ARM Evaluation Board
A comprehensive evaluation and prototyping board designed for exploring the NXP CORTEX-M3 family LPC1343 microcontroller.
LPC-Link programmer and LPCXpresso software suite are used for programming and real-time debugging.
- Bootloader execution
- USB interface
- SD card support with FAT32 file system
- I2C interface
- SSP interface
- UART serial communication
- Analog-to-Digital Converter (ADC)
- LCD display control
Evaluation Board Photo
Practical Application 1: Digital Voice Recorder
The ARM board implements real-time audio recording. Audio streams are captured and written to a 4GB SD card in standard WAV format on FAT32. Microphone audio passes through an amplifier and low-pass filter directly into the ARM ADC. The ADC runs at 22,050 Hz sampling rate with 8-bit resolution, while recording status is displayed on the LCD.
After stopping recording, the SD card is read on PC. Below is the audio waveform captured by the device:
Practical Application 2: Digital Reverberator (Echo Effect)
Another application implemented on the board is a digital reverberator. A single mono ADC channel samples at 22,050 Hz with full 10-bit resolution. Echo delay is bounded by internal LPC1343 RAM (8 KB), storing ~150 ms of audio data—sufficient to create a distinct repeating echo by mixing delayed signal with input.
