paulh002 / rpi-audio-hat

Raspberry Pi PCM1808 and 5102 audio hat for SDR tranceiver

rpi-audio-hat

Raspberry Pi PCM1808 and 5102 audio hat for SDR tranceiver. This board can be used with the Tayloe mixers in this repo https://github.com/paulh002/SoapyHifiBerry as alternative for the HifiBerry The SoapyHifiBerry driver is used to supply IQ signals to the SDR software see sdrberry SDR software (https://github.com/paulh002/sdrberry) Configure the SoapyHifiBerry config file with the correct audio board name and sample frequencey

To test the board:

• To check if board is loaded:

aplay -l 
arecord -l

• Reord and play:

arecord -D hw:0,1 -c 2 -f S24_LE -r 96000 test.wav
aplay -c2 -f S24_LE -r 96000 test.wav

Hardware

Kicad files and gerbers are availeble in hardware directory. R10 and R11 are used to switch between clock from the Pi or internal PLL of the pcm5102 (gnd is internal pll) J5 exposes I2S for setting the mixer frequency of the si5351 on the Tayloe mixer board.

Prototype

Picture shows prototype using cheep aliexpress adc and dac boards To connect the boards you can use this table:

pcm 5102

Board	GPIO	Pin
SCK	4	12
LCK	19	35
BCK	18	12
DIN	21	40
5V	5V	2
FMT	GND	19
FLT	GND	19
XSMT	3v	1

pcm 1808

Board	GPIO	Pin
SCK	4	12
LCK	19	35
BCK	18	12
Dout	20	38
MD0	3V	1
MD1	3V	1
5V	5V	2
3V	3V	1
SCLK	4	7

Kicad files

Kicad design is a pcb version of the audio board

How compile and install driver for pcm1808 and pcm5102

To support the audio card in slave mode an overlay need to be created. The raspberry pi supports already most audio cards with pcm1808 and pcm5102. The procedure and files are taken from Akiyuki Okayasu github page https://github.com/AkiyukiOkayasu/RaspberryPi_I2S_Slave

Compile on Raspberry Pi

dtc -@ -H epapr -O dtb -o genericstereoaudiocodec.dtbo -Wno-unit_address_vs_reg genericstereoaudiocodec.dts

Copy genericstereoaudiocodec.dtbo to /boot/overlays

sudo cp genericstereoaudiocodec.dtbo /boot/overlays

Edit /boot/config.txt
Enable I2S and add genericstereoaudiocodec device tree overlay

#dtparam=i2c_arm=on
dtparam=i2s=on
#dtparam=spi=on
dtoverlay=genericstereoaudiocodec

If you don't need HDMI audio output and Raspberry Pi's headphone output, comment out "dtparam=audio=on" by hash.
like this.

#dtparam=audio=on