XMEGA NRF24L01+ Communication Project

This project demonstrates how to interface an Atmel XMEGA microcontroller with the nRF24L01+ 2.4 GHz RF transceiver using SPI communication.
It also includes utility code for USART, I²C (TWI), PWM, GPIO control, and SPI drivers.

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📂 Project Structure

• nrf24l01_.h

  • Low-level driver for the nRF24L01+ transceiver
  • Provides functions to:
    • Initialize as receiver or transmitter
    • Read/write registers
    • Load TX buffer and read RX buffer
    • Control CE/CSN pins for SPI transactions

• myFirstXmega.c

  • Main application code running on the XMEGA
  • Initializes 32 MHz clock, USART, SPI, GPIO
  • Provides helper functions for:
    • LED and button testing
    • USART TX/RX with interrupts
    • I²C routines for external sensors (e.g., MPU6050)
    • PWM generation (example at 38 kHz)
  • Demonstrates RF data transmit/receive via nRF24L01+

• MY_SPI.cpp

  • Hardware abstraction layer for SPI communication
  • Functions include:
    • spi_init(...) → Configure SPI
    • spi_write(...) → Write a byte
    • spi(...) → Full-duplex transfer
    • spi_read(...) → Read received byte

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✨ Features

• SPI communication with nRF24L01+
• Dual role: transmitter and receiver
• Interrupt-based UART communication
• Software I²C routines
• PWM generation example
• LED/button testing utilities

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🔧 Hardware

• Microcontroller: Atmel XMEGA (tested on ATxmega128A1)
• RF Module: nRF24L01+ (2.4 GHz)
• Connections:
  • SPI: MOSI, MISO, SCK, CSN, CE
  • GPIO: LEDs, buttons
  • USART: Serial debugging
  • I²C: External sensors

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git clone https://github.com/yourusername/xmega-nrf24l01.git