Neste Webinar do Embarcados, Matheus Castello vai introduzir e demonstrar o pin control subsystem do Kernel Linux. Desmistificar o uso dos device trees para configuração e multiplexação de GPIOs, e mostrar os detalhes dependentes de arquitetura. Página do Webinar no Embarcados: https://www.embarcados.com.br/webinars/webinar-linux-embarcado-desvendando-o-pin-control-subsystem-kernel-linux/

1. IMAGEM DESTAQUE DO
WEBINAR

3. WHO I AM ?
MATHEUS DE BARROS CASTELLO
29 year old, BS in Computer Science
Embedded SW Engineer
Linux Kernel Developer

4. WHO I AM ?
MAIN CONTRIBUTIONS
Linux Kernel
v4.18 - v5.6*
BCM2835 Pinctrl
Power Supply
dotnet/iot
.Net Core
Libgpiod / PWM

5. WHO I AM ?
CHANNELS

6. WHO I AM ?
YOUTUBE - https://www.youtube.com/microhobbybrasil

7. WHO I AM ?
SOCIAL NETWORKS
/microhobby
/in/matheuscastell
o
@microhobby
/microhobbybrasil

8. PINCTRL SUSBYSTEM
PIN CONFIGURATION
AND MULTIPLEXING
PIN CONTROL
SUBSYSTEM?
DEVICE TREE
BINDINGS?

9. PINCTRL SUSBYSTEM
HOW KERNEL KNOW PERIPHERALS THAT ARE CONNECTED?

10. PINCTRL SUSBYSTEM
AUTO ENUMERATION BUS

11. PINCTRL SUBSYSTEM
EMBEDDED SYSTEMS - PERIPHERAL DIRECT CONNECTED TO PINS

12. PINCTRL SUSBYSTEM
DEVICE TREES DESCRIBE HARDWARWE TO KERNEL

13. DEVICE TREE

14. PINCTRL SUSBYSTEM
PIN CONFIGURATION AND MULTIPLEXING

15. PINCTRL SUSBYSTEM
DEVICE TREES DESCRIBE HARDWARWE TO KERNEL

16. GPIO
GENERAL PURPOSE INPUT OUPUT - PINS
SETTING UP GPIO
BCM2835
GPIO
MUX OUT MUX IN
PULL
DOWN
PULL UP

17. GPIO
GENERAL PURPOSE INPUT OUPUT - PINS
PIN MULTIPLEXING

18. GPIO
GENERAL PURPOSE INPUT OUPUT - PINS
ATMEGA328P
PB6 / PIN13
MUX OUT MUX IN
PULL UP
PIN MULTIPLEXING

19. PIN MULTIPLEXING AND CONFIGURATION
GPIO
GENERAL PURPOSE INPUT OUPUT - PINS

20. ATMEGA328P
PB6 / PIN13
MUX OUT MUX IN
PULL UP
GPIO
GENERAL PURPOSE INPUT OUPUT - PINS

21. PINCTRL SUSBYSTEM
SETTING UP GPIO
PIN CONTROL SUBSYSTEM

22. PINCTRL DEVICE TREE BINDINGS
DEFINE PIN CONTROL PROPERTIES

23. PINCTRL SUBSYSTEM
PARSE DEVICE TREE PINCTRL BINDINGS
PARSE PINCTRL BINDINGS
WRITE PIN CONF REGISTERS
WRITE PIN MUX REGISTERS

24. DEMO TIME
https://github.com/microhobby/linus-tree/commits/webinar-embarcados

25. DEMO TIME

26. PINCTRL - GENERIC PIN CONFIGURATION
HOUSE OF MOTHER JOAN

27. PINCTRL - GENERIC PIN CONFIGURATION
KEEPING PINCTRL SUBSYSTEM SYNERGY

28. PINCTRL - GENERIC PIN CONFIGURATION
KEEPING PINCTRL SUBSYSTEM SYNERGY

29. PINCTRL - GENERIC PIN CONFIGURATION
EACH VENDOR HAVE YOUR WAY TO APPLY MAPPED DATA

30. PINCTRL - GENERIC PIN CONFIGURATION
EACH VENDOR HAVE YOUR WAY TO APPLY MAPPED DATA

31. PINCTRL - GENERIC PIN CONFIGURATION
KEEPING PINCTRL SUBSYSTEM EASY

32. PINCTRL - GENERIC PIN CONFIGURATION
KEEPING PINCTRL SUBSYSTEM SYNERGY

33. Q&A

34. Obrigado