Embedded C Programming for STM32 PART – 5

Welcome to another exciting tutorial on embedded systems! 🎉

In this video, I explain how to interface a keypad matrix with the STM32F401RETx microcontroller using KEIL µVision for Embedded C programming (without HAL). You’ll learn how to scan the keypad matrix, configure GPIO pins, write Embedded C code, and simulate the project in Proteus to verify its functionality before implementing it on hardware.

🔧 What You’ll Learn:

Keypad Matrix Interfacing: How to connect and control a 4×4 keypad with STM32F401RETx.
GPIO Configuration for Rows and Columns: Configure STM32 GPIO pins for input and output.
Embedded C Programming: Step-by-step guide to writing efficient code for scanning the keypad matrix.
Proteus Simulation: Simulate the keypad inputs to ensure correct functionality before testing on hardware.

🛠️ Tools Used:

Microcontroller: STM32F401RETx
IDE: KEIL µVision (without HAL)
Simulation Software: Proteus Design Suite

📁 Resources:
Download the complete project files and Proteus simulation setup here:
https://github.com/shivakayan/Embedded-C-Programming-for-STM32
Find STM32F401RE reference manual here:
https://www.st.com/resource/en/reference_manual/rm0368-stm32f401xbc-and-stm32f401xde-advanced-armbased-32bit-mcus-stmicroelectronics.pdf

📌 Key Features of This Tutorial:

Step-by-step guide with clear visuals and detailed explanations
Live coding demonstration in KEIL µVision (without HAL)
Troubleshooting and debugging tips for common issues
Complete keypad scanning logic and simulation in Proteus

🕒 Timestamps:
00:00 – Introduction
00:07 – Internal Working of Keypad Matrix
01:03 – What is Key Debouncing?
02:44 – Schematic Diagram
03:21 – Steps for programming
04:16 – Enabling clock
04:53 – Configuring GPIO pins
09:11 – Explaining Keyscan( )
15:14 – Keyscan( ) Code development
19:10 – Writing to LED’s
20:04 – Final Code recap
20:57 – Proteus Simulation

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Happy learning and keep innovating! 🚀

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