Connecting a WM8782 Stereo ADC Board (I2S 24-bit, 192kHz) to a DSP

This guide explains how to connect a WM8782-based I2S ADC board to a DSP board, including the I2S data lines, master clock, and power supply. It also details the necessary configuration of switches and jumpers.

Board Overview

1. Configure the DSP for I2S Input

Set up the I2S input on the DSP using SigmaStudio:

| Pin | Function | Description | |-----|------------------|----------------------------------------------------------------------------------------------------------------------------| | MP0 | Sdata_in0 | Input data — corresponds to channels 2 and 3 in SigmaStudio input block. Channels 4 and 5 go to MP1 (Sdata_in1). | | MP4 | Lrclk_in | Input left-right clock. | | MP5 | Bclk_in | Input bit clock. |

2. Connect I2S Lines

Use the following wiring between the I2S ADC board and the DSP board:

| Signal | I2S Board | DSP Board | Cable Color | |------------------|-----------|-----------|----------------------| | Data | D | MP0 | Violet | | Left-Right Clock | LR | MP4 | Gray | | Bit Clock | B | MP5 | White |

3. Connect the Master Clock

Set the I2S board as the master and the DSP board as the slave. Enable external clock mode on the DSP board.

Wire the master clock as follows:

| Signal | I2S Board | DSP Board | Cable Color | |--------------|-----------|-----------|----------------------| | Master Clock | CLK | MCLK | Orange |

4. Power Supply Connections

Supply both boards with +5V:

| Signal | I2S Board | DSP Board | Cable Color | |---------|-----------|------------------|----------------------| | GND | GND | Any GND pin | White | | +5V | +5V | +5V | Green |

5. Configure I2S Board Switches & Jumpers

Set the jumpers and DIP switches on the I2S board as follows:

• Jumper J6: M (Master Mode)
• Jumper J1: 24 (24.576 MHz)
• Jumper J2: 1/2 CLK (12.288 MHz output)

DIP Switches:

| Switch | Position | Function | |--------|----------|---------------------| | SW1 | + | Main Mode | | SW2 | 0 | I2S Protocol | | SW3 | – | 48 kHz Sample Rate | | SW4 | 0 | 24-bit Data |