12-09-2020, 09:15 AM
(12-09-2020, 02:18 AM)Antelopepoop Wrote: Gecko, I'm looking forward to rigging up your latest CarPiHat revision into my system.
I'm planning a "no-compromises" build in my new (to me) '06 Tundra. I'll post it in the builds section once I can get everything working.
Will the latest revision come with a stacking connector? I am planning on adding a DAC and maybe a DSP to this hat sandwich.
Specifically, I am looking at the HiFiBerry DAC2 HD and the DSP add-on board. I couldn't tell from your pictures what this revision would ship with.
With regards to shared GPIO pins, the HiFiBerry folks say that "GPIO2-3 (pins 3 and 5) are used by our products for configuration of the DAC and the clock circuit." They advise that "If you are experienced with I2C, you might add other slave devices. If you a a novice, we don’t recommend this at all." This threw up a big warning sign for me :-)
Do you think the real time clock on the I2C bus of the CarPiHat will interfere with my planned DAC? Any advice on how I can make that work?
Hey!
Great, I look forward to seeing what you come up with
The latest version does not come with a stacking connector, as a board stacked on top of the HAT would interfere with the Molex connectors.
Whilst the HAT standard does not support HAT stacking, I see no reason why you should have any problems combining a CarPiHAT and a HiFiBerry DAC2 HD, although they don't mention what I2C address they use in their datasheet. Provided they do not require address 0x68 to be kept free, then the I2C side of things should be fine, and you shouldn't need any other configuration changes.
As for the DSP board, I don't think this will be compatible, as it has GPIO collisions with some of the pins used on the CarPiHAT.
That all being said, I haven't personally tested this combination, so I cant say for sure that they will play nice together!
I hope this helps,
Sam
That