Altera DE2-115 User Manual download pdf (Page 88)

the data input from the line-in port is then mixed with the microphone-in port and the result is sent

to the line-out port.

For this demonstration the sample rate is set to 48kHz. Pressing the pushbutton KEY0 reconfigures

the gain of the audio CODEC via I2C bus, cycling within ten predefined gain values (volume levels)

provided by the device.

Figure 6-7 Block diagram of the Karaoke Machine demonstration

 Demonstration Setup, File Locations, and Instructions

• Project directory: DE2_115_i2sound

• Bit stream used: DE2_115_i2sound.sof or DE2_115_i2sound.pof

• Connect a microphone to the microphone-in port (pink color) on the DE2-115 board

• Connect the audio output of a music-player, such as an MP3 player or computer, to the line-in

port (blue color) on the DE2-115 board

• Connect a headset/speaker to the line-out port (green color) on the DE2-115 board

• Load the bit stream into the FPGA by execute the batch file ‘DE2_115_i2sound’ under the

DE2_115_i2sound\demo_batch folder

• You should be able to hear a mixture of the microphone sound and the sound from the music

player

• Press KEY0 to adjust the volume; it cycles between volume levels 0 to 9

Note: If the HSMC loopback adapter is mounted, the I2C_SCL will be directly routed back to I2C_SDA.

Because audio chip, TV decoder chip and HSMC share one I2C bus, therefore audio and video chip won’t

function correctly.

Figure 6-8 illustrates the setup for this demonstration.

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Altera DE2-115 User Manual Page 88