Join Scott as he continues to test CircuitPython on the Raspberry Pi. No Deep Dive next week.

Links:

https://adafruit.com

https://adafru.it/discord

https://github.com/adafruit/deep-dive-notes

https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface

https://www.raspberrypi.com/documentation/computers/processors.html

https://forums.raspberrypi.com/viewtopic.php?t=72260

0:00 Getting started

0:03:27 Housekeeping

0:07:02 not talking about esp-s3 today :-)

0:07:28 working on CP reliability

0:08:31 BCM2711 datasheet - “precautions for correct memory ordering” read and write barriers

0:11:20 Does anyone know if the feather interface handles I2S?I'm thinking about making an Audio Codec feather board.

0:11:50 Does anyone know if the feather interface handles I2S?I'm thinking about making an Audio Codec feather board.

0:13:10 When you hit a problem on this project, do you ever jump over to the Pi OS source code - to see how they implement what it is you are struggling with - to get clues on how to proceed?

0:14:30 facebook tftp server ( fbtftp python implementation of tftp server)?

0:17:26 twitch off/on to reset

0:20:00 examine the build system (CI / continuous integration) on github

0:21:00 submodule dependency optimizations

0:23:45 live watching on youtube has some lag due to closed captions

0:24:25 would i need a debug hat hat or soldered-up SWD to help test? haven't done that on a RPi Zero 2 yet

0:25:58 Mailbox code

0:29:41 consider switching to Pie Zero 2

0:35:04 pi imager complete / sync

0:36:32 debug pi zero 2 boot

0:37:40 DWC2 is null - probably the issue

0:38:40 Did you try USB boot on any of your board? You can boot a PiZero just plugged on the USB with proper software on the other side. ( no )

0:48:07 using svd to read VCMAILBOX STATUS1

0:58:21 you are using just one core of the RPi. Is there a plan to use more than just one core in the future?

0:59:45 boot to repl - not recovering from the flush

1:10:23 try a non-debug build

1:04:23 dump-stack - to find code lines for stack based addresses

1:05:29 USB handler looks like it is corrupting the stack

1:13:16 not-implemented error opcode

1:15:38 booted in widescreen - why?

1:16:20 still getting NotImplementedError: Opcode

1:17:00 So what fixed the USB? ( we don’t know it’s fixed yet - usb uart )

1:18:30 this time it successfully restarted

1:19:01 plug in the USB

1:20:15 try restarting again

1:20:53 when printing temperature - we get the notimplemented opcode error

1:27:00 try again - USB pops up -

1:27:30 Is what’s on git supposed to be working right now? (yes)

1:28:50 port_get_raw_ticks #asm(“dsb sy”) memory barrier

1:34:00 discord #live_broadcast_chat for kernel8.img and firmware.disk.img.zip

1:35:50 “add --depth 1 or you'll be downloading 20 GB of submodule”

1:37:30 something about unplugging the USB

1:38:45 perhaps USB interrupt isn’t clearing something

1:46:04 Are the docs for this Broadcom stuff publicly available? And if so where would one find them?

1:48:01 this build does not work:

1:48:50 other documentation resources

1:49:15 can’t connect to jlink jtag debug till I disconnect USB

1:45:53 are the swd debug pins on the header? or configurable to the header? or is it time to heat up some testpoint pads?

1:51:48 turn on rando in ports in mpconfigport.mk CIRCUITPY_RANDOM = 1

1:53:44 import random works random.randint(0,9)

1:54:40 check “Ci” / it’s working

1:56:20 tinyusb doesn’t work :-(

1:57:45 these builds don’t work on zero 2 yet

1:58:10 report bug in tinyusb / Broadcom USB address / Pi Zero 2W github.com/hathach/tinyusb/issues

2:02:10 checking git status before commit

2:04:00 explaining the origin_build push

2:07:00 CP now has Russian support

2:07:45 pushes complete / ci will run again, zero 2W builds won’t work

2:08:12 wrap up

2:10:40 cat cam

2:11:10 end of feed

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