Altera DE2-115 User Manual page 106

 Demonstration Setup, File Locations, and Instructions
 Hardware Project directory: DE2_115_AUDIO
 Bit stream used: DE2_115_AUDIO.sof
 Software Project directory: DE2_115_AUDIO\software\
 Connect an Audio Source to the LINE-IN port of the DE2-115 board.
 Connect a Microphone to MIC-IN port on the DE2-115 board.
 Connect a speaker or headset to LINE-OUT port on the DE2-115 board.
 Load the bit stream into FPGA. (note *1)
 Load the Software Execution File into FPGA. (note *1)
 Configure audio with the Slide switches.
 Press KEY3 on the DE2-115 board to start/stop audio recoding (note *2)
 Press KEY2 on the DE2-115 board to start/stop audio playing (note *3)
Note:
(1). Execute DE2_115_AUDIO\demo_batch\audio.bat will download .sof and .elf files.
(2). Recording process will stop if audio buffer is full.
(3). Playing process will stop if audio data is played completely.
(4).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.
Table 6-7 Slide switches usage for audio source and signal processing setting
Slide Switches
SW0
SW1
SW2
Table 6-8 Slide switch setting for sample rate switching for audio recorder and player
SW5 SW4
(0 – DOWN; (0 – DOWN;
1- UP) 1-UP)
0 0
0 0
0 1
0 1
1 0
Unlisted combination
0 – DOWN Position
Audio is from MIC
Disable MIC Boost
Disable Zero-cross Detection
SW3
(0 – DOWN;
1-UP)
0
1
0
1
0
1 – UP Position
Audio is from LINE-IN
Enable MIC Boost
Enable Zero-cross Detection
Sample Rate
96K
48K
44.1K
32K
8K
96K
105