TODO.md

TODO

• Change rx labels in PIO (cf. #6)

• (?) Make -Wimplicit-function-declaration an error

• PicoW+TCP/IP - [ ] Figure out SD card detect interrupt conflict - (?) Use GPIO poll - georgerobotics/cyw43-driver#33 - raspberrypi/pico-sdk#1068 - https://forums.raspberrypi.com/viewtopic.php?t=348664 - sekigon-gonnoc/Pico-PIO-USB#76

  • Buzzer

  • (?) CLI auth - HOTP

  • (?) Replace CLI with API

  • tweetnacl/TLS - [ ] TCP/IP - (?) ACL - (?) Auth

  • (?) DTMF

Schematic

• RD/WR jumpers
• Mode jumpers
• Buzzer
  • through-hole so that it can be routed to enclosue
• LEDs
  • through-hole so that they can be routed to enclosue
• Reset button
• SD card
• (?) Long line drivers
• (?) PiZero header

Other

1. NuttX
2. RiotOS

NOTES

1. Delta time for card read is 53ms (~2ms/bit)

2. PIO clock

   • 125MHz -> 8ns per instruction
   • nop [32] -> 256ns => 0.256us
   • 32x loop -> 8192ns => 8.192us
   • div 64 => 0.5ms
   • configured at 152.588 (~1.25s)
   • maximum div for reliable reads is 192 (~1.6ms)

3. https://github.com/teslamotors/liblithium

4. https://www.mouser.ca/ProductDetail/Microchip-Technology-Atmel/ATECC608A-MAHDA-T?qs=wd5RIQLrsJiNcP5AuKx6KQ%3D%3D

   • https://www.sparkfun.com/products/18077
   • https://www.mikroe.com/secure-4-click

5. Lua

   • https://github.com/kevinboone/luapico
   • https://sillycross.github.io/2022/11/22/2022-11-22/

6. TPIC6B595

   • https://www.ti.com/lit/an/slpa004a/slpa004a.pdf
   • https://docs.arduino.cc/tutorials/communication/guide-to-shift-out
   • https://www.appelsiini.net/2012/driving-595-shift-registers/#spcr
   • https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1133532/tpic6595-relay-back-emf

7. Level shifters

   • https://www.tindie.com/products/ddebeer/12v-level-shifter-and-buffer-2x6-channel
   • https://electronics.stackexchange.com/questions/486571/12v-to-3-3-v-logic-level-shifter

8. Relay drivers

   • https://electronics.stackexchange.com/questions/585207/uln2003-relay-driver
   • https://electronics.stackexchange.com/questions/258081/uln2003-used-for-security-door-magnets
   • https://electronics.stackexchange.com/questions/357351/shift-register-that-accepts-3-3v-to-drive-several-5v-relays
   • https://electronics.stackexchange.com/questions/505318/how-to-properly-use-a-relay-module-with-jd-vcc-from-arduino-raspberry/508672#508672
   • https://raspberrypi.stackexchange.com/questions/118604/using-single-5v-relay-module-jqc-3ff-s-z-asking-for-help

9. USB

   • https://forums.raspberrypi.com/viewtopic.php?t=331207
   • raspberrypi/pico-examples#19
   • https://forums.raspberrypi.com/viewtopic.php?t=333027
   • https://blog.smittytone.net/2021/10/31/how-to-send-data-to-a-raspberry-pi-pico-via-usb
   • https://blog.smittytone.net/2022/02/16/pico-usb-serial-communications-with-circuitpython
   • https://forum.micropython.org/viewtopic.php?t=11305

10. PicoW

• micropython/micropython#9003
• https://stackoverflow.com/questions/74883568/oserror-errno-12-enomem-with-pi-pico-w
• sekigon-gonnoc/Pico-PIO-USB#78
• sekigon-gonnoc/Pico-PIO-USB#76
• https://www.nongnu.org/lwip/2_1_x/index.html
• https://www.scaprile.com/2023/02/05/on-hardware-state-machines-how-to-write-a-simple-mac-controller-using-the-rp2040-pios
• https://ww1.microchip.com/downloads/en/Appnotes/Atmel-42233-Using-the-lwIP-Network-Stack_AP-Note_AT04055.pdf
• https://forums.raspberrypi.com/viewtopic.php?t=337666
• https://forums.raspberrypi.com/viewtopic.php?t=349890

11. PicoW + SYSLED

• https://smist08.wordpress.com/2022/08/26/introducing-the-raspberry-pi-pico-w/
• https://forums.raspberrypi.com/viewtopic.php?t=348664
• https://datasheets.raspberrypi.com/picow/connecting-to-the-internet-with-pico-w.pdf
• https://www.raspberrypi.com/documentation/pico-sdk/networking.html#pico_cyw43_driver