. **Update font file**: Replace oversized graphics with compact, readable icons

## New Layout for 128x32 (4 rows)
```
Row 1: [Logo] LAYER NAME
Row 2: [Icon] W-C-S  (modifiers)
Row 3: WPM:045
Row 4: CAPS  SCRL
```

## Files Modified

### 1. OLED Code (keymap.c)
Replace your current OLED functions with the compact version in:
- `oled_redesign_128x32.c` (reference implementation)

Key changes:
- **Logo**: 2 characters instead of 15 (3×5 grid)
- **Layer indicators**: 2 characters instead of 15 (3×5 grid)
- **Modifiers**: 4 single characters (W-A-C-S) instead of multi-char graphics
- **Text-based layer names**: More readable than icons
- **Efficient spacing**: Uses all 4 rows effectively

### 2. Font File (glcdfont.c)
Update these character positions with simple icons:

```c
// 0x80-0x81: Logo (2 chars)
0x3E, 0x41, 0x55, 0x55, 0x41, 0x3E,   // 0x80: Keyboard icon
0x3E, 0x41, 0x55, 0x55, 0x41, 0x3E,   // 0x81: Keyboard icon

// 0x92-0x93: Default layer (2 chars)
0x08, 0x1C, 0x3E, 0x7F, 0x2A, 0x2A,   // 0x92: Home icon
0x10, 0x38, 0x7C, 0xFE, 0x54, 0x54,   // 0x93: Home icon

// 0x94-0x95: Symbol layer (2 chars)
0x24, 0x7F, 0x24, 0x7F, 0x24, 0x00,   // 0x94: # symbol
0x24, 0x2A, 0x7F, 0x2A, 0x12, 0x00,   // 0x95: $ symbol

// 0x96-0x97: Navigation layer (2 chars)
0x08, 0x1C, 0x2A, 0x08, 0x08, 0x08,   // 0x96: Up arrow
0x08, 0x08, 0x08, 0x2A, 0x1C, 0x08,   // 0x97: Down arrow

// 0x98-0x9B: Modifier keys (1 char each)
0x66, 0x66, 0x00, 0x7E, 0x66, 0x66,   // 0x98: GUI/Windows
0x7E, 0x09, 0x09, 0x09, 0x7E, 0x00,   // 0x99: ALT
0x3E, 0x41, 0x41, 0x41, 0x22, 0x00,   // 0x9A: CTRL
0x08, 0x1C, 0x2A, 0x08, 0x08, 0x08,   // 0x9B: SHIFT (arrow)
```

## Implementation Steps

### Step 1: Update keymap.c OLED functions
Copy the redesigned functions from `oled_redesign_128x32.c` to your `keymap.c`, replacing these functions:
- `render_logo()` → `render_logo_compact()`
- `render_logo2()` → (merged into main function)
- `render_layer_state()` → `render_layer_name()` + `render_layer_icon()`
- `render_mod_status_gui_alt()` → `render_modifiers_compact()`
- `render_mod_status_ctrl_shift()` → (merged into modifiers_compact)
- `render_status_main()` → `render_status_compact()`
- `render_status_secondary()` → (use same compact function)
- `oled_task_user()` → Updated version

### Step 2: Update glcdfont.c
1. Find line ~136 where character 0x80 starts
2. Replace the hex values for characters 0x80, 0x81, 0x92-0x9B
3. Keep all other characters (0x00-0x7F for ASCII text)

### Step 3: Compile and Test
```bash
cd qmk_userspace
bash build_all.sh
```

### Step 4: Flash to Keyboard
Flash the `.uf2` files to both halves of your split keyboard.

## Customization

### Design Your Own Icons
1. Visit: https://helixfonteditor.netlify.com/
2. Each character is **6 pixels wide × 8 pixels tall**
3. Export as hex array (6 bytes per character)
4. Copy hex values to glcdfont.c

### Character Format
Each character = 6 bytes (one per column):
```
Byte format (binary): 0bDCBA9876
where 0 = top pixel, 7 = bottom pixel

Example (arrow up):
   ▄     ▄▄▄  ▄ █ ▄   ▄      ▄      ▄   
   █     ███  █ █ █   █      █      █   
= [0x08, 0x1C, 0x2A, 0x08, 0x08, 0x08]
```

### Alternative: Use Text Instead of Icons
If you prefer text-only (no custom graphics):
```c
// In render_modifiers_compact():
if(modifiers & MOD_MASK_GUI)   oled_write_P(PSTR("W"), false);
if(modifiers & MOD_MASK_ALT)   oled_write_P(PSTR("A"), false);
if(modifiers & MOD_MASK_CTRL)  oled_write_P(PSTR("C"), false);
if(modifiers & MOD_MASK_SHIFT) oled_write_P(PSTR("S"), false);
```

## Benefits of This Design

✅ **Readable**: Text layer names are clearer than multi-row icons
✅ **Efficient**: Uses all 4 rows with no wasted space
✅ **Informative**: Shows layer, modifiers, WPM, and caps/scroll lock
✅ **Compact**: Small icons fit in single row (1 char tall)
✅ **Consistent**: Same layout on both keyboard halves
✅ **Maintainable**: Simpler code, easier to modify

## Tools Provided

1. **oled_font_helper.py**: Visualize current font graphics
2. **generate_simple_icons.py**: Generate simple icon hex values
3. **oled_redesign_128x32.c**: Complete redesigned OLED code

## Next Steps

Would you like me to:
1. Apply these changes directly to your keymap.c and glcdfont.c?
2. Create a different layout design?
3. Design custom icons for specific purposes?
4. Keep some of your original graphics but optimize them?

Let me know how you'd like to proceed!