Deep Dive w/Scott: Flash and Clocks oh my! #rp2040 #adafruit
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Deep Dive happens every week. Normally Fridays at 2pm Pacific but occasionally shifted to Thursday at 2pm. Typically goes for two hours or more. Questions are welcome. Next week is on Friday. If you are outside the US, double check the time because the US is changing this weekend. Time change in USA
0:00 Getting things going
03:09 hello
06:56 housekeeping
11:25 How do you keep the cats away from the workstation and hot irons?
12:40 how far is circuitpython's implementation of asynchronous I/O scheduler (uasyncio)?
14:44 Is there a time you'd pick the STM32F405 Feather over the SAMD51 feather? They seem similarly capable, but Adafruit seems all-in on the SAMD51
16:10 there was no feather airlift so ordered 1 on digikey which has not even shipped yet Ordered another airlift yesterday from adafruit when it came back in stock so which one will show up first?
18:05 Feather RP2040 flash speed fix
18:34 OSHPark USBmicromod/v1
19:29 Are you using debug-edge in anything? Know anyone else who is using it?
24:58 SMT assembly at OSH Park ( no )
25:11 how does OSH's flex pcb compare to the flex PCB on the neopixel/dotstar strips
26:41 Overhead / RP2040 feathers… flash socket
34:30 How big flash chip we can use with Metro/Feather M4 express? I tried mounting 64Mb but circuitpython didn't support it!!!
35:37 nvm.TOML improvements
38:43 Salea Logic Pro 16 work
40:52 Is there a good small library for ingesting uart stuff, and parsing into variables, in CP ? (for multi headed use cases)
41:19 back to the logic analyzer…. Examining the clock speed up during the boot process
51:10 Luke mentions RXDLY see boot2_w25q80.S for reference
55:46 Well it delays your sampling to the point in time where you launch the next clock transition
which should still give you plenty of hold time
because your data hold will be equal to round trip delay
so RX_SAMPLE_DLY = 1 should be fine for BAUDR = 2
ha, I bet the second read is the hardfault vector fetch
58:35 - works one time when new software is installed, but not on power up
1:00:30 is there a good source to understand how PIO was implemented? Its not part of the M0 "platform", right? So I'm assuming it’s something uniquely developed for the RP2040
1:01:30 updating firmware again….
1:06:09 Lady Ada drops in1
1:07:14 ItsyBitsy RP2040 prototype ( launching with 4MB flash? )
Discussion of Flash speed
1:17:30 - Luke added “there is more timing to play with -- for boot2_w25q80 we also disable input schmitt to get good setup timing. Have run the winbond devices at their max 133 MHz SCK reliably” (with RP2040 running a bit off-label :-) )
1:21:11 ‘quad enable bit non-volatile’ frustration / warning….
1:38:40 - catch desk of ladyada on Sunday!
1:39:15 bye LadyAda
1:39:30 Does this relate to the QT-Py flash?
1:40:02 so is there a volatile QSPI enable also?
1:41:25 Can Micro Python libraries work on Circuit Python?
1:42:06 Schmidt Trigger idea from Luke …
1:44:02 how do you get those cool colors and such in your terminal prompt??
1:44:20 Scott’s quick build machine -j32
1:48:45 commit code before moving back to C…
1:52:40 Did you get the Pomona clip working from last week?
1:53:30 What are you not allowed to tell us ?
1:55:15 is that 2 x 5 SWD header difficult to solder on?
1:56:55 how many times is a decent test for reliability in this sort of case?
1:59:25 rebase code
2:00:30 responding to spam calls ..
2:01:00 pull request
2:02:30 why are you using Mac? and why not Linux?
2:03:29 so what do you use to capture the camera feeds?
2:05:14 wrap up
2:06:28 sign off 4:07pm...
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