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

Revision as of 07:36, 11 August 2016 (view source) Tim.liang (talk | contribs) (→‎Testing) ← Older edit		Revision as of 07:45, 11 August 2016 (view source) Tim.liang (talk | contribs) (→‎Testing) Newer edit →
Line 37:		Line 37:
	===Prerequisites===		===Prerequisites===
	===Testing===		===Testing===
−	;Read cpu frequency	+	;Using available CPU frequency policies
		+	Read cpu frequency
	# cpufreq-info  | grep "current CPU frequency"		# cpufreq-info  | grep "current CPU frequency"
	current CPU frequency is 396 MHz (asserted by call to hardware).		current CPU frequency is 396 MHz (asserted by call to hardware).
Line 44:		Line 45:
	current CPU frequency is 396 MHz (asserted by call to hardware).		current CPU frequency is 396 MHz (asserted by call to hardware).
−	;Check available cpu frequency policy	+	Check available CPU frequency policy
	# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors		# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
	conservative ondemand userspace powersave interactive performance		conservative ondemand userspace powersave interactive performance
−	;Change frequency policy	+	Change CPU frequency policy
	# echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor		# echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
−	;Check cpu frequency	+	Check CPU frequency
	# cpufreq-info  | grep "current CPU frequency"		# cpufreq-info  | grep "current CPU frequency"
	current CPU frequency is 996 MHz (asserted by call to hardware).		current CPU frequency is 996 MHz (asserted by call to hardware).
Line 57:		Line 58:
	current CPU frequency is 996 MHz (asserted by call to hardware).		current CPU frequency is 996 MHz (asserted by call to hardware).
	current CPU frequency is 996 MHz (asserted by call to hardware).		current CPU frequency is 996 MHz (asserted by call to hardware).
		+
		+	;Setting the CPU frequency explicitly
		+	Read cpu available CPU frequenies
		+	# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
		+	396000 792000 996000
		+
		+	Change CPU frequency explicitly
		+	# echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
		+	# echo 792000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
		+
		+	Check CPU frequency
		+	# cpufreq-info  | grep "current CPU frequency"
		+	current CPU frequency is 792 MHz (asserted by call to hardware).
		+	current CPU frequency is 792 MHz (asserted by call to hardware).
		+	current CPU frequency is 792 MHz (asserted by call to hardware).
		+	current CPU frequency is 792 MHz (asserted by call to hardware).
	==Ethernet==		==Ethernet==

---

Revision as of 07:45, 11 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

Using available CPU frequency policies

Read cpu frequency

# cpufreq-info  | grep "current CPU frequency"
current CPU frequency is 396 MHz (asserted by call to hardware).
current CPU frequency is 396 MHz (asserted by call to hardware).
current CPU frequency is 396 MHz (asserted by call to hardware).
current CPU frequency is 396 MHz (asserted by call to hardware).

Check available CPU frequency policy

# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
conservative ondemand userspace powersave interactive performance

Change CPU frequency policy

# echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

Check CPU frequency

# cpufreq-info  | grep "current CPU frequency"
current CPU frequency is 996 MHz (asserted by call to hardware).
current CPU frequency is 996 MHz (asserted by call to hardware).
current CPU frequency is 996 MHz (asserted by call to hardware).
current CPU frequency is 996 MHz (asserted by call to hardware).

Setting the CPU frequency explicitly

Read cpu available CPU frequenies

# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
396000 792000 996000

Change CPU frequency explicitly

# echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
# echo 792000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed

Check CPU frequency

# cpufreq-info  | grep "current CPU frequency"
current CPU frequency is 792 MHz (asserted by call to hardware).
current CPU frequency is 792 MHz (asserted by call to hardware).
current CPU frequency is 792 MHz (asserted by call to hardware).
current CPU frequency is 792 MHz (asserted by call to hardware).

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

One Wire

Example

RTC

Example

SATA

Example

SD/MMC

Example

SPI

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)

UART

Example

USB

Example

Watchdog

Example