Linux Peripheral Features

Feature	Description
#ADC	analogue to digital converters
Backlight	Enable/read and modify backlight brightness
Camera	Example
CAN Bus	CAN subsystem
CPU Frequency	Example
Ethernet	Example
Framebuffer	Example
GPIO	Example
I2C	Example
IR	InfraRed
One Wire	Example
RTC	Example
SATA	Example
SD/MMC	Example
SPI	Example
SPWG/JEDIA	Example
UART	Example
USB	Example
Watchdog	Example

ADC

analogue to digital converters

Backlight

Enable/read and modify backlight brightness

Camera

Example

CAN Bus

Testing

Connect can0 and can1

<CAN1_D+> connect to <CAN2_D+>

<CAN1_D-> connect to <CAN2_D->

Configure

# ip link set can0 up type can bitrate 125000

# ip link set can1 up type can bitrate 125000

Command

Test 1

# candump can1 &

# cansend can0 12345678#123412341234

The following shows the result

can1 12345678 [6] 12 34 12 34 12 34

Test 2

# cansend can0 133#ababdede

The following shows the result

can1 133 [4] AB AB DE DE

Ethernet

Example

Framebuffer

Example

GPIO

Example

I2C

Example

IR

To decode the infrared signals and provide an uniform interface

lircd -d /dev/lirc0

used parameters:

-d --device=device    read from given device
-u --uinput           generate Linux input events

Executes commands on an IR signal decoded by lircd,

irexec -d /devlirc0

Note: if show these message after running lircd

lircd: can't open or create /var/run/lirc/lircd.pid
lircd: No such file or directory

It has to add the "/var/run/lirc" folder

mkdir /var/run/lirc

How to debug:

1. To check that signals are decoded correctly

mode2 -d /dev/lirc0

It repeats to show "space" and "pulse" while clicking a control button

space 8451531
pulse 476

2. To check input events.

First, It must add the parameter,"-u", in lircd command

lircd -d /dev/lirc0 -u

It will register at inputX,

input: lircd as /devices/virtual/input/input1 

Run evtest to check events

evtest -d /dev/input/event1

SPWG/JEDIA

Standard Panels Working Group (SPWG)

Japan Electronic Industry Development Association (JEIDA)

How to setting SPWG/JEIDA mode in RISC?

Modify Register GPR(IOMUXC_GPR2)value

Address : 0x020E0008(h)

BIT6 and BIT8 set "0" (SPWG)

BIT6 and BIT8 set "1" (JEIDA)

One Wire

Example

RTC

Example

SATA

Example

SD/MMC

Example

SPI

Example

UART

Example

USB

Example

Watchdog

Example