Implement automatic page scaling feature with viewport adjustments

2026-02-18 09:33:44 +02:00
parent a9b3726ace
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35 changed files with 5722 additions and 0 deletions
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+# reTerminal DM4 LED Summary
+
+## Total LEDs Available: 9
+
+### User-Controllable LEDs: **2**
+
+1. **`usr-led`** - User-controllable LED
+   - Path: `/sys/class/leds/usr-led/brightness`
+   - Max brightness: 1 (on/off)
+   - Status: ✅ Controllable (may not be physically visible on all models)
+   - Control: `echo 1 | sudo tee /sys/class/leds/usr-led/brightness` (ON)
+   - Control: `echo 0 | sudo tee /sys/class/leds/usr-led/brightness` (OFF)
+
+2. **`usr-buzzer`** - User-controllable buzzer (controlled like LED)
+   - Path: `/sys/class/leds/usr-buzzer/brightness`
+   - Max brightness: 1 (on/off)
+   - Status: ✅ Controllable and confirmed working
+   - Control: `echo 1 | sudo tee /sys/class/leds/usr-buzzer/brightness` (ON)
+   - Control: `echo 0 | sudo tee /sys/class/leds/usr-buzzer/brightness` (OFF)
+   - Note: This is actually a buzzer, not an LED, but uses the same control interface
+
+---
+
+### System-Controlled LEDs: **7**
+
+These LEDs are managed by the system and typically not user-controllable:
+
+1. **`ACT`** - Activity LED (SD card activity)
+   - Path: `/sys/class/leds/ACT/brightness`
+   - Max brightness: 1
+   - Trigger: `mmc0` (blinks on SD card activity)
+   - Status: System-controlled (read-only for users)
+
+2. **`audio-pwr`** - Audio power LED
+   - Path: `/sys/class/leds/audio-pwr/brightness`
+   - Max brightness: 1
+   - Trigger: `none`
+   - Status: System-controlled (indicates audio power state)
+
+3. **`default-on`** - Virtual LED (always on)
+   - Path: `/sys/class/leds/default-on/brightness`
+   - Max brightness: 255
+   - Trigger: `default-on`
+   - Status: System-controlled virtual LED
+
+4. **`lcd-pwr`** - LCD power LED
+   - Path: `/sys/class/leds/lcd-pwr/brightness`
+   - Max brightness: 1
+   - Trigger: `none`
+   - Status: System-controlled (indicates LCD power state)
+
+5. **`mmc0`** - SD card activity LED (primary)
+   - Path: `/sys/class/leds/mmc0/brightness`
+   - Max brightness: 255
+   - Trigger: `mmc0` (blinks on SD card activity)
+   - Status: System-controlled
+
+6. **`mmc0::`** - SD card activity LED (secondary)
+   - Path: `/sys/class/leds/mmc0::/brightness`
+   - Max brightness: 255
+   - Trigger: `mmc0` (blinks on SD card activity)
+   - Status: System-controlled
+
+7. **`PWR`** - Power LED
+   - Path: `/sys/class/leds/PWR/brightness`
+   - Max brightness: 1
+   - Trigger: `default-on` (always on when powered)
+   - Status: System-controlled (indicates power state)
+
+---
+
+## Summary
+
+| Category | Count | LEDs |
+|----------|-------|------|
+| **User-Controllable** | **2** | `usr-led`, `usr-buzzer` |
+| **System-Controlled** | **7** | `ACT`, `audio-pwr`, `default-on`, `lcd-pwr`, `mmc0`, `mmc0::`, `PWR` |
+| **Total** | **9** | All LEDs in the system |
+
+---
+
+## Control Methods
+
+### User-Controllable LEDs
+
+**Both `usr-led` and `usr-buzzer` can be controlled using:**
+
+```bash
+# Turn ON
+echo 1 | sudo tee /sys/class/leds/<led-name>/brightness
+
+# Turn OFF
+echo 0 | sudo tee /sys/class/leds/<led-name>/brightness
+
+# Check status
+cat /sys/class/leds/<led-name>/brightness
+```
+
+### System LEDs
+
+System LEDs are typically read-only and controlled by the kernel/system. Attempting to control them may:
+- Be ignored by the system
+- Be overridden by system triggers
+- Require disabling system triggers first (not recommended)
+
+---
+
+## Notes
+
+1. **`usr-buzzer`** is technically a buzzer, not an LED, but uses the LED control interface
+2. **`usr-led`** may not be physically visible on all reTerminal DM4 models
+3. All LEDs require `sudo` for control (or proper udev rules/permissions)
+4. System LEDs are best left to system control for proper functionality
+
+---
+
+## Quick Reference
+
+```bash
+# List all LEDs
+ls /sys/class/leds/
+
+# Check LED status
+cat /sys/class/leds/<led-name>/brightness
+cat /sys/class/leds/<led-name>/trigger
+
+# Control user LEDs
+echo 1 | sudo tee /sys/class/leds/usr-led/brightness      # LED ON
+echo 0 | sudo tee /sys/class/leds/usr-led/brightness      # LED OFF
+echo 1 | sudo tee /sys/class/leds/usr-buzzer/brightness   # Buzzer ON
+echo 0 | sudo tee /sys/class/leds/usr-buzzer/brightness   # Buzzer OFF
+```
+
+---
+
+## Related Documentation
+
+- `LED-CONTROL-GUIDE.md` - Detailed LED control guide
+- `LED-TROUBLESHOOTING.md` - Troubleshooting LED issues
+- `FLASK-BUZZER-CONTROL.md` - Flask API for buzzer/LED control
+- `BUZZER-TEST-GUIDE.md` - Buzzer testing guide