135 lines
5.0 KiB
Markdown
135 lines
5.0 KiB
Markdown
# NixOS on Pinecube
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Download / install Nix using the instructions [here](https://nixos.org/download.html).
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Then, build an SD card image with `./build.sh`.
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Otherwise, a prebuilt image is available [here](https://drive.google.com/file/d/1iXVv9R-33DoFKE-WSPZ4XoemhYPZPcU2/view?usp=sharing) (last updated 2020-11-21).
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Decompress and flash with:
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```shell
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$ cat ./result/sd-image/nixos-sd-image-21.03pre-git-armv7l-linux.img.zst | zstd -d | dd of=/dev/sdX bs=1024
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```
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It should be accessible over UART2 pins (see pinout on wiki) or SSH.
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- Username: `nixos`
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- Password: `nixos`
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This repository remains a work-in-progress, with certain features I need still not finished, including hardware accelerated encoding support.
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# Additional Notes
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## Recording from CSI camera:
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- https://linux-sunxi.org/CSI#CSI_on_mainline_Linux_with_v4l2
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- https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/subdev-formats.html
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Streaming via rtmp:
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Run a RTMP server on a machine on the network (assuming at 192.168.1.200).
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On pinecube
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```shell
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$ media-ctl --set-v4l2 '"ov5640 1-003c":0[fmt:UYVY8_2X8/640x480@1/15]'
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$ ffmpeg -s 640x480 -r 15 -i /dev/video0 -vcodec flv -f flv rtmp://192.168.1.200/live/pinecube
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```
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On receiving machine:
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```shell
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$ mpv "rtmp://192.168.1.200/live/pinecube" --profile=low-latency --cache-secs=1
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```
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To enable audio in the stream: (see section below for further audio details)
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```shell
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$ media-ctl --set-v4l2 '"ov5640 1-003c":0[fmt:UYVY8_2X8/320x240@1/15]'
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$ ffmpeg -s 320x240 -r 15 -i /dev/video0 -f alsa -ac 1 -ar 22050 -i hw:0,0 -acodec libmp3lame -vcodec flv -f flv rtmp://192.168.1.200/live/pinecube
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```
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(Ensure that Mic1 is active and unmuted using `alsamixer`)
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CPU usage while encoding required me to also lower camera resolution and also the audio sampling rate.
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Let me know if you find ffmpeg settings that give a good balance between quality, CPU usage, and bitrate.
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## Activating IR LEDs:
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```shell
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$ echo 1 > /sys/class/leds/pine64\:ir\:led1/brightness
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$ echo 1 > /sys/class/leds/pine64\:ir\:led2/brightness
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```
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## GPIO:
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https://linux-sunxi.org/GPIO
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```shell
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$ cat /sys/kernel/debug/pinctrl/1c20800.pinctrl/pinmux-pins
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```
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gives information about pin numbering and what pins already claimed for other things
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### Enabling/disabling IR-cut filter
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```shell
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# Export gpio, set direction
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$ echo 45 > /sys/class/gpio/export
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$ echo out > /sys/class/gpio/gpio45/direction
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# 1 to enable, 0 to disable
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$ echo 1 > /sys/class/gpio/gpio45/value
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```
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### Passive IR detection
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```shell
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# Export gpio, set direction
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$ echo 199 > /sys/class/gpio/export
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$ echo in > /sys/class/gpio/gpio199/direction
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# Returns 1 for presence, 0 for none
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$ cat /sys/class/gpio/gpio199/value
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```
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## SPI NOR
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The published schematic says it's a `GD5F4GQ4UCYIG`, however the label on the pinecube I have is for an `XT25F128B`.
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And this matches the JEDEC bytes reported in Linux.
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```shell
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$ sudo modprobe spi-nor
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```
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The device is accessible at `/dev/mtd0`.
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### SPI Boot
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Run `nix-build -A firmware-installer`. Then,
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```shell
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$ dd if=result/firmware-installer-image.img of=/dev/sdX bs=1024
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```
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Then, use the menu option available over UART2 to install u-boot to the SPI.
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I initially flashed a bad u-boot, which caused me to be unable to boot from MMC or even FEL.
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I was able to force the Pinecube to load into FEL by grounding the `SPI0_MISO` pin.
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Then, I could boot into u-boot and erase the SPI, returning the Pinecube to factory condition.
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## Ethernet
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Working fine in linux, and now also u-boot with patch derived from: https://lists.denx.de/pipermail/u-boot/2020-May/413924.html
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S3 datasheet says it supports up to 1000Mbit, but we only have a 100Mbit PHY: `H1601CG`
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Maybe this is for easier PoE support?
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## USB
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Working in linux, currently not in u-boot.
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## WIFI
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Other individuals have reported WiFi is working for them with exactly the same NixOS configuration.
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However, it currently doesn't work for me.
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This may be a hardware / power issue on my device.
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Sometimes, `iwlist wlan0 scan` works fine.
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However, it frequently stopps working after starting `wpa_supplicant`.
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Dmesg errors:
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```
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Oct 19 06:11:31 nixos wpa_supplicant[926]: Successfully initialized wpa_supplicant
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Oct 19 06:11:32 nixos kernel: sunxi-mmc 1c10000.mmc: data error, sending stop command
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Oct 19 06:11:32 nixos kernel: sunxi-mmc 1c10000.mmc: send stop command failed
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```
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## Audio
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S3 has significant differences when compared with V3s.
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It has 4 audio inputs (3 mics, 1 line in), and 2 audio outputs (headphone and line out).
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Currently, only the microphone is working. I tried to get audio output working but didn't have any luck.
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PineCube MainBoard schematic says that the audio amplifier is connected in pin PB5 (PWM1) but in reality it is connected to PG6 (UART1_TX).
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Use `alsamixer` to ensure mic is active and unmuted.
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```shell
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$ ffmpeg -f alsa -ar 22050 -i hw:0,0 -acodec mp3 -f flv rtmp://192.168.1.200/live/pinecube
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```
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## Power Supply
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See `/sys/class/power_supply/axp20x-ac`.
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See `/sys/class/power_supply/axp20x-battery/{status,capacity}`.
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Green LED if power is on.
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Red LED if battery is charging.
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