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= Raspberry Pi HATs =
 
= Raspberry Pi HATs =
 
This page will be used to document using various HATs on the Raspberry Pi. Please feel free to add notes pertaining to other HATs or additions to the existing entries.  
 
This page will be used to document using various HATs on the Raspberry Pi. Please feel free to add notes pertaining to other HATs or additions to the existing entries.  
 
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== For all HATs ==
== Sense Hat ==
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Remove the symlink for the dtb:
 
 
 
 
Remove the symlink for the dtb: (note that the link will be recreated on kernel upgrades, so dtoverlay settings will not work until the dtb link is removed)
 
 
  rm /boot/dtb
 
  rm /boot/dtb
 
Prevent the symlink from being recreated on kernel upgrade.  
 
Prevent the symlink from being recreated on kernel upgrade.  
 
  echo "FirmwareDT=True" >> /etc/u-boot.conf
 
  echo "FirmwareDT=True" >> /etc/u-boot.conf
  
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You now need to add the overlay for the HAT to the '/boot/efi/config.txt'. Below are some examples.
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== Sense Hat ==
 
Edit the '/boot/efi/config.txt' to add the overlay
 
Edit the '/boot/efi/config.txt' to add the overlay
 
  dtoverlay=rpi-sense
 
  dtoverlay=rpi-sense
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To use the screen you will need to install 'bcm283x-firmware-20191118-1.68ec481.fc31' or later. To use the touch features of the screen you also need to install 'kernel-5.4.0-0.rc8.git0.1.fc32' or later.
 
To use the screen you will need to install 'bcm283x-firmware-20191118-1.68ec481.fc31' or later. To use the touch features of the screen you also need to install 'kernel-5.4.0-0.rc8.git0.1.fc32' or later.
  
Remove the symlink for the dtb
 
rm /boot/dtb
 
Prevent the symlink from being recreated on kernel upgrade.
 
echo "FirmwareDT=True" >> /etc/u-boot.conf
 
 
Edit the '/boot/efi/config.txt' to add the overlay
 
Edit the '/boot/efi/config.txt' to add the overlay
 
  dtparam=i2c_arm=on
 
  dtparam=i2c_arm=on

Revision as of 20:00, 5 August 2020

Raspberry Pi HATs

This page will be used to document using various HATs on the Raspberry Pi. Please feel free to add notes pertaining to other HATs or additions to the existing entries.

For all HATs

Remove the symlink for the dtb:

rm /boot/dtb

Prevent the symlink from being recreated on kernel upgrade.

echo "FirmwareDT=True" >> /etc/u-boot.conf

You now need to add the overlay for the HAT to the '/boot/efi/config.txt'. Below are some examples.

Sense Hat

Edit the '/boot/efi/config.txt' to add the overlay

dtoverlay=rpi-sense

Working

  • Humidity Sensor (hts221)
  • Barometer (lps25h)
  • Magnetometer (lsm9ds1_magn)
  • Temperature (hts221, lps25h)

Not Working

  • 8x8 LED matrix display
  • Small 5 button joystick

Adafruit PiTFT Plus (3.5 inch Resistive Touch screen)

To use the screen you will need to install 'bcm283x-firmware-20191118-1.68ec481.fc31' or later. To use the touch features of the screen you also need to install 'kernel-5.4.0-0.rc8.git0.1.fc32' or later.

Edit the '/boot/efi/config.txt' to add the overlay

dtparam=i2c_arm=on
dtoverlay=pitft35-resistive
hdmi_force_hotplug=1

Add to the kernel parameters

fbcon=map:10 fbcon=font:ProFont6x11

Due to a bug the kernel module will not load automatically. On boot the module can be loaded with:

modprobe hx8357d

Due to a bug with the VC4 driver you will also need to blacklist it:

echo "blacklist vc4" >> /etc/modprobe.d/blacklist-vc4.conf

To workaround the bug and have it load automatically use:

echo hx8357d >> /etc/modules-load.d/hx8357d.conf