88 lines
2.6 KiB
Markdown
88 lines
2.6 KiB
Markdown
# NixOS on Pinecube (Early work in progress)
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Build an SD card image with `./build.sh`.
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Prebuilt image [here](https://drive.google.com/file/d/11mBzfGHeLLP26nse0ntxUWxuBqUYKiIK/view?usp=sharing). (updated 2020-10-18)
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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/<sdcard> bs=1024
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```
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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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# 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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```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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## 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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(Except they seem to be reversed. Setting 0 brightness turns them on, setting 1 turns them off)
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Change it to `ACTIVE_HIGH` in dtb?
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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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dmesg error: `spi-nor spi0.0: unrecognized JEDEC id bytes: 0b 40 18 0b 40 18`
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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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## USB
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Not working in linux or u-boot
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dmesg reports: `supply vcc not found, using dummy regulator`
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## WIFI
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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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Is not in currently in DTB at all.
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Maybe use sun7i-a20 as example. It has a "codec" block.
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See the S3 manual, grep for I2S/PCM.
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