Deep Dive w/Scott: Pin Muxing

Join Scott as he discusses dynamic pin muxing in the Zephyr port. For example, pin muxing allows user code to use any I2C on any capable pins. He'll also answer any questions folks have. Visit the Adafruit shop online - http://www.adafruit.com Thanks to dcd for timecodes 0:00 Getting started 0:37 join the discord #live-broadcast-chat channel on http://adafru.it/discord 1:00 Scott welcomes you to the deep dive, working for open source hardware company http://www.adafruit.com/ 1:38 Circuit Python (CP) runs on microcontrollers 2:52 "Snake Acceleration", (using micropyton v1.28 native modules to speed things up) in CP v10.4 5:10 The new bootloader hopefully will go into CP v10.4 also 6:00 Github adafruit/circuitpython insights 6:30 Picogame and CI speedup 7:45 CP is a fork of micropython 8:54 Zephyr Pin Muxing / github zephyr "Introduce Dynamic pinctrl" #18255 9:19 Zephyr device tree file zephyrproject-rtos / zephyr / boards / adafruit / feather_nrf52840 dtsi example 12:20 CP allows specifying pins at run time ( https://learn.adafruit.com/circuitpython-essentials/circuitpython-i2c ) 13:30 Goal is to get zephyr port to allow dynamic pin control 14:20 nRF54LM20 datasheet 16:34 iMX RT1011 adafruit.com/product/4950 pin names, mapped to 17:07 main guide ( learn.adafruit.com/adafruit-metro-m7-with-airlift ) 17:27 Follow D10 to cpu on fab print https://learn.adafruit.com/assets/119301 17:50 schematic trace D10 net name to GPIO_06 on iMX RT1010 https://learn.adafruit.com/assets/119300 19:20 pins.c in board folder 20:39 i.MX RT1010 datasheet block diagram / IOMUX / pin muxing background 26:28 down in the weeds with the i.MX RT1010 processor reference manual 28:55 Chapter 10-12 IOMUX Controller (Port / Pin / Pad ) 30:00 Intel 8080 die shot - example ioring / pad 30:50 RT1011 IORING pad and IOMUX 32:39 IOMUXC functional description / peripheral to pad muxing 35:19 GPIOMUX diagram and scheme 36:40 GPIO pad structure 38:30 settings to connect function to chips pin, and board pin 39:30 github adafruit circuitpython / ports / mimxrt10xx / common-hal / busio / I2C.c 40:50 common_hal_busio_i2c_construct() parameters 41:00 #if CIRCUITPY_REQUIRE_I2C_PULLUPS and "No pull up found" exception 42:11 searching the mcu_i2c sda and scl lists 43:30 refer to datasheet 43:23 and lists in periph.c 45:17 goals for zephyr 46:36 compare to nRF54LM20A data sheet 53:17 peripher and subsystem assignment 8.9.4 ( Nordic PSEL ) 54:30 dynamic_bus.h dynamic_bus_i2c_allocate(), spi, and uart API 57:54 dynamic_bus_gpio.c implementation 58:45 zephyr dts structures 59:41 stm32c0 arm m0 small package wrinkle 1:02:43 alternate function mapping 1:03:47 wrap up pin muxing background 1:04:00 discord ( see above ) live all week, also, deep divers role 1:05:21 see you next week ----------------------------------------- LIVE CHAT IS HERE! http://adafru.it/discord Subscribe to Adafruit on YouTube: http://adafru.it/subscribe New tutorials on the Adafruit Learning System: http://learn.adafruit.com/ -----------------------------------------