P0071 Terasic Technologies Inc, P0071 Datasheet - Page 92
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P0071
Manufacturer Part Number
P0071
Description
TPAD MULTIMEDIADEVELOPMENT KIT
Manufacturer
Terasic Technologies Inc
Series
tPAD, Cyclone®IVr
Specifications of P0071
Main Purpose
Reference Design, Tablet
Embedded
Yes, FPGA / CPLD
Utilized Ic / Part
EP4CE115
Primary Attributes
8-Inch TFT LCD, LED Backlight
Secondary Attributes
5-Megapixel Digital Image Sensor
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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The audio chip should be configured before sending audio signal to the audio chip. The main
program uses I2C protocol to configure the audio chip working in master mode; the audio output
interface working in I2S 16-bits per channel and with sampling rate according to the wave file
contents. In audio playing loop, the main program reads 512-byte audio data from the SD Card, and
then writes the data to DAC FIFO in the Audio Controller. Before writing the data to the FIFO, the
program will verify if the FIFO is full. The design also mixes the audio signal from the
microphone-in and line-in for the Karaoke-style effects by enabling the BYPASS and SITETONE
functions in the audio chip.
Finally, users can obtain the status of the SD music player from the 16x2 LCD module, the
7-segment display, and the LEDs. The top and bottom row of the LCD module will display the file
name of the music that is played on the DE2-115 board and the value of music volume, respectively.
The 7-segment displays will show the elapsed time of the playing music file. The LED will indicate
the audio signal strength.
Demonstration Setup, File Locations, and Instructions
Project directory: DE2_115_SD_Card_Audio_Player
Bit stream used: DE2_115_SD_Card_Audio_Player.sof
Nios II Workspace: DE2_115_SD_Card_Audio_Player\Software
Format your SD Card into FAT16/FAT32 format
Place the wave files to the root directory of the SD Card. The provided wave files must have a
Load the bitstream into the FPGA on the DE2-115 board(note*1)
Run the Nios II Software under the workspace
sample rate of either 96K, 48K, 44.1K, 32K, or 8K. In addition, the wave files must be stereo
and 16 bits per channel.
DE2_115_SD_Card_Audio_Player\Software(note*1)
Figure 6-14 Software Stack of the SD music player demonstration
System
Call
SEG7
I2C Audio
Nios HAL
Main
Receiver
91
IR
SD 4-bit Mode
FAT16/FAT32
WAVE Lib
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