Luckfox Lyra on PicoCalc

PicoCalc
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102

Finally i have doom on my Pico calc thank you all.Even if theres no sound willing to learn and hack :slight_smile:

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103

I do check the schematic. It seems that adc_ref doesnā€™t connect to anything. Itā€™s not used on PicoCalc.

When outputting audio via soft pwm, the low pwm frequency causes the noise to be heard by human ears. If I can make the frequency above 20khz, the problem would be solved.

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I see. Thanks for your reply.

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I presume the Lyra pico board is the most powerfull on the market in this form factor?

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Maybe this is helpful?
It is used in the MP3Player example.

What i donā€™t get is if the pins 32 and 31 also works as DAC why we need to PWM them in software? I am not a specialist so please forgive my stupid question.

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It seems so at this point but dont forget the Pico and Pico2, Pimoroni etc can be overclocked a moderate amount and close the gap a little. Some appear to be limited by psram speed (whether on the Core board or PicoCalc)ā€¦

108

Lyra also has a memory management unit which lets it host a true modern OS. The others, no matter the speed bump, are microcontrollers.

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109

I would love to see some real life test with all the boards.

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Iā€™m planning to make this modification on the lyra instead of on the PicoCalc - I donā€™t see why I couldnā€™t run the wire on that end instead, though it might be a little more of a pain to plug / unplug.

I will just take a piece of solid core wire and place it where the removed pin was (possibly with a dab of hot glue or something to hold it in place), route across the top of the board, and solder it onto pin 4 on the other side. Pretty sure that should work just as well without modifying the PicoCalc.

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Well any easy sound and wifi option is a god send.

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Like this ? :rofl:. Soldered wirewrap (had to be very low profile)ā€¦

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MAYBE a little TOO much like that :rofl:

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what Iā€™m wondering is that https://www.waveshare.com/luckfox-lyra.htm indicates the RK3506G2 has matrix IO, which SHOULD mean the PWM should be easily remapped to the right pin without having to modify the hardware. Iā€™m still looking for documentation on USING that, though.

Ah - thereā€™s my answer. It does indeed suck that those pins specifically are not RMIO capable. oh well. Hacking at the hardware with a soldering iron is simpler anyway.

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115

Do you have a link to that adapter.

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My conclusion for today:
Wlan USB has worked but USB may not show up if you had a low battery (only one).
The audio mod is working,(Honestly the batch cable is easy do remove) You must execute:

insmod /usr/lib/picocalc_snd_pwm.ko

I think it is not good for the SD-CARD to simply switch the Picocalc off. I recommend to execute

poweroff

When the red light stops blinking you good to turn the device off. (Screen will not switch off and freeze)

BTW. Thanks to @hisptoot :heart:

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There are tons on Aliexpress.
https://www.aliexpress.us/item/3256806419086361.html

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Thanks let uk know if wifi will work with this cable.

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From what was said earlier in the thread, it wonā€™t work with a wifi adapter directly because the power supplied wonā€™t be enough. Itā€™s all discussed father up the thread. I decided not to try and risk damaging the Lyra.

I might consider getting one of these to convert the power inline, but I havenā€™t bought one yet.

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May I ask why you want a 5v to 3.3v converter for usb?

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I was thinking about it the other way around. If there was a way to convert the 3.3v to 5v then it could power a network dongle or some other USB device through this connector. But thatā€™s why I asked because I donā€™t really understand the hardware aspects well enough to ensure I wouldnā€™t damage anything.