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Audio Recording and Playback Using Direct Memory Access and Core Independent Peripherals AN3548
Introduction
1 Features
1 Theory of Operation
1.1 Analog-to-Digital Conversion (ADC)
1.2 Digital-to-Analog Conversion (DAC)
2 Memory Organization
2.1 Data Memory Organization
2.2 Internal Program Memory Organization
2.3 External Memory Organization
3 Data Transfer Operations
3.1 Data Transfer from ADC to Ping-Pong Buffers
3.2 Data Transfer from Ping-Pong Buffers to External Memory
3.3 Data Transfer from Ping-Pong Buffers to Internal Memory
3.4 Data Transfer from External Memory to DAC
3.5 Data Transfer from Internal Memory to DAC
3.6 Data Transfer from ADC to DAC (Passthrough)
4 Switch Debouncing
5 Application Setup
5.1 CPU Setup
5.2 TMR0 Setup
5.3 ADCC Setup
5.4 DAC1 Setup
5.5 SPI1 Setup
5.6 DMA Setup
5.7 PWM1 Setup
5.8 CMP1 Setup
5.9 TMR2/4 Setup
5.10 CLC1/2 Setup
5.11 TMR6 Setup
5.12 TMR1 Setup
5.13 UART1 Setup
6 Software Implementation
6.1 Setup, Main Loop and Idle Subroutine
6.2 Record Subroutine
6.3 Playback Subroutine
6.4 Erase Subroutine
6.5 Passthrough Subroutine
7 Hardware Implementation
7.1 Hardware Setup Using Curiosity Nano Evaluation Kit
7.2 Mic Click Board™ and Microphone Circuit
7.3 Power Amplifier
8 Conclusion
9 References
10 Revision History
The Microchip Website
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