noggin
Posts: 98
Joined: Sun Feb 21, 2016 1:55 pm

Pi4 - more SPI - more TV Hats?

Fri Jul 12, 2019 1:54 pm

Theoretically - would it be possible to fit more than one TV Hat to a Pi 4B (as it has more SPI buses) with a suitable adaptor - to allow for dual tuner working?

jdb
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 2123
Joined: Thu Jul 11, 2013 2:37 pm

Re: Pi4 - more SPI - more TV Hats?

Fri Jul 12, 2019 5:39 pm

I'm going to go with "yes" but the HATs won't be directly stackable. The SPI pins used by the HAT need to be redirected to another SPI peripheral. Also, data reads from the HAT EEPROMs will collide so the ID pins need to be disconnected and the devicetree entries manually provided/edited.
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noggin
Posts: 98
Joined: Sun Feb 21, 2016 1:55 pm

Re: Pi4 - more SPI - more TV Hats?

Sat Jul 13, 2019 4:55 pm

Thanks - presumably the drivers would need to be updated too and some manual configuration somehow to point to the right SPI buses in the absence of a HAT EEPROM for the 'second' TV Hat?

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