This is an example program for a PIC16F627 microcontroller that integrates keyboard input, LED display, EEPROM access, and I2C communication. The code has been debugged and is ready to be shared with beginners who are learning embedded systems. The program includes the following key features: - A simple keyboard interface using two buttons (UP and DOWN) for channel selection. - An LED display system that shows the selected channel on both high and low segments. - EEPROM storage for saving the selected channel and other configuration data. - I2C communication with an external device (e.g., a frequency synthesizer or RF module). Here’s a breakdown of the main sections: **Register Definitions:** - I/O pin mappings for SDA, SCL, LED control, and button inputs. - Memory locations for storing LED values, channel settings, and EEPROM addresses. - Flags for tracking button presses and I2C communication status. **Initialization:** - Setup of the oscillator, I/O ports, and timer for timing functions. - EEPROM check to determine if it's the first boot or a previous configuration exists. **Main Loop:** - Continuous loop for checking button presses and updating the display. - Handling of UP/DOWN button actions to change the channel. - Saving the new channel to EEPROM after a change. **I2C Communication:** - Functions for starting and stopping the I2C bus. - Sending data over I2C to an external device. - Acknowledgment checks to ensure successful communication. **LED Display:** - Code for displaying the current channel on a 7-segment LED display. - Functions to update the high and low segments based on the selected channel. **Keyboard Debounce:** - Implementation of a debounce routine to prevent false button triggers. - Detection of long and short button presses for different actions. **EEPROM R/W:** - Subroutines for reading from and writing to the EEPROM. - Ensuring data integrity by checking write operations. **Delay Function:** - A custom delay function used for timing purposes in the program. This example is ideal for educational purposes and provides a solid foundation for building more complex embedded systems with the PIC16F627. It demonstrates how to integrate multiple peripherals and manage user input effectively. Whether you're a beginner or an experienced developer, this code offers valuable insights into microcontroller programming and hardware interfacing. If you're looking to expand this project, consider adding more buttons, implementing a menu system, or integrating additional sensors and displays. The core structure provided here can serve as a strong base for further development.
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