Difference between revisions of "IoTGateway/Features/Linux/Peripheral"

Revision as of 11:54, 9 August 2016 (view source) Tim.liang (talk | contribs) (→‎CPU Frequency) ← Older edit		Revision as of 05:01, 10 August 2016 (view source) Tim.liang (talk | contribs) (→‎Testing) Newer edit →
Line 22:		Line 22:
	:Command		:Command
	::Test 1		::Test 1
−	:: <code> # candump can1 &</code>	+	:::<code> # candump can1 &</code>
−	:: <code> # cansend can0 12345678#123412341234</code>	+	:::<code> # cansend can0 12345678#123412341234</code>
	:::The following shows the result		:::The following shows the result
	::: <code>  can1  12345678  [6]  12 34 12 34 12 34</code>		::: <code>  can1  12345678  [6]  12 34 12 34 12 34</code>
	::Test 2		::Test 2
−	:: <code>  # cansend can0 133#ababdede</code>	+	:::<code>  # cansend can0 133#ababdede</code>
	:::The following shows the result		:::The following shows the result
	::: <code> can1      133  [4]  AB AB DE DE</code>		::: <code> can1      133  [4]  AB AB DE DE</code>

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Revision as of 05:01, 10 August 2016

ADC

analogue to digital converters

Backlight

Enable/read and modify backlight brightness

Camera

Example

CAN Bus

Prerequisites

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

CPU Frequency

Prerequisites

Testing

Ethernet

Example

Framebuffer

Example

GPIO

Example

I2C

Example

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

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