Deep Dive w/Scott: Raspberry Pi Testing #adafruit
28Join 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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