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Updated WEEK05

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?# Week 7: Constants in Embedded Systems: Debugging and Hacking Constants w/ 1602 LCD I2C Basics
# 📘 Week 7: Constants in Embedded Systems: Debugging and Hacking Constants w/ 1602 LCD I2C Basics
## ? What You'll Learn This Week
## 🎯 What You'll Learn This Week
By the end of this tutorial, you will be able to:
- Understand the difference between `#define` macros and `const` variables
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---
## ? Part 7: Hands-On Tutorial - Constants and I2C LCD
## 🔧 Part 7: Hands-On Tutorial - Constants and I2C LCD
### Step 1: Review the Source Code
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## ? Part 8: Debugging with GDB (Dynamic Analysis)
## 🐛 Part 8: Debugging with GDB (Dynamic Analysis)
> ? **REVIEW:** This setup is identical to previous weeks. If you need a refresher on OpenOCD and GDB connection, refer back to Week 3 Part 6.
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## ? Part 9: Understanding the Assembly
## 🔬 Part 9: Understanding the Assembly
Now that we've explored the binary in GDB, let's make sense of the key patterns we found.
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---
## ? Part 10: Hacking the Binary with a Hex Editor
## ✏️ Part 10: Hacking the Binary with a Hex Editor
Now for the fun part - we'll patch the `.bin` file directly using a hex editor!
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1. Open **HxD** (or your preferred hex editor: ImHex, 010 Editor, etc.)
2. Click **File** -> **Open**
3. Navigate to `C:\Users\assem.KEVINTHOMAS\OneDrive\Documents\Embedded-Hacking\0x0017_constants\build\`
3. Navigate to `C:\Users\flare-vm\Desktop\Embedded-Hacking-main\0x0017_constants\build\`
4. Open `0x0017_constants.bin`
### Step 16: Calculate the File Offset
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---
## ? Part 11: Converting and Flashing the Hacked Binary
## 🚀 Part 11: Converting and Flashing the Hacked Binary
### Step 21: Convert to UF2 Format
Open a terminal and navigate to your project directory:
```powershell
cd C:\Users\assem.KEVINTHOMAS\OneDrive\Documents\Embedded-Hacking\0x0017_constants
cd C:\Users\flare-vm\Desktop\Embedded-Hacking-main\0x0017_constants
```
Run the conversion command:
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The numbers are unchanged - we only patched the LCD string!
? **BOOM! We successfully changed the LCD text from "Reverse" to "Exploit" without access to the source code!**
🎉 **BOOM! We successfully changed the LCD text from "Reverse" to "Exploit" without access to the source code!**
---
## ? Part 12: Summary and Review
## 📊 Part 12: Summary and Review
### What We Accomplished
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## ? Key Takeaways
## 💡 Key Takeaways
1. **#define is text replacement** - It happens before compilation, no memory used.
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## ? Glossary
## 📖 Glossary
| Term | Definition |
| ----------------------- | --------------------------------------------------- |
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## ? Additional Resources
## 📚 Additional Resources
### I2C Timing Reference