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https://github.com/reinderien/pianotuner
Python-based piano spectral analysis
https://github.com/reinderien/pianotuner
Last synced: about 1 month ago
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Python-based piano spectral analysis
- Host: GitHub
- URL: https://github.com/reinderien/pianotuner
- Owner: reinderien
- Created: 2015-12-20T19:04:08.000Z (almost 9 years ago)
- Default Branch: main
- Last Pushed: 2024-08-10T17:54:38.000Z (3 months ago)
- Last Synced: 2024-08-10T18:50:28.617Z (3 months ago)
- Language: C
- Size: 4.8 MB
- Stars: 5
- Watchers: 3
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: readme.md
Awesome Lists containing this project
README
# Custom Piano Tuner
## Environment
### apt packages
- libasound2-dev (for compilation only)
- libasound2 - underlying ALSA support
- linux-libc-dev - Linux headers for SPI
Remove pulseaudio.
Todo: move to headless mode and blow away a pile of unneeded packages.
### /boot/config.txt
```
# See https://rpf.io/configtxt
dtparam=spi=on
dtoverlay=spi0-1cs
arm_64bit=1
# todo: turn off video
```
### Audio USB device details
`dmesg`:
```
usb 1-1.2: new full-speed USB device number 3 using xhci_hcd
usb 1-1.2: New USB device found, idVendor=0d8c, idProduct=013c, bcdDevice= 1.00
usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1.2: Product: USB PnP Sound Device
usb 1-1.2: Manufacturer: C-Media Electronics Inc.
input: C-Media Electronics Inc. USB PnP Sound Device as /devices/platform/scb/fd500000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0/usb1/1-1/1-1.2/1-1.2:1.2/0003:0D8C:013C.0001/input/input0
hid-generic 0003:0D8C:013C.0001: input,hidraw0: USB HID v1.00 Device [C-Media Electronics Inc. USB PnP Sound Device] on usb-0000:01:00.0-1.2/input2
```
`lsusb`:
```
Bus 001 Device 003: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller
```
`arecord -l`:
```
**** List of CAPTURE Hardware Devices ****
card 1: Device [USB PnP Sound Device], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
```
`arecord -L`:
```
default:CARD=Device
USB PnP Sound Device, USB Audio
Default Audio Device
sysdefault:CARD=Device
USB PnP Sound Device, USB Audio
Default Audio Device
hw:CARD=Device,DEV=0
USB PnP Sound Device, USB Audio
Direct hardware device without any conversions
plughw:CARD=Device,DEV=0
USB PnP Sound Device, USB Audio
Hardware device with all software conversions
```
Examine these lines in `/usr/share/alsa/alsa.conf`; the defaults should
correspond to the correct card and device listed above:
```
defaults.ctl.card 1
defaults.pcm.card 1
defaults.pcm.device 0
defaults.pcm.subdevice 0
```
### Audio input test
```
$ arecord -D hw:CARD=Device,DEV=0 -c 1 -f S16_LE -r 48000 -d 1 -v output-test
Recording WAVE 'output-test' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
Hardware PCM card 2 'USB PnP Sound Device' device 0 subdevice 0
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 24000
period_size : 6000
period_time : 125000
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 6000
period_event : 0
start_threshold : 1
stop_threshold : 24000
silence_threshold: 0
silence_size : 0
boundary : 1572864000
appl_ptr : 0
hw_ptr : 0
```
### Verifying SPI
```
$ raspi-gpio get | grep SPI0
GPIO 9: level=0 fsel=4 alt=0 func=SPI0_MISO pull=DOWN
GPIO 10: level=0 fsel=4 alt=0 func=SPI0_MOSI pull=DOWN
GPIO 11: level=0 fsel=4 alt=0 func=SPI0_SCLK pull=DOWN
```
```
$ lsmod | grep spi
spidev 24576 0
spi_bcm2835 24576 0
```
```
$ ls -l /dev/spi*
crw-rw---- 1 root spi 153, 0 Dec 5 17:06 /dev/spidev0.0
```
```
# First, guarantee sync; this requires at most two bytes
echo -ne "\x00\x00" > /dev/spidev0.0
# Channel 1: 1V, 205: 0b001_000_00 0b1100_1101
echo -ne "\x20\xCD" > /dev/spidev0.0
# Channel 2: 2V, 410: 0b010_000_01 0b1001_1010
echo -ne "\x41\x9A" > /dev/spidev0.0
# Channel 5: 3V, 614: 0b101_000_10 0b0110_0110
echo -ne "\xA2\x66" > /dev/spidev0.0
# Channel 4: 4V, 26, 0b100_11001
echo -ne "\x99" > /dev/spidev0.0
```